CN116181267A

CN116181267A - Eccentric sleeve catcher

Info

Publication number: CN116181267A
Application number: CN202111435056.6A
Authority: CN
Inventors: 闫占辉; 于雷; 戚勇; 董纹希; 王林; 孙凯; 李东; 付尧; 肖昌; 赵鹏飞; 张依; 王树; 安泽典; 吕春柳; 孙宏伟
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2023-05-30

Abstract

The invention discloses an eccentric sleeve catcher which comprises a central tube, wherein the bottom of the central tube is connected with a tension claw for grabbing a fish roof, the upper part of the tension claw is positioned in a liquid cylinder sleeve when the tension claw is folded, and the liquid cylinder sleeve is connected to the outer wall of the central tube in a sliding manner. The lower part of the central tube is provided with a limiting diameter-reducing structure, and a liquid-stopping steel ball is arranged at the limiting diameter-reducing position. The central tube is provided with a liquid flowing port for flowing the pressurized liquid into the liquid cylinder sleeve. The top of the central tube is connected with a lifting nipple. The top of the lifting nipple is provided with an upper coupling, and the lower part of the lifting nipple is provided with a righting body. The catcher has the advantages of wide application range, simple operation, operation cost saving, economic benefit increasing and capability of effectively recovering the fish tops which deviate seriously.

Description

Eccentric sleeve catcher

Technical Field

The invention relates to the technical field of workover operation, in particular to an eccentric sleeve catcher.

Background

As the field develops into the middle and later stages, the production casing of the well is often damaged. If the damaged position of the sleeve is not deep, sleeve changing and well repairing operations are often adopted, namely, a new sleeve is put in to replace the damaged sleeve. However, during the well-repairing operation of the casing, such as the well-flushing operation during casing milling, the stratum is eroded, so that the lower fish tops deviate from the track of the well bore seriously, and the fish tops are lost, so that the prior art cannot repair the well.

As shown in fig. 1, the well is being repaired with broken casing removed. The fish roof was 51/2 "casing collar (103.98 m)", which was severely deviated from the borehole centerline. The well uses a milling pipe with phi 219mm to find out the fish, and can descend to 130m; the fish is found by using a phi 280mm milling tube, and can descend to 110m. The fish roof cannot be retrieved by two searches. The calculated center line of the fish roof deviates from the center line 254mm of the well bore, the inner side of the fish roof deviates from the center line 162.81mm of the well bore, and half of the inner diameter of the surface casing is 159mm, namely the fish roof has deviated from the original well bore track seriously.

Currently, there is no effective repair method for such wells, and repair is generally abandoned, thereby causing significant economic loss. There is therefore an urgent need for a means of retrieving fish tops through which to retrieve lower casing, repairing such wells.

Disclosure of Invention

The invention aims to provide an eccentric sleeve catcher which has the advantages of wide application range, simplicity in operation, capability of saving operation cost and increasing economic benefit, and capability of effectively recovering a fish roof which is seriously deviated.

In order to achieve the above purpose, the application provides an eccentric sleeve catcher, which comprises a central tube, wherein the bottom of the central tube is connected with a tension claw for grabbing a fish roof, the upper part of the tension claw is positioned in a liquid cylinder sleeve when the tension claw is folded, and the liquid cylinder sleeve is in sliding connection with the outer wall of the central tube.

Furthermore, the lower part of the central tube is provided with a limiting diameter-reducing structure, and a liquid stopping steel ball is arranged at the limiting diameter-reducing position.

Further, a liquid flowing port is formed in the central tube and used for flowing pressurized liquid into the liquid cylinder sleeve.

Further, the top of the central tube is connected with a lifting nipple.

Further, the top of the lifting nipple is provided with an upper coupling, and the lower part of the lifting nipple is provided with a righting body.

Further, the outer diameter of the righting body is matched with the inner diameter of the surface sleeve.

Further, the top and the bottom of the column body of the righting body are provided with guide angles.

Further, the upper collar is connected to the wellhead through tubing.

Further, the tension claws are elastic reinforcing ribs and are circumferentially uniformly arranged.

Furthermore, the outer wall of the central tube is provided with a boss structure, the boss structure is concavely provided with a mounting groove, and the mounting groove is provided with a sealing ring in sliding contact with the hydraulic cylinder sleeve.

Furthermore, the inner wall of the hydraulic cylinder sleeve is provided with a boss structure, the boss structure is concavely provided with a mounting groove, and the mounting groove is provided with a sealing ring in sliding contact with the central tube.

Further, when the eccentric sleeve catcher does not go out of the surface sleeve during descending, the tension claw slides downwards against the inner wall of the surface sleeve.

Further, after the eccentric sleeve catcher descends out of the surface sleeve, the tension claw slides downwards against the inner wall of the open hole section.

Further, when the eccentric sleeve catcher descends to the depth of the fish roof, the eccentric sleeve catcher continues to descend until the tension claw is inserted into the fish roof, at the moment, the central pipe is blocked, a certain pressure is kept on the fish roof, then the oil pipe starts to be pressed, the hydraulic cylinder sleeve descends, the tension claw is folded, and the severely deviated sleeve can be pulled back along with the recovery of the tension claw.

As a further alternative, another tubing or drill string is run down, over the fish roof and into the casing interior, thereby holding the fish roof and lifting the eccentric casing trap.

Compared with the prior art, the technical scheme adopted by the invention has the advantages that: (1) application scope is wide: the eccentric sleeve catcher can modify the expansion size and elasticity of the tension claw to adapt to different well conditions. Therefore, the extension range of the tension claw is large, the fish is easy to grasp, and the fish is pulled back.

(2) The operation is simple: the eccentric sleeve catcher has no complex operation, is very easy to catch the deviated sleeve, and can complete the folding action by pressing the oil pipe.

(3) The operation cost is saved, and the economic benefit is increased: after the eccentric sleeve catcher is used, the abandoned oil-water well can be repaired again, so that the production is restored in advance, and the economic benefit is increased.

Drawings

FIG. 1 is a schematic diagram of a well bore configuration of a case well in the background art;

FIG. 2 is a schematic illustration of an eccentric sleeve catcher;

FIG. 3 is a diagram showing two states of an eccentric sleeve catcher;

FIG. 4 is a view of the eccentric sleeve catcher in a surface sleeve;

FIG. 5 is a view of the eccentric sleeve trap in an open hole section;

FIG. 6 is a state diagram of the tension claw inserted into the fish roof;

FIG. 7 is a state diagram of the sleeve when pulled back;

FIG. 8 is a schematic view of a small-sized tubing inserted;

FIG. 9 is a schematic view of the wellbore construction after the eccentric sleeve trap has been tripped out.

The serial numbers in the figures illustrate: 1-coupling; 2-righting body; 3-a central tube; 4-a liquid cylinder sleeve; 5-a sealing ring; 6-stopping liquid steel balls; 7-tension claws.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the application, i.e., the embodiments described are merely some, but not all, of the embodiments of the application. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in fig. 2-3, the present embodiment provides an eccentric sleeve catcher, which comprises a lifting nipple and a central tube which are connected, wherein the top of the lifting nipple is provided with an upper coupling 1, and the upper coupling is connected to the bottom of an oil pipe; a centralizing body 2 is arranged at the lower part of the lifting nipple, and the centralizing body 2 can enable the catcher to be positioned at the central line position of the well bore; the bottom of the central tube is connected with a tension claw for grabbing a fish roof, the tension claw 7 can be elastic steel bars with the diameter phi 10mm (can be adjusted according to actual use conditions) and are uniformly distributed on the circumference, the upper end of the tension claw 7 is welded with the central tube, and the lower part of the tension claw has certain rigidity and elasticity and is used for grabbing a fish; after the liquid stopping steel ball 6 is put in, the central pipe is plugged, then the oil pipe is pressed, under the action of hydraulic pressure, liquid flows into the liquid cylinder sleeve through the liquid flowing port, at the moment, the liquid cylinder sleeve 4 descends, the external tension claw is folded into the inside, the eccentric fish is pulled back by the tension claw, when the liquid cylinder sleeve descends to the bottom dead center, the descending is stopped, and the action is ended.

The use method of the eccentric sleeve catcher comprises the following steps:

s1, slowly lowering an eccentric sleeve catcher into a surface sleeve through an oil pipe;

s2, when the eccentric sleeve catcher descends and does not go out of the surface sleeve, the tension claw is restrained by the surface sleeve and slides downwards tightly against the inner wall of the surface sleeve, as shown in fig. 4;

s3, after the eccentric sleeve catcher passes through the surface sleeve in a descending manner, the tension claw slides downwards to be clung to the inner wall of the open hole section, as shown in fig. 5;

s4, the eccentric sleeve catcher continues to descend, and as the fingers of the tension claw are uniformly distributed circumferentially, the fish tops can be detected in all directions. Descending to the depth of the fish roof, continuing descending until the tension claw is inserted into the fish roof at the lower part, wherein the pipe column is blocked, and the suspension weight is obviously reduced, as shown in fig. 6;

s5, keeping a certain pressure on the fish roof, then throwing the liquid stopping steel ball into the central tube, starting to press the oil pipe, descending the hydraulic cylinder sleeve, gathering the tension claw, and pulling the severely deviated sleeve back along with the recovery of the tension claw, as shown in fig. 7;

s6, another oil pipe or drill string with small size is put in, passes through the fish roof and enters the inside of the casing, as shown in fig. 8, so that the fish roof is fixed, and the catcher is lifted out, as shown in fig. 9;

s7, performing subsequent sleeve tieback operation.

The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. The eccentric sleeve catcher is characterized by comprising a central tube, wherein the bottom of the central tube is connected with a tension claw for grabbing a fish roof, the upper part of the tension claw is positioned in a liquid cylinder sleeve when the tension claw is folded, and the liquid cylinder sleeve is slidably connected to the outer wall of the central tube.

2. The eccentric sleeve catcher as claimed in claim 1, wherein the lower portion of the central tube is provided with a limiting diameter-reducing structure, and a liquid-stopping steel ball is arranged at the limiting diameter-reducing position.

3. An eccentric sleeve catcher as claimed in claim 1 or 2, wherein the central tube is provided with a fluid outlet for flowing pressurized fluid into the cylinder liner.

4. The eccentric sleeve catcher as claimed in claim 1, wherein a lifting nipple is connected to the top of the center tube.

5. The eccentric sleeve catcher as claimed in claim 4, wherein the lifting nipple is provided with an upper coupling at the top and a centralizer at the lower portion.

6. The eccentric sleeve retainer of claim 5 wherein said centralizer outer diameter matches said surface sleeve inner diameter.

7. The eccentric sleeve catcher as claimed in claim 5, wherein the top and bottom of the body are provided with guide angles.

8. The eccentric sleeve trap of claim 5 wherein said upper collar is connected to a wellhead by tubing.

9. The eccentric sleeve catcher as in claim 1, wherein said tension jaws are resilient steel bars and are circumferentially uniformly arranged.

10. The eccentric sleeve catcher as claimed in claim 1, wherein the outer wall of the central tube is provided with a boss structure which is concavely provided with a mounting groove, and the mounting groove is provided with a sealing ring in sliding contact with the hydraulic cylinder sleeve.

11. The eccentric sleeve catcher as claimed in claim 1, wherein the inner wall of the cylinder housing is provided with a boss structure, the boss structure is concavely provided with a mounting groove, and the mounting groove is provided with a sealing ring in sliding contact with the central tube.

12. The eccentric sleeve retainer of claim 1 wherein said tension pawl slides downwardly against the inner wall of the skin sleeve when the eccentric sleeve retainer is not in the skin sleeve condition.

13. The eccentric sleeve retainer of claim 12 wherein said tension jaws slide downwardly against the inner wall of the open hole section as the eccentric sleeve retainer is lowered out of the surface sleeve.

14. The eccentric sleeve catcher of claim 13, wherein when the eccentric sleeve catcher descends to the depth of the fish roof, the eccentric sleeve catcher continues to descend until the tension claw is inserted into the fish roof, at which time the central tube is blocked, a certain pressure is maintained on the fish roof, then the oil pipe is started to be pressed, the hydraulic cylinder sleeve descends, the tension claw is folded, and the severely deviated sleeve is pulled back along with the recovery of the tension claw.

15. An eccentric sleeve catcher as claimed in claim 14, wherein another tubing or drill string is run down past the fish roof and into the interior of the sleeve, thereby holding the fish roof and lifting the eccentric sleeve catcher.