Fishing tool for oil field operation
By improving the materials and structural design of oilfield salvage tools, the problems of insufficient stability and flexibility of traditional tools in complex downhole environments have been solved, enabling efficient and stable downhole salvage operations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGYANG CHENXI OILFIELD ENGINEERING TECHNOLOGY SERVICES CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional oilfield salvage tools have poor stability in complex downhole environments, are difficult to adapt to curved or narrow wells, and pose a risk of slippage, which affects salvage efficiency.
The main rod is made of soft metal material, the moving wheels are designed with anti-slip texture, the spring limit sleeve and the moving rod are matched, the oil-resistant rubber sealing ring and the hydraulic pump and power line control system ensure that the tool moves stably downhole and retrieves accurately.
It improves the flexibility and stability of the retrieval tool in complex downhole environments, prevents slippage, enhances retrieval efficiency and accuracy, prevents oil leakage, and extends tool life.
Smart Images
Figure CN224260298U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oilfield operation technology, specifically to a salvage tool used in oilfield operations. Background Technology
[0002] An oilfield is an underground oil accumulation area with a unified pressure system and oil-water interface, consisting of one or several oil reservoirs. It is an underground oil resource accumulation area formed by geological processes and with unified development conditions. Its scale and management need to comprehensively consider geological, engineering and economic factors. It can be divided into: structural oil and gas fields, stratigraphic oil and gas fields and composite oil and gas fields.
[0003] During oilfield extraction operations, downhole tools and equipment components often fall into the well for various reasons. In such cases, retrieval tools are needed for recovery. Traditional oilfield retrieval tools have a relatively simple structure and poor flexibility, making them difficult to adapt to complex downhole environments. When faced with curved or narrow wells, they cannot smoothly reach the designated location for retrieval operations. Moreover, some retrieval tools have poor mobility and are prone to slipping on the well wall, affecting retrieval efficiency and thus having certain limitations. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] The purpose of this invention is to provide a salvage tool for oilfield operations, in order to solve the problem of poor stability during the salvage process mentioned in the background art.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, this utility model provides the following technical solution: a salvage tool for oilfield operations, comprising a main rod, a power cord fixedly installed at the lower part of the main rod, a control cord fixedly installed at the lower part of the main rod, a spring limiting sleeve fixedly installed on the outer side of the main rod, a movable rod movably installed on the other side of the spring limiting sleeve, movable wheels fixedly installed on both sides of the other end of the movable rod, a threaded rod fixedly installed on the inner side of one movable wheel, a limiting nut movably installed on the outer side of the threaded rod, an installation tube fixedly installed on the upper part of the main rod, a sealing ring fixedly installed on the upper part of the installation tube, a hydraulic pump fixedly installed on the inner side of the installation tube, and a salvage disc fixedly installed on the upper part of the installation tube.
[0008] Preferably, mounting bases are fixedly provided on both sides above the salvage plate, salvage arms are fixedly provided on the mounting bases, and hydraulic rods are fixedly provided between the salvage arms, and the salvage arms are driven by the hydraulic rods.
[0009] Preferably, the main rod is made of a flexible metal material, which allows it to bend more easily when retrieval oil from oil fields in different environments to reach the designated location.
[0010] Preferably, the surface of the movable wheel is provided with anti-slip texture to increase the friction with the oilfield well wall or working surface and prevent the retrieval tool from slipping during movement.
[0011] Preferably, the sealing ring is made of oil-resistant rubber material, and its inner diameter is adapted to the outer diameter of the mounting pipe, so as to tightly fit the mounting pipe and the upper connecting component and prevent oil leakage.
[0012] Preferably, the hydraulic pump is connected to an external power source and control equipment via a power line and a control line to enable power supply and operation control of the hydraulic pump, thereby providing power for the salvage operation.
[0013] Preferably, a compression spring is provided on the inner side of the spring limiting sleeve, and the other end of the compression spring is connected to the movable rod to provide the restoring elastic force of the movable rod.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] 1. This retrieval tool for oilfield operations effectively increases friction with the well wall or working surface by setting anti-slip patterns on the surface of the moving wheels. Combined with the cooperation of the spring limit sleeve and the moving rod, the retrieval tool is more stable during movement and less prone to slippage, ensuring the smooth progress of retrieval operations and improving retrieval efficiency.
[0016] 2. This retrieval tool for oilfield operations, with its main rod made of flexible metal material, can bend flexibly in complex downhole environments, adapt to wellbore shapes of different shapes, and successfully reach the designated location, greatly improving the applicability and flexibility of the retrieval tool;
[0017] 3. This retrieval tool for oilfield operations uses an oil-resistant rubber material and a sealing ring that is compatible with the outer diameter of the installation pipe. This seals the installation pipe tightly with the upper connecting parts, effectively preventing oil leakage, protecting the downhole environment, and avoiding potential damage to the retrieval tool itself due to oil leakage, thus extending the tool's service life.
[0018] 4. This salvage tool for oilfield operations achieves precise power transmission and control through the connection of the hydraulic pump with the power and control lines. Combined with the design of the salvage arm and hydraulic rod, the movement of the salvage arm can be flexibly adjusted according to different salvage needs, thereby improving the accuracy and reliability of salvage operations. Attached Figure Description
[0019] Figure 1This is a three-dimensional structural diagram of the present invention;
[0020] Figure 2 This is a three-dimensional structural diagram of the spring limiting sleeve of this utility model;
[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the main rod of this utility model;
[0022] Figure 4 This is a three-dimensional structural diagram of the retrieval plate of this utility model.
[0023] In the diagram: 1. Main rod; 2. Power cord; 3. Control cord; 4. Spring limit sleeve; 5. Movable rod; 6. Moving wheel; 7. Threaded rod; 8. Limit nut; 9. Mounting tube; 10. Sealing ring; 11. Hydraulic pump; 12. Salvage plate; 13. Mounting base; 14. Salvage arm; 15. Hydraulic rod. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Please see Figures 1-4 This utility model provides a technical solution: a salvage tool for oilfield operations, including a main rod 1, a power line 2 fixedly installed at the lower part of the main rod 1, a control line 3 fixedly installed at the lower part of the main rod 1, a spring limiting sleeve 4 fixedly installed on the outer side of the main rod 1, a movable rod 5 movably installed on the other side of the spring limiting sleeve 4, movable wheels 6 fixedly installed on both sides of the other end of the movable rod 5, a threaded rod 7 fixedly installed on the inner side of one movable wheel 6, a limiting nut 8 movably installed on the outer side of the threaded rod 7, and an installation tube 9 fixedly installed above the main rod 1. A sealing ring 10 is fixedly installed, a hydraulic pump 11 is fixedly installed inside the installation pipe 9, and a retrieval plate 12 is fixedly installed above the installation pipe 9. First, the retrieval tool is lowered into the well through the wellhead. Since the main rod 1 is made of soft metal material, it can bend naturally according to the shape of the well, guiding the retrieval tool to the target position. During the movement, the moving wheel 6 relies on the anti-slip texture on its surface to contact the well wall or working face, providing stable friction and ensuring that the retrieval tool moves smoothly. The compression spring in the spring limit sleeve 4 pushes the movable rod 5, so that the moving wheel 6 always fits against the well wall.
[0026] Mounting seats 13 are fixedly installed on both sides above the retrieval plate 12. Retrieval arms 14 are fixedly installed on the mounting seats 13, and hydraulic rods 15 are fixedly installed between the retrieval arms 14. The retrieval arms 14 are driven by the hydraulic rods 15. The main rod 1 is made of a flexible metal material to allow it to bend better in oilfields with different environments to reach the designated location. The moving wheels 6 have anti-slip textures on their surface to increase friction with the oilfield well wall or working surface and prevent the retrieval tool from slipping during movement. The sealing ring 10 is made of oil-resistant rubber material, and its inner diameter matches the outer diameter of the mounting pipe 9, allowing it to tightly fit the mounting pipe 9 and the upper connecting parts to prevent oil leakage. The hydraulic pump 11 is connected to an external power source and control equipment via power line 2 and control line 3. The hydraulic pump 11 is powered and its operation is controlled to provide power for the salvage operation. A compression spring is installed on the inner side of the spring limit sleeve 4. The other end of the compression spring is connected to the movable rod 5 to provide the reset elastic force of the movable rod 5. When the salvage tool reaches the position of the dropped item, a command is sent to the hydraulic pump 11 through the control line 3. The power line 2 supplies power to the hydraulic pump 11, and the hydraulic pump 11 starts to work, transmitting hydraulic energy to the hydraulic rod 15. The hydraulic rod 15 extends and retracts according to the command, driving the salvage arm 14 to perform opening and closing actions, thereby grabbing the dropped item. During the entire operation, the sealing ring 10 tightly seals the installation pipe 9 and the upper connecting parts to prevent oil leakage and ensure the safety of the downhole environment and the salvage tool. After the salvage is completed, the operation is reversed to remove the salvage tool and item from the wellhead.
[0027] Working Principle: During oilfield salvage operations, the salvage tool is first lowered into the well through the wellhead. The main rod 1, made of flexible metal, bends naturally according to the shape of the wellbore, guiding the salvage tool to the target location. During movement, the moving wheel 6, with its anti-slip texture, contacts the well wall or working surface, providing stable friction to ensure smooth movement of the salvage tool. The compression spring inside the spring-limiting sleeve 4 pushes the movable rod 5, keeping the moving wheel 6 in contact with the well wall. When the salvage tool reaches the location of the dropped item, a command is sent to the hydraulic pump 11 via the control line 3. The power line 2 supplies power to the hydraulic pump 11, which then starts working, transmitting hydraulic energy to the hydraulic rod 15. The hydraulic rod 15 extends and retracts according to the command, driving the salvage arm 14 to open and close, thereby grabbing the dropped item. Throughout the operation, the sealing ring 10 tightly seals the mounting pipe 9 and the connecting components above, preventing oil leakage and ensuring the safety of the downhole environment and the salvage tool. After salvage is completed, the operation is reversed to retrieve the salvage tool and item from the wellhead.
[0028] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.
Claims
1. A salvage tool for oilfield operations, comprising a main pole (1), characterized in that: A power line (2) is fixedly installed below the main rod (1), a control line (3) is fixedly installed below the main rod (1), a spring limiting sleeve (4) is fixedly installed on the outside of the main rod (1), a movable rod (5) is movably installed on the other side of the spring limiting sleeve (4), movable wheels (6) are fixedly installed on both sides of the other end of the movable rod (5), a threaded rod (7) is fixedly installed on the inner side of one of the movable wheels (6), a limiting nut (8) is movably installed on the outer side of the threaded rod (7), an installation tube (9) is fixedly installed above the main rod (1), a sealing ring (10) is fixedly installed above the installation tube (9), a hydraulic pump (11) is fixedly installed on the inner side of the installation tube (9), and a retrieval plate (12) is fixedly installed above the installation tube (9).
2. The salvage tool for oilfield operations according to claim 1, characterized in that: Mounting seats (13) are fixedly installed on both sides above the salvage plate (12). A salvage arm (14) is fixedly installed on the mounting seat (13). A hydraulic rod (15) is fixedly installed between the salvage arms (14). The salvage arms (14) are driven by the hydraulic rod (15).
3. A salvage tool for oilfield operations according to claim 2, characterized in that: The main rod (1) is made of a soft metal material.
4. A salvage tool for oilfield operations according to claim 3, characterized in that: The surface of the movable wheel (6) is provided with anti-slip texture.
5. A salvage tool for oilfield operations according to claim 4, characterized in that: The sealing ring (10) is made of oil-resistant rubber material, and its inner diameter is matched with the outer diameter of the mounting tube (9).
6. A salvage tool for oilfield operations according to claim 1, characterized in that: The hydraulic pump (11) is connected to an external power source and control equipment via a power line (2) and a control line (3).
7. A salvage tool for oilfield operations according to claim 1, characterized in that: A compression spring is provided on the inner side of the spring limiting sleeve (4), and the other end of the compression spring is connected to the movable rod (5).