Underground auxiliary fishing tool

Abstract

The utility model relates to the technical field of oil and gas downhole tools, and discloses a downhole auxiliary fishing tool which comprises a threaded connecting seat, a rotating connector is fixedly connected to the bottom of the threaded connecting seat, the rotating connector is rotatably connected with a rotating connecting seat through a bearing, a rotating pipe is fixedly connected to the rotating connecting seat, and a check block is slidably connected into a rotating rod. A telescopic pipe is fixedly connected to the stop block, the telescopic pipe penetrates through the rotating pipe to be fixedly connected with a plug, a second rotating connecting disc is fixedly connected to the plug, a first rotating connecting disc is fixedly connected to the outer wall of the rotating pipe, and a plurality of sets of fishing claws which are circumferentially distributed with the first rotating connecting disc as the center are rotationally connected to the first rotating connecting disc; falling objects at the bottom of a well are fished and grabbed through the multiple sets of fishing grabs which can be unfolded and folded, active grabbing of the falling objects at the bottom of the well is achieved through the rotatable arrangement of the fishing grabs, the falling objects can be effectively prevented from falling off in the lifting process, and the practicability of equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of downhole tools technology for oil and gas wells, specifically a downhole auxiliary fishing tool. Background Technology

[0002] Downhole operations are a technical means to ensure the normal production of oil and water wells during oilfield exploration and development. The handling of fallen objects during downhole operations generally involves using appropriate retrieval tools, employing either internal or external retrieval methods, depending on the type of object. During oil, gas, and water well production, due to high formation salinity and other factors, scale may form on the inner walls of fallen objects during downhole operations. Using conventional internal retrieval tools (such as conical hooks and spears) can lead to problems such as the tool failing to properly enter the well cavity or the tool's threads (slips) getting caught in the scaled areas, causing the object to slip and fall back into the well, resulting in a low retrieval success rate. Utility Model Content

[0003] The purpose of this invention is to provide a downhole auxiliary fishing tool to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A downhole auxiliary fishing tool includes a threaded connector seat, a probe rod at the top of the threaded connector seat, a threaded connector head fixedly connected to the probe rod, the threaded connector head being threadedly connected to the threaded connector seat, a rotating connector head fixedly connected to the bottom of the threaded connector seat, the rotating connector head being rotatably connected to the rotating connector seat via a bearing, a rotating tube fixedly connected to the rotating connector seat, a stop block slidably connected inside the rotating rod, a telescopic tube fixedly connected to the stop block, a plug fixedly connected to the telescopic tube passing through the rotating tube, a second rotating connector plate fixedly connected to the plug, a first rotating connector plate fixedly connected to the outer wall of the rotating tube, a plurality of fishing grabs rotatably connected to the first rotating connector plate and arranged in a circle around the first rotating connector plate, and a plurality of traction rods rotatably connected to the second rotating connector plate and arranged in a circle around the second rotating connector plate, the traction rods being rotatably connected to the fishing grabs;

[0006] A rotary drive assembly is installed between the threaded connector and the rotating tube to drive relative rotation between them.

[0007] As a further embodiment of this utility model, a counterweight is fixedly connected to the plug.

[0008] As a further embodiment of this utility model: the rotary drive assembly includes a sliding connection groove disposed in the stop block, and a helical rod is fixedly connected to the bottom of the rotary connector, the helical rod being slidably connected to the sliding connection groove.

[0009] As a further embodiment of this utility model: a spring disposed inside the rotating tube is connected between the stop block and the rotating connecting seat.

[0010] As a further improvement of this utility model, the retrieval grab is fixedly connected with an anti-detachment hook.

[0011] As a further improvement of this utility model, a limiting block is fixedly connected to one end of the retrieval grab near the first rotating connecting plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are: this utility model uses multiple sets of deployable and retractable retrieval grabs to retrieve objects falling from the bottom of the well, and through the rotatable setting of the retrieval grabs, it can actively grab objects falling from the bottom of the well, which can effectively prevent objects from falling off during the lifting process and improve the practicality of the equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an auxiliary fishing tool for wells according to the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of a downhole auxiliary retrieval tool in its deployed state according to this utility model.

[0015] Figure 3 This is a schematic diagram of the structure of the spiral rod in a downhole auxiliary retrieval tool according to the present invention.

[0016] Figure 4 This is a cross-sectional view of a downhole auxiliary salvage tool according to the present invention.

[0017] In the diagram: 1-Threaded connector, 2-Probe rod, 3-Threaded connector, 4-Rotating tube, 5-Rotating connector, 6-Rotating connector, 7-Stop block, 8-Telescopic tube, 9-Plug, 10-First rotating connecting plate, 11-Second rotating connecting plate, 12-Retrieval grab, 13-Limit block, 14-Traction rod, 15-Sliding connecting groove, 16-Helical rod, 17-Spring, 18-Anti-disengagement hook. Detailed Implementation

[0018] 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.

[0019] See Figures 1-4In this embodiment of the utility model, a downhole auxiliary fishing tool includes a threaded connector 1, a probe 2 is provided at the top of the threaded connector 1, a threaded connector 3 is fixedly connected to the probe 2, the threaded connector 3 is threadedly connected to the threaded connector 1, a rotating connector 6 is fixedly connected to the bottom of the threaded connector 1, the rotating connector 6 is rotatably connected to a rotating connector 5 through a bearing, a rotating tube 4 is fixedly connected to the rotating connector 5, a stop 7 is slidably connected inside the rotating rod, a telescopic tube 8 is fixedly connected to the stop 7, and the telescopic tube 8 passes through the rotating tube 4 and is fixedly fixed. A plug 9 is connected, and a second rotating connecting plate 11 is fixedly connected to the plug 9. A first rotating connecting plate 10 is fixedly connected to the outer wall of the rotating tube 4. Multiple sets of retrieval grabs 12 are rotatably connected to the first rotating connecting plate 10 and arranged in a circle around the first rotating connecting plate 10. Multiple sets of traction rods 14 are rotatably connected to the second rotating connecting plate 11 and arranged in a circle around the second rotating connecting plate 11. The traction rods 14 are rotatably connected to the retrieval grabs 12. A rotary drive assembly is installed between the threaded connecting seat 1 and the rotating tube 4.

[0020] This invention first connects the device and the probe rod 2 via a threaded connection between the threaded connector 3 and the threaded connector seat 1. Before insertion into the well bottom, the retrieval grab 12 remains in a retracted state under the action of the rotary drive assembly. At this time, multiple sets of retrieval grabs 12 rotate and adhere to the outer wall of the rotating tube 4. The device can then be inserted into the oil and gas well via the probe rod 2. As the probe rod 2 is inserted, the device gradually penetrates to the bottom of the well. When the plug 9 contacts the bottom of the well, the plug stops descending, and the rotating rod continues to press down under the drive of the probe rod 2. At this time, the plug 9 moves the stop block 7 into the rotating tube 4 via the connecting tube. The first rotary connection... The disk 10 and the second rotating connecting disk 11 are relatively closed. The retrieval grab 12 is rotated and unfolded away from the rotating pipe 4 under the drive of the traction rod 14. During the unfolding process of the retrieval grab 12, the linear motion of the telescopic pipe 8 is converted into the rotational motion between the threaded connecting seat 1 and the rotating pipe 4 through the rotation drive component. Then, the rotating pipe 4 drives the retrieval grab 12 to rotate while unfolding, thereby rotating and grabbing the object at the bottom of the well. Then the probe rod 2 is lifted. At this time, the retrieval grab 12 is reset and closed, thereby collecting and fixing the grabbed object, thus preventing the object from falling off during the lifting process.

[0021] In one instance of this embodiment, please refer to Figures 1-4 The plug is fixedly connected to a counterweight. This invention adjusts the center of gravity of the equipment by setting the counterweight, thereby preventing the equipment from tipping over during lifting.

[0022] In one instance of this embodiment, please refer to Figures 1-4The rotary drive assembly includes a sliding connection groove 15 disposed in the stop block 7, a spiral rod 16 fixedly connected to the bottom of the rotary connector 6, the spiral rod 16 being slidably connected to the sliding connection groove 15, and a spring 17 disposed in the rotary tube 4 connecting the stop block 7 and the rotary connector 5.

[0023] When the plug 9 drives the stop 7 to slide inside the rotating tube 4 through the telescopic tube 8, the stop 7 is slidably connected to the sliding connecting groove 15 through the helical rod 16, converting the linear motion of the stop 7 into the rotational motion of the stop 7. The stop 7 drives the rotating tube 4 to rotate. While the stop 7 is moving, it compresses the spring 17. The telescopic tube 8 loses its limit, and the spring 17 releases its elastic potential energy, thereby driving the stop 7 to move and reset.

[0024] In one instance of this embodiment, please refer to Figures 1-4 The retrieval grab 12 is fixedly connected with an anti-detachment hook 18. The present invention uses the anti-detachment hook 18 to hook the material grabbed on the retrieval grab 12 tightly, thereby preventing the material from slipping off during the lifting and lowering process.

[0025] In one instance of this embodiment, please refer to Figures 1-4 The end of the retrieval grab 12 near the first rotating connecting plate 10 is fixedly connected to a limiting block 13. The present invention limits the rotation angle of the retrieval grab 12 by the cooperation between the limiting block 13 and the first rotating connecting plate 10, thereby preventing the retrieval grab 12 from being over-extended.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A downhole auxiliary fishing tool, comprising a threaded connection seat, characterized in that, A probe is provided at the top of the threaded connector, and a threaded connector is fixedly connected to the probe. The threaded connector is threadedly connected to the threaded connector. A rotating connector is fixedly connected to the bottom of the threaded connector. The rotating connector is rotatably connected to the rotating connector via a bearing. A rotating tube is fixedly connected to the rotating connector. A stop is slidably connected inside the rotating rod. A telescopic tube is fixedly connected to the stop. A plug is fixedly connected to the telescopic tube through the rotating tube. A second rotating connecting plate is fixedly connected to the plug. A first rotating connecting plate is fixedly connected to the outer wall of the rotating tube. Multiple sets of retrieval grabs are rotatably connected to the first rotating connecting plate in a circumferential arrangement centered on the first rotating connecting plate. Multiple sets of traction rods are rotatably connected to the second rotating connecting plate in a circumferential arrangement centered on the second rotating connecting plate. The traction rods are rotatably connected to the retrieval grabs. A rotary drive assembly is installed between the threaded connector and the rotating tube to drive relative rotation between them.

2. The downhole auxiliary fishing tool according to claim 1, characterized in that, A counterweight is fixedly connected to the plug.

3. The downhole auxiliary fishing tool according to claim 1, characterized in that, The rotary drive assembly includes a sliding connection groove disposed within the stop block, and a helical rod is fixedly connected to the bottom of the rotary connector, with the helical rod slidably connected to the sliding connection groove.

4. The downhole auxiliary fishing tool according to claim 3, characterized in that, A spring installed inside the rotating tube connects the stop block and the rotating connecting seat.

5. The downhole auxiliary fishing tool according to claim 1, characterized in that, The retrieval grab is fixedly connected with an anti-detachment hook.

6. The downhole auxiliary fishing tool according to claim 1, characterized in that, A limit block is fixedly connected to one end of the retrieval grab near the first rotating connecting plate.

Images