A high-efficiency integrated tool for internal and external well fishing

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By designing an integrated tool for efficient internal and external retrieval of fish in wells, and combining a hydraulic system with various components, a stable gripping mechanism for fish that have fallen into the well has been achieved. This solves the problem that existing tools cannot retrieve fish from both inside and outside the well simultaneously, thereby improving retrieval efficiency and reducing costs.

CN224515152UActive Publication Date: 2026-07-17GUIZHOU GAOFENG GASOLINEEUM MACHINERY

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: GUIZHOU GAOFENG GASOLINEEUM MACHINERY
Filing Date: 2025-09-22
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

Existing fishing tools only have a single internal or external fishing function, which cannot effectively catch fish that have fallen down the well, resulting in frequent tripping in and out of the well, increasing costs and reducing drilling efficiency.

Method used

A highly efficient integrated tool for internal and external fishing in downhole was designed. Combining the internal and external fishing structures of the hydraulic system, it achieves simultaneous internal and external fishing through components such as slip outer cylinder, transmission outer cylinder, and fishing male cone. The hydraulic system drives the transmission rod and spring to achieve stable grasping of fish that have fallen into the well.

Benefits of technology

It improved the success rate of salvage operations, reduced the frequency of drilling and tripping, saved manpower and resources, shortened the drilling and production cycle, reduced oil drilling and production costs, and improved drilling and production efficiency.

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Abstract

This utility model discloses a highly efficient integrated tool for internal and external fishing in wells. The outer cylinder of the slip is connected to a transmission outer cylinder and a guide shoe at both ends. An upper connector is connected to the top of the transmission outer cylinder. A spiral slip is installed inside the outer cylinder. A transmission rod and a fishing male cone are installed in the mounting cavity of the upper connector and the inner hole of the transmission outer cylinder. A spring I is sleeved on the transmission rod, and a spring II is sleeved on the fishing male cone. The lower end of the fishing male cone has an external thread and a spline groove. A boss is located in the inner hole of the transmission outer cylinder and engages with the spline groove. A nozzle is installed at the upper end of the inner hole of the transmission rod. This tool integrates internal and external fishing structures, which increases the probability of successfully retrieving fish from the well in a single run, greatly reducing the frequency of frequent tripping due to fishing failures. It provides a new tool for oil and gas drilling and fishing, significantly saving oil drilling costs and improving drilling efficiency.

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Description

Technical Field

[0001] This utility model relates to an efficient integrated tool for internal and external retrieval in downhole operations, belonging to the technical field of oil and gas field development equipment. Background Technology

[0002] With the increasing demand for energy, many complex oilfields have entered the mid-to-late stages of development, with wells becoming deeper and the working environment of oil and gas wells becoming more complex. Prolonged drilling and production operations inevitably lead to varying degrees of damage or breakage of drilling tools downhole, causing drilling and production to halt. At this point, efficient fishing tools are needed to quickly retrieve the fish that have fallen into the well. Existing fishing tools only have a single external or internal retrieval function. Since the outer surface of the fish downhole often has less wear or is irregular, the tool cannot grasp and hold the fish securely, resulting in retrieval failure. This necessitates multiple tripping of drill strings to assemble other sizes of fishing tools, which increases the cost of oil drilling and production, wastes significant manpower and resources, and reduces drilling efficiency.

[0003] With the development of new technologies, in order to effectively retrieve fish that have fallen into wells, accelerate the pace of oil extraction operations, and reduce oil production costs, it is necessary to provide an integrated tool for efficient internal and external retrieval of fish from wells. Utility Model Content

[0004] The purpose of this invention is to provide a highly efficient integrated tool for both internal and external fishing in wells. This tool integrates a structural design that allows for simultaneous internal and external fishing of fish. This design increases the success rate of retrieving fish from the well in a single run, significantly reducing the frequency of tripping in and out of the well due to fishing failures. It provides a completely new tool for oil and gas drilling and fishing, greatly saving oil drilling costs and improving drilling efficiency, thus overcoming the shortcomings of existing technologies.

[0005] The technical solution of this utility model: A highly efficient integrated tool for internal and external retrieval in wells, comprising a slip outer cylinder, a transmission outer cylinder and a guide shoe respectively connected to the upper and lower ends of the slip outer cylinder, an upper connector connected to the top of the transmission outer cylinder, a spiral slip installed in the inner spiral groove of the slip outer cylinder, the spiral slip having an internal thread on its inner surface, and a T-shaped hollow transmission rod and a retrieval male cone installed from top to bottom in the mounting cavity of the upper connector and the inner hole of the transmission outer cylinder, wherein a spring I is sleeved on the transmission rod, and the two ends of the spring I are respectively The top surface of the transmission rod abuts against the stepped surface of the transmission rod and the top surface of the retrieval cone. The top surface of the transmission rod abuts against the upper bottom surface of the mounting cavity. A spring II is sleeved on the retrieval cone. The two ends of the spring II abut against the stepped surface of the retrieval cone and the lower bottom surface of the mounting cavity, respectively. The lower end of the retrieval cone is a cone structure with gradually decreasing size. The cone structure is provided with external threads. The outward protrusion of the upper end of the retrieval cone is provided with a spline groove. A boss is provided in the inner hole of the transmission outer cylinder. The boss is inserted into the spline groove. A nozzle is installed in the upper end of the inner hole of the transmission rod.

[0006] In the aforementioned integrated tool for efficient internal and external retrieval in wells, a centralizing sleeve and a limiting ring are respectively installed in the countersunk holes at the upper and lower ends of the outer cylinder of the slip. The upper end face of the centralizing sleeve abuts against the lower end face of the transmission outer cylinder, and the lower end face of the limiting ring abuts against the upper end face of the guide shoe.

[0007] In the aforementioned integrated tool for efficient internal and external retrieval in wells, the upper and lower ends of the slip outer cylinder are respectively threaded to a transmission outer cylinder and a guide shoe, the top of the transmission outer cylinder is threaded to an upper connector, and the upper end of the upper connector has an internal thread.

[0008] In the aforementioned integrated tool for efficient internal and external retrieval in downhole, the upper end of the inner hole of the transmission rod is a countersunk structure, in which a nozzle is installed. The wall of the countersunk structure is provided with a sealing groove and a limiting groove. An O-ring is provided in the sealing groove, and an elastic retaining ring is provided in the limiting groove to block the nozzle. A sealing groove is also provided on the outer periphery of the enlarged part at the head end of the transmission rod, and an O-ring is provided in the sealing groove.

[0009] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model provides a highly efficient integrated tool for both internal and external well fishing. This tool integrates a structural design that allows for simultaneous fishing from both inside and outside the well. The internal fishing structure utilizes a hydraulic system for power, resulting in a simple structure, convenient operation, improved fishing speed and efficiency, and high safety and reliability. This structural design increases the probability of successfully retrieving fish from the well in a single run, significantly reducing the frequency of frequent tripping due to fishing failures, avoiding waste of manpower and resources, achieving energy conservation and consumption reduction. It provides a brand-new tool for oil and gas drilling and fishing, greatly saving oil drilling and production costs and shortening the drilling cycle. It can be widely used in major oilfields across China. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the structure of a fish falling into a well.

[0012] Reference numerals: 1-Upper connector, 2-Transmission rod, 3-Elastic retaining ring for hole, 4-Nozzle, 5-Spring I, 6-Outer transmission cylinder, 7-Retrieving male cone, 8-Spring II, 9-Outer cylinder of slip, 10-Straightening sleeve, 11-Spiral slip, 12-Limiting ring, 13-Guiding shoe, 14-O-ring, 15-Boss. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0014] An embodiment of this utility model: A highly efficient integrated tool for internal and external retrieval in wells includes a slip outer cylinder 9, with a transmission outer cylinder 6 and a guide shoe 13 connected to its upper and lower ends respectively. An upper connector 1 is connected to the top of the transmission outer cylinder 6. A spiral slip 11 is installed in the inner spiral groove of the slip outer cylinder 9, and the inner surface of the spiral slip 11 is provided with internal threads. The lower inner hole of the upper connector 1 has an enlarged diameter, while the lower inner hole of the transmission outer cylinder 6 has a reduced diameter. When the upper connector 1 and the transmission outer cylinder 6 are connected together, the lower inner hole of the upper connector 1 and the upper inner hole of the transmission outer cylinder 6 form an installation cavity. A T-shaped, hollow transmission rod 2 and a retrieval tool are installed from top to bottom in this installation cavity. The male cone 7 has a spring I5 sleeved on the outer circumference of the small diameter portion of the transmission rod 2. The two ends of the spring I5 abut against the stepped surface of the transmission rod 2 and the top surface of the retrieval male cone 7, respectively. The top surface of the transmission rod 2 abuts against the upper bottom surface of the mounting cavity. The small diameter portion of the retrieval male cone 7 has a spring II8 sleeved on the outer circumference of the small diameter portion of the retrieval male cone 7. The two ends of the spring II8 abut against the stepped surface of the retrieval male cone 7 and the lower bottom surface of the mounting cavity, respectively. The lower end of the retrieval male cone 7 is a cone structure with gradually decreasing size. The cone structure has external threads. The large diameter portion of the upper end of the retrieval male cone 7 has a spline groove. The inner hole of the transmission outer cylinder 6 has a boss 15 extending along its length direction. The boss 15 is inserted into the spline groove. The upper end of the inner hole of the transmission rod 2 is fitted with a nozzle 4.

[0015] A straightening sleeve 10 and a limiting ring 12 are respectively installed in the countersunk holes at the upper and lower ends of the outer cylinder 9 of the slip. The upper end face of the straightening sleeve 10 abuts against the lower end face of the transmission outer cylinder 6, and the lower end face of the limiting ring 12 abuts against the upper end face of the guide shoe 13. The limiting ring 12 is used to limit and fix the spiral slip 11. The straightening sleeve 10 is to ensure that the head cone part (i.e., the working part 2) of the male cone 7 can smoothly enter the fish dropping hole after it moves downward.

[0016] The upper and lower ends of the outer cylinder 9 are respectively threaded to the transmission outer cylinder 6 and the guide shoe 13. The top end of the transmission outer cylinder 6 is threaded to the upper connector 1. The upper end of the upper connector 1 is provided with an internal thread, which can realize the quick connection and disassembly between components.

[0017] The upper end of the inner hole of the transmission rod 2 is a countersunk hole structure, in which a nozzle 4 is installed. The wall of the countersunk hole structure is provided with a sealing groove and a limiting groove. An O-ring 14 is provided in the sealing groove, and an elastic retaining ring 3 is provided in the limiting groove to block the nozzle 4, thereby limiting and fixing the nozzle 4. Two sealing grooves are also provided on the outer periphery of the enlarged part at the head end of the transmission rod 2. Both sealing grooves are provided with O-rings 14. By providing O-rings 14 on the inner hole and outer periphery of the transmission rod 2, it is ensured that the hydraulic medium can pass through the nozzle 4.

[0018] The assembly process of this utility model is as follows:

[0019] 1: Insert the spiral slip 11 into the inner spiral groove of the slip outer cylinder 9, and insert the keyed end of the limiting ring 12 into the slip outer cylinder 9; then thread the guide shoe 13 to the end of the slip outer cylinder 9 where the limiting ring 12 is placed, and tighten it.

[0020] 2: Insert the straightening sleeve 10 into the empty slot of the outer cylinder 9 of the slip, and then connect the male end of the transmission outer cylinder 6 to the threaded connection of the outer cylinder 9 of the slip and tighten it.

[0021] 3: Install spring II8 onto the outer circle of the step of the salvage male cone 7 with the small end facing inward, and then align and assemble the spline groove of the salvage male cone 7 and the boss 15 of the transmission outer cylinder 6.

[0022] 4: Install the O-ring 14 into the inner hole and outer circle of the transmission rod 2 respectively, install the nozzle 4 into the inner hole of the transmission rod 2, install the elastic retaining ring 3 into the inner hole groove of the transmission rod 2, and install the spring I5 into the outer circle of the step of the transmission rod 2.

[0023] 5: Insert the assembled transmission rod 2 with the larger end facing inward into the stepped hole of the upper connector 1, and then connect the assembled upper connector 1 and the transmission outer cylinder 6 by thread and tighten them.

[0024] The working principle of this utility model:

[0025] This tool consists of an outer retrieval section and an inner retrieval section. The outer retrieval working part 1 (i.e., the inner surface of the spiral slip 11) of the outer retrieval section has an internal sawtooth thread, and the inner retrieval working part 2 (i.e., the cone mechanism of the retrieval male cone 7) of the inner retrieval section has an external sawtooth thread. This tool is specifically used to retrieve fish with smooth outer diameters and holes in the well, such as drill collars, drill pipes, connectors, and drilling tools. After a fish falls into the well, the upper connector 1 of this tool is connected to the threaded downhole retrieval string. The drill string is lowered above the fish, and then the tool is slowly rotated and lowered to guide the fish into the working part 1 of the tool. Due to the interaction between the wide sawtooth internal thread of the slip outer cylinder 9 and the external thread of the spiral slip 11, the expansion and contraction of the spiral slip 11 are constrained, thus allowing the fish to enter the spiral slip 11 and be held tightly. Then the retrieval string is lifted. If the suspended weight increases, it proves that the fish has been caught, and the outer retrieval is complete. However, when the outer surface of the fish that falls into the well has very little wear or irregular wear, the working part 1 of the spiral slip 11 will not be able to grab and hold the fish, resulting in the failure of the retrieval. At this point, continue to slowly lower the tool into the centering sleeve 10. The purpose is to ensure that the working part 2 of the retrieval cone 7 can smoothly enter the fish-falling hole. Then, water is injected into the wellhead. Under the action of the nozzle 4, the pressure inside the tool increases, and the pressure generates kinetic energy, causing the transmission rod 2 to move downward. At this time, the spring I 5 is compressed. When the transmission rod 2 moves downward, it pushes the retrieval cone 7 to move downward at the same time. At this time, the spring II 8 is also compressed. When the working part 2 of the retrieval cone 7 enters the fish-falling hole, the tool is slowly rotated. Since the transmission outer cylinder 6 and the retrieval cone 7 are connected by a spline, the retrieval cone 7 rotates simultaneously. Its working part 2 makes a connection with the fish-falling hole. Gradually and steadily apply pressure and rotate to make the connection. When the formed connection can withstand a certain tension and torque, stop injecting water. The pressure inside the tool decreases, and the transmission rod 2 moves upward under the action of the spring I 5, returning to the initial state. At this time, lift the retrieval column. If the suspended weight increases, it proves that the fish has been caught, and the internal retrieval is completed.

Claims

1. A downhole efficient internal and external fishing integrated tool, characterized in that: The device includes a slip outer cylinder (9), with a transmission outer cylinder (6) and a guide shoe (13) connected to its upper and lower ends respectively. The transmission outer cylinder (6) is connected to an upper connector (1) at its top. A spiral slip (11) is installed in the inner spiral groove of the slip outer cylinder (9). The inner surface of the spiral slip (11) is provided with an internal thread. A T-shaped, hollow transmission rod (2) and a retrieval cone (7) are installed from top to bottom in the mounting cavity of the upper connector (1) and the inner hole of the transmission outer cylinder (6). A spring I (5) is sleeved on the transmission rod (2), and the two ends of the spring I (5) abut against the platform of the transmission rod (2). The top surface of the step surface and the top surface of the retrieval cone (7), the top surface of the transmission rod (2) abuts against the upper bottom surface of the mounting cavity, the retrieval cone (7) is fitted with a spring II (8), the two ends of the spring II (8) abut against the step surface of the retrieval cone (7) and the lower bottom surface of the mounting cavity respectively, the lower end of the retrieval cone (7) is a cone structure with gradually decreasing size, the cone structure is provided with external threads, the upper end of the retrieval cone (7) is provided with a spline groove, the inner hole of the transmission outer cylinder (6) is provided with a boss (15), the boss (15) is inserted into the spline groove, and the upper end of the inner hole of the transmission rod (2) is fitted with a nozzle (4).

2. The downhole high-efficiency internal-external fishing integrated tool according to claim 1, characterized in that: A straightening sleeve (10) and a limiting ring (12) are respectively installed in the countersunk holes at the upper and lower ends of the outer cylinder (9). The upper end face of the straightening sleeve (10) abuts against the lower end face of the transmission outer cylinder (6), and the lower end face of the limiting ring (12) abuts against the upper end face of the guide shoe (13).

3. The downhole high-efficiency internal-external fishing integrated tool according to claim 1, characterized in that: The upper and lower ends of the outer cylinder (9) are respectively threaded to the transmission outer cylinder (6) and the guide shoe (13). The top end of the transmission outer cylinder (6) is threaded to the upper connector (1), and the upper end of the upper connector (1) is provided with an internal thread.

4. The downhole high-efficiency internal-external fishing integrated tool according to claim 1, characterized in that: The upper end of the inner hole of the transmission rod (2) is a countersunk hole structure, in which a nozzle (4) is installed. The wall of the countersunk hole structure is provided with a sealing groove and a limiting groove. An O-ring (14) is provided in the sealing groove, and an elastic retaining ring (3) is provided in the limiting groove to block the nozzle (4). A sealing groove is also provided on the outer periphery of the enlarged part at the head end of the transmission rod (2), in which an O-ring (14) is provided.