RU2313653C1 - Packer for pipe string pressure-testing - Google Patents

Abstract

FIELD: oil production, particularly pipe string pressure-testing inside well.

SUBSTANCE: packer comprises setting tool, lowering device made as cable head with cable, cylindrical body with seat and central axial and radial channels connecting outer body space with central axial channel thereof, sealing member installed on the body and bush sliding in axial direction. The bush has support anvils and is installed in the body. Pipe string section below pressure-testing interval has test clutch provided with calibrated central channel with inner diameter d less that inner diameter d₁ of pipe string. The pipe string has annular depression located over test clutch and having large pipe string clutch joint dimensions in longitudinal direction. Support anvils have longitudinal dimensions B corresponding to longitudinal dimension L of annular depression formed in test clutch and are spring-loaded outwards by means of spring plates. The support anvils are inserted in radial body channels. The body has technological pipe located in top part thereof. Body seat is made as restricted section of central axial channel located below radial channels. Sealing member is outside the channel and is installed on the body. The sealing member may air-tightly cooperate with central channel of test clutch. Bush has widened part formed in center thereof, as well as lower and upper ends having decreased diameters. Lower end the bush cooperates with support anvils from inside and is hermetically inserted in the body seat. Upper end of the bush cooperates with technological pipe from inside. Bush has serially arranged radial orifices and cap arranged upstream of the technological pipe. Cap comprises fishing head. Widened bush section may be engaged with support anvils from inside as support anvils cooperate with annular depression of test bush. Longitudinal short and long turnings connected with each other through figured turning are created on outer surface of technological pipe top. Long turning extends to technological pipe edge. Setting tool is made as pusher connected with lowering device and cooperating with fishing head of the bush from upper part thereof and as pipe installed on the pusher so that the pipe may rotate and move in axial direction. Lower pipe end encloses technological pipe. The technological pipe has inner pin cooperating with technological pipe turnings. In initial position the pin is arranged in short turning.

EFFECT: possibility of low-diameter pipe pressure-testing, decreased metal consumption and costs.

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Description

The invention relates to the oil and gas industry and is intended for crimping a pipe string in wells.

A known pressure testing packer (patent RU No. 2153570, IPC 7 ЕВВ 33/12, publ. 07/27/2000), comprising a housing, a sealing unit with a stop element, a lower sleeve and a seal chamber, a bypass device and a check valve, while it has a valve assembly with shear elements, a ball valve and a seat for this valve in the form of a cylindrical sleeve, and the body has an annular collar for restricting the movement of the lower sleeve, an annular groove, a stepped annular groove and radial holes for installing the shear screws, while the bypass device in is designed as a spool with an inner stepped recess corresponding to the inner stepped recess housing a spring and adjustment nut, establishing the spring force and length of stroke of the spool, and the seal chamber is formed by the sealing element and the annular groove of the housing.

The closest in technical essence is a packer (patent RU No. 2125148, IPC 7 ЕВВ 33/12, publ. 01.20.1999), comprising a cylindrical body with a central axial channel and a saddle on the inner surface, a sealing element mounted on the body with a lower support and a spacer ring, a casing forming an annular space with an inner surface with an outer surface of the housing, a piston located in the annular space, a spring-loaded pusher associated with the piston, a valve assembly located on the saddle of the housing and made in de axially movable bushings with supporting crackers, a shear element and a saddle at the upper end face, a ball locking element mounted in the saddle of the bush, the housing being made with axial channels connecting the annular space to the central axial channel, and the shear element is mounted on the bush with the possibility of limiting the longitudinal movement of the ball element.

Both analog and prototype have, to one degree or another, common flaws:

- firstly, the impossibility of crimping in columns of pipes of small diameter (for example, crimping a string of tubing with a diameter of 48 mm);

- secondly, the complexity of manufacturing, due to the large number of technically complex parts, which leads to an increase in the cost of the structure as a whole and, as a consequence, its high cost.

An object of the invention is the possibility of crimping a pipe string of a small diameter, as well as reducing the metal consumption of the structure and, as a consequence, its cost.

The stated technical problem is solved by a packer for crimping a pipe string containing a landing tool, a drain device, a cylindrical body with a saddle on the inner surface and central axial and radial channels connecting the outer space of the body with its central axial channel, a sealing element mounted on the body, movable in the axial direction and sleeve inserted into the housing with supporting crackers.

What is new is that the pipe string below the crimping interval is equipped with a compression sleeve equipped with a calibrated central channel with an inner diameter smaller than the internal diameter of the pipe string and an upstream ring sample with a large longitudinal dimension of the technological joints of the pipe string couplings, and support crackers made with a longitudinal the size corresponding to the longitudinal size of the ring sample of the crimping sleeve, are spring-loaded outward and inserted into the radial channels of the housing equipped with rkhu technological pipe, and the seat of the housing is made below the radial channels in the form of a narrowing of the Central axial channel, the outside of which is placed on the housing a sealing element made with the possibility of tight interaction with the Central channel of the compression sleeve, while the sleeve is equipped with a thickening in the middle and lower and upper ends of reduced diameter, the lower of which interacts from the inside with the support crackers and is tightly inserted into the saddle of the housing, and the upper end of the sleeve from the inside inter operates with a technological branch pipe, above which is equipped with radial holes and a plug provided with a fishing head, and the thickening of the sleeve is made with the possibility of interaction from the inside with support crackers when interacting with an annular selection of the compression sleeve, and longitudinal short and long are made on the outer surface at the top of the technological branch grooves connected from below by a figured groove, wherein a long groove is made up to the edge of the technological branch pipe, while The first tool is made in the form of a pusher connected to the drain device and interacting from above with the catch head of the sleeve, and a nozzle mounted on the follower with the possibility of rotation and axial movement, and also covering the technological branch pipe with the lower part, and the nozzle is equipped with an internal pin interacting with the technological grooves branch pipe with initial installation in a short groove.

The figure 1 in longitudinal section shows a packer for crimping a pipe string.

The figure 2 in longitudinal section shows a fishing tool.

The figure 3 shows a scan of the grooves.

The crimping pipe packer packer 1 comprises a landing tool 2, a drain device 3 made in the form of a cable head with a cable, a cylindrical body 4 with a saddle 5 and a central axial 6 and radial 7 channels connecting the outer space of the housing 4 with its central axial channel 6, installed on the housing 1, the sealing element 9, axially movable and inserted into the housing 4, the sleeve 10 with the supporting crackers 11.

The pipe string 1 below the crimping interval is equipped with a compression sleeve 12, equipped with a calibrated central channel 13 with an inner diameter d smaller than the inner diameter d _{1 of} the pipe string 1, and an annular sample located above with a large longitudinal dimension of the technological joints of the pipe string couplings 1.

The supporting crackers 11 are made with a longitudinal dimension b corresponding to the longitudinal dimension L of the ring sample 14 of the crimping sleeve 12, and are spring-loaded outwardly by means of spring plates 15 and inserted into the radial channels 7 of the housing 4, equipped with a process pipe 16 on top.

The saddle 5 of the housing 4 is made below the radial channels 7 in the form of a narrowing of the Central axial channel 6, outside of which on the housing 4 there is a sealing element 9 made with the possibility of tight interaction with the Central channel 13 of the compression sleeve 12

The sleeve 10 outside is equipped with a bulge 17 in the middle part and the lower 18 and upper 19 ends of a reduced diameter. The lower end of the reduced diameter 18 of the sleeve 10 from the inside interacts with the supporting crackers 11 and is tightly inserted into the saddle 5 of the housing 4.

The upper end of the reduced diameter 19 of the sleeve 10 from the inside interacts with the technological pipe 16, above which is equipped with radial holes 20 and a plug 21. The plug 21 is equipped with a fishing head 22.

The thickening 17 in the middle part of the sleeve 10 is made with the possibility of interaction from the inside with the supporting crackers 11 when they interact with the ring sample 14 of the crimping sleeve 12.

On the outer surface at the top of the technological pipe 16, longitudinal short 23 and long 24 grooves are connected, connected at the bottom by a figured groove 25. A long groove 24 is made to the edge of the technological pipe 16, while the landing tool 2 is made in the form of a pusher 26 connected to the drain device 3 and interacting on top with the fishing head 22 of the sleeve 10, and the pipe 27 mounted on the pusher 26 with the possibility of rotation and axial movement, as well as covering the lower part of the technological pipe 27.

The pipe 27 is equipped with an internal pin 28 that interacts with the grooves 23, 24, 25 of the technological pipe 16 with the initial installation in a short groove 23.

The packer for crimping the pipe string works as follows.

The compression sleeve 12 (see figure 1) is installed in the pipe string 1 in the interval of its crimping, after which the pipe string 1 is lowered into the well.

Prepare the packer for descent into the pipe string 1. To do this, install the inner pin 28 of the process pipe 27 (see figure 3) in the longitudinal short groove 23 of the process pipe 16.

Next, the packer assembly is lowered into the pipe string 1 on the cable (not shown in Figs. 1, 2, 3), as shown in Fig. 1. During the descent of the packer, the support crackers 11, spring-loaded outward by means of spring plates 15, are in contact with the internal the walls of the pipe string 1.

During the descent of the packer into the pipe string 1, the pusher 26 of the landing tool 2 acts on top of the fishing head 22 of the sleeve 10, while the lower end of the reduced diameter 18 of the sleeve 10 acts on the inside of the support crackers 11 inserted into the radial channels 7 of the housing 4, which in turn cause axial movement of the housing 4. In addition, the support crackers 11 center the packer during its descent into the pipe string 1 and landing.

During the descent, the packer reaches the compression sleeve 12 of the pipe string 1, while the sealing element 9 (see Fig. 1) mounted on the outer surface of the cylindrical body 4 seals into contact with the calibrated central channel 13 with the inner diameter d of the compression sleeve 12.

The descent of the packer is continued, while the support crackers 11 come out of contact with the inner wall of the pipe string 1 and fall into the ring sample 14 of the compression sleeve 12, since the longitudinal dimension b of the support crackers 11 is smaller than the longitudinal size L of the ring sample 14 of the support sleeve 12. In the ring sample 14 support clutch 12 spring-loaded outwardly by means of spring plates 15, support crackers 11 radially expand.

As a result, the sleeve 10 moves downward and with a thickening 17 made in the middle part of the sleeve 10, enters into the support crackers 11, while the upper end of the reduced diameter 19 of the sleeve 10 also shifts downward, and the radial holes 20 of the sleeve 10 are hermetically sealed by the process pipe 16.

The unloading of the packer with the landing tool 2 and the drain device 3 onto the fishing head 22 is continued, while the support crackers 11, which are in contact with the ring sample 14 of the compression sleeve 12, abut against the lower end of the ring sample 14 of the compression sleeve 12. The descent is stopped.

Then, the drain device 3 is lifted upward with the landing tool 2 made in the form of a pusher 26 connected to the process pipe 27, while the internal pin 28 installed in the process pipe 27, together with the above-mentioned parts, moves upward and from the figured groove 25 enters a long groove 24 (see FIG. 3), along which, moving up, it leaves the long groove 24 of the process pipe 16.

Next, the drain device 3 with the landing tool 2, made in the form of a pusher 26 connected to the process pipe 27 and the inner pin 28, is removed from the pipe string 1.

The pipe string 1 is filled with process fluid and crimped. After crimping according to the approved work plan, the pressure in the pipe string 1 is vented.

To extract the packer into the pipe string 1, the fishing tool 28 (see FIG. 2) of any known construction, for example, an outer tube, is lowered. Grab hold of fishing head 22.

Raise the fishing head 22, and therefore the sleeve 10, while the radial holes 20 of the sleeve 10 come out of tight interaction with the process pipe 16 and communicate over- and sub-packer spaces, and the sleeve is lifted with little effort, since the outer diameter of the sleeve 10 is small compared to the outer diameter of the housing 4.

As a result, the liquid flows from top to bottom through the radial holes 20 and the central hole of the sleeve 10. The packer is held in a raised position for a certain time until the pressures equalize above and below the packer and then the packer is completely removed from the pipe string 1.

The proposed packer allows crimping in columns of pipes of small diameter, and a decrease in the metal consumption of the structure leads to savings in material and financial resources for its manufacture.

Claims (1)

A packer for crimping a pipe string containing a landing tool, a drain device, a cylindrical body with a saddle on the inner surface and a central axial and radial channels connecting the outer space of the body with its central axial channel, a sealing element mounted on the body, axially movable and inserted into sleeve housing with supporting crackers, characterized in that the pipe string below the crimping interval is equipped with a crimping sleeve equipped with a calibrated central channel with an inner diameter smaller than the inner diameter of the pipe string, and an annular sample located above with a large longitudinal dimension of the technological joints of the pipe string couplings, and support crackers made with a longitudinal size corresponding to the longitudinal dimension of the ring sample of the crimping sleeve are spring-loaded outward and inserted into radial channels case, equipped with a technological pipe on top, and the seat of the body is made below the radial channels in the form of a narrowing of the Central axial channel, outside of which a sealing element is arranged on the housing, which is capable of tightly interacting with the central channel of the crimping sleeve, while the sleeve is equipped externally with a thickening in the middle part and lower and upper ends of a reduced diameter, the lower of which interacts with the support crackers from the inside and is hermetically inserted into the saddle of the housing, and the upper end of the sleeve interacts from the inside with the process pipe, above which is equipped with sequentially radial holes and a plug equipped with a fishing rod dexterity, and the thickening of the sleeve is made with the possibility of interaction from the inside with the support crackers when they interact with the annular selection of the crimping sleeve, and on the outer surface at the top of the process pipe, longitudinal short and long grooves are connected, connected at the bottom by a curly groove, the long groove being made to the edge of the process pipe while the landing tool is made in the form of a pusher connected to a drain device and interacting from above with the catch head of the sleeve, and pa a tube mounted on the pusher with the possibility of rotation and axial movement, as well as covering the lower part of the technological pipe, and the pipe is equipped with an internal pin that interacts with the grooves of the technological pipe with the initial installation in a short groove.

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