GB2594069A

GB2594069A - Cargo handling apparatus

Info

Publication number: GB2594069A
Application number: GB2005474.8A
Authority: GB
Inventors: Greig Ross Alexander
Original assignee: R B Ross Steel Fabrications Ltd
Current assignee: R B Ross Steel Fabrications Ltd
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2021-10-20
Anticipated expiration: 2040-04-15
Also published as: GB2594069B; GB202005474D0

Abstract

An apparatus 10 for packing elongate members 20 comprising a frame 11 with side members 12, and a retaining device 22 positioned between the side members comprising a base structure, a first loading mechanism comprising load interfaces 23a 23b on opposing ends of the base operable with a side member 12 to apply a first clamping force to elongate members, and a second loading mechanism 41 intermediate the load interfaces to apply a second clamping force on at least one elongate member. The second loading mechanism 41 may be configurable between retracted and extended positions, it may comprise an actuator that may be manually operated. There may be a pressure plate 25 for applying the second clamping force, that may be disposed centrally. The first clamping force may comprise load interfaces configurable between active and inactive configurations, an upper cross piece 36a 36b may transmit the clamping force. The height of the retaining device 22 may be adjusted, through a plurality of interface structures. The apparatus may be configured to pack lengths of drill pipe. A corresponding method is further disclosed.

Description

CARGO HANDLING APPARATUS

FIELD

The present disclosure relates to a cargo handling apparatus, in particular an apparatus for packing elongate members.

BACKGROUND

Drilling boreholes by rotary drilling usually involves use of a drill string with a drill bit at the distal end and a motor at the rig end. The drill string is conventionally made up of many lengths of drill pipe connected together by threaded box and pin connections.

Prior to drilling, the lengths of drill pipe must be stored in a secure manner before being transported to the drill site. The drill pipes are typically placed under extreme stresses during the drilling process, and thus any material defects in the drill pipes may result in failure of the entire drill string. As such, it is imperative that the structural integrity of the drill pipes is maintained prior to their deployment.

It is known to pack drill pipes and other tubulars in cuboid bundles for storage and transport. The cuboid bundles are required to be held together in such a way to prevent unwanted movement of the drill pipes. However, the drill pipes are not always securely retained within their bundle, and this may cause slippage and damage of the drill pipes, as well as placing the safety of close-by personnel at risk.

SUMMARY

An aspect of the present disclosure relates to an apparatus for packing elongate members, comprising: a frame comprising side members; and a retaining device for retaining elongate members positioned between the side members, the retaining device comprising: a base structure; a first loading mechanism comprising load interfaces on opposing end regions of the base structure, the load interfaces being operable with a respective side member to apply a first clamping force on the elongate members; and a second loading mechanism connected to the base structure intermediate the load interfaces and being operable to apply a second clamping force on at least one of the elongate members.

In use, the elongate members may be positioned between the side members of the frame and the retaining device may be placed on top of and across the elongate members. The load interfaces of the first loading mechanism may be operated with the side members causing the first clamping force to be applied in regions towards either side of the frame. The second loading mechanism may be operated causing the second clamping force to be applied in a region intermediate either side of the frame. The application of clamping forces in this manner may provide for a more reliable, secure and robust packing of elongate members. Furthermore, this arrangement may provide for a more even load application across the packed elongate members which may help to prevent unwanted movement thereof, thus improving safety of close-by personnel and mitigating the risk of damage to the elongate members.

The base structure may be configured to provide a support for the second loading mechanism to react off to apply the second clamping force. The second loading mechanism, or at least a portion thereof, may be integrally formed with and/or connected to the base structure. The second loading mechanism may be removably connected to the base structure. The second loading mechanism may be at least partly contained in the base structure. The base structure may be provided with a window for accessing the second loading mechanism.

The base structure may define an upper surface and a lower surface. The upper surface may be connected to the first loading mechanism, while the lower surface may be configured to apply the first clamping force on the elongate members positioned between the side member of the frame. The base structure may comprise a length that extends from one side member of the frame to the other. Accordingly, the base structure, in use, may straddle across the elongate members positioned between the side members.

The load interfaces of the first loading mechanism may be connected to the upper surface of the base structure. The load interfaces, or at least a portion thereof, may protrude beyond the length of the base structure. The load interfaces may be moveably connected to the base structure. For example, the load interfaces may be rotatably connected to the base structure.

The first loading mechanism and the second loading mechanism may be operated in succession, for example the first loading mechanism may be operated before the second mechanism, or vice versa. Alternatively, the first loading mechanism and the second loading mechanism may be operated simultaneously.

The side members of the frame and the retaining device, in use, together may define a space. The elongate members may be positioned in the space, and as such the space may be defined as a packed-member space. The first clamping force and the second clamping force may act in directions towards the packed-member space. For example, the apparatus may be oriented such that the first and second clamping forces act in a vertical direction towards the packed-member space, such as a downwards vertical direction. In other examples, the apparatus may be oriented such that the first and clamping forces act in a horizontal direction towards the packed-member space. Of course, in other variations the orientation of the apparatus may be such that the clamping force may be applied in any direction.

In use, the base structure may be configured to be urged towards the elongate members by operation of the load interfaces with the frame to apply the first clamping force. The base structure may be subjected to a reaction force as the base structure engages (directly or indirectly) the elongate members. The presence of the first clamping force (applied at opposite sides of the base member) may cause the base structure to be subjected to a bending moment tending to cause the centre of the base structure to flex, with the effect that the first clamping force may not be applied evenly across the length of the base member. To limit this effect, as well as to provide the support for the second loading mechanism, the base structure may be configured to resist longitudinal bending. The base structure may comprise a substantially uniform bar, for example, a cross-sectional l-bar or other shape comprising a sufficiently large second area moment. Further, as described in more detail herein, the presence of the second loading mechanism may function to negate the effect of any bending moment caused by the first loading mechanism.

The second loading mechanism may comprise an extendable member, which may be extendable relative to the base structure. The extendable member may be extended, in use, towards the elongate members positioned between the side members.

The second loading mechanism may be reconfigurable between a retracted configuration, wherein the extendable member is retracted relative to the base structure, and an extended configuration, wherein the extendable member is extended relative to the base structure. The second clamping force may be applied on the at least one elongate member by reconfiguring the second loading mechanism from the retracted configuration to the extended configuration.

The extension of the extendable member may provide for the second clamping force to be applied on the at least one elongate member. In this respect, a greater extension of the extendable member may result in a greater second clamping force on the at least one elongate member.

The second loading mechanism may comprise an actuator for reconfiguring the second loading mechanism between the retracted and extended configurations. The actuator may be directly and operatively connected to the extendable member. The actuator may be manually operated. The extendable member may be extendable by relative rotation with respect to the actuator. The actuator may comprise a rotatable structure, which may be configured such that rotation thereof causes linear movement of the extendable member. Alternatively, the actuator may be automatic and may be provided with a power supply. In this regard, the actuator may be remotely controlled through a wired or wireless connection. For example, the actuator may be hydraulic or pneumatic.

The extendable member may be configured exclusively for linear movement with respect to the base structure, i.e. the extendable member may be rotationally locked with respect to the base structure. Alternatively, the extendable member may be configured such that rotation thereof induces linear movement of the extendable member.

The actuator may comprise a nut configured to cooperate with the extendable member.

The extendable member may comprise a rod which is operatively connected to the nut. The rod and nut may comprise corresponding threads. The nut may be fixed to the base structure such that rotation of the nut is permitted. The nut may be arranged concentrically with the extendable member.

The extendable member may be configured to cooperate with an anti-rotation sleeve. The anti-rotation sleeve may be rotationally fixed relative to the base structure. The anti-rotation sleeve may have an inner surface comprising a slot or recess. The slot or recess may extend linearly from one end of the sleeve to the other. The slot or recess may be configured to cooperate with a locking key of the extendable member. The locking key may comprise a projecting pin. The extendable member may be connected to a disc comprising the locking key. The locking key, in combination with the anti-rotation sleeve, may be configured for preventing rotation of the extendable member.

The actuator may comprise a turning wheel. The turning wheel may be rotationally connected to the nut. The turning wheel may be directly connected to the extendable member. The turning wheel may comprise an outer profile for assisting with turning of the nut. The turning wheel may comprise a series of through bores arranged around the circumference of the turning wheel. For example, the through bores may allow for a bar or rod to be inserted therein and used as a lever arm for rotating the turning wheel.

The turning wheel may include a series of radially extending shoulders around the circumference of the turning wheel, which may correspond to the number of through-bores. This may further assist with rotation of the turning wheel, as the lever arm may engage the radial shoulders of the nut, as well as the inner surfaces of the through-bores, when rotating the turning wheel.

In use, the second clamping force may be applied on the elongate members by rotating the turning wheel, causing the locking key of the extendable member to engage the slot or recess and induce linear movement of the extendable member. Accordingly, rotation of the turning wheel may be controlled to vary the distance by which the extendable member is extended relative to the base structure and thus the magnitude of the second clamping force applied on the at least one elongate member.

The extendable member may be configured to extend through an opening of the base structure. The opening may be provided on an underside of the base structure. The opening may be provided on a upper surface of the base structure.

The extendable member may comprise a pressure plate for applying the second clamping force. The extendable member may be connected to the pressure plate at an end region thereof. The pressure plate may comprise a planar surface. The planar surface may be configured to apply the second clamping force on the at least one elongate member. The planar surface may extend outwards from and around sides of the extendable member. The pressure plate may provide for a more distributed application of the second clamping force.

The extendable member and/or pressure plate may comprise a material configured to deform under application of the first and/or second clamping forces. The material may be configured to return to its original configuration subsequent to removal of the first and/or second clamping forces. Accordingly, the material may be selected to comprise sufficient resiliency and deformability. The material may comprise a sufficiently high coefficient of friction to assist with reducing relative movement of the elongate members. The coefficient of friction may be determined in accordance with the magnitudes of the first and second clamping forces. The material may be provided as a cover, for example to cover surfaces of the second loading mechanism susceptible of contact with the elongate members. For example, the cover may be provided on the planar surface of the pressure plate and/or the end region of the extendable member. Such material may assist with gripping the elongate members, in use, to hold them securely in position.

The apparatus may comprise a single second loading mechanism. The second loading mechanism may be disposed centrally between the load interfaces.

Alternatively, the apparatus may comprise a plurality of second loading mechanisms. The plurality of second loading mechanisms may be spaced across the length of the base structure. The plurality of second loading mechanisms may be spaced equally across the length of the base structure. The plurality of second loading mechanisms may be spaced unequally across the length of the base structure. The spacing of the elongate members may be determined in accordance with the application of the apparatus. For example, there may be more second loading mechanisms provided at one side of the apparatus than the other, for example to provide for a particular load distribution across the elongate members. The number of second loading mechanisms may relate to the number of elongate members required to be packed. The plurality of elongate members may be such that a second clamping force may be applied individually on each of the elongate members.

The first clamping force, in use, may be established by a first load and a second load. The first load may be applied in a region towards one of the side members of the frame. The second load may be applied in a region towards the other of the side members. The second clamping force, in use, may be established by a third load. The third load may be applied in a region intermediate the side members.

The load interfaces may be reconfigurable between an inactive configuration, wherein the first clamping force is not applied, and an active configuration, wherein the first clamping force is applied.

In the inactive configuration, the load interfaces may be disengaged from the side members of the frame. However, the skilled person will appreciate that the load interfaces may be in contact with the side members of the frame but nevertheless not apply the first clamping force on the elongate members, or at most apply a negligible force on the elongate members. The load interfaces may be provided with a biasing mechanism configured to bias the load interfaces towards the side members of the frame when in the inactive configuration. The biasing mechanism may be configured such that the load interfaces apply a negligible load on the elongate members when in the inactive configuration.

In the active configuration, the load interfaces may operate with the side members of the frame to apply the first clamping force on the elongate members. Furthermore, in the active configuration, the load interfaces, side members and base structure may together provide the support for the second loading mechanism to react off to apply the second clamping force.

The first loading mechanism may comprise a control mechanism for reconfiguring the load interfaces between the inactive and active configurations. The control mechanism may be operatively connected to the load interfaces. The control mechanism may be connected to the base structure, for example, in a central position on the base structure or towards an end region thereof. The control mechanism may define a symmetrical arrangement.

The control mechanism may be manually operated. The control mechanism may be configured for linear operation. The control mechanism may be configured for rotary operation. The control mechanism may comprise a transmission system. The transmission system may be configured to translate linear movement into rotary movement. The transmission system may be configured to translate rotary movement to linear movement. The control mechanism may comprise a drive system. The drive system may be operatively connected to the load interfaces. For example, the control mechanism may comprise a ratchet-turnbuckle arrangement.

The control mechanism may comprise a sleeve rotatably connected to the base structure and operable with a lever handle. The sleeve may comprise an internal thread configured to receive a threaded rod in either end. The rods may be arranged relative to the sleeve such that their threads travel in opposite directions. The threaded rods may be connected to the load interfaces. Such connection may be direct or via a bar and/or chain. The rods may be rotationally fixed relative to the base structure, such that rotation of the sleeve in one direction may cause the rods to be drawn into the sleeve and rotation of the sleeve in the other direction may cause the rods to be pushed out of the sleeve.

Alternatively, the control mechanism may be automatic. The control mechanism may be provided with a power supply. The control mechanism may be remotely controlled through a wired or wireless connection. For example, the control mechanism may be hydraulically or pneumatically powered.

The apparatus may comprise a plurality of control mechanisms. For example, the apparatus may comprise an individual control mechanism for controlling each of the load interfaces independently.

Alternatively, the apparatus may comprise a single control mechanism configured to control operation of each of the load interfaces together. The control mechanism may be configured to control operation of the load interfaces simultaneously. This may encourage the load interfaces to engage the side members of the frame equally, such that the likelihood of an uneven load across the elongate members is reduced.

The load interfaces may each comprise a hook structure. The hook structures may be configured to cooperate with interface structures formed on the side members of the frame. The interface structures may comprise a pin, recess or protrusion formed on a surface of the side members, for example an inside surface of the side members. The hook structures may incorporate pins that enable the hook structures to be rotated thereabout. Rotation of the hook structures may be controlled by operation of the control mechanism The apparatus may be required to pack one or more rows of elongate members between the side members of the frame. The apparatus may comprise at least one crosspiece for positioning between the rows of elongate members. The at least one crosspiece may be configured to transmit the first and/or second clamping forces onto the elongate members. The at least one crosspiece may extend between the side members of the frame, such that each elongate member may be supported by a crosspiece.

The at least one crosspiece may comprise a fixing member at either side configured to cooperate with the side members of the frame. The fixing member may comprise any suitable means permitting the at least one crosspiece to be moved relative to the height of the side members. For example, the fixing member may permit the at least one crosspiece to be slid in and out of the side members. The fixing member may comprise a mechanical or magnetic fixing means. The fixing member may comprise a projection configured to cooperate with a slot or recess formed on the side members.

The at least one crosspiece may be of any shape. For example, the at least one crosspiece may comprise a shape having a rectangular cross section. Alternatively, the at least one crosspiece may comprise a shape or cross section specifically designed to enhance gripping of the elongate members.

The at least one crosspiece may comprise a material configured to deform under application of the first and/or second clamping forces. The material may be configured to return to its original configuration subsequent to removal of the first and/or second clamping forces. Accordingly, the material may be selected to comprise a sufficient resiliency and deformability. The material may comprise a sufficiently high coefficient of friction to assist with reducing relative movement of the elongate members. The coefficient of friction required may be determined in accordance with the magnitude of the first and second clamping forces. The material may be provided as a cover, for example to cover surfaces of the at least one crosspiece susceptible of contact with the elongate members. For example, the at least one crosspiece may be provided with a cover on opposing surfaces intended to engage the elongate members positioned above and below. Such material may assist with gripping the elongate members, in use, to hold them securely in position.

An upper crosspiece may be provided for positioning between the elongate members and the retaining device. The upper crosspiece may be configured for placing across the top row of elongate members. The upper crosspiece may be configured such that the retaining device may be placed on top of the upper crosspiece. The upper crosspiece may be configured to transmit the first and/or second clamping forces onto the elongate members. The upper crosspiece may be configured to be engaged by (the lower surface of) the base structure. The upper crosspiece may be configured to be engaged by the extendable member of the second loading mechanism. The upper crosspiece may be configured to be engaged by the pressure plate, where provided, of the extendable member.

The upper crosspiece may comprise a material in accordance with the description above relating to the material of the at least one crosspiece. For example, the upper crosspiece may be provided with a cover of such material on a lower surface thereof An upper surface of the upper crosspiece may be free from any such cover, since the upper surface may not be intended to engage any elongate members.

The upper crosspiece may comprise a length configured to extend between the side members of the frame. The upper crosspiece may comprise a first longitudinal section and a second longitudinal section. The first longitudinal section may be configured for engagement with the retaining device. The second longitudinal section may be configured for engagement with the elongate members. The second longitudinal section may comprise a material in accordance with the description above relating to the material of the at least one crosspiece, for engaging the elongate members.

In use, the first longitudinal section may be connected to the second longitudinal section. The first and second longitudinal sections may be arranged in parallel with one another, each extending between the side members of the frame. The first longitudinal section may comprise a profiled surface to engage the second longitudinal section so as to permit the first longitudinal section to be connected thereto. Alternatively, the first longitudinal section may be connected to the second longitudinal section by other fixing means, for example bolting, welding, adhesion, etc. The first longitudinal section may be articulated. The first longitudinal section may comprise a central portion and two side portions. The central portion may be interposed between the two side portions. The central portion may be removably connected to the side portions. The central portion may be rotatably connected to the side portions. For example, the central portion may be connected to the side portions via a pin connection. The central portion and side portions may together define the length of the upper crosspiece. The central portion may comprise a material which is different to a material of the side portions.

In use, the upper crosspiece may be provided in an initial, first configuration, wherein the central portion and side portions may be aligned and share a common axis. For example, this might be the case prior to operation of the retaining device to apply the first and second clamping forces.

The first loading mechanism may be operated to apply the first clamping force on the first longitudinal section. As noted above, the first clamping force may be established by first and second loads applied towards either side member of the frame.

Accordingly, the side portions of the first longitudinal section may be subjected to a greater force than the central portion. This may result in a small amount of relative rotation between the central portion and side portions. This may cause the upper crosspiece to move to a second configuration, wherein the central portion and side portions may be angled relative to each other, and therefore may not share a common axis. The side portions may be configured to transmit the first clamping force onto the second longitudinal section, which in use may be positioned between the first longitudinal section and the elongate members. The second longitudinal section may be configured to transmit the first clamping force onto the elongate members.

The second loading mechanism may be operated to apply the second clamping force on the first longitudinal section, for example the central portion of the first longitudinal section. This may result in a small amount of relative rotation between the central portion and side portions. This may cause the upper crosspiece to move to a third configuration, wherein the angle between the central portion and side portions is less than that in the second configuration. For example, the central portion and side portions may be aligned and share a common axis. The central portion may be configured to transmit the second clamping force onto the second longitudinal section. The second longitudinal section may be configured to transmit the second clamping force onto the elongate members.

This arrangement of upper crosspiece may assist with balancing the load distribution across the elongate members The central portion and/or the side portions may comprise a width. The central portion and/or side portions may comprise side walls. The side walls may run along either side of the width of the central portion and/or the side portions. The side walls may define respective channels in the central portion and/or side portions. The channels may extend across a length of the central portion and/or side portions. The channels may comprise a width greater than a width of the base structure of the retaining device. The channels may comprise a width sufficient to receive the base structure therein.

The central portion and/or the side portions may each comprise at least one raised surface. The raised surfaces may be configured to engage (the lower surface of) the base structure. The raised surfaces may protrude from an upper surface of the channels. The raised surfaces may comprise a ridge. The ridge may be arranged to run transverse to the length of the upper crosspiece. The ridge may connect at either end with the side walls of the central portion and/or the side portions.

The raised surfaces may comprise a height that is less than a height of the side walls.

In use, the base structure may be partly contained within the longitudinal channels such that the height of the side walls extends beyond the lower surface of the base structure. This may assist with reducing relative movement of the retaining device and the upper crosspiece.

The raised surfaces may be configured for receiving the first clamping force. The raised surfaces may be configured to transmit the first clamping force. The raised surfaces may be integrally formed with the central portion and/or side portions. Alternatively, the raised surfaces may be connected to the central portion and/or side portions. The central portion and/or side portions may comprise a series of raised surfaces. The series of raised surfaces may be spaced along the length of the first longitudinal section. The series of raised surfaces may be spaced equally along the length of the first longitudinal section. The series of raised surfaces may be spaced unequally along the length of the first longitudinal section.

The raised surfaces may comprise a material suitable for transmitting loads. The material may be configured to deform under application of the first clamping force. The material may be configured to return to its original configuration subsequent to removal of the first clamping force. Accordingly, the material may be selected to comprise sufficient resiliency and deformability.

The central portion may be configured to be engaged by the second loading mechanism, for example the extendable member or, where provided, the pressure plate. The central portion may comprise an anvil or loading surface. The loading surface may be configured to receive the second loading mechanism. The loading surface may be interposed between two raised surfaces provided on the central portion. The loading surface may be disposed centrally on the central portion. The loading surface may comprise a material having sufficient durability to withstand the cyclic loading associated with the application of the second clamping force.

The side portions may comprise a fixing member configured to cooperate with the side members of the frame. The fixing member may comprise any suitable means permitting the upper crosspiece to be moved relative to the height of the side members. For example, the fixing member may permit the upper crosspiece to be slid in and out of the side members. The fixing member may comprise a mechanical or magnetic fixing means. The fixing member may comprise a projection configured to cooperate with a slot or recess formed on the side members.

The frame may comprise a U-shaped frame. For example, the side members may be or comprise the upright side portions of the U-shaped frame. The frame may comprise a substructure. The substructure may comprise at least one lateral support beam and at least one longitudinal support beam. The longitudinal support beam may comprise a length permitting the elongate members to be supported at predetermined locations along their length. The predetermined locations may be selected to be equidistant from a centre of the elongate members and sufficiently far apart to provide for stability of the apparatus. The side members of the frame may be connected to the substructure, extending upwards therefrom.

The frame may comprise a series of U-shaped frames. The U-shaped frames may be spaced apart so as to support the elongate members at a number of locations along their axial length. The series of U-shaped frames may be connected to the at least one longitudinal beam member of the substructure. The distance of the spacing between each of the U-shaped frames may be the same or different. For example, where the apparatus may be required to pack elongate members having an offset centre of mass, it may be preferred to arrange the series of U-shaped frame members so as to provide more support at one side of the elongate members than the other.

Where a series of U-shaped frames are provided, each frame may comprise a respective retaining device in accordance with description above.

The retaining device may be height adjustable with the side members. This may provide for the apparatus to be capable of effectively packing any number of elongate members required by the application. For example, the load interfaces of the first loading mechanism may be operable with the side members, and thus capable of applying the first and second clamping forces, at various heights or positions relative to the side members. The side members may comprise a plurality of interface structures, for example protrusions, arranged such that the retaining device may be operable at various heights or positions relative to the side members.

The apparatus may be configured to pack lengths of drill pipe suitable for use in drilling an oil-and-gas wellbore. For example, the apparatus may be sized accordingly to pack sections of drill pipe having a length in the range of 5.49 to 13.72 meters (18 to 45 feet) and an outer diameter in the range of 8.64 to 21.59 centimetres (3.4 to 8.5 inches). However, the apparatus may be of any size; in particular, the size of the apparatus may be determined in accordance with the size of the elongate members to be packed.

Another aspect of the present disclosure relates to a method for packing elongate members, the method comprising: positioning elongate members between side members of a frame; positioning above the elongate members a retaining device comprising: a base structure a first loading mechanism connected to the base structure and comprising load interfaces on opposing end regions thereof, the load interfaces being operable with a respective side member to apply a first clamping force on the elongate members; and a second loading mechanism connected to the base structure intermediate the load interfaces and being operable to apply a second clamping force on at least one of the elongate members; operating the first loading mechanism to apply the first clamping force on the elongate members; and operating the second loading mechanism to apply the second clamping force on at least one of the elongate members.

Operating the load interfaces may comprise reconfiguring the load interfaces between an inactive configuration, wherein the first clamping force is not applied, and an active configuration, wherein the first clamping force is applied.

Reconfiguring the load interfaces between the inactive and active configurations may comprise operating a control mechanism to engage the load interfaces with the side members of the frame, wherein the first clamping force may be applied on the elongate members.

Operating the load interfaces may involve operating a ratchet-turnbuckle arrangement of the control mechanism operatively connected to the load interfaces. This may involve rotating a sleeve of the ratchet-turnbuckle arrangement causing rods to be drawn into the sleeve, and hook structures, connected to the rods, to pivot about respective pins. Consequently, the hook structures may engage interface structures of the side members, urging the base structure downwards to apply the first clamping force on the elongate members.

Operating the second loading mechanism may comprise reconfiguring the second loading mechanism between a retracted configuration, wherein an extendable member of the second loading mechanism is retracted relative to the base structure, and an extended configuration, wherein the extendable member is extended relative to the base structure.

Reconfiguring the second loading mechanism between the retracted and extended configurations may comprise extending the extendable member using an actuator. The actuator may be manually operated. For example, the actuator may be configured to actuate linear movement of the extendable member. Alternatively, the actuator may be automatic.

The method may comprise rotatably locking the extendable member, wherein the extendable member may be configured for linear movement.

The method may comprise applying the second clamping force on the at least one elongate member by extending the extendable member relative to the base structure. A greater extension of the extendable member may result in a greater clamping force on the at least one elongate member.

The method may comprise varying the distance by which the extendable member is extended to vary the clamping force applied on the at least one elongate member. For example, the method may comprise controlling the rotation of a turning wheel operatively connected to the extendable member to control the extension thereof.

The method may comprise providing the second loading mechanism with a pressure plate, wherein the application of the second clamping force on the at least one elongate member may be applied via the pressure plate. The pressure plate may assist with distributing the second clamping force applied on the at least one elongate member.

The method may comprise applying the first clamping force comprising a first load and a second load, wherein the first load may be applied in a region towards one of the side members of the frame and the second load may be applied in a region towards the other of the side members.

The method may comprise applying the second clamping force comprising a third load, wherein the third load may be applied in a region intermediate the side members.

15 20 25 30 The method may comprise packing a plurality of rows of elongate members between the side members of the frame. The method may comprise providing a crosspiece between each row of elongate members.

The method may comprise providing an upper crosspiece for positioning between the elongate members and the retaining device.

The method may comprise providing the crosspiece(s) and the upper crosspiece comprising a material configured to deform under application of the first and/or second clamping forces. The method may comprise selecting a material comprising a sufficient resiliency, deformability and coefficient of friction. The method may comprise deforming the material under application of the first and/or second clamping forces. Such deformation may assist with gripping the elongate members to hold them securely in position.

The retaining device of the above-described method may be or comprise a retaining device according to any of the above or below described aspects. Furthermore, the frame of the above-described method may be or comprise a frame according to any of the above or below described aspects. In respect of any of the above or below described aspects, the elongate members may be lengths of drill pipe or other tubulars.

An alternative retaining device may comprise an upper bar that extends above and across the base structure. The upper bar may be connected to one or more of the side members of the frame, and extend therefrom above and across the base structure. The extendable member of the load-distributing may be configured to extend in a direction away from the elongate members and towards the upper bar. The extendable member may be configured to extend into abutment with (a lower surface of) the upper bar. The upper bar may be configured to provide a support for the extendable member to react off. In this regard, the upper bar may be configured to resist longitudinal bending and may therefore comprise a cross-sectional I-bar or other shape comprising a large second area moment.

The retaining device may comprise a base structure having a lower surface configured to act as a pressure plate for applying the second clamping force on the at least one elongate member. As such, the base structure may be configured to apply both the first clamping force and the second clamping force. The lower surface of the base structure may comprise a deformable, resilient material for engaging the elongate members. The material may comprise a sufficiently high coefficient of friction to assist with gripping the elongate members in place The second clamping force may be applied by operating the second loading mechanism causing the extendable member to extend into abutment with the upper bar. This may create a reaction force urging the lower surface of the base structure towards the elongate members to transmit the second clamping force thereon. The second clamping force may assist with balancing the load distribution across the elongate members between the side members of the frame.

Another aspect of the present disclosure relates to a retaining device for retaining elongate members positioned between side members of a frame, the retaining device comprising: a base structure; a first loading mechanism connected to the base structure and comprising load interfaces on opposing end regions thereof, the load interfaces being configured to operate with a respective side member to apply a first clamping force on the elongate members; and a second loading mechanism connected to the base structure intermediate the load interfaces and being operable to apply a second clamping force on at least one of the elongate members.

It will be appreciated that the features defined in relation to one aspect may be applied in combination with any other aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects of the present disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 illustrates an end view of an apparatus for packing elongate members in accordance with an embodiment of the present disclosure; Figure 2 illustrates a side view of the apparatus of Figure 1; Figure 3 illustrates a top view of the apparatus of Figure 1; Figure 4 illustrates a front view of a retaining device in accordance with the present disclosure; Figure 5 illustrates a bottom view of the retaining device of Figure 4; Figure 6 illustrates a partial front view of the retaining device of Figure 4; Figure 7 illustrates an exploded isometric view of the retaining device of Figure 4; Figure 8 is an exploded isometric view of an upper crosspiece in accordance with the present disclosure; Figure 9 is a top view of the upper crosspiece of Figure 8; Figure 10 illustrates the retaining device of Figure 4 in use in a first stage of operation; Figure 11 is an illustrative force-vector diagram indicating a load distribution associated with Figure 10; Figure 12 illustrates the retaining device of Figure 4 in use in a second stage of operation, Figure 13 is an illustrative force-vector diagram indicating a load distribution associated with Figure 12; Figure 14 is a front view of an alternative retaining device in accordance with the present disclosure; and Figure 15 is a front view of a further alternative retaining device in accordance with the present disclosure.

DETAILED DESCRIPTION

The present disclosure relates to an apparatus that may be used in a variety of applications. In the description that follows, example forms of the apparatus are presented without any intended restriction on a specific application or use, although some examples of potential operations that could be performed using the apparatus will be suggested, and one specific example use of the apparatus will be provided.

An illustration of the apparatus, which is generally identified by reference numeral 10, is shown in Figure 1, where the apparatus 10 is packing a group of elongate members 20. The apparatus 10 may be used in a wide range of applications, however this example shows the apparatus 10 packing a group of pipes or tubulars 20, which may be used to form a drill string for use in drilling a well, for example an oil-and-gas well.

Therefore, in this case the apparatus 10 has been sized accordingly to pack tubulars having a length in the range of 5.49 to 13.72 meters (18 to 45 feet) and an outer diameter in the range of 8.64 to 21.59 centimetres (3.4 to 8.5 inches). However, the apparatus 10 may be of any size; in particular, the size of the apparatus 10 may be determined in accordance with the size of the elongate members 20 to be packed.

Figure 1 illustrates an end view of the apparatus 10. The apparatus 10 includes a pair of U-shaped frames 11 comprising two upright side members 12 connected by a lateral support beam 14. The apparatus 10 includes a plurality of horizontally extending crosspieces 18a, each extending between the side members 12 of the frames 11. The apparatus 10 further includes an upper crosspiece 18b configured for engagement with a retaining device 22 (discussed in more detail below). In other examples, however, the apparatus 10 may be required to pack only a single row of tubulars 20 and therefore a crosspiece 18a may not be required.

Figure 2 shows a side view of the apparatus 10. As shown, the pair of frames 11 are connected by a longitudinal support beam 16 having a length permitting the tubulars 20 to be supported at predetermined locations along their length. In this example, the length of the longitudinal support beam 16 and the position of the tubulars 20 are such that the tubulars 20 are supported at locations equidistant from their centre and sufficiently far apart to provide for stability of the apparatus 10.

In use, the first row of tubulars 20 is positioned between the side members 12 of the frame 11. A crosspiece 18a is placed on top of the first row and connected to the side members 12 via fixing members (not shown), and further rows of tubulars 20 may be built up with crosspieces 18a interposed between each row such that each of the tubulars 20 is supported by a crosspiece 18a. Once the required number of tubulars 20 have been positioned between the side members 12, the upper crosspiece 18b is placed on top of the upper row of tubulars 20. The retaining device 22 may then be installed with the side members 12 in a position on top of the upper crosspiece 18b.

The retaining device 22 may be operated to apply a clamping force on the tubulars 20 and crosspieces 18a, 18b, urging them together and securing them in place. The crosspieces 18a,18b include a deformable, resilient material configured to deform under application of a clamping force. The material also has a sufficiently high coefficient of friction to assist with reducing relative movement of the tubulars 20 and crosspieces 18a, 18b. As shown in Figure 3, each of the frame members 11 is provided with a retaining device 22 to provide a respective clamping force on the tubulars 20 at each frame 11 location.

Figures 4 and 5 illustrate front and bottom views of the retaining device 22, respectively. The retaining device 22 comprises a first loading mechanism 21 having load interfaces 23a, 23b connected to the base structure 25 on opposing end regions thereof. The load interfaces 23a, 23b are operable with the side members 12 of the frame 11 to apply a first clamping force on the tubulars 20 and crosspieces 18a,18b. The first clamping force is applied by the base structure 25 pressing down on the upper crosspiece 18b, which transmits the clamping force onto the tubulars 20 and crosspieces 18a below. The first loading mechanism 21 includes a control mechanism 26 for reconfiguring the load interfaces 23a, 23b between an inactive configuration, wherein the first clamping force is not applied, and an active configuration, wherein the first clamping force is applied.

The control mechanism 26 comprises a ratchet-turnbuckle arrangement, wherein a sleeve 38 is configured to receive two threaded rods 34a, 34b, one in either end. The sleeve 38 is rotatably mounted by means of lugs and rings 40 on the base structure 25, and the rods 34a, 34b are arranged relative to the sleeve 38 such that their threads travel in opposite directions. As such, rotation of the sleeve 38 in one direction causes the rods 34a, 34b to be drawn into the sleeve 38 and rotation of the sleeve in the other direction causes the rods 34a, 34b to be pushed out of the sleeve 38. In other examples, however, the control mechanism 26 may instead be provided as automatic. The load interfaces 23a, 23b include hook structures 28a, 28b operatively connected to the control mechanism 26 via the rods 34a, 34b. The hook structures 28a, 28b are rotatably connected to the base structure 25 and are operable with the side members 12.

The first clamping force includes a first load applied in a region towards one of the side members 12 and a second load applied in a region towards the other of the side members 12. The retaining device 22 further comprises a second loading mechanism 41 intermediate the load interfaces 23a, 23b and operable to apply a second clamping force. The second loading mechanism 41 comprises an extendable member 60 that is extendable relative to the base structure 25 and configured to apply the second clamping force on at least one tubular 20 or, where provided, an upper crosspiece 18b.

The second loading mechanism 41 is connected to the base structure 25 so that it may provide a support for the second loading mechanism 41 to react off as the extendable member 60 applies the second clamping force.

The second loading mechanism 41 is disposed centrally between the load interfaces 23a, 23b, and therefore the position of the second loading mechanism 41 provides for the second clamping force to be applied in a region intermediate the side members 12. The application of clamping forces in this manner, i.e. a first clamping force towards either side member and an intermediate second clamping force, may provide for a more reliable, secure and robust packing of the tubulars 20. Furthermore, this arrangement may provide for a more even load application across the tubulars 20 which may help to prevent unwanted movement thereof, thus increasing safety of close-by personnel and mitigating the risk of damage to the tubulars 20.

Figure 6 illustrates a partial front view of the retraining device 22. In use, the hook structure 28b engages an interface structure 44 formed on the side member 12 of the frame 11. Although not shown in Figure 6, the hook structure 28a on the opposing side of the base structure 25 simultaneously engages another interface structure 44 formed on the other side member 12. The side members 12 include a series of interface structures 44 permitting the retaining device 22 to be connected with the side members 12 at various heights or positions. As such, the retaining device 10 may be height adjustable with the frame 11 and thus configured to pack any number of tubulars 12.

As noted above, the control mechanism 42 is configured to draw the rods 34a, 34b into the sleeve 38, increasing tension on bars 36a, 36b connected to the hook structures 28a, 28b. As illustrated in Figure 6, the increased tension causes the hook structure 28b to be pulled in the direction of arrowhead 46, thereby causing the hook structure 28b to pivot about pin 30b. The hook structure 28b is thus urged against the interface structure 44 of the side member 12, which in turn urges the base structure 25 in the direction of the tubulars 20 and crosspieces 18a,18b below to apply the first clamping force thereon.

The sleeve 38 and rods 34a, 34b define a symmetrical arrangement whereby rotation of the sleeve 38 causes the rods 34a, 34b to be drawn into the sleeve 38 by the same distance. As such, this may help to ensure that the hooks 28a, 28b engage equally the interface structures 44 on the side members 12. This may assist with reducing the likelihood of an uneven load across the tubulars 20.

Referring to Figure 7, there is shown an exploded isometric view of the retaining device 22. As noted above, the retaining device 22 includes a second loading mechanism 41 comprising an extendable member 60. In this example, the extendable member 60 is a threaded rod and is arranged to extend through an opening on an underside of the base structure 25. In use, the extendable member 60 is operatively connected to a nut 64 positioned within the base structure 25 having its central axis coincident with that of the opening. The nut 64 is further positioned within a turning wheel 65 having through-bores 65a configured to receive a turning rod 67a having a handle 67b, which may assist with turning of the nut 64. The turning wheel 65 may be accessed via a window 69 provided on the base structure 25. Furthermore, a bracket 63a and washer 63b are used to assist with supporting and turning of the nut 64 and turning wheel 65 within the base structure 25.

The extendable member 60 includes two holes on its upper surface 66 for receiving a pair of pins or screws 68 used to attach a disc 70 to the extendable member 60. The disc 70 includes a locking key or projecting pin 72 configured to connect with a corresponding slot or recess (not shown) provided on an inside surface of a sleeve 74 fixed relative to the base structure 25. The locking key 72 functions together with the sleeve 74 to prevent the extendable member 60 from rotating relative to the base structure 25, as such the sleeve 74 may be defined as an anti-rotation sleeve. This may allow for the nut 64 to be rotated relative to the extendable member 60 causing the extendable member 60 to move linearly up and down, thus permitting the second loading mechanism 41 to move between a retracted configuration and an extended configuration.

The extendable member 60 is connected at a lower end to a pressure plate 76 configured to apply the second clamping force. The amount of clamping force applied is controlled by rotating the turning wheel 65 to vary the distance by which the extendable member 60 is extended relative to the base structure 25. As such, a greater extension of the extendable member 60 results in a greater clamping force applied on the tubulars 20 and crosspieces 18a,18b.

Figures 8 and 9 show an exploded isometric view and a top view of the upper crosspiece 18b, respectively. The upper crosspiece 18b includes a first longitudinal section 78 and a second longitudinal section 80. The first longitudinal section 78 includes a profiled surface 82 permitting the first longitudinal section 78 to be connected to the second longitudinal section 80 such that their lengths are arranged parallel to one another. However, the first and second longitudinal sections 78,80 may be connected by other fixing means, for example bolting, adhesion, etc. The first longitudinal section 78 is articulated and comprises a central portion 84b and two side portions 84a, 84c. The central portion 84b is rotatably connected to the side portions 84a, 84c via a pin connection. The central portion 84b and the side portions 84a, 84c include a series of raised surfaces 86a, 86b, 86c configured for engagement with (the lower surface of) the base structure 25. The raised surfaces 86a,86b,86c include ridges oriented transverse to a length of the upper crosspiece 18b, and include a deformable, resilient material configured to deform under application of a clamping force.

The central portion 84b and side portions 84a, 84c include side walls 88a, 88b, 88c which run along either side of a width of the central portion and side portions 84a, 84b, 84c. The side walls 88a, 88b, 88c define respective channels 90a, 90b, 90c in the central portion 84h and side portions 84a, 84c. The channels 90a, 90b, 90c have a width greater than a width of the base structure 25 so that in use the base structure 25 may be received in the channels 90a, 90b, 90c. Furthermore, the side walls 88a, 88b, 88c have a height greater than a height of the raised surfaces 86a, 86b, 86c.

Therefore, in use the height of the side walls 88a,88b,88c extends beyond the lower surface of the base structure 25, which partly contains the base structure 25 within the channels 90a, 90b, 90c. This may assist with reducing relative movement of the retaining device 21 and the upper crosspiece 18b.

The central portion 84b comprises an anvil or loading surface 92 configured to be engaged by the extendable member 60 of the second loading mechanism 41. The loading surface 92 is disposed centrally on the second portion 84b, between two raised surfaces 86b. The loading surface 92 comprises a material selected to have sufficient durability to withstand the cyclic loading associated with the application of the second clamping force. Furthermore, the side portions 84a, 84c are provided with fixing members 94a, 94c to connect the upper crosspiece 18b to the side members 12 of the frame 11. The fixing members 94a, 94b permit the upper crosspiece 18b to be slid in and out of the frame 11, which may assist with assembling the apparatus 10.

In use, prior to application of the first and second clamping forces, the upper crosspiece 18b may be provided in an initial, first configuration, wherein the central portion 84b and side portions 84a,84c are aligned. Upon application of the first clamping force, the side portions 84a,84b may be subjected to a greater force than the central portion 84b. Therefore, a small amount of relative rotation may occur between the central portion 84b and side portions 84a,84c. This may cause the upper crosspiece 18b to move to a second configuration, wherein the central portion 84b and side portions 84a,84c may be angled relative to each other. Upon application of the second clamping force, the force acting on the central portion 84c may be increased. Therefore, another small amount of relative rotation may occur between the central portion 84b and side portions 84a,84c. This may cause the upper crosspiece 18b to move to a third configuration, wherein the angle between the central portion 84b and side portions 84a,84c may be less than that in the second configuration. This arrangement of upper crosspiece 18b may assist with balancing the load distribution across the elongate members.

Referring to Figure 8, there is shown a side view of the retaining device 22 (not to scale) in use. Beneath the retaining device 22 is an upper crosspiece 18b and a crosspiece 18a arranged with a row of tubulars 20 therebetween (the side members 12 of the frame 11 have been omitted from Figure 8 for clarity). While only one row of tubulars 20 and one crosspiece 18a is shown in Figure 8, in practice there may be any number of rows and crosspieces arranged below the retaining device 22. For the purpose of this illustration, the retaining device 22 is shown as being spaced apart from the upper crosspiece 18b; however, in practice the retaining device 22 would be in contact with the central portion 84b and side portions 84a, 84c of the first longitudinal section 78 of the upper crosspiece 18b.

As noted above, once the required number of tubulars 20 have been assembled, the retaining device 22 is operated to urge and clamp the layers of tubulars 20 and crosspieces 18a, 18b together. Figure 8 illustrates the first loading mechanism 21 in operation where the first clamping force is applied, which includes first and second loads 94a, 94b applied in regions towards either side member 12 of the frame 11. The first clamping force urges the base structure 25 down against the raised surfaces 86a, 86b, 86c of the upper crosspiece 18b which then transmits the clamping force onto the tubulars 20 (as illustrated by arrows 81) resulting in the deformable, resilient material of the crosspiece 18a and upper crosspiece 18b deforming and securing the tubulars 20 in place. At this stage, however, the second loading mechanism 41 is in the retracted configuration and therefore does not apply the second clamping force on the tubulars 20 and crosspieces 18a, 18b. As shown in the illustrative force-vector diagram of Figure 9, this may create an uneven load distribution across the row(s) of tubulars 20 and crosspieces 18a,18b below, with a greater force vector 96a at either end of the base structure 25 and a smaller force vector 96b at the centre of the base structure 25. The base structure 25 may be subject to a bending moment about its longitudinal axis, which may result in a slight amount of bending of the base structure 25, however this is not illustrated in Figure 8.

Figure 10 shows the second loading mechanism 41 in operation. At this stage, the second loading mechanism 41 has been reconfigured to the extended configuration. This may have been achieved by rotating the turning wheel 65 causing the extendable member 60 to extend relative to the base structure 25. The pressure plate 76 engages the loading surface 92 of the upper crosspiece 18b, and thus causes the second clamping force, which includes a third load 98, to be applied on the tubulars 20 and crosspieces 18a,18b. The third load 98 is applied in a region intermediate the regions of the first and second loads 94a, 94b. As illustrated by force vectors 100 in Figure 11, the third load 98 may help to balance the load distribution across the tubulars 20 and crosspieces 18a,18b. This may provide for enhanced packing of the tubulars 20. It should be noted that the force-vector diagrams of Figures 9 and 11 are not intended to be indicative of the magnitude of the forces, but rather merely intend to show an exaggerated possible distribution of the forces.

Figure 12 shows an alternative retaining device 122. The alternative retaining device 122 is similar in many respects to the retaining device 22 of Figures 4 to 7, therefore like features have been denoted by like numerals incremented by 100 and are not described again for brevity. Furthermore, the side members 12 of the frame 11 have been omitted from Figure 12 for clarity.

The alternative retaining device 122 differs from the retaining device 22 in that it includes a plurality of second loading mechanisms 141. In this particular example, the alternative retaining device 122 is provided with nine second loading mechanisms 141, which corresponds to the number of tubulars 120 below. However, the alternative retaining device 122 may be provided with any number of second loading mechanisms 141, which may be irrespective of the number of tubulars 120 positioned between the side members 21 of the frame 11.

Each of the second loading mechanisms 141 include a pressure plate 176 to apply a second clamping force on each tubular 120 individually, placing them under compression as illustrated by arrows 181. This causes the tubulars 120 to press down on the crosspiece 118 below causing the deformable, resilient material of the crosspiece 118 to deform, thereby securing the tubulars 120 in place. In this example, the pressure plates 176 also comprise a deformable, resilient material configured to engage the upper surfaces of the tubulars 176, helping secure them in place and avoiding damage to the tubulars 120 which may result from, for example, a pressure plate having a metal surface. In this example, the pressure plates 176 directly engage the upper surfaces of the tubulars 120, as no crosspiece 18 is provided between the retaining device 122 and tubulars 120. However, in other examples, a crosspiece 118 may be provided between the retaining device 122 and tubulars 120.

Referring to Figure 13, there is shown a further alternative retaining device 222. The retaining device 222 is similar in many respects to the retaining device 22 of Figures 4 to 7, therefore like features have been denoted by like numerals incremented by 200 and are not described again for brevity. Furthermore, the side members 12 of the frame 11 have been omitted from Figure 13 for clarity.

The retaining device 222 includes hooks 228a, 228b configured to engage protrusions 244 formed on the side members 12 of the frame 11. The hooks 228a, 228b may be operated in a similar manner to that described above for the retaining device 22. The alternative retaining device 222 differs from the retaining devices 22 and 122 in that the base structure 225 has a lower surface configured to act as a pressure plate 276 for applying the second clamping force. In this example, the base structure 225 is therefore configured to apply both the first and second clamping forces on the tubulars 220 and crosspieces 218. The lower surface of the base structure 225 may be provided with a deformable, resilient material for engaging the tubulars 220.

The retaining device 222 comprises an upper bar 286 configured to extend above and across the base structure 225. The upper bar 286 may be connected to one or more of the side members of the frame (not shown) and configured to cooperate with the second loading mechanism 241. The second loading mechanism 241 is connected to the base structure 225 and comprises the same parts as the load-disturbing mechanism 41, illustrated in Figure 7; these parts are not described again for brevity.

However, the second loading mechanism 241 differs from the second loading mechanism 41 in that the extendable member 260 of the second loading mechanism 241 is configured to extend in an opposite direction to that of the second loading mechanism 41, that is in a direction away from the tubulars 220. More specifically, the extendable member 260 extends upwards into abutment with a lower surface of the upper bar 286, which together with the side members provides a support for the extendable member 260 to react off. The base structure 225 may be configured to resist longitudinal bending, and for example may comprise a cross-sectional I-bar, or other shape comprising a large second area moment.

As with the examples above, the hook structures 228a, 228b may be operated to apply the first clamping force. This may be achieved by moving the hooks 228a, 228b from the inactive configuration to the active configuration to operate with the side members 12 of the frame 11. At this stage, the load distribution across the tubulars 220 may be uneven, in the sense that a greater load may be applied at either end of the base structure 225 than that applied at the centre.

In order to balance the load distribution, the second clamping force may be applied on the tubulars 220 by operating the second loading mechanism 241 causing the extendable member 260 to extend upwards and push off the upper bar 286, such that a reaction force is created causing the second clamping force to be applied on the tubulars 220 and crosspiece 218. The second clamping force may assist with balancing the load across the tubulars 220.

Claims

CLAIMS: 1. An apparatus for packing elongate members, comprising: a frame comprising side members; and a retaining device for retaining elongate members positioned between the side members, the retaining device comprising: a base structure; a first loading mechanism comprising load interfaces on opposing end regions of the base structure, the load interfaces being operable with a respective side member to apply a first clamping force on the elongate members; and a second loading mechanism connected to the base structure intermediate the load interfaces and being operable to apply a second clamping force on at least one of the elongate members.
2. The apparatus of claim 1, wherein the base structure is configured to provide a support for the second loading mechanism to react off to apply the second clamping force.
3. The apparatus of claim 1 or 2, wherein the second loading mechanism comprises an extendable member extendable relative to the base structure.
4. The apparatus of claim 3, wherein the second loading mechanism is reconfigurable between a retracted configuration, wherein the extendable member is retracted relative to the base structure, and an extended configuration, wherein the extendable member is extended relative to the base structure.
5. The apparatus of claim 4, wherein the second clamping force is applied on the at least one of the elongate members by reconfiguring the second loading mechanism from the retracted configuration to the extended configuration.
6. The apparatus of claim 4 or 5, wherein the second loading mechanism comprises an actuator for reconfiguring the second loading mechanism between the retracted and extended configurations.
7. The apparatus of claim 6, wherein actuator is manually operated and the extendable member is extendable by relative rotation with respect to the actuator.
8. The apparatus of any of claims 3 to 7, wherein the extendable member comprises a pressure plate for applying the second clamping force.
9. The apparatus of any preceding claim, wherein the second loading mechanism is disposed centrally between the load interfaces.
10. The apparatus of any preceding claim, wherein the first clamping force, in use, comprises a first load applied in a region towards one of the side members and a second load applied in a region towards the other of the side members, wherein the second clamping force comprises a third load applied in a region intermediate the side members.
11. The apparatus of any preceding claim, wherein the load interfaces are reconfigurable between an inactive configuration, wherein the first clamping force is not applied, and an active configuration, wherein the first clamping force is applied.
12. The apparatus of claim 11, wherein the first loading mechanism comprises a control mechanism for reconfiguring the load interfaces between the inactive and active configurations.
13. The apparatus of any preceding claim, wherein the apparatus comprises an upper crosspiece positioned between the elongate members and the retaining device.
14. The apparatus of claim 13, wherein the upper crosspiece is configured to transmit the first clamping force and the second clamping force onto the elongate members.
15. The apparatus of claim 13 or 14, wherein the upper crosspiece comprises a first longitudinal section and a second longitudinal section, wherein the first longitudinal section is configured for engagement with the retaining device and the second longitudinal section is configured for engagement with the elongate members.
16. The apparatus of claim 15, wherein the first longitudinal section is articulated and comprises a central portion and two side portions.
17. The apparatus of claim 16, wherein the central portion comprises a loading surface configured to be engaged by the second loading mechanism.
18. The apparatus of claim 16 or 17, wherein the central portion and/or the side portions comprise a series of raised surfaces configured to be engaged by the base structure.
19. The apparatus of any preceding claim, wherein the apparatus comprises a plurality of rows of elongate members positioned between the side members of the frame and at least one crosspiece for positioning between each of the plurality of rows of elongate members.
20. The apparatus of claim 19, wherein the at least one crosspiece comprises a material configured to deform, in use, under application of the first clamping force and/or the second clamping force.
21. The apparatus of any preceding claim, wherein the retaining device is height adjustable with the side members.
22. The apparatus of claim 21, wherein the side members comprise a plurality of interface structures arranged such that the retaining device is operable with the side members at various heights or positions.
23. The apparatus of any preceding claim, wherein the apparatus is configured to pack lengths of drill pipe suitable for use in drilling an oil-and-gas wellbore.
24. A method for packing elongate members, the method comprising: positioning elongate members between side members of a frame; positioning above the elongate members a retaining device comprising: a base structure a first loading mechanism connected to the base structure and comprising load interfaces on opposing end regions thereof, the load interfaces being operable with a respective side member to apply a first clamping force on the elongate members; and a second loading mechanism connected to the base structure intermediate the load interfaces and being operable to apply a second clamping force on at least one of the elongate members; operating the first loading mechanism to apply the first clamping force on the elongate members; and operating the second loading mechanism to apply the second clamping force on the elongate members.
25. The method of claim 24, wherein operating the load interfaces comprises reconfiguring the load interfaces between an inactive configuration, wherein the first clamping force is not applied, and an active configuration, wherein the first clamping force is applied; and wherein operating the second loading mechanism comprises reconfiguring the second loading mechanism between a retracted configuration, wherein an extendable member of the second loading mechanism is retracted relative to the base structure, and an extended configuration, wherein the extendable member is extended relative to the base structure.