Coiled tubing fishing socket of underground throttler

Abstract

The utility model relates to the technical field of downhole throttler fishing, in particular to a downhole throttler coiled tubing fishing socket which comprises an upper shell, a lower shell and a guide shoe arranged at the bottom of the lower shell, a connector is arranged at the top of the upper shell, a pressure relief hole is formed in the outer side of the upper shell, and a pressure relief valve is arranged in the pressure relief hole. And a communicating pipeline is arranged in the lower shell. When underground fishes are fished by the fishing cylinder through a continuous oil pipe, silt in a well is blocked and filtered through the semi-elliptical filter screen, so that liquid is conveyed through the communicating pipeline and discharged through the net cylinder, the resistance of the fishing cylinder in the downward movement process is reduced, and in the process of lifting the fishes, the fishing cylinder is prevented from being blocked and filtered by the semi-elliptical filter screen. Sediment is filtered through the net cylinder, so that liquid is conveyed to the position of the semi-oval filter net through the communicating pipeline to be discharged, the resistance of the liquid in a well to the fishing cylinder in the using process of the fishing cylinder is reduced, and therefore the fishing efficiency of fallen fishes is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole choke fishing, in particular to a downhole choke coiled tubing fishing tube. Background Art

[0002] Coiled tubing is a highly flexible pipe material, typically reaching several thousand meters in length. Compared to conventional tubing, it offers advantages such as pressure-operated and continuous tripping, compact equipment, fast cycle times, and low costs. Coiled tubing is being used in many oilfield operations, replacing conventional tubing.

[0003] In the existing technology, continuous oil tubing is used in salvage operations. The continuous oil tubing simplifies the traditional process of connecting sections one by one in salvage operations. It can be directly connected to the corresponding salvage tools for operation. When salvaging fish dropped in the pipe, a retractable slip overshot tube is connected. After pumping in working fluid for flushing, the fish is captured and fixed using a guide shoe, completing the salvage quickly and improving efficiency.

[0004] When using an overshot to salvage a fallen fish, when the overshot encounters liquid in the well, during the process of diving or salvaging the fallen fish, the liquid in the well will cause the overshot to generate resistance during the diving or lifting process, reducing the speed of the coiled tubing to dive or lift the overshot, and reducing the efficiency of salvaging the fallen fish in the well. Utility Model Content

[0005] The utility model aims to provide a downhole choke coiled tubing overshot tube, which has the characteristics of reducing resistance and improving fishing efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a downhole choke coiled tubing salvage tube, comprising an upper shell and a lower shell, a guide shoe arranged at the bottom of the lower shell, a joint arranged at the top of the upper shell, a pressure relief hole arranged on the outside of the upper shell, a connecting pipe arranged inside the lower shell, a mesh tube movably connected to the inside of the connecting pipe, and a semi-elliptical filter fixedly installed at the bottom of the lower shell.

[0007] As a preferred downhole choke coiled tubing overshot of the present invention, the upper shell and the lower shell are fixedly installed, and the upper shell and the joint are fixedly installed.

[0008] As a preferred downhole choke coiled tubing overshot tube of the present invention, the semi-elliptical filter screen corresponds to the position of the lower port of the communicating pipe, and the screen tube is located at the top port of the communicating pipe.

[0009] As a preferred downhole choke coiled tubing overshot tube of the present invention, a counterweight is fixedly installed on the top of the mesh tube, and a fixing rod is fixedly installed on the top of the counterweight, and the fixing rod corresponds to the position of the communicating pipe.

[0010] As a preferred downhole choke coiled tubing overshot of the present invention, a fixing block is fixedly installed on the outer side of the lower shell, a circular hole is opened on the surface of the fixing block, and the fixing block is slidably connected to the fixing rod through the circular hole.

[0011] As a preferred embodiment of the downhole choke coiled tubing overshot of the present invention, an external hexagonal structure is provided below the joint, which facilitates installation and disassembly of the joint.

[0012] As a preferred embodiment of the downhole choke coiled tubing overshot of the present invention, the communicating pipe, the fixing block and the net tube are all four in number and their positions correspond to each other.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] When the overshot is used to salvage a fish fallen in the well by using a continuous oil pipe, the mud and sand in the well are blocked and filtered by the semi-elliptical filter, so that the liquid is transported through the connecting pipe through the mesh tube for discharge, thereby reducing the resistance of the overshot during the downward movement. In the process of lifting the fallen fish, the mud and sand are filtered by the mesh tube, so that the liquid is transported through the connecting pipe to the position of the semi-elliptical filter screen for discharge, thereby reducing the resistance of the liquid in the well to the overshot during use, increasing the diving and lifting speed of the overshot, and thus improving the efficiency of salvaging the fallen fish. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional structural diagram of the utility model;

[0016] Figure 2 This is a reference diagram of the diving process of the utility model;

[0017] Figure 3 This is a reference diagram of the lifting process of the utility model;

[0018] Figure 4 This is a partial explosion reference diagram of the utility model.

[0019] In the figure: 1. Upper shell; 2. Lower shell; 3. Guide shoe; 4. Fixing block; 5. Mesh cylinder; 6. Connector; 7. Pressure relief hole; 8. Semi-elliptical filter; 9. Balance pipe; 10. Fixing rod; 11. Counterweight. DETAILED DESCRIPTION

[0020] See also Figures 1 to 4A downhole choke coiled tubing overshot tube comprises an upper shell 1 and a lower shell 2, a guide shoe 3 provided at the bottom of the lower shell 2, a joint 6 provided at the top of the upper shell 1, a pressure relief hole 7 provided on the outside of the upper shell 1, a connecting pipe 9 provided inside the lower shell 2, a net tube 5 movably sleeved on the inside of the connecting pipe 9, and a semi-elliptical filter screen 8 fixedly installed on the bottom of the lower shell 2.

[0021] In this embodiment, when salvaging operations are being performed, the top of the fish enters the interior of the overshot through the guide shoe 3, facilitating the salvaging of the fish. The provision of the joint 6 facilitates the installation of a coiled tubing for salvaging the fish downhole. The provision of the pressure relief hole 7 serves to release the pressure of the working fluid in the upper shell 1. The provision of the mesh tube 5 and the semi-elliptical filter 8 facilitates filtering and blocking impurities in the well fluid, facilitating the flow of the well fluid through the connecting pipe 9, thereby reducing the resistance of the liquid to the overshot during its movement.

[0022] As a technical optimization solution of the present invention, the upper shell 1 is fixedly installed with the lower shell 2, and the upper shell 1 is fixedly installed with the joint 6; the semi-elliptical filter 8 corresponds to the low port position of the connecting pipe 9, and the mesh tube 5 is located at the top port of the connecting pipe 9.

[0023] In this embodiment, the upper shell 1 is fixedly mounted to the joint 6. The joint 6 facilitates installation of a coiled tubing for salvaging fish dropped into the well. The semi-elliptical filter 8 corresponds to the lower end position of the connecting pipe 9. The mesh drum 5 is located at the top end of the connecting pipe 9. The mesh drum 5 and the semi-elliptical filter 8 facilitate filtering and blocking impurities in the well liquid, facilitate the flow of the well liquid through the connecting pipe 9, and reduce the resistance of the liquid during the salvage process.

[0024] As a technical optimization solution of the present invention, a counterweight 11 is fixedly installed on the top of the net cylinder 5, and a fixing rod 10 is fixedly installed on the top of the counterweight 11. The fixing rod 10 corresponds to the position of the communicating pipe 9.

[0025] In this embodiment, by providing a mesh tube 5, when the overshot tube dives into the well, the impact of the liquid flowing through the connecting pipe 9 on the mesh tube 5 will cause the mesh tube 5 to move upward, and the liquid will impact the mud and sand outside the mesh tube 5, cleaning the mesh tube 5 and flushing away the mud and sand.

[0026] As a technical optimization solution of the present invention, a fixing block 4 is fixedly installed on the outer side of the lower shell 2. A circular hole is opened on the surface of the fixing block 4, and the fixing block 4 is slidably connected with the fixing rod 10 through the circular hole.

[0027] In this embodiment: by setting a fixed block 4, the fixed rod 10 is convenient to move along the fixed block 4. During the upward movement of the fixed rod 10, the position of the counterweight 11 is restricted by the fixed block 4, thereby preventing the mesh tube 5 from falling off from the connecting pipe 9, thereby ensuring that the mesh tube 5 filters impurities in the liquid.

[0028] As a technical optimization solution of the present invention, an external hexagonal structure is provided below the connector 6 , which facilitates installation and disassembly of the connector 6 .

[0029] In this embodiment, the outer hexagonal structure is provided to facilitate the installation and connection of the coiled tubing and the joint 6 , and to facilitate the installation or disassembly operation.

[0030] As a technical optimization solution of the present invention, there are four communicating pipes 9, four fixing blocks 4, and four net tubes 5, and their positions correspond to each other.

[0031] In this embodiment, four connecting pipes 9 are provided to facilitate the flow of liquid and reduce the resistance of the liquid to the overshot during the salvaging process.

[0032] Working principle: First, the external coiled tubing is installed and connected to the joint 6. When salvaging a fish downhole, the overshot is submerged into the well. When encountering liquid during the diving process, the liquid will pass through the semi-elliptical filter 8 to filter out impurities and then be transported to the position of the mesh tube 5 through the connecting pipe 9. The mesh tube 5 will flow out the liquid, reducing the resistance of the liquid in the well to the overshot. When the fish is lifted up, the liquid in the well will pass through the mesh tube 5 to filter out impurities and then be transported to the position of the semi-elliptical filter 8 through the connecting pipe 9 for discharge, reducing the resistance of the liquid during the movement of the overshot and improving the salvage speed of the overshot during the diving or lifting process.

[0033] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature rivets and welding in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field. All electrical equipment in the present invention is powered by an external power supply.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A downhole choke coiled tubing overshot, comprising an upper shell (1) and a lower shell (2), and a guide shoe (3) provided at the bottom of the lower shell (2), characterized in that: A joint (6) is provided at the top of the upper shell (1), a pressure relief hole (7) is provided on the outside of the upper shell (1), a connecting pipe (9) is provided inside the lower shell (2), a mesh cylinder (5) is movably sleeved on the inside of the connecting pipe (9), and a semi-elliptical filter (8) is fixedly installed on the bottom of the lower shell (2).

2. A downhole choke coiled tubing overshot according to claim 1, characterized in that: The upper shell (1) and the lower shell (2) are fixedly mounted, and the upper shell (1) and the joint (6) are fixedly mounted.

3. The downhole choke coiled tubing overshot according to claim 1, characterized in that: The semi-elliptical filter screen (8) corresponds to the lower port position of the communicating pipe (9), and the mesh cylinder (5) is located at the top port of the communicating pipe (9).

4. The downhole choke coiled tubing overshot according to claim 1, characterized in that: A counterweight (11) is fixedly installed on the top of the net cylinder (5), and a fixing rod (10) is fixedly installed on the top of the counterweight (11), and the fixing rod (10) corresponds to the position of the communicating pipe (9).

5. The downhole choke coiled tubing overshot according to claim 4, characterized in that: A fixing block (4) is fixedly mounted on the outer side of the lower shell (2), a circular hole is provided on the surface of the fixing block (4), and the fixing block (4) is slidably sleeved with the fixing rod (10) through the circular hole.

6. The downhole choke coiled tubing overshot according to claim 1, characterized in that: An external hexagonal structure is provided below the connector (6), and the external hexagonal structure facilitates installation and removal of the connector (6).

7. The downhole choke coiled tubing overshot according to claim 5, characterized in that: The communicating pipe (9), the fixing block (4), and the net cylinder (5) are all four in number and their positions correspond to each other.

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