RU2548635C1 - Device for shutoff of water-flooded formation part - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device comprises a pipe string run in to the well, a packer with a flow shutoff mounted in it. The packer is made as a hollow body with the upper row of openings placed above the sealing element in the packer. Inside the hollow body there is a pipe concentric to its axis and fixed rigidly to the pipe string from top and to the piston from bellow. The pipe with piston may be moved axially in regard to the hollow case of the flow shutoff. In the hollow body below the sealing element of the packer there is the lower row of openings. The piston is made hollow and plugged from below. Opposite the upper and lower rows of openings in the hollow body the piston is equipped with inner cylindrical sample capture and a row of feedthrough openings. In the hollow body above the upper row of radial openings there is a cam slot in the form of longitudinal groove and three transversal grooves. The transversal grooves are made from the upper, medium and lower parts of the lower part of the longitudinal grove. In cam slot of the hollow body there is a guide pin installed so that it may be moved axially and transversally. It is fixed rigidly in the piston above its upper inner circular sample capture. When the guide pin is placed in the transversal groove made of the medium part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper and lower rows of openings with over-packer and below-packer space of the well. When the guide pin is placed in the transversal groove made of the upper part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper row of openings with over-packer space of the well. The lower row of openings in the hollow body is sealed in tight-proof way by the piston. When the guide pin is placed in the transversal groove made of the lower part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the lower row of openings with below-packer space of the well. At that the upper row of openings in the hollow body is sealed in tight-proof way by the piston.

EFFECT: simplified design of the device, improved reliability of its operation and expanded functionality.

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Description

The invention relates to the oil and gas industry and can be used, in particular, to extend the anhydrous mode of operation of oil wells.

A device for intensifying oil production (RF patent No. 2282715, IPC EV 43/14, published on 08/27/2006 in bull. No. 24), including a packer with a flow switch installed in it, which is made in the form of a hollow body with holes, is known located below and above the sealing element of the packer, and inside the housing concentrically to its axis there is a pipe, which is connected with the lower part to the housing, and its upper part interacts with the annular sleeve with axial movement and provided with an annular seal on the outer surface and with shear pins fixing it in the case, which, when moving downward, after cutting the pins, overlaps the holes in the case located above the packer sealing element, thereby shutting off the flow from the holes below the packer sealing element.

The disadvantages of this device are:

- firstly, the low functionality of the flow switch, as it allows you to turn off the fluid flow only from the lower holes and does not allow you to turn off the fluid flow from the upper holes (when watering the well production from above);

- secondly, low work efficiency due to the fact that when water is supplied from above, it is impossible to extend the anhydrous mode of operation of oil wells;

- thirdly, the complexity of the design in operation, due to the fact that to turn off the lower holes it is necessary to remove the well pump from the well and by any known method (for example, using a geophysical elevator or pump unit) move the ring sleeve downstream and disconnect the flow from the holes below the packer sealing element;

- fourthly, limited functionality, so the device can only be operated with a sucker rod pump, since when operating the well with an electric centrifugal or screw pump, it is impossible to install the ball on the ring sleeve and move it down by creating excess pressure in the pipe string, since the pump is located above the device ;

- fifthly, removing a pump from a well, attracting a geophysical elevator or pump unit to move the annular sleeve down causes high material (process fluid, ball) and financial costs in operation.

The closest in technical essence is a device for operating a well and shutting off the flooded part of the formation (RF patent No. 2422422, IPC ЕВВ 43/00, published on July 20, 2011 in Bulletin No. 20), including a pipe string lowered into the well, a packer with the flow switch installed in it, which is made in the form of a hollow body with holes located above the packer sealing element, and inside the body concentrically to its axis there is a pipe, an annular sleeve with shear pins, with the possibility of axial movement after cutting the pin c, O-rings, while the pipe is rigidly connected to the pipe string, and the outside is equipped with a piston fixed in the housing with destructible elements, while the pipe with the piston after cutting the destructible elements have the possibility of axial movement downward relative to the body of the flow switch and the airtight overlap of the housing openings above the sealing packer element, also the pipe is equipped with an upper row of holes communicating with the holes of the housing above the sealing element of the packer, and a lower row of holes communicating with the same space of the well, and the annular sleeve is secured with shear pins inside the pipe above its upper row of holes, and the top is equipped with a seat for a ball discharged from the mouth into the pipe string, while after cutting the pins, the annular sleeve has the ability to move downward and seal the lower row of holes in the pipe , thus disconnecting the flow from the sub-packer space of the well.

The disadvantages of this device are:

- firstly, low reliability associated with the presence of destructive elements fixing the piston in the housing in the device structure, cut off at the rated load, while the impossibility of creating the calculated load (inclined barrel, sliding of the packer when unloading the pipe string onto the device) and / or miscalculations in determining the diameter of destructive elements can lead to failure of the device in operation;

- secondly, the complexity of the design in operation, due to the fact that to turn off the lower holes, it is necessary to remove the well pump from the well, drop the ball into the pipe string, create the necessary pressure with the pump unit to cut the pins of the ring sleeve and move it down and overlap bottom row of holes in the pipe;

- thirdly, removing the downhole pump from the well, attracting the pumping unit, tanker truck to move the ring sleeve down causes high material (process fluid, ball) and financial costs in the work;

- fourthly, limited functionality, so the device can only be operated with a sucker rod pump, since when operating the well with an electric centrifugal or screw pump, it is impossible to install the ball on the ring sleeve and move it down by creating excess pressure in the pipe string, since the pump is located above the device ;

An object of the invention is to simplify the design of the device in operation and increase the reliability of its operation, as well as reducing material and financial costs during the operation of the device and expanding its functionality.

The stated technical problem is solved by a device for shutting off the flooded part of the formation, including a pipe string lowered into the well, a packer with a flow switch installed in it, which is made in the form of a hollow body with an upper row of holes located above the packer sealing element and communicating with the packer space inside the hollow of the housing concentrically to its axis, a pipe is located, rigidly connected to the pipe string from above, and from the bottom to the piston, also the pipe with the piston can axially move Tel'nykh hollow body disconnector flux ring seals.

New is that in the hollow body below the packer sealing element a lower row of holes is made, communicating with the under-packer space of the well, the piston is hollow and muffled from below, and opposite the upper and lower rows of holes of the hollow body, the piston is equipped with an internal cylindrical selection and a number of through holes communicating with the interior of the pipe, while in the hollow body above the upper row of radial holes, a shaped groove is made in the form of one longitudinal groove and three transverse grooves, etc. why the transverse grooves are made of the upper, middle and lower parts of the longitudinal groove, and in the curly groove of the hollow body with the possibility of axial and transverse movement, a guide pin is mounted rigidly fixed in the piston above its upper inner annular selection, and when placing the guide pin in the transverse groove, made from the middle part of the longitudinal groove, while the upper and lower rows of holes of the hollow body by means of an internal cylindrical sampling and a number of through holes of the piston communicate with the interior of the pipe, and when the guide pin is placed in a transverse groove made from the upper part of the longitudinal groove, the upper row of holes of the hollow body through the inner cylindrical selection and a number of through holes of the piston communicates with the internal space of the pipe, while the lower row of holes of the hollow body is hermetically sealed blocked by a piston, and when placing the guide pin in a transverse groove made from the bottom of the longitudinal groove, the lower row of holes of the hollow body along the means of the inner cylindrical sampling and a number of through holes of the piston communicate with the inner space of the pipe, while the upper row of holes of the hollow body is hermetically sealed by the piston.

The figure 1 schematically shows the proposed device in longitudinal section.

The figure 2 shows a section aa of the device.

The figure 3 shows a scan of the curly groove.

The device for shutting off the flooded part of the formation includes a pipe string 2 lowered into the well 1 (see FIG. 1), a packer 3 with a sealing element and a flow switch 4 installed in it, which is made in the form of a hollow body 5 with the upper row of holes 6 located above the sealing element of the packer 3 and communicating with nadpakernym space 7 of the well 1.

Packer 3 is installed between the upper and lower zones of perforation, made respectively in the upper and lower parts of the reservoir. Inside the hollow body 5, a pipe 8 is located concentrically to its axis and is rigidly connected to the pipe string 2.

On top of the pipe 8 is rigidly connected to the string of pipes 2, and on the bottom of the pipe 8 is rigidly connected to the piston 9. The pipe 8 with the piston 9 are able to axially move relative to the hollow body 5 of the flow switch 4.

In the hollow body 5 below the sealing element of the packer 3, a lower row of holes 10 is made, communicating with the sub-packer space 11 of the well 1.

The piston 9 is hollow and muffled from below, and opposite the upper 6 and lower 10 rows of holes of the hollow body 5, the piston 9 is equipped with an inner cylindrical selection 12 (see FIGS. 1 and 2) and a number of through holes 13 communicating with the inner space 14 of the pipe 8 The length of the inner cylindrical sample 12 of the piston 9 exceeds the distance between the upper 6 and lower 10 rows of radial holes of the hollow body 5 of the flow switch 4.

The throughput of a number of through holes 13 made with a diameter D, for example, equal to 20 mm is greater than the total throughput of the upper 6 and lower 10 rows of radial holes made with a diameter d, for example, equal to 15 mm, which eliminates flow blocking and production stagnation in the annular space of the inner cylindrical sample 12 pistons 9.

In the hollow body 5 above the upper row of holes 6, a figured groove 15 (see Figs. 1 and 3) is made in the form of one longitudinal groove 16 and three transverse grooves 17 ', 17 ", 17".

The transverse grooves 17 ', 17 ", 17'" are made of the upper, middle and lower parts of the longitudinal groove 16.

In the figured groove 15 of the hollow body 5 with the possibility of axial and transverse movement, a guide pin 18 is mounted rigidly fixed in the piston 9 above its inner cylindrical selection 12.

When placing the guide pin 18 in the transverse groove 17 "made of the middle part of the longitudinal groove 16, the upper 6 and lower 10 rows of holes of the hollow body 5 through the inner cylindrical selection 12 and a number of through holes 13 communicate with the inner space 14 of the pipe 8.

When placing the guide pin 18 in the transverse groove 17 'made of the upper part of the longitudinal groove 16, the upper 6 row of holes of the hollow body 5 through the inner cylindrical selection 12 and a number of through holes 13 of the piston 9 communicates with the inner space 14 of the pipe 8, while the bottom row holes 10 of the hollow body 5 is sealed by a piston 9.

When placing the guide pin 18 in the transverse groove 17 ', made from the bottom of the longitudinal groove 16, the lower row of holes 10 of the hollow body 5 through the inner cylindrical sampling 12 and a number of through holes 13 communicates with the inner space 14 of the pipe 8, while the upper row of holes 6 of the hollow body 5 is sealed by a piston 9. Unauthorized fluid flows are eliminated by an annular seal 19, 20.

A device for disabling the flooded part of the reservoir works as follows.

At the wellhead, the device is installed in the initial position (see Figs. 1 and 3) so that the guide pin 18 is in the transverse groove 17 "of the figured groove 15, while the upper 6 and lower 10 rows of holes of the hollow body 5 by means of an internal cylindrical selection 12 and a series of through holes 13 are in communication with the inner space 14 of the pipe 8.

The device on the pipe string 2 is lowered into the well 1, while in the process of lowering the pipe string 2 into the well it is equipped with a pump (not shown in FIGS. 1, 2, 3) of any known construction, for example, electric centrifugal. Packer 3 is planted (see FIG. 1) between the upper and lower perforation intervals (not shown in FIGS. 1, 2, 3) of the reservoir.

Products from the well 1 (see FIG. 1) enter the device both from the lower perforation zone of the reservoir (not shown in FIGS. 1, 2, 3), that is, from the sub-packer space 11 (see FIG. 1) of the well 1 the lower row of holes 10 of the hollow body 5 into the annular space of the inner cylindrical sample 12 of the piston 9.

Also, products from the well 1 enter the device from the upper perforation zone of the reservoir (not shown in FIGS. 1, 2, 3), that is, from the over-packer space 7 (see FIGS. 1 and 3) of the well 1 through a series of radial holes 6 hollow body 5 into the annular space of the inner cylindrical sample 12 of the piston 9.

In the annular space of the inner cylindrical sampling 12 of the piston 9, the product flows entering the device from the upper and lower parts of the reservoir are mixed and through a series of through holes 13 enter the inner space 14 of the pipe 12 and then along the pipe string 2 rise to receive the borehole pump (in FIG. .1, 2, 3 not shown), which pumps products to the surface.

During the operation of well 1 (see Fig. 1), waterlogging occurs, and waterlogging can occur both in the upper part of the reservoir (nadpakerny space 7 above the sealing element of the packer 3), for example, due to casing flows, and in the lower part of the productive formation (sub-packer space 11 below the sealing element of the packer 3, for example, due to the pulling of the water cone to the lower perforation zone.

With the appearance of water in the production of the well, as evidenced by the increased water content of the produced products, the upper (overpacker space 7 of the well 1) or lower (subpacker space 11 of the well 1) water-saturated part of the reservoir is shut off.

To disconnect the lower water-saturated part of the reservoir from the initial position (see Figs. 1 and 3) from the wellhead, turn the pipe string 2 and pipe 8 rigidly connected to it with a piston 9 relative to the stationary hollow body 5 counterclockwise to an angle greater than 60 °, corresponding to the length (c = 0.1 m) of the transverse groove 17 ", for example 90 ° and the length 0.15 m, then lift the pipe string 2 to a length greater than the length b = 0.5 m, for example 0.8 m. After which turn the pipe string 2 and the pipe 8 rigidly connected to it with the piston 9 clockwise an angle greater angle 60 °, corresponding to the length (c = 0.1 m) of the transverse groove 17 ', for example 90 ° and a length of 0.15 m. As a result of the action, the guide pin 18 moves from the extreme left position upwards of the transverse groove 17 "of the figured groove 15 through the longitudinal groove 16 to the leftmost position of the transverse groove 17 'of the shaped groove 15, while the lower row of radial holes 10 of the hollow body 5 is hermetically sealed by the annular seals 20. As a result, the product flow from the lower water-saturated zone of the formation, i.e. from subpacker 11 the well space is turned off.

Further, the product flow comes only from the upper perforation zone (upper non-irrigated formation zone), that is, from the overpacker space 7 (see FIGS. 1 and 2) of the well 1 through the upper row of radial holes 6 of the hollow body 5 into the annular space of the piston inner cylindrical sample 12 9 and then through a series of through holes 13 into the inner space 14 of the pipe 8, from where the products are delivered through a pipe string 2 to a well pump (not shown in FIGS. 1, 2, 3).

Thus, the flow of extracted products from the lower zone of the productive formation, which is flooded, is shut off, and the products are extracted only from the upper non-irrigated zone of the formation.

To disconnect the upper water-saturated part of the reservoir from the wellhead from the initial position (see Figs. 1 and 3), from the wellhead turn the pipe string 2 and the pipe 8 rigidly connected to it with the piston 9 relative to the stationary hollow body 5 counterclockwise to an angle greater than the angle 60 °, corresponding to the length (c = 0.1 m) of the transverse groove 17 ", for example 90 ° and a length of 0.15 m, then lower the pipe string 2 to a length greater than a = 0.5 m, for example 0.8 m Then rotate the pipe string 2 and the pipe 8 rigidly connected to it with the piston 9 clockwise an angle greater than the angle of 60 °, corresponding to the length (c = 0.1 m) of the transverse groove 17 '", for example, 90 ° and a length of 0.15 m

As a result of the actions, the guide pin 18 moves from the extreme left position upwards of the transverse groove 17 "of the figured groove 15 through the longitudinal groove 16 to the extreme left position of the transverse groove 17 '" of the figured groove 15, while the upper row of radial holes 6 of the hollow body 5 is hermetically sealed by annular seals 19 of the piston 9. As a result, the flow of products from the upper water-saturated zone of the reservoir, i.e. from the overpacker space 7 of the well 1 is turned off.

Further, the product flow comes only from the lower perforation zone (lower non-irrigated formation zone), i.e. from the sub-packer space 11 (see Figs. 1 and 2) of the well 1 through the lower row of radial holes 10 of the hollow body 5 into the annular space of the piston inner cylindrical sample 12 9 and then through a series of through holes 13 into the inner space 14 of the pipe 8, from where the products are delivered through the pipe string 2 to a well pump.

Thus, the flow of extracted products from the upper zone of the productive formation, which is flooded, is shut off, and the products are extracted only from the lower non-irrigated zone of the formation.

The proposed device for shutting off the flooded part of the formation has a simple structure in operation, since removing the well pump from the well eliminates the opening of the device’s holes below the packer sealing element, it also excludes the use of additional equipment (pumping unit, tanker with process fluid) and equipment (ball) for shut off the fluid flow from the sub-packer space (lower perforation intervals) of the well, and this reduces material and financial costs s in the operation of the device, and due to the exclusion of destructive elements that are cut off at the calculated load from the design of the device, when the fluid flow is disconnected from the overpacker space (upper perforation intervals) of the well, the reliability of the device in operation increases.

In addition, the proposed device for shutting off the flooded part of the reservoir allows you to expand the functionality, so the device can be operated with any type of pump, and the product flow is switched from the upper and lower perforation intervals by axial and rotational movement of the pipe string from the wellhead.

Claims (1)

A device for shutting off the flooded part of the formation, including a pipe string lowered into the well, a packer with a flow switch installed in it, which is made in the form of a hollow body with an upper row of holes located above the packer sealing element, a pipe is concentric inside its hollow body, the pipe is rigidly rigid connected to the pipe string, and from the bottom to the piston, also the pipe with the piston have the possibility of axial movement relative to the hollow body of the flow switch, O-rings, characterized in that the lower row of holes is made in the hollow case below the packer sealing element, the piston is hollow and muffled from below, and opposite to the upper and lower rows of the hollow case holes, the piston is equipped with an internal cylindrical selection and a number of through holes, while a figured groove is made in the hollow case above the upper row of radial holes in the form of one longitudinal groove and three transverse grooves, and the transverse grooves are made of upper, middle and lower parts of the longitudinal groove, and in a curved groove in the hollow of the housing with the possibility of axial and lateral movement, a guide pin is mounted rigidly fixed in the piston above its upper inner annular selection, and when placing the guide pin in a transverse groove made from the middle part of the longitudinal groove, the device is configured to communicate the inner space of the pipe through a series of through holes piston, internal cylindrical sampling, the upper and lower row of holes with nadpakernym and podpakernym spaces of the well, and when placing In the transverse groove made from the upper part of the longitudinal groove, the device is configured to communicate the inner space of the pipe through a series of through holes of the piston, the inner cylindrical selection, the upper row of holes with the above-packer space of the well, while the lower row of holes in the hollow body is hermetically sealed by the piston, and when placing the guide pin in a transverse groove made from the bottom of the longitudinal groove, the device is configured to communicate internally th of the pipe through a number of through holes of the piston, the internal cylindrical sample, the lower row of holes with the well packer space, the upper row of holes of the hollow body is hermetically closed piston.

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