Combined fishing device

Abstract

The utility model provides a combined type salvaging device which comprises a gap bridge pipe and a salvaging mechanism which is concentrically arranged in the gap bridge pipe and used for salvaging falling objects in a well, the falling objects in the well comprise rod-shaped falling objects and tubular falling objects, the salvaging mechanism comprises a first salvaging piece used for salvaging the rod-shaped falling objects, and a second salvaging piece used for salvaging the tubular falling objects. And the second fishing piece is arranged below the first fishing piece and is used for fishing the tubular fish.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas field drilling, in particular to a combined fishing device. Background Art

[0002] At present, salvage tools are the most widely used special tools in oilfield drilling and well repair operations. According to the type of objects in the well, salvage tools are divided into five categories: rod salvage tools, pipe salvage tools, cable salvage tools, logging instrument salvage tools, and small object salvage tools.

[0003] Therefore, there are many types of salvage tools and the process technology is mature, but the following problems still exist: First, since the fish dropping channel downhole is relatively complicated, and when the situation of the fish top (i.e., the sucker rod or the oil pipe) is unclear, a lead-printed pipe string is usually assembled first, and then a suitable salvage drill tool is selected according to the lead print, so at least two processes are required, thereby increasing the operation time and cost; second, the traditional salvage tool can only salvage one type of fish when the pipe string is lowered, resulting in low salvage efficiency.

[0004] Therefore, it is desirable in the art to provide a combined salvaging device to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a combined salvaging device, which effectively integrates a first salvaging component with a second salvaging component, thereby being able to salvage two types of fish at the same time during a single lowering process, that is, achieving simultaneous salvaging of the pumping rod and the oil pipe.

[0006] According to the utility model, a combined salvaging device is provided, comprising a bridge pipe and a salvaging mechanism which is concentrically arranged in the bridge pipe and is used to salvage objects dropped in a well.

[0007] Wherein, the fallen objects in the well include rod-shaped fallen fish and tubular fallen fish, and the salvaging mechanism includes a first salvaging piece for salvaging the rod-shaped fallen fish, and a second salvaging piece arranged below the first salvaging piece and used for salvaging the tubular fallen fish.

[0008] In one embodiment, the first fishing piece includes a first canister and a joint disposed above the first canister.

[0009] In one embodiment, at least one pair of loose-leaf clamping plates for clamping with the rod-shaped fish dropper are provided on the upper end surface of the first fishing tube.

[0010] In one embodiment, an end of the joint remote from the first canister is connected to a drilling tool.

[0011] In one embodiment, the second fishing element includes a second fishing tube, and a slip disposed in the second fishing tube and used to form a locking connection with the tubular fish drop.

[0012] In one embodiment, a plurality of the slips are arranged along the circumference of the second canister.

[0013] A key groove for abutting against the tubular fish drop is provided at the bottom of the slip, and a plurality of the key grooves form an annular structure allowing the rod-shaped fish drop to pass through when the slips abut against each other.

[0014] In one embodiment, a conical slope is formed on the inner wall of the second scoop tube, and the cava has a corresponding shape that can abut against the conical slope, wherein the tubular fish can move upward under the push of the drilling tool, and the cava is prompted to expand outwards and then contract inwards to hold the tubular fish.

[0015] In one embodiment, a locking portion for biting the tubular fish is provided on the inner wall of the slip, and the locking portion is composed of a plurality of left-handed sawtooth screw threads arranged at intervals.

[0016] In one embodiment, the second fishing piece also includes a guide body arranged below the second fishing tube, a control ring arranged on the upper end surface of the guide body and adapted to the keyway, and a milling shoe arranged on the lower end surface of the guide body and used for trimming the tubular fish drop, wherein a packing for forming a sealed connection with the tubular fish drop is provided in the control ring.

[0017] In one embodiment, a passage is formed in the first fishing tube for allowing the rod-shaped fish to pass through, and the second fishing element further includes a guide tube fixed to the top end of the second fishing tube and axially aligned with the passage.

[0018] Compared with the prior art, the advantages of the utility model are:

[0019] Firstly, the utility model can perform salvage work when the fallen objects in the well (rod-shaped fish or tubular fish) are uncertain. In other words, the utility model can salvage two kinds of fish at the same time during one lowering process by effectively integrating the first salvage component with the second salvage component, that is, it can salvage the sucker rod and the oil pipe at the same time, thereby effectively avoiding the work of assembling the lead-printed pipe string to determine the fish top, and further reducing the operation time and cost.

[0020] Secondly, the utility model can reduce the number of salvage times, shorten the operation period, and reduce the operation costs to help the efficient development of oil and gas, further achieve cost reduction and efficiency improvement, and is worthy of popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings, in which:

[0022] Figure 1 The structure of the combined salvaging device according to the utility model is schematically shown.

[0023] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0024] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0025] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0026] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0027] For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] The utility model will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 The structure of the combined salvaging device 100 according to the present invention is schematically shown.

[0030] like Figure 1 As shown, the combined salvage device 100 according to the present invention mainly includes a bridge pipe (not shown) and a salvage mechanism concentrically arranged in the bridge pipe. Preferably, the salvage mechanism can effectively and accurately salvage objects in the well, so as to further improve the salvage efficiency of the combined salvage device 100.

[0031] In the present invention, the objects dropped in the well include rod-shaped dropping fish (such as sucker rods) and tubular dropping fish (such as oil pipes).

[0032] In one embodiment, the salvage mechanism includes a first salvage piece that can be used to salvage rod-shaped fish and a second salvage piece that can be used to salvage tubular fish. Preferably, the second salvage piece is arranged below the first salvage piece. Therefore, the utility model effectively integrates the first salvage piece with the second salvage piece, so that the combined salvage device 100 can salvage two types of fish at the same time during a single lowering process, that is, it can salvage the pumping rod and the oil pipe at the same time, which is described below.

[0033] According to the utility model, if Figure 1 As shown, the first fishing piece includes a first overshot tube 22. Preferably, a passage 221 is formed in the first overshot tube 22, which allows only rod-shaped fish to pass through. Therefore, the first overshot tube 22 can not only guide the rod-shaped fish to move upward, but also limit the movement path of the tubular fish (i.e., the tubular fish abuts against the first overshot tube 22), so as to help improve the accuracy and efficiency of the combined fishing device 100.

[0034] In one embodiment, Figure 1 As shown, at least one pair of loose-leaf clamps 23 are provided at the upper end surface of the first scoop 22. Preferably, when the combined fishing device 100 is matched with a rod-shaped fish, the entire device is lowered by a drilling tool (described below) to make the rod-shaped fish move upward until the top of the rod-shaped fish pushes open the loose-leaf clamps 23 and enters the joint 24 (described below) to the greatest extent.

[0035] Preferably, the combined salvaging device 100 is lifted by the drilling tool to force the rod-shaped fish to move downward, and at the same time the loose-leaf clamping plate 23 will be reset, so that the loose-leaf clamping plate 23 will form a firm clamping relationship with the rod-shaped fish during the reset process to facilitate subsequent salvage work.

[0036] In the utility model, since the top of the rod-shaped fish drop usually has a shoulder or a hoop, the rod-shaped fish drop can smoothly push open the loose-leaf card 23 through the shoulder or the hoop when it goes up, and the rod-shaped fish drop can also be clamped with the reset loose-leaf card 23 through the shoulder or the hoop when it goes down.

[0037] In a preferred embodiment, there are two loose-leaf clamping plates 23, and both of the two loose-leaf clamping plates 23 are configured in a semicircular structure. Therefore, after the combined salvaging device 100 is lifted up, the loose-leaf clamping plates 23 will form a firm clamping relationship with the outer wall of the movable pressure clamping plate 23, so as to improve the salvaging efficiency and salvaging quality of the combined salvaging device 100.

[0038] In other embodiments, a plurality of loose-leaf card plates 23 are provided, and the plurality of loose-leaf card plates 23 are all configured into a partial fan-shaped structure. Therefore, after the combined salvaging device 100 is lifted up, the loose-leaf card plates 23 will form a firm clamping relationship with the outer wall of the movable pressure card plate 23, so as to improve the salvaging efficiency and salvaging quality of the combined salvaging device 100.

[0039] Preferably, all the loose-leaf card plates 23 are hinged at the top end of the first canister 22 to further improve the flexibility of the loose-leaf card plates 23. It is worth noting that when all the loose-leaf card plates 23 are reset, the upper end surface of the first canister 22 will be closed.

[0040] In one embodiment, Figure 1 As shown, a joint 24 is provided above the first bailing tube 22. Preferably, the joint 24 is provided above the first bailing tube 22, so that the rod-shaped fish can be guided upward more easily. Therefore, after the combined salvaging device 100 is lifted, the rod-shaped fish will go downward under the action of its own weight, so that the reset loose-leaf clamping plate 23 can more easily form a firm clamping relationship with the rod-shaped fish, so as to facilitate the subsequent salvaging work.

[0041] In one embodiment of the present invention, the end of the joint 24 away from the first scoop 22 is connected to the drilling tool. Therefore, the lifting and lowering actions of the combined salvage device 100 can be directly achieved through the drilling tool, so as to further improve the flexibility and maneuverability of the combined salvage device 100. In the present invention, the bridge pipe can effectively enhance the tensile strength of the combined salvage device 100.

[0042] According to the utility model, if Figure 1 As shown, the second fishing piece includes a second fishing tube 31 and a slip 32 disposed in the second fishing tube 31. Preferably, after the tubular fish enters the second fishing tube 31, the slip 32 can effectively hold the tubular fish tightly to form a firm and stable connection between the two, which is described below.

[0043] Preferably, if Figure 1 As shown, a key groove 33 is provided at the bottom of the cava 32, and in the initial state (i.e. when the cava 32 abuts against each other), a plurality of key grooves 33 will be configured into an annular structure, which can not only axially abut with the tubular fish, but also allow the rod-shaped fish to pass through, so as to help complete the salvaging of the rod-shaped fish through the first salvaging piece.

[0044] Preferably, a conical slope is formed on the inner wall of the second bailing tube 31, and the slips 32 have a corresponding shape that can abut against the conical slope. Therefore, under the action of the tubular fish, the slips 32 can crawl along the conical slope of the second bailing tube 31 to achieve the transition between the expansion state and the contraction state, so as to help complete the bailing of the tubular fish.

[0045] In a specific embodiment of the present invention, a plurality of slips 32 are arranged along the circumference of the second scoop 31, and the cross section of the slips 32 is a partial fan-shaped structure. In the initial state, the plurality of slips 32 abut against each other, and as the tubular fish enters, the plurality of slips 32 will first expand outwards and then contract inwards to successfully hold the tubular fish, thereby completing the scooping of the tubular fish.

[0046] In the present invention, when the combined salvage device 100 is matched with a tubular fish, the whole device is lowered by the drilling tool to make the tubular fish move upward and axially abut against the annular structure formed by multiple key grooves 33, and the tubular fish will continue to move upward. In this process, the slips 32 will crawl upward along the conical slope under the push of the tubular fish and gradually change from a contracted state to an expanded state, and then return from an expanded state to a contracted state, thereby completing the work of holding the tubular fish.

[0047] It is worth noting that when the combined salvage device 100 is lifted up by the drilling tool, on the one hand, the tubular fish is relatively heavy and therefore moves downward relative to the combined salvage device 100; on the other hand, since the inner wall of the second salvage tube 31 is a conical slope, the cava 32 will inevitably move downward along the conical slope. At this time, the cava 32 and the tubular fish will become tighter and tighter, thereby successfully salvaging the tubular fish.

[0048] In one embodiment, a locking portion for biting the tubular fish is provided on the inner wall of the slip 32. Preferably, the locking portion is composed of a plurality of left-handed sawtooth screw teeth arranged at intervals. Generally, the screw teeth have the advantage of being sharp and hard, thereby strengthening the biting force of the slip 32, further improving the firmness between the slip 32 and the tubular fish, and improving the success rate of the combined salvaging device 100.

[0049] In addition, considering the wear of the slips 32 on the tubular fish during the salvaging process, the thread size of each slip 32 is usually within 3 mm below the standard salvaging size.

[0050] Compared with the prior art, the utility model can perform salvage work without determining the fallen objects in the well (rod-shaped fish or tubular fish). In other words, the utility model effectively integrates the first salvage component with the second salvage component, thereby being able to salvage two types of fallen fish at the same time during one lowering process, that is, achieving the simultaneous salvage of the sucker rod and the oil pipe, thereby effectively avoiding the work of assembling the lead-printed pipe string to determine the fish top, and further reducing the operation period and cost.

[0051] In addition, since the second salvaging piece for salvaging tubular fallen fish is located below the first salvaging piece for salvaging rod-shaped fallen fish, the utility model can cope with different situations of fallen objects in the well, that is, it can salvage rod-shaped fallen fish first and then tubular fallen fish, or it can salvage tubular fallen fish first and then rod-shaped fallen fish.

[0052] According to the utility model, if Figure 1 As shown, the second fishing piece further includes a guide body 34 disposed below the second fishing tube 31, and a control ring 35 disposed at the upper end surface of the guide body 34. Preferably, the control ring 35 is adapted to the key slot 33, in other words, the control ring 35 can be inserted into the annular structure formed by a plurality of key slots 33, so as to further constrain the slips 32 to only move up and down but not to rotate.

[0053] In one embodiment, Figure 1 As shown, the second fishing piece further includes a milling shoe 36 disposed at the lower end surface of the guide body 34. Preferably, the milling shoe 36 can mill the top crack and flash edge of the tubular fish to ensure that the tubular fish can smoothly enter the second fishing tube 31.

[0054] Preferably, an R-shaped packing is provided inside the control ring 35 so as to form a sealed connection with the tubular drop fish. Preferably, an O-shaped sealing ring is provided outside the control ring 35 so as to form a sealed connection with the bridge pipe.

[0055] In one embodiment, Figure 1 As shown, a passage 221 for allowing a rod-shaped fish to pass through is formed in the first scoop 22. Preferably, the passage 221 is arranged concentrically with the annular structure formed by a plurality of key grooves 33, so that the rod-shaped fish can enter the joint 24 under the guidance of the annular structure and the passage 221, so as to facilitate subsequent fishing work.

[0056] Compared with the prior art, the advantages of the present invention are:

[0057] Firstly, the utility model can perform salvage work when the fallen objects in the well (rod-shaped fish or tubular fish) are uncertain. In other words, the utility model can salvage two kinds of fish at the same time during one lowering process by effectively integrating the first salvage component with the second salvage component, that is, it can salvage the sucker rod and the oil pipe at the same time, thereby effectively avoiding the work of assembling the lead-printed pipe string to determine the fish top, and further reducing the operation time and cost.

[0058] Secondly, the utility model can reduce the number of salvage times, shorten the operation period, and reduce the operation costs to help the efficient development of oil and gas, further achieve cost reduction and efficiency improvement, and is worthy of popularization and use.

[0059] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A combined salvage device, characterized in that: It comprises a bridge pipe and a salvage mechanism which is concentrically arranged in the bridge pipe and is used for salvaging objects dropped in the well. Wherein, the fallen objects in the well include rod-shaped fallen fish and tubular fallen fish, and the salvaging mechanism includes a first salvaging piece for salvaging the rod-shaped fallen fish, and a second salvaging piece arranged below the first salvaging piece and used for salvaging the tubular fallen fish.

2. The combined salvaging device according to claim 1, characterized in that: The first fishing piece includes a first fishing tube (22) and a joint (24) arranged above the first fishing tube (22).

3. The combined salvaging device according to claim 2, characterized in that: At least one pair of loose-leaf clamping plates (23) for clamping with the rod-shaped fish dropper are provided on the upper end surface of the first scoop tube (22).

4. The combined salvaging device according to claim 3, characterized in that: One end of the joint (24) away from the first bailing tube (22) is connected to the drilling tool.

5. The combined salvaging device according to claim 4, characterized in that: The second fishing element comprises a second fishing tube (31) and a slip (32) arranged in the second fishing tube (31) and used for forming a locking connection with the tubular fish trap.

6. The combined salvaging device according to claim 5, characterized in that: A plurality of slips (32) are arranged along the circumference of the second canister (31). A key groove (33) for abutting against the tubular fish drop is provided at the bottom of the slip (32). When the slips (32) abut against each other, a plurality of key grooves (33) form an annular structure allowing the rod-shaped fish drop to pass through.

7. The combined salvaging device according to claim 6, characterized in that: A conical slope is formed on the inner wall of the second bailing tube (31), and the slip (32) has a corresponding shape that can abut against the conical slope, wherein the tubular fish can move upward under the push of the drilling tool, and the slip (32) is prompted to expand outwards and then contract inwards to hold the tubular fish.

8. The combined salvaging device according to claim 7, characterized in that: A locking portion for biting the tubular fish is provided on the inner wall of the slip (32), and the locking portion is composed of a plurality of left-handed sawtooth screw threads arranged at intervals.

9. The combined salvaging device according to claim 8, characterized in that: The second fishing piece also includes a guide body (34) arranged below the second fishing tube (31), a control ring (35) arranged on the upper end surface of the guide body (34) and adapted to the keyway (33), and a milling shoe (36) arranged on the lower end surface of the guide body (34) and used for trimming the tubular fish drop, wherein a packing for forming a sealed connection with the tubular fish drop is arranged in the control ring (35).

10. The combined fishing device according to any one of claims 2 to 9, characterized in that: A passage (221) is formed in the first scoop tube (22) to allow the rod-shaped fish to pass through.

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