Hydraulic casing collar locator

Abstract

The utility model discloses a kind of hydraulic casing coupling collet positioner, including positioner body, the middle part of positioner body is sleeved in sleeve, multiple through positioning block assembly hole positions are equipped on the middle part wall surface of sleeve, multiple positioning block slot positions are equipped on the middle part outer wall surface of positioner body, positioning block assembly hole position and positioning block slot position mutually face each other, positioning block is equipped in positioning block slot position, the inner wall surface of each positioning block is equipped with multiple inner holes, spring is equipped in the inner hole, spring is abutted on the outer wall surface of positioner body, piston is inserted in the lower part inboard of sleeve, the upper inner wall surface of piston and the lower part outer wall surface of positioning block mutually adhere, the lower end of positioner body is connected with lower joint, the bottom inner wall surface of piston and the upper part outer wall surface of lower joint mutually adhere, and start shear pin is equipped between the two, ball seat is equipped in lower joint, shear sleeve is equipped between the upper part outer wall surface of ball seat and lower joint inner wall surface, release shear pin is equipped between shear sleeve and ball seat.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas well drilling and workover technology, and in particular to a hydraulic casing coupling positioner. Background Technology

[0002] In the later stages of oil and gas well production, casing leakage may occur, requiring targeted replacement of the leaking casing. Initially, the location of the leak is identified through tubing string testing. Subsequently, a casing reversal tool is installed for precise reversal, necessitating a hydraulic casing coupling locator for accurate positioning.

[0003] Currently, the commonly used mechanical casing coupling positioner, when used with the casing reversing tool, may encounter obstruction or the upper casing mechanical reversing tool may prematurely open the anchored casing, which may lead to the failure of the casing reversing operation. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic sleeve coupling positioner.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A hydraulic sleeve coupling positioner includes a positioner body, the middle part of which is fitted inside a sleeve. The middle wall of the sleeve has multiple through-holes for locating blocks, and the outer wall of the middle part of the positioner body has multiple slots for locating blocks. The locating block holes and slots are aligned with each other. A locating block is installed in each slot, and each locating block has multiple inner holes on its inner wall. A spring is installed in each inner hole and abuts against the outer wall of the positioner body. A piston is inserted into the lower inner side of the sleeve, and the upper inner wall of the piston is in contact with the lower outer wall of the locating block. The lower end of the positioner body is connected to a lower connector, and the bottom inner wall of the piston is in contact with the upper outer wall of the lower connector, with a starting shear pin between them. A ball seat is installed inside the lower connector, and a shearing sleeve is installed between the upper outer wall of the ball seat and the inner wall of the lower connector. A release shear pin is installed between the shearing sleeve and the ball seat, and a steel ball is installed inside the ball seat.

[0007] The upper part of the sleeve is connected to the outer wall of the positioner body by a first set screw.

[0008] The piston's upper inner wall surface is in contact with the outer wall surface of the positioner body, and a second O-ring is provided at the contact point between the two.

[0009] The piston's lower inner wall surface is in contact with the outer wall surface of the positioner body, and a third O-ring is provided at the contact point between the two.

[0010] A second set screw is provided between the bottom outer wall surface of the locator body and the inner wall surface of the lower connector.

[0011] The bottom outer wall of the locator body is in contact with the inner wall of the lower connector, and a fourth O-ring is provided at the contact point between the two.

[0012] A first O-ring is provided between the outer wall of the middle part of the ball seat and the inner wall of the lower connector.

[0013] Compared with the prior art, the outstanding advantages of this utility model are:

[0014] (1) In view of the special working conditions of casing reverse coupling operation, in the hydraulic casing coupling locator of this utility model, the positioning block is in the retracted state when it is in the well and does not contact the casing before operation; the locator assembly is designed with a ball-throwing seat that can be knocked down, so that after the casing reverse coupling tool string is lowered to the designated leak point position, the piston of the locator is opened after the ball is thrown and pressurized in the tubing string, so that the positioning block pops out to perform coupling positioning, and completes the subsequent casing reverse coupling operation, reducing the risk of obstruction and making the casing reverse coupling operation more reliable and safe.

[0015] (2) The hydraulic sleeve coupling positioner of this utility model avoids the risk of obstruction that may occur with mechanical coupling positioners by starting the positioner hydraulically; the shear pin controls the starting pressure, and the number of shear pins and the corresponding shearing value can be adjusted at any time according to the on-site operation; the positioner integrates a knock-down ball seat, which is more economical and practical; the structure is simple and reliable to operate, and convenient for later maintenance.

[0016] The hydraulic sleeve coupling positioner of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the hydraulic sleeve coupling positioner of this utility model.

[0018] Figure 2 This is a half-section diagram of the locator body.

[0019] Figure 3 for Figure 2 The “AA” view in the middle.

[0020] Figure 4 This is a half-section diagram of the sleeve.

[0021] Figure 5 for Figure 4 The "BB" view in the middle.

[0022] Figure 6 This is a cross-sectional view of the positioning block.

[0023] Figure 7 for Figure 6 The "CC" view.

[0024] The components are as follows: 1. Positioner body; 2. Sleeve; 3. Positioning block; 4. Spring; 5. Piston; 6. Starting shear pin; 7. Lower connector; 8. Shear sleeve; 9. Release shear pin; 10. Ball seat; 11. First O-ring; 12. Second O-ring; 13. Third O-ring; 14. Fourth O-ring; 15. First set screw; 16. Second set screw; 17. Steel ball. Detailed Implementation

[0025] like Figure 1-7 As shown (where Figure 1 (The left side represents the top, and the right side represents the bottom). A hydraulic sleeve coupling positioner includes a positioner body 1, the middle part of which is fitted inside a sleeve 2. The middle wall of the sleeve 2 has six through-holes for positioning blocks, and the outer wall of the middle part of the positioner body 1 has six slots for positioning blocks. The positioning holes and slots are directly opposite each other. Positioning blocks 3 are installed in the slots, and each positioning block 3 has three inner holes on its inner wall. A spring 4 is installed in each inner hole and abuts against the positioner body 1. On the outer wall surface, a piston 5 is inserted into the lower inner side of the sleeve 2. The upper inner wall surface of the piston 5 is in contact with the lower outer wall surface of the positioning block 3. The lower end of the positioning body 1 is connected to the lower connector 7. The bottom inner wall surface of the piston 5 is in contact with the upper outer wall surface of the lower connector 7, and a starting shear pin 6 is provided between them. A ball seat 10 is provided inside the lower connector 7. A shear sleeve 8 is provided between the upper outer wall surface of the ball seat 10 and the inner wall surface of the lower connector 7. A release shear pin 9 is provided between the shear sleeve 8 and the ball seat 10. A steel ball 17 is provided inside the ball seat 10.

[0026] A first O-ring 11 is provided between the outer wall of the middle part of the ball seat 10 and the inner wall of the lower connector 7. Steps are provided at both the upper and lower ends of the positioning block 3, and the middle part of the positioning block 3 protrudes outward.

[0027] The upper part of the sleeve 2 is connected to the outer wall of the positioner body 1 by the first set screw 15.

[0028] The upper inner wall of piston 5 is in contact with the outer wall of positioner body 1, and a second O-ring 12 is provided at the contact point between the two. The lower inner wall of piston 5 is in contact with the outer wall of positioner body 1, and a third O-ring 13 is provided at the contact point between the two.

[0029] A second set screw 16 is provided between the bottom outer wall surface of the positioner body 1 and the inner wall surface of the lower connector 7. The bottom outer wall surface of the positioner body 1 and the inner wall surface of the lower connector 7 are in contact with each other, and a fourth O-ring 14 is provided at the contact part between the two.

[0030] The specific assembly method of this hydraulic sleeve coupling positioner is as follows:

[0031] (1) Insert the sleeve 2 into the right end of the locator body 1, tighten the threaded connection and align it with the assembly hole and slot of the locating block, and then install the first set screw 15.

[0032] (2) Install springs 4 in the inner holes of the six positioning blocks 3 respectively, and then install the whole assembly into the corresponding slots of the positioning body 1;

[0033] (3) Compress the six positioning block springs 4, and then insert the piston 5 from the right end of the positioning body 1 so that the piston fits into the six positioning blocks and is limited to the right end of the sleeve.

[0034] (4) Slide the shear sleeve 8 onto the left end of the ball seat 10 and assemble the release shear pin 9, then insert the whole assembly into the inner hole from the left end of the lower connector 7.

[0035] (5) Then connect the lower connector 7 to the positioner body 1 by thread and tighten it, and install the starting shear pin 6 and the second set screw 16.

[0036] The working principle of this hydraulic sleeve coupling positioner is as follows:

[0037] After the hydraulic casing coupling locator is lowered into the designated position in the wellbore along with the tool string, the ball is dropped into the steel ball 17 and placed in the ball seat 10; the inside of the casing is pressurized, the piston 5 moves downward under the action of internal pressure, shears off the starting shear pin 6, the outer circle of the positioning block 3 loses its constraint, and under the reset force of the spring 4, the positioning block 3 is pushed outward to contact the casing.

[0038] In the free state, the steps at both ends of the positioning block 3 are blocked by the sleeve 2 and the piston 5;

[0039] The hydraulic casing coupling locator moves up and down with the casing string at a designated position. The change in the suspended weight of the casing string is observed until the locating block 3 enters the target casing coupling. The inside of the casing string is pressurized until the upper anchor of the casing string is completely anchored to the target casing under hydraulic action. The inside of the casing string is pressurized again to shear and release the shear pin 9. The steel ball 17 is knocked down with the ball seat 10 and falls into the screen tube at the lower end of the casing string, thereby realizing the connection between the inner and outer casing strings, and then proceeding to the next step of casing reverse buckling operation.

[0040] The working process of this hydraulic sleeve coupling positioner is as follows:

[0041] (1) The ball is thrown from the tubular column onto the steel ball seat;

[0042] (2) When the inside of the tubing is pressurized, the piston descends and shears off the starting shear pin. Under the action of the spring, the positioning block opens and contacts the sleeve:

[0043] (3) The inside of the tubing is pressurized, and the anchor at the upper end of the tubing is anchored to the target casing under the action of internal pressure;

[0044] (4) Pressurize the inside of the tube column again, cut off the release pin, and the steel ball is knocked down along with the ball seat into the screen tube at the lower end of the tube column.

[0045] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. They should not be construed as limitations on the present utility model. Any modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A hydraulic sleeve coupling positioner, characterized in that: The device includes a locator body (1), the middle part of which is fitted inside a sleeve (2). The sleeve (2) has multiple through-holes on its middle wall and multiple slots on its outer wall. The mounting holes and slots are directly opposite each other. A locator block (3) is located within each slot. Each locator block (3) has multiple inner holes on its inner wall, and a spring (4) is located within each inner hole. The spring (4) abuts against the outer wall of the locator body (1). A piston is inserted into the lower inner side of the sleeve (2). (5) The upper inner wall of the piston (5) is in contact with the lower outer wall of the positioning block (3). The lower end of the positioning body (1) is connected to the lower connector (7). The bottom inner wall of the piston (5) is in contact with the upper outer wall of the lower connector (7), and a starting shear pin (6) is provided between them. A ball seat (10) is provided in the lower connector (7). A shear sleeve (8) is provided between the upper outer wall of the ball seat (10) and the inner wall of the lower connector (7). A release shear pin (9) is provided between the shear sleeve (8) and the ball seat (10). A steel ball (17) is provided in the ball seat (10).

2. The hydraulic sleeve coupling positioner according to claim 1, characterized in that: The upper part of the sleeve (2) is connected to the outer wall of the positioner body (1) by the first set screw (15).

3. The hydraulic sleeve coupling positioner according to claim 2, characterized in that: The inner wall surface of the upper middle part of the piston (5) is in contact with the outer wall surface of the positioner body (1), and the contact part of the two is provided with a second O-ring (12).

4. The hydraulic sleeve coupling positioner according to claim 3, characterized in that: The lower inner wall of the piston (5) is in contact with the outer wall of the positioner body (1), and the contact part of the two is provided with a third O-ring (13).

5. The hydraulic sleeve coupling positioner according to claim 4, characterized in that: A second set screw (16) is provided between the bottom outer wall surface of the positioner body (1) and the inner wall surface of the lower connector (7).

6. The hydraulic sleeve coupling positioner according to claim 5, characterized in that: The bottom outer wall of the locator body (1) is in contact with the inner wall of the lower connector (7), and the contact part of the two is provided with a fourth O-ring (14).

7. The hydraulic sleeve coupling positioner according to claim 6, characterized in that: A first O-ring (11) is provided between the outer wall of the middle part of the ball seat (10) and the inner wall of the lower connector (7).

Images