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US20060243453A1 - Tubing connector - Google Patents

Tubing connector Download PDF

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Publication number
US20060243453A1
US20060243453A1 US11/115,610 US11561005A US2006243453A1 US 20060243453 A1 US20060243453 A1 US 20060243453A1 US 11561005 A US11561005 A US 11561005A US 2006243453 A1 US2006243453 A1 US 2006243453A1
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US
United States
Prior art keywords
tubing
connector
coiled tubing
section
end section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US11/115,610
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English (en)
Inventor
L. McKee
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Schlumberger Technology Corp
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US11/115,610 priority Critical patent/US20060243453A1/en
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION reassignment SCHLUMBERGER TECHNOLOGY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MCKEE, L. MICHAEL
Priority to CA002542675A priority patent/CA2542675A1/en
Priority to DK200600555A priority patent/DK200600555A/da
Priority to NO20061804A priority patent/NO20061804L/no
Priority to EA200600672A priority patent/EA009319B1/ru
Publication of US20060243453A1 publication Critical patent/US20060243453A1/en
Priority to US11/873,224 priority patent/US20080073085A1/en
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/041—Couplings; joints between rod or the like and bit or between rod and rod or the like specially adapted for coiled tubing
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/16—Connecting or disconnecting pipe couplings or joints
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes

Definitions

  • the present invention generally pertains to oilfield equipment, and more particularly to a device and method for connecting tubing for downhole use.
  • Coiled tubing is used in a broad array of applications in oilfield operations such as drilling and completing oil and gas wells, conveying equipment, and performing maintenance on completed oil and gas wells.
  • To deploy coiled tubing into a wellbore the coiled tubing string is unreeled or unspooled from a coiled tubing reel, run over an injector gooseneck and inserted into a wellhead system for injecting the coiled tubing into the wellbore.
  • To retract coiled tubing from a wellbore the coiled tubing is reeled or spooled back out of the wellbore through the wellhead system over the gooseneck and onto the coiled tubing reel.
  • connections are required between coiled tubing strings, for example, in situations when the length of coiled tubing required for an operation exceeds the capacity of the coiled tubing reel; when the capacity of handling equipment limits the permissible weight of the coiled tubing reel, thereby limiting the length of coiled tubing permitted to be spooled thereon; when a repair is required in coiled tubing; or when retrieving a length of coiled tubing from a well.
  • butt-welding is commonly used. Such a weld is made by placing together the ends of two segments of tubing, each segment having an end cut perpendicular to its axis, the ends being placed in line which each other (“butted” together), and a making circumferential weld placed around the juncture of the cut ends. Welding in field conditions is more challenging and less robust than the bias-type welding that is used under controlled conditions in coiled tubing manufacturing.
  • Butt welded sections of coiled tubing usually are weaker and have much shorter low cycle fatigue life than the sections of coiled tubing without welding: typically a butt weld has a low cycle fatigue life in the order of 50% to 60% of the low cycle fatigue life of the coiled tubing.
  • verification testing using methods such as X-ray, tensile testing, or pressure testing of the butt weld performance is required prior to deployment of the welded coiled tubing in a wellbore.
  • often connections are required in areas where explosive conditions may be present which lead to the need to take additional safety precautions in field welding. In sum, field welding is a time-consuming and operationally undesirable method for connecting two segments of coiled tubing together.
  • Stiff connectors are used typically for connecting tools and devices to the end of coiled tubing such as for connecting a tool string to the end of unreeled coiled tubing prior to insertion into the wellbore. Stiff connectors may be used during wellbore deployment to connect between one or more unreeled coiled tubing strings. Stiff connectors however are not spooled with the coiled tubing on the coiled tubing reel as they lack the requisite flexibility to bend around the coiled tubing reel and deployment equipment. As a result, stiff connectors present a number of drawbacks.
  • stiff connectors Like field welding, the use of stiff connectors in wellbore deployment requires stopping the unreeling of the coil tubing, installing the stiff connector into the coiled tubing, making the connection, and then restarting the unreeling of the coiled tubing string to deploy the connected coiled tubing string into the wellbore. Furthermore, stiff connectors are often larger in diameter than the coiled tubing and are fitted externally about the coiled tubing. As such, they cause operational difficulties because they do not pass through the wellhead equipment.
  • Stiff connectors are known that are designed to be the same diameter as the coiled tubing or to have an end that can be inserted into the interior diameter of the coiled tubing; such connectors are referred to herein as internal connectors.
  • Internal connectors offer operational advantages over externally placed connectors as the internal connectors do not cause an increased outer diameter over the connected portion of the tubing string.
  • the use of stiff internal connectors in coiled tubing nevertheless poses difficulties.
  • Use of a stiff connector with flexible coiled tubing creates an abrupt transition between the connector and the tubing. As the coiled tubing is bent in routine activities, the end of the coiled tubing adjacent to the end of the stiff connector flexes to an undesirable degree.
  • This area is commonly called the hinge point as the bending can be so severe as to resemble a hinged connection.
  • Such straining of the coiled tubing at a stiff connection can quickly make the coiled tubing unsuitable or unsafe for use. It is common that tubing used with a connector becomes unsuitable for use or fails after only a few bending/straightening cycles.
  • stiff connectors lack the flexibility to permit them to be spooled onto the coiled tubing reel.
  • one end of a stiff connector is connected to the terminal end of the coiled tubing and the connector is relatively short, it may be possible to spool coiled tubing onto a reel with a stiff connector attached, provided that the opposite end of the connector is not connected to anything.
  • One such internal connector for connecting one coiled tubing string to another coiled tubing string or to a completion string (a fixture for permanent installation in a well) to a coiled tubing string is described in U.S. Pat. No. 6,474,701 issued on Nov. 5, 2002 to Bowles et al.
  • a pair of connectors comprising a first connector disposed about a first end of a severed tubing string and a second connector disposed about a second end of a severed tubing string is used to connect one or more well tool assemblies to the coiled tubing.
  • Coiled tubing connectors like the coiled tubing itself, need to be compatible with the environment in which they will be used. Testing is required to demonstrate that significant degradation to or failure of the coiled tubing connector will not result from exposure to wellbore environments.
  • coiled tubing may used for delivering acid treatments to subterranean formations, or in environments in which elevated levels of H2S are present. The acid testing reported in SPE 89527 on various connector materials shows this compatibility can vary.
  • an internal flexible connector from materials having the same or similar chemical resistance as the coiled tubing.
  • a particular challenge to using a flexible connector and coiled tubing made of conventional materials is the varying range of material properties generally accepted in materials such as commercial grade steel used to make coiled tubing. These materials normally are produced with a 10-20% tolerance for yield strength. For example, 4140 (18-22 Rc) steel is known to have a yield strength between 80,000 psi and 95,000 psi. This variation in yield strength is the foundation for design limitations between the connector and the coiled tubing. For example, if one of the components has a yield strength near the minimum allowed (“low yield component”) and the other component has a yield strength near the maximum allowed (“high yield component”), the strain in the components under the same conditions would differ, leading to differing low cycle fatigue lives.
  • the low yield component when the low yield component reaches the yield point, the low yield component begins to deform plastically but the high yield component remains in its elastic range and does not yield.
  • the low yield component already has deformed significantly.
  • low yield component would have as much as 4% strain while the high yield component would have a strain of about 0.5%. Since low cycle fatigue life is closely related to the amount of cyclic strain, the low yield component will fail significantly sooner than the high yield component.
  • the flexible connectors that are known, such as that disclosed in SPE 89527, have a flexible section in the center of the connector. This middle flexible section is designed to have a bending stiffness similar to that of the coiled tubing. The end sections on either side of the flexible center section are much stiffer than the coiled tubing.
  • the design theory behind such a configuration is to provide a flexible center section of the coiled tubing connector that deforms similarly to the coiled tubing itself under the same amount of strain.
  • the low cycle fatigue performance of these flexible connectors depend both on the stiff end connections providing a gradual transition between the flexible coiled tubing and the flexible center section of the connector and on the flexible centers section having similar stiffness and fatigue life to the coiled tubing.
  • the present invention provides a method of connecting a first tubing and a second tubing using an internal tubing connector having a bore, the connector having a first end section having a tapered outer surface and stiff section wherein the stiff section of the connector is secured to the first and second tubings.
  • the internal surface of the connector along the bore is also tapered.
  • a second end section having a tapered external surface is also provided and disposed within the second tubing.
  • at least one of the first tubing or second tubing is coiled tubing, and in particular embodiments, both of the tubings are coiled tubing. In the methods of the present invention, at least one of the first or second tubings may be spooled on a reel.
  • the connector and method of connecting of the present invention is useful particularly in making repairs in coiled tubing, wherein a section of coiled tubing is damaged or removed and the apparatus and method of the present invention is used to repair, patch or generally connect the two sections of coiled tubing between which a portion of tubing has been damaged or removed.
  • the connector apparatus of the present invention useful for connecting a first and a second section of tubing comprises a body with a longitudinal bore therethrough, a first end section, and a stiff section; the first end section of the connector having a tapered outer surface; and the exterior of the stiff section adapted to be connected to the inner diameter of a first and a second tubing.
  • the connector may further comprise a second end section, the second end section having a tapered outer surface and the stiff section being disposed between the first and the second end sections.
  • the first or second end section may further comprise a tapered internal surface along the bore.
  • An annular lip may be provided about the body and adapted to be disposed between ends of the first and second sections of tubing.
  • One or more seals may be disposed between the connector body and the first or the second, or both, tubings.
  • the stiff section of the connector of the present invention may be secured within the first and second tubings by engaging the exterior surface of the body with the inner surface of the tubing using a plurality of indentations, grooves, ridges, punch hole, or other connective means.
  • a debris barrier is provided between at least one end section of the connector and the tubing.
  • the present invention in specific embodiments relates to a method of deploying coiled tubing in a wellbore comprising providing a coiled tubing connector having a body with a bore throughout, the body having first and second end sections with tapered external surfaces and a stiff section disposed between the first and the second end sections; placing one end section into a first coiled tubing section, placing the second end section into a second coiled tubing, securing the stiff section to the inner diameter of the first and second coiled tubings to form a connected tubing and lowering the connected tubing into a wellbore.
  • the method may further comprise retrieving the coiled tubing from the wellbore.
  • the first or second coiled tubing may be disposed on a reel.
  • the connected coiled tubing may be disposed on a reel.
  • the connector may comprise an annular lip disposed about the body and adapted to be disposed between ends of the first and second sections of coiled tubing and in some embodiments, the connector may comprise at least one barrier to prevent debris from entering between the end section and the coiled tubing.
  • FIG. 1 is a representative stress/strain curve for a grade of steel.
  • FIG. 2 is side view of a specific embodiment of a coiled tubing connector constructed in accordance with the present invention and in use to connect a section of coiled tubing to a tool string.
  • FIG. 3A is a side view of another specific embodiment of a coiled tubing connector constructed in accordance with the present invention similar to the one shown in FIG. 2 but shown not connected to any coiled tubings.
  • FIG. 3B is a side view of another specific embodiment of a coiled tubing connector constructed in accordance with the present invention.
  • FIG. 3C is a side view of another specific embodiment of a coiled tubing connector constructed in accordance with the present invention.
  • FIG. 4 is side view of two coiled tubing connectors constructed in accordance with the present invention, and in use to connect coiled tubing to a tool string.
  • FIG. 5 is a side view of a specific embodiment of a coiled tubing connector constructed in accordance with the present invention, and in use to connect two sections of coiled tubing to a tool string.
  • FIG. 6A is a strain diagram from a finite element model of a prior art internal coiled tubing connector having a flexible center section.
  • FIG. 6B is a strain diagram from a finite element model of an embodiment of a coiled tubing connector according to the present invention.
  • FIG. 7 is side view of another specific embodiment of a coiled tubing connector constructed in accordance with the present invention, and in use to connect two sections of coiled tubing.
  • FIG. 2 a coiled tubing connector 10 constructed in accordance with the present invention and in use to connect a first section of coiled tubing 12 and a second section of coiled tubing 14 .
  • the connector 10 having a body 16 having a longitudinal bore 18 therethrough, comprises a stiff section 27 and at least one end section 28 .
  • stiff section 27 is provided between two end sections 28 , as is shown FIG. 2 .
  • body 16 of connector 10 may be discontinuous, and in further embodiments, stiff section 27 is separable from one or more end sections 28 .
  • body 16 of connector 10 is a continuous body in which one region of connector body 16 is stiff section 27 and other region or regions of connector body 16 are end section or sections 28 .
  • Such an embodiment is particularly useful to be placed between a first section of coiled tubing 12 and a second section of coiled tubing 14 to form a repair between the two section, for example when an area has been damaged, stressed, or is of inferior quality.
  • the stiffsection 27 of connector 10 has an outer diameter that it will fits snugly within the inner diameter of first and second sections of coiled tubing 12 and 14 .
  • the exterior diameter of body 16 remains essentially constant throughout stiff section 27 , excepting in localized areas where a means, such as a groove or indentation, to effect a connection with coiled tubing 12 and 14 are present.
  • external diameter 29 of body 16 gradually decreases from the end 31 of the end section 28 proximate to the stiff section 27 towards the distal end 33 of the body 16 , such that the external diameter of end section 28 of body 16 is not engaged snuggly within the interior diameter of coiled tubing 12 or 14 .
  • end section 28 is not in contact with the inner diameter of the coiled tubing 12 or 14 owing to the decreasing external diameter 29 of end section 28 .
  • This decreasing external diameter may be constructed in any variety of ways that provides a smaller external diameter at the distal end 33 of end section 28 ; examples of ways by which a taper may be formed include but are not limited to a single angle, a series of short angle sectors, a constant radius, or a compound radius.
  • the restrictive bend feature avoids the formation of a hinge point resulting from stress repeatedly concentrating in areas. It is known that such hinge points create a week point in coiled tubing connectors.
  • this restrictive bend feature provides a transition between the stiff section 27 of connector 10 and the coiled tubing 12 or 14 and distributes the strain in the coiled tubing over the length of end section 28 rather than in a localized hinge point. By such a strain distribution, the maximum stress imposed on any particular point of coiled tubing 12 or 14 overlapping end section 28 and the duration of time at which any particular point is subjected to that stress is reduced. This serves to improve the low cycle fatigue performance of the overall coiled tubing and connector configuration.
  • Such a configuration is notably different from known flexible internal connectors and is counter to the conventional approach of providing a flexible middle section with stiffer section on either side.
  • the coiled tubing connector of the present invention is useful to provide a connection that is flexible on both ends and stiff in the middle.
  • the diameter of the internal surface of body 16 along longitudinal bore 18 in end section 28 may decrease in a similar manner to external diameter 29 , may remain the same throughout end section 28 , or may increase to form an internal tapered surface 30 .
  • the cross sectional wall thickness of body 16 in end section 28 decreases toward distal end 33 as a result of decreasing external diameter 29 . This decreasing wall thickness makes end section 28 more flexible at distal end 33 and increasingly less flexible along the length of end section 28 extending to the end of stiff section 27 . In this way, connector 10 is most flexible at the distal end 33 of end section 28 and has diminishing flexibility traversing toward stiff section 27 along the length of end section 28 such that the stiffest area of end section 28 is at end 31 adjacent to stiff section 27 .
  • Connector 10 may be secured to the coiled tubing 12 and 14 in stiff section 27 by techniques suitable for use with internal connectors such as roll-on connectors, screws, crimping, and dimpling.
  • FIG. 2 the connection between stiff section 27 and coiled tubing 12 and 14 is shown made by indentations 22 on the outer surface of stiff section 27 receiving protuberances 20 on the coiled tubing 12 and 14 .
  • Such indentations may be made a variety of ways such as surrounding the coiled tubing with a mold and pressing the mold to form indentations, using a push or screw to form the indentations, or using a pre-pattern of weaker points in stiff section 27 into which coiled tubing 12 or 14 may be easily pressed.
  • the exterior surface of stiff section 27 may be patterned in a manner to facilitate this connection with coiled tubing 12 and 14 .
  • indentations in the exterior surface of stiff section 27 may spread uniformly about the circumference in a localized area or along the length of stiff section 27 .
  • depressions for receiving screws holes may be provided in the exterior surface of stiff section 27 ; such depressions may similarly be in a localized area or along the length of stiff section 27 .
  • the pattern, shape, or depth of such indentations may be varied and in particular, be varied in such a manner that the stress during bending of the connection is distributed across the indentations and not concentrated in a limited localized area.
  • this variation may be done in such a manner as to vary the relative snugness of the connection between connector 10 and coiled tubing 12 or 14 across stiff section 27 of connector 10 such that the connection between connector 10 and coiled tubing 12 or 14 is relatively snug near the ends of coiled tubing 12 or 14 and the connection is less snug in other areas of stiff section 27 of connector 10 .
  • dimple screws closest to the ends of coiled tubing 12 or 14 of the tubing can be tightened to a different depth compared to those screws furthest from the ends of coiled tubing 12 or 14 .
  • indentations may be provided on the internal surface of body 16 along longitudinal bore 18 .
  • a thinner wall section of body 16 is provided in desired locations at which coiled tubing 12 or 14 maybe pressed or crimped to secure contact between connector 10 and coiled tubing 12 or 14 .
  • a groove may be provided around the circumference of stiff section 27 or a series of circumferential or partially circumferential grooves may be placed or staggered along the length of stiff section 27 .
  • Various combinations of these techniques may also be used and are considered within the scope of the present invention.
  • Connector 10 may preferably be provided with one or more seals 24 to prevent fluid leakage between the connector 10 and each of either or both of the coiled tubing 12 / 14 .
  • seals 24 may be of any known type, including but not limited to O-rings, chevron seals, T-seals, dynamic seals such as PolyPakTM, and various other elastomeric devices.
  • the present connector 10 may include an annular lip 26 disposed about the body 16 in the stiff section 27 and positioned such that it is disposed between the respective ends of the coiled tubings 12 and 14 .
  • the diameter of annular lip 26 is the same or essentially equivalent to the outer diameter of coiled tubing 12 and 14 .
  • annular lip 26 does not preclude connector 10 from passing through the wellhead equipment.
  • Annular lip 26 provides support for the end of the coiled tubing 12 or 14 or to reduce forces that cause flaring of tubing ends and also to contain and protect the tubing ends.
  • the annular lip 26 functions to reduce deformation or “egging” of the ends of the coiled tubing 12 or 14 during use.
  • a flow control device such as a check valve, may be used in conjunction with connector 10 .
  • the flow control device permits fluid flow through in one configuration and restricts fluid flow through in another configuration.
  • Methods of switching such flow control devices from one configuration to another configuration are well known and include, for example, exerting an axial external pressure on the connector, dropping a ball, or providing a control signal.
  • Such embodiments are of particular use when the coiled tubing is under pressure, such as well pressure or fluid pressure.
  • the flow control device may be placed within stiff section 27 of connector 10 or within coiled tubing 12 or 14 adjacent to connector 10 .
  • a combination of internal and external flow control devices may be also used.
  • the decreasing exterior diameter 29 of end section 28 can be constructed on the external surface of body 16 in a variety of ways, including but not limited to with a single angle, a series of short angle sectors, a constant radius or a compound radius.
  • the diameter of the internal surface of body 16 along longitudinal bore 18 may increase in end section 28 to form an internal tapered surface 30 .
  • end section 28 is shown having an outer tapered surface 29 and a tapered internal surface 30 in longitudinal bore 18 .
  • This internal tapered surface 30 similarly maybe constructed in a variety of ways, including but not limited to with a single angle, a series of short angle sectors, a constant radius, or a compound radius.
  • end section 28 includes an internal tapered surface 30 and a tapered outer surface of body 29 .
  • end section 28 includes a plurality of outer tapered surfaces, or short angle sectors, 29 A, 29 B and 29 C, and internal surface 30 is not tapered.
  • end section 28 includes a tapered outer surface 29 formed by a constant radius and internal surface 30 in the longitudinal bore 18 is not tapered.
  • Connector 10 constructed in accordance with the present invention and in use to connect a first section of coiled tubing 12 and a tool string 13 .
  • Connector 10 has a body 16 having a longitudinal bore 18 therethrough and comprises a stiff section 27 and an end section 28 .
  • connector 10 may disassembled by separating stiff section 27 may be separated from end section 28 and assembled by attached stiff section 27 to end section 28 by using any number of connection methods known for connecting while maintaining a flush exterior surface such as threading, patterned jointing, or lock and key.
  • Stiff section 27 of connector 10 has an outer diameter that fits snugly within the inner diameter of coiled tubing 12 .
  • the other end 41 of stiff section 27 connects to tool string 13 .
  • Such a connection to tool string 13 may be made by any number of connection methods known for connecting while maintaining a flush exterior surface such as threading, patterned jointing, or lock and key.
  • end section 28 the external diameter 29 of body 16 gradually decreases from end of the end section 28 proximate to the stiff section 27 towards the distal end 33 of the body 16 , such that the external diameter 29 of end section 28 at the distal end 33 of body 16 is not engaged snuggly within the interior diameter of coiled tubing 12 .
  • end section 28 When coiled tubing 12 is straight, end section 28 is not in contact with the inner diameter of the coiled tubing owing to its decreasing external diameter 29 . In this way, there is a limited area of contact between coiled tubing 12 / 14 as it bends over the length of end section 28 and that limited area of contact translates along the length of end section 28 as coiled tubing 12 bends. As such, the stress point occurring at the point of contact translates along the end section 28 and overlapping coiled tubing 12 , thereby avoiding the formation of a specific point of stress concentration or hinge point.
  • the restrictive bend feature of end section 28 previously described is present in the embodiment shown in FIG. 4 .
  • FIG. 5 A specific embodiment is shown in FIG. 5 in which two coiled tubing connectors 10 constructed in accord with the present invention are shown to connect a first section of coiled tubing 12 , a tool string 13 , and a second section of coiled tubing 14 .
  • Each coiled tubing connector 10 has a body 16 having a longitudinal bore 18 therethrough and comprises a stiff section 27 and an end section 28 .
  • Each tubing connector 10 is connected to coiled tubing 12 or 14 at stiff section 27 and to tool string 13 at one end 41 .
  • the first tubing connector 10 is connected at stiff section 27 to coiled tubing 12 and the second tubing connector 10 likewise is connected at stiff section 27 to coiled tubing 14 .
  • Stiff sections 27 have an outer diameter that fits snugly within the inner diameter of coiled tubing 12 .
  • End section 28 of each of the first and the second tubing connector 10 has an external diameter 29 that gradually decreases from the end 40 of the end section 28 proximate to the stiff section 27 towards the distal end 33 of the body 16 , such that the external diameter 29 of end section 28 at the distal end 33 of body 16 is not engaged within the interior diameter of coiled tubing 12 or 14 respectively when the coiled tubing is not bent.
  • first or second connector 10 may comprise a body 16 in which one region of the body 16 is stiff section 27 and another region of body 16 is end section 28 .
  • body 16 of the first or second connector 10 may disassembled by separating stiff section 27 from end section 28 and assembled by attached stiff section 27 to end section 28 using any number of connection methods known for connecting while maintaining a flush exterior surface such as threading, patterned jointing.
  • Stiff section 27 of each the first and second connectors 10 have an outer diameter that fits snugly within respectively the inner diameter of coiled tubing 12 or 14 .
  • End section 28 of each of the first and the second tubing connector 10 has an external diameter 29 that gradually decreases from the end 31 of the end section 28 proximate to the stiff section 27 towards the distal end 33 of the body 16 , such that the external diameter 29 of end section 28 at the distal end 33 of body 16 is not engaged within the interior diameter of coiled tubing 12 or 14 respectively when the coiled tubing is not bent.
  • This restrictive bend feature of end section 28 previously described is included in the embodiment shown in FIG. 5 .
  • Each of the embodiments described has a reduction in the exterior diameter of end section 28 .
  • coiled tubing 12 / 14 bends until it contacts end section 28 .
  • the contact point between coiled tubing 12 / 14 and end section 28 translates along the length of end section 28 , thereby avoiding a localized hinge point.
  • connector 10 of the present invention undergoes lower strain during bending and as a result, suffers lower fatigue and has a longer useful life.
  • FIGS. 6A and 6B output from finite element modeling is shown.
  • FIG. 6A illustrates the output of finite element modeling of a known internal coiled tubing connector having a flexible center section and stiff end sections; numerous areas of high strain concentration 50 are shown including an extended area of high strain concentration 50 in the flexible center section.
  • FIG. 6B illustrates the output of finite element modeling having the same inputs as FIG. 6B , except that the connector is modeled is of the present invention; few areas of high strain concentration 50 are shown for the present invention connector.
  • FIG. 6B illustrates the output of finite element modeling having the same inputs as FIG. 6B , except that the connector is modeled is of the present invention; few areas of high strain concentration 50 are shown for the present invention connector.
  • connector 10 may further be provided with a flow guide/debris barrier 32 disposed at each end of the connector 10 .
  • the barrier 32 may include a body 34 with a tubular section 36 extending therefrom and adapted to fit within the bore 18 of the connector 10 .
  • the body 34 may include a shoulder 38 designed to engage the tip of end section 28 of connector 10 .
  • Body 34 may include an annular recess 44 for receiving an annular seal 42 .
  • the body 34 may further include a tapered inner bore 40 .
  • the debris barrier 32 functions to keep debris and solids, which could impede controlled bending, out of the restrictive bend area between external diameter 29 of end sections 28 and internal surface 30 of the coiled tubings 12 / 14 .
  • Barrier 32 may be separate from the connector 10 , as shown, or it may be integral with the connector 10 .
  • barrier 32 maybe rigid or flexible.
  • An example of an integral flexible embodiment is an elastomeric cone molded to the end of connector 10 . Any combination of these techniques may be used. If barrier 32 is separate from connector 10 instead of integral with it, it may be held in position by a coiled tubing weld bead 46 on one side and connector 10 on the other side.
  • FIG. 7 further illustrates that connector 10 may include an anti-extrusion ring 48 adjacent seal 24 .
  • the present invention represents an improvement over prior coiled tubing connectors and methods.
  • Advantages of the present invention include a tensile strength similar to the tensile strength of the coiled tubing; the capability of bending around a coiled tubing reel and an injector gooseneck during operation; have a low cycle fatigue life similar to the coiled tubing; providing a pressure tight seal both from internal and external sources; and passing through a wellhead assembly.

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  • Environmental & Geological Engineering (AREA)
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  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
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  • Joints With Sleeves (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
US11/115,610 2005-04-27 2005-04-27 Tubing connector Abandoned US20060243453A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US11/115,610 US20060243453A1 (en) 2005-04-27 2005-04-27 Tubing connector
CA002542675A CA2542675A1 (en) 2005-04-27 2006-04-11 Tubing connector
DK200600555A DK200600555A (da) 2005-04-27 2006-04-21 Forbindelsesrör til rörledning
NO20061804A NO20061804L (no) 2005-04-27 2006-04-24 Rorkobling
EA200600672A EA009319B1 (ru) 2005-04-27 2006-04-26 Соединитель труб
US11/873,224 US20080073085A1 (en) 2005-04-27 2007-10-16 Technique and System for Intervening in a Wellbore Using Multiple Reels of Coiled Tubing

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US8393393B2 (en) 2010-12-17 2013-03-12 Halliburton Energy Services, Inc. Coupler compliance tuning for mitigating shock produced by well perforating
US8397814B2 (en) 2010-12-17 2013-03-19 Halliburton Energy Serivces, Inc. Perforating string with bending shock de-coupler
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US8714252B2 (en) 2011-04-29 2014-05-06 Halliburton Energy Services, Inc. Shock load mitigation in a downhole perforation tool assembly
US8875791B2 (en) 2010-10-18 2014-11-04 Schlumberger Technology Corporation Segmented fiber optic coiled tubing assembly
US8875796B2 (en) 2011-03-22 2014-11-04 Halliburton Energy Services, Inc. Well tool assemblies with quick connectors and shock mitigating capabilities
US8978817B2 (en) 2012-12-01 2015-03-17 Halliburton Energy Services, Inc. Protection of electronic devices used with perforating guns
US8978749B2 (en) 2012-09-19 2015-03-17 Halliburton Energy Services, Inc. Perforation gun string energy propagation management with tuned mass damper
US8985200B2 (en) 2010-12-17 2015-03-24 Halliburton Energy Services, Inc. Sensing shock during well perforating
WO2014175983A3 (en) * 2013-04-22 2015-03-26 Baker Hughes Incorporated System and method for splicing a non-spoolable tool anywhere along a coiled tubing string
US9062503B2 (en) 2010-07-21 2015-06-23 Baker Hughes Incorporated Rotary coil tubing drilling and completion technology
US9091152B2 (en) 2011-08-31 2015-07-28 Halliburton Energy Services, Inc. Perforating gun with internal shock mitigation
US9297228B2 (en) 2012-04-03 2016-03-29 Halliburton Energy Services, Inc. Shock attenuator for gun system
US9528327B1 (en) * 2011-09-23 2016-12-27 Global Tubing Llc Coiled tubing optimized for long, horizontal completions
US9598940B2 (en) 2012-09-19 2017-03-21 Halliburton Energy Services, Inc. Perforation gun string energy propagation management system and methods
CN111894504A (zh) * 2020-07-30 2020-11-06 合力（天津）能源科技股份有限公司 一种适用于套管及油管的液压密封补接器
US11274549B2 (en) 2020-03-18 2022-03-15 Saudi Arabian Oil Company Logging operations in oil and gas applications
US11286725B2 (en) * 2020-03-18 2022-03-29 Saudi Arabian Oil Company Drill pipe segments for logging operations
US11448026B1 (en) 2021-05-03 2022-09-20 Saudi Arabian Oil Company Cable head for a wireline tool
EP3542023B1 (en) * 2016-11-17 2023-07-26 Zilift Holdings Limited Spoolable splice connector and method for tubing encapsulated cable
US11859815B2 (en) 2021-05-18 2024-01-02 Saudi Arabian Oil Company Flare control at well sites
US11905791B2 (en) 2021-08-18 2024-02-20 Saudi Arabian Oil Company Float valve for drilling and workover operations
US11913298B2 (en) 2021-10-25 2024-02-27 Saudi Arabian Oil Company Downhole milling system
US20240117908A1 (en) * 2022-10-11 2024-04-11 National Oilwell Varco, L.P. Coiled tubing weld-on connector
US12054999B2 (en) 2021-03-01 2024-08-06 Saudi Arabian Oil Company Maintaining and inspecting a wellbore
US12276190B2 (en) 2022-02-16 2025-04-15 Saudi Arabian Oil Company Ultrasonic flow check systems for wellbores

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US9528327B1 (en) * 2011-09-23 2016-12-27 Global Tubing Llc Coiled tubing optimized for long, horizontal completions
US9297228B2 (en) 2012-04-03 2016-03-29 Halliburton Energy Services, Inc. Shock attenuator for gun system
US8978749B2 (en) 2012-09-19 2015-03-17 Halliburton Energy Services, Inc. Perforation gun string energy propagation management with tuned mass damper
US9598940B2 (en) 2012-09-19 2017-03-21 Halliburton Energy Services, Inc. Perforation gun string energy propagation management system and methods
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US8978817B2 (en) 2012-12-01 2015-03-17 Halliburton Energy Services, Inc. Protection of electronic devices used with perforating guns
US9909408B2 (en) 2012-12-01 2018-03-06 Halliburton Energy Service, Inc. Protection of electronic devices used with perforating guns
US9926777B2 (en) 2012-12-01 2018-03-27 Halliburton Energy Services, Inc. Protection of electronic devices used with perforating guns
WO2014175983A3 (en) * 2013-04-22 2015-03-26 Baker Hughes Incorporated System and method for splicing a non-spoolable tool anywhere along a coiled tubing string
US9695652B2 (en) 2013-04-22 2017-07-04 Baker Hughes Imcorporated System and method for splicing a non-spoolable tool anywhere along a coiled tubing string
US11713626B2 (en) 2016-11-17 2023-08-01 Schlumberger Technology Corporation Spoolable splice connector and method for tubing encapsulated cable
EP3542023B1 (en) * 2016-11-17 2023-07-26 Zilift Holdings Limited Spoolable splice connector and method for tubing encapsulated cable
US11274549B2 (en) 2020-03-18 2022-03-15 Saudi Arabian Oil Company Logging operations in oil and gas applications
US11286725B2 (en) * 2020-03-18 2022-03-29 Saudi Arabian Oil Company Drill pipe segments for logging operations
CN111894504A (zh) * 2020-07-30 2020-11-06 合力（天津）能源科技股份有限公司 一种适用于套管及油管的液压密封补接器
US12054999B2 (en) 2021-03-01 2024-08-06 Saudi Arabian Oil Company Maintaining and inspecting a wellbore
US11448026B1 (en) 2021-05-03 2022-09-20 Saudi Arabian Oil Company Cable head for a wireline tool
US11859815B2 (en) 2021-05-18 2024-01-02 Saudi Arabian Oil Company Flare control at well sites
US11905791B2 (en) 2021-08-18 2024-02-20 Saudi Arabian Oil Company Float valve for drilling and workover operations
US11913298B2 (en) 2021-10-25 2024-02-27 Saudi Arabian Oil Company Downhole milling system
US12276190B2 (en) 2022-02-16 2025-04-15 Saudi Arabian Oil Company Ultrasonic flow check systems for wellbores
US20240117908A1 (en) * 2022-10-11 2024-04-11 National Oilwell Varco, L.P. Coiled tubing weld-on connector

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CA2542675A1 (en) 2006-10-27
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NO20061804L (no) 2006-10-30
DK200600555A (da) 2006-10-28
EA200600672A2 (ru) 2006-10-27

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