CN219840611U

CN219840611U - Fishing device used in well

Info

Publication number: CN219840611U
Application number: CN202321300165.1U
Authority: CN
Inventors: 周怡君; 陈晨; 杜林�; 苏镖; 王毅; 庞文峰
Original assignee: China Petroleum and Chemical Corp; Sinopec Southwest Oil and Gas Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Southwest Oil and Gas Co
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-10-17
Anticipated expiration: 2033-05-26

Abstract

The utility model belongs to the field of oil and gas drilling and completion and reservoir transformation, and particularly discloses a salvaging device used in a well. The fishing device comprises a fishing joint; the salvaging mechanism comprises a first salvaging barrel, a spring claw and a second salvaging barrel sleeved outside the first salvaging barrel and the spring claw, wherein at least one sliding groove is formed in the periphery of the first salvaging barrel, and the limiting mechanism comprises a first pin and a second pin, wherein the free end of the first pin stretches into the sliding groove, and the free end of the second pin is connected with the first salvaging barrel. Wherein the latch is configured to form a snap-fit with the downhole tool, and the second overshot is configured to shear the second pin under the influence of the upper tool and move axially to the upstream end of the chute guided by the first pin such that the latch is in engagement with the second overshot. The device can be used for effectively clamping the downhole tool, so that falling off in the lifting process is avoided.

Description

Fishing device used in well

Technical Field

The utility model relates to the field of oil and gas drilling and completion and reservoir reconstruction, in particular to a salvaging device used in a well.

Background

Fishing tools are common tools used in downhole operations. Among the various well servicing operations, the fishing operation occupies a significant portion of the overall operation. In addition, there are a wide variety of downhole junks, such as pipe junks, rod junks, string junks, downhole tool junks, and the like.

The production process in the pit can be seriously affected by the underground junk, so that corresponding fishing tools are designed and manufactured for the characteristics of different junks to carry out fishing operation. Currently, the fishing tool of the prior art throws away the following problems. Firstly, the fishing tool adopts steel wire operation and does not have a flushing function, so that the falling object cannot be flushed in advance, and the success rate of fishing is reduced. Secondly, the fishing tool does not have a soluble function, so that the fishing tool is very easy to catch and can not be released in the process of lowering or fishing, thereby causing serious shaft accidents.

Disclosure of Invention

The utility model aims to provide a fishing device used in a well, which can effectively clamp a downhole tool so as to avoid falling off in the lifting process. In addition, the utility model can release the card by injecting the dissolving agent after the underground card so as to reduce the possibility of causing the well bore accident. In addition, the utility model has simple structure, convenient operation and high safety.

According to the present utility model there is provided a fishing device for use in a well comprising a fishing sub for connection to an upper tool; a fishing mechanism disposed downstream of the fishing joint, the fishing mechanism comprising a first overshot, a collet extending axially from a downstream end of the first overshot, and a second overshot sleeved outside the first overshot and the collet and connected to the fishing joint, wherein at least one chute is provided on an outer circumference of the first overshot, and a limiting mechanism extending radially inwardly through the first overshot, the limiting mechanism comprising at least one first pin and at least one second pin, wherein a free end of the first pin protrudes into the chute, and in an initial state, a free end of the second pin is connected to the first overshot at a downstream end of the chute, wherein the collet is configured to form a snap-fit with a downhole tool, the second overshot is configured to shear the second pin under the influence of the upper tool, and move axially up to the chute by guiding the first pin so that the collet forms an engagement with the first collet.

In one embodiment, a plurality of through slots are provided on the outer circumference of the second overshot, which are adapted to the size of the jaws, allowing the jaws to expand outwards.

In one embodiment, a guide step extending obliquely radially inward is provided on the inner surface of the second overshot at a position connected to the downstream end of the passageway, allowing the collet to retract inward.

In one embodiment, the elastic claws are provided with a plurality of elastic claws which are uniformly distributed along the circumferential direction, and the elastic claws are configured to be capable of expanding outwards in the radial direction to move into the through groove and then contracting inwards through the guide steps so as to form clamping connection with the downhole tool.

In one embodiment, the latch includes a first connection portion configured in a rod shape, and a second connection portion configured in a barb shape, wherein a portion of the first connection portion near the second connection portion is wider than a portion near the first overshot.

In one embodiment, a radially inwardly extending limiting step is provided on the inner surface of the second overshot, the limiting step being arranged downstream of the guiding step and being capable of abutment with the second connection part.

In one embodiment, the fishing device for use in a well includes a flushing nozzle disposed within the first overshot for ejecting fluid from upstream.

In one embodiment, the first overshot, the collet, and the flushing nozzle are all made of a dissolvable magnesium aluminum alloy.

In one embodiment, the first overshot is configured as a hollow sleeve, and in an initial state the upstream end of the first overshot is in abutment with the downstream end of the fishing joint.

In one embodiment, the fishing device is lowered into the well through a coiled tubing or wireline.

Compared with the prior art, the utility model has the advantages that: the utility model can effectively clamp the downhole tool, thereby avoiding falling off in the lifting process. In addition, the utility model can release the card by injecting the dissolving agent after the underground card so as to reduce the possibility of causing the well bore accident. In addition, the utility model has simple structure, convenient operation and high safety.

Drawings

The utility model will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 schematically illustrates the construction of a fishing device for use in a well according to the present utility model;

FIG. 2 is a cross-sectional view at A-A of FIG. 1;

FIG. 3 is a cross-sectional view at B-B in FIG. 1;

FIG. 4 is a cross-sectional view taken at C-C of FIG. 1;

FIG. 5 is a schematic view of a first condition of a fishing device for use in a well according to the present utility model, showing the open condition of the jaws;

FIG. 6 is a schematic view of a second condition of the fishing device for use in a well according to the present utility model, showing the retracted condition of the jaws.

In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.

Detailed Description

The utility model will be further described with reference to the accompanying drawings. For ease of understanding, in this specification, the directional term "upstream" or the like refers to a direction closer to the wellhead, i.e., the top direction in fig. 1. The directional term "downstream" or the like is used to refer to a direction away from the wellhead, i.e., the direction of the bottom end in fig. 1.

Fig. 1 schematically shows the structure of a fishing device 100 for use in a well according to the present utility model. As shown in fig. 1, a fishing apparatus 100 for use in a well according to the present utility model generally includes a fishing mechanism 20. The fishing mechanism 20 includes a first overshot 21, a collet 22, and a second overshot 23. Wherein the first overshot 21 is configured as a hollow sleeve and is arranged inside the second overshot 23. The fingers 22 are configured to extend axially from the downstream end of the first overshot 21 and are also disposed inside the second overshot 23. The second overshot 23 is configured as a hollow sleeve and is sleeved outside the first overshot 21, that is to say the inner surface of the second overshot 23 is in abutment with the outer surface of the first overshot 21.

The fishing apparatus 100 for use in a well according to the present utility model further includes a fishing sub 10. The fishing joint 10 is provided upstream of the fishing mechanism 20, and the upstream end of the fishing joint 10 is connected to the upper tool, and the downstream end of the fishing joint 10 is fixedly connected to the upstream end of the second overshot 23. In this way, the fishing joint 10 and the fishing mechanism 20 can move axially under the drive of the upper tool in the subsequent fishing process, thereby completing the underground fishing operation.

Fig. 2 is a cross-sectional view at A-A in fig. 1. According to one embodiment of the utility model, as shown in fig. 1 and 2, at least one slide groove 211 is provided on the outer circumference of the first overshot 21. In this way, the fishing joint 10 and the second overshot 23 can be moved axially within the chute 211 by the guiding of the first pin 31 (described below), further bringing the collet 22 into a stable engagement with the second overshot 23. The contents of which are described below.

Fig. 3 is a cross-sectional view at B-B in fig. 1. According to the present utility model, as shown in FIGS. 1 and 3, the fishing apparatus 100 for use in a well further includes a limiting mechanism 30. The limiting mechanism 30 is configured to extend radially inward through the first overshot 21 and includes a first pin 31 and a second pin 32.

According to one embodiment of the utility model, the second pin 32 is provided with at least one, and the free end of the second pin 32 is fixedly connected to the first overshot 21 at the downstream end of the chute 211. In this way, in the initial state, the first overshot 21 and the second overshot 23 can be always in a fixedly connected state. In the above state, the upstream end of the first overshot 21 is attached to the downstream end of the fishing joint 10.

According to one embodiment of the utility model, the first pin 31 is provided with at least one, and the free end of the first pin 31 can extend into the slide slot 211. In this way, after shearing the second pin 32 by the upper tool, the fishing joint 10 and the second overshot 23 can be moved axially to the upstream end of the chute 211 by the guiding of the first pin 31, further bringing the collet 22 into a stable engagement with the second overshot 23. The contents of which are described below.

Fig. 4 is a cross-sectional view at C-C in fig. 1. According to the present utility model, as shown in fig. 1 and 4, a plurality of through grooves 231 are provided on the outer circumference of the second overshot 23, and the size and number of the through grooves 231 are matched with those of the elastic claws 22. In this way, the through slots 231 can allow the fingers 22 to expand outwardly when the fishing apparatus 100 used in a well is gripping the downhole tool 50. Specifically, during the lowering of the fishing apparatus 100 for use in a well, the fingers 22 continue to move downstream, thereby making contact with the downhole tool 50 and squeezing, and the fingers 22 move radially outward into the through slots 231 after being squeezed.

According to the present utility model, as shown in FIG. 1, a fishing apparatus 100 for use in a well includes a guide step 232. The guide step 232 is configured to be disposed obliquely extending radially inward from the inner surface of the second overshot 23, and is at the junction of the inner surface of the second overshot 23 and the downstream end of the through slot 231. In this way, the guide steps 232 can allow the fingers 22 to retract inwardly when the fishing apparatus 100 used in a well is gripping the downhole tool 50. Specifically, after the collet 22 enters the through-slot 231 according to the gripping process described above, the collet 22 continues to move downstream, and the collet 22 is retracted inwardly by the guide steps 232 to perform a reset operation, thereby forming a preliminary snap-fit with the downhole tool 50.

According to the present utility model, as shown in FIG. 1, the fishing apparatus 100 for use in a well further includes a limiting step 233. The restricting step 233 is configured to be capable of extending and disposing radially inward from the inner surface of the second overshot 23, and the restricting step 233 is disposed downstream of the guiding step 232. In addition, the radially inward thrust exerted by the limit step 233 on the collet 22 is equal to the radially outward thrust exerted by the downhole tool 50 on the collet 22. Thereby, the collet 22 forms an effective snap-fit with the downhole tool 50 at the limiting step 233 in the second overshot 23, further ensuring stability of the fishing device 100 for use in a well during lifting.

According to one embodiment of the utility model, the fingers 22 are provided in plurality and are evenly distributed circumferentially at the downstream end of the first overshot 21. In this manner, the gripping area of the collet 22 with the downhole tool 50 is effectively increased, enabling the fishing apparatus 100 for use in a well to more easily grip the downhole tool 50 in the well. In one embodiment of the utility model, the spring fingers 22 may be made of a dissolvable magnesium aluminum alloy depending on the requirements of the fishing operation. Therefore, when the well is blocked in the salvaging operation and can not be released, the special dissolving liquid can be injected to release the blocking, so that the possibility of causing the well bore accident is reduced.

According to the present utility model, as shown in fig. 1, the spring claw 22 includes a first connection portion 221 and a second connection portion 222. Wherein the first connection part 221 is configured in a rod-shaped structure and the second connection part 222 is configured in a barb-shaped structure. In this way, the fishing apparatus 100 used in the well is capable of more easily expanding the fingers 22 radially outward to find a suitable gripping location during gripping of the downhole tool 50, and the fingers 22 are more easily capable of forming a stable gripping action with the downhole tool 50 during inward contraction.

According to one embodiment of the utility model, the portion of the first connection 221 close to the second connection 222 is wider than the portion of the first connection 221 close to the first overshot 21. This provides for better expansion of the fingers 22 and thus easier outward movement by the downhole tool 50.

In accordance with one embodiment of the present utility model, as shown in FIG. 1, the fishing apparatus 100 for use in a well further includes a flushing nozzle 40. A flushing nozzle 40 is provided in the first overshot 21 and is capable of ejecting liquid from upstream during the lowering process to flush the downhole tool 50 to be fished, thus facilitating the subsequent fishing operation. In one embodiment of the utility model, the rinse nozzle 40 may be made of a dissolvable magnesium aluminum alloy depending on the requirements of the fishing operation. Therefore, when the well is blocked in the salvaging operation and can not be released, the special dissolving liquid can be injected to release the blocking, so that the possibility of causing the well bore accident is reduced.

The working process of the utility model comprises the following steps:

first, the fishing apparatus 100 for use in a well is assembled and then lowered into the well by coiled tubing or wireline operation. The first pin 31 at this time is at the downstream end of the chute 211.

Then, when the fishing apparatus 100 for use in a well contacts the downhole tool 50, the upper tool continues to be depressed, as shown in fig. 5, and the fingers 22 expand outwardly into the through slots 231 under the action of the downhole tool 50.

After that, when the head 51 of the downhole tool 50 passes over the second connecting portion 222, the spring claw 22 is retracted inwards to reset, and the spring claw 22 forms a preliminary clamping connection with the downhole tool 50.

Finally, the second pin 32 is sheared by lifting up the fishing sub 10 and the second overshot 23, the fishing sub 10 and the second overshot 23 being moved by the first pin 31 to the upstream end of the chute 211, while the collet 22 and the downhole tool 50 form a stable snap-fit at the limiting step 233 in the second overshot 23, as shown in fig. 6.

It is readily understood that the run-in mode of coiled tubing or wire operations need to be reasonably selected according to the needs of the actual fishing operation. The flushing nozzle 40 is typically installed when running coiled tubing into the fishing apparatus 100 for use in a well.

The present utility model provides a fishing apparatus 100 for use in a well that is capable of effectively clamping a downhole tool 50 to avoid falling out during lifting. In addition, the utility model can release the card by injecting the dissolving agent after the underground card so as to reduce the possibility of causing the well bore accident. In addition, the utility model has simple structure, convenient operation and high safety.

The above is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto. Modifications and variations may readily be made by those skilled in the art within the scope of the present disclosure, and such modifications and variations are intended to be included within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims

1. A fishing device for use in a well, comprising:

a fishing joint (10) for connection with an upper tool;

a fishing mechanism (20) arranged at the downstream of the fishing joint (10), the fishing mechanism (20) comprising a first overshot (21), a latch (22) extending axially from the downstream end of the first overshot (21), and a second overshot (23) sleeved outside the first overshot (21) and the latch (22) and connected with the fishing joint (10), wherein at least one chute (211) is arranged on the outer circumference of the first overshot (21), and

a limiting mechanism (30) extending radially inwards through the first overshot (21), the limiting mechanism (30) comprising at least one first pin (31) and at least one second pin (32), wherein a free end of the first pin (31) protrudes into the chute (211) and in an initial state the free end of the second pin (32) is connected with the first overshot (21) at a downstream end of the chute (211),

wherein the latch (22) is configured to form a snap-fit with a downhole tool (50), the second overshot (23) is configured to shear the second pin (32) under the influence of the upper tool and move axially to the upstream end of the chute (211) guided by the first pin (31) such that the latch (22) is in engagement with the second overshot (23).

2. Fishing device in a well according to claim 1, characterized in that a number of through slots (231) adapted to the size of the jaws (22) are provided on the outer circumference of the second overshot (23) allowing the jaws (22) to expand outwards.

3. Fishing device in a well according to claim 2, characterized in that a guiding step (232) extending obliquely radially inwards is provided on the inner surface of the second overshot (23) at a position connected to the downstream end of the through slot (231), allowing the jaws (22) to retract inwards.

4. A fishing device for use in a well according to claim 3, wherein the fingers (22) are provided in a plurality and all circumferentially evenly distributed, the fingers (22) being configured to be able to expand radially outwardly into the through slots (231) and then retract inwardly past the guide steps (232) to form a snap fit with the downhole tool (50).

5. A fishing device for use in a well according to claim 4, characterised in that the latch (22) comprises a first connection part (221) configured as a rod and a second connection part (222) configured as a barb, wherein the part of the first connection part (221) adjacent to the second connection part (222) is wider than the part adjacent to the first overshot (21).

6. Fishing device for use in a well according to claim 5, characterised in that a limiting step (233) extending radially inwards is provided on the inner surface of the second overshot (23), which limiting step (233) is arranged downstream of the guiding step (232) and can abut the second connection part (222).

7. A fishing device for use in a well according to claim 6, characterised in that the fishing device for use in a well comprises a flushing nozzle (40) arranged in the first overshot (21) for ejecting liquid from upstream.

8. Fishing device in a well according to claim 7, characterized in that the first overshot (21), the jaws (22) and the flushing nozzle (40) are all made of a dissolvable magnesium aluminium alloy.

9. A fishing device for use in a well according to any one of claims 1 to 3, characterised in that the first overshot (21) is configured as a hollow sleeve and in an initial state the upstream end of the first overshot (21) is in abutment with the downstream end of the fishing joint (10).

10. A fishing device for use in a well according to any of claims 1 to 3, wherein the fishing device is lowered into the well by means of a coiled tubing or a wireline.