Temporary plugging tool for oil pipe

Abstract

The utility model relates to a temporary plugging tool for an oil pipe. The temporary plugging tool comprises a sleeve at an underground preset plugging position and a plugging structure in the sleeve, the sleeve is installed at the joint of the two oil pipes through threads arranged at the upper end and the lower end outside the sleeve. A trapezoidal groove and a bottom step for stopping the lock cylinder and enabling the lock cylinder not to exceed the bottom end of the sleeve are arranged in the sleeve; the blocking structure comprises a hollow cylindrical lock cylinder and a balance rod inserted into the lock cylinder. The plug is mounted at the lower part of the lock cylinder; the balance rod penetrates through the lock cylinder through downward vibration and corresponds to a balance hole formed in the side wall of the plug. The groove and the lock cylinder are used in a matched mode, the bottom step has the function of stopping passing, the lock cylinder and the plug are both stopped, the bottom does not pass the end, the plug is sealed in the step, a pipe column can be temporarily plugged, and pipe column leakage detection and non-well-killing rectification or well mouth replacement can be conducted.

Description

Technical Field

[0001] The utility model belongs to the technical field of completion tools for setting packers and temporarily plugging pipe columns in oil and gas well completion operations, and particularly relates to a temporary plugging tool for oil pipes. Background Art

[0002] The ball seat is a downhole tool used to complete the sealing of the hydraulic packer. Its main functions are: a temporary tubing plugging tool (seating short section) is connected to the lower part of the completion string packer. Before sealing, the tubing is unobstructed and can circulate; when the packer is set, it can cooperate with the plug to achieve sealing in the tubing and pressurize the tubing; after setting, it cannot be knocked down, and the plug must be pulled out to achieve unobstructed tubing. The ball seat used for conventional plugging is mainly used for sealing in vertical well sections. The operating procedure for setting the packer is: the plugger is sent into the well by a steel wire → the plugger sits on the ball seat to form a seal → the pressure difference between the upper and lower parts of the plugger is pressed → the plugger is pulled out. This ball seat can only withstand positive pressure to complete the sealing of the packer, but cannot achieve temporary sealing of the tubing. Therefore, a ball seat is needed that can not only throw in a plugging and sealing packer, but also close and open the branch well by inserting a matching lock core plug;

[0003] The utility model aims to provide a temporary plugging tool for oil pipes, which can seal a packer by setting a plug, and can also shut down a well or test a production oil pipe by setting a plug, so as to achieve a pressure difference between the upper and lower parts, temporarily seal the pipe column, have an internal spraying function, and seal a packer. Summary of the invention

[0004] In order to solve the technical problem that the oil pipe cannot be temporarily blocked effectively, the utility model provides a temporary blocking tool for the oil pipe, which realizes effective blocking of the oil pipe.

[0005] A temporary plugging tool for an oil pipe, comprising: a casing at a predetermined plugging position underground and a plugging structure inside the casing;

[0006] The casing is installed at the connection between the two oil pipes through threads arranged at the upper and lower ends of the casing; a trapezoidal groove is arranged inside the casing and a bottom step is provided to stop the lock core from passing through so that the lock core does not exceed the bottom end of the casing;

[0007] The blocking structure includes a hollow cylindrical lock core, a balance rod inserted into the lock core, and a plug installed at the lower part of the lock core; the balance rod passes through the lock core by shocking downward and corresponds to the balance hole opened on the side wall of the plug.

[0008] The plug that matches the lock core can withstand pressure in both directions, and current experimental tests have shown that it can withstand a pressure of 7500PSI at a high temperature of 177°C.

[0009] The inner wall of the sleeve is uniform and polished, so that the blocking structure can pass smoothly without being damaged.

[0010] The outside of the lock core is provided with a protrusion matched with the trapezoidal groove of the sleeve, and an inclined surface structure that can be stuck on the bottom step.

[0011] The threads on the outside of the casing may be airtight threads, and may be set as API oil pipe threads.

[0012] The temporary oil pipe plugging tool is an integral locking groove structure.

[0013] The balance rod is in contact with the side wall of the plug and a sealing ring is provided.

[0014] A steel wire is arranged on the upper end of the balance rod, and the balance rod is placed in the sleeve position through the steel wire.

[0015] The steel wire connected running tool jars the balance bar downwards, causing the balance bar to move downwards and close the balance hole, and then continues to jar the running tool to release it, thus completing temporary plugging in the oil pipe.

[0016] A gap is left between the plug and the sleeve so that liquid can flow in from the balance hole after the balance rod is removed.

[0017] The utility model proposes a temporary plugging tool for oil pipes, including: a casing at a predetermined plugging position underground and a plugging structure inside the casing; including a groove and a bottom step. The groove is used in conjunction with a lock core, and the bottom step has a stop function, so that the lock core and the plug are both stopped, and the bottom is not over-reaching, and the plug is sealed here. Due to the implementation of the above technical scheme, the present application can realize the secondary sealing of the packer, avoiding the unstable factor of the ball seat being knocked down prematurely during use, and at the same time can temporarily block the pipe string, conduct pipe string leak detection and non-pressure well rectification or replace the wellhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a structural schematic diagram of a temporary plugging tool for an oil pipe.

[0019] Figure 2 The present invention is a structural schematic diagram of a temporary oil pipe plugging tool in an open state.

[0020] In the figure: 100, sleeve; 101, trapezoidal groove; 102, bottom step; 200, lock core; 201, plug; 202, lock key; 203, balance hole; 300, balance rod; 400, blocking structure. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0022] Example: Figure 1 , Figure 2As shown, a temporary plugging tool for oil pipes includes a groove 101 and a bottom step 102. After the temporary plugging tool for oil pipes is lowered into place with the pipe string, the plug 201 is connected under the lock core 200, and the tool is connected with a steel wire and put into a predetermined working cylinder in the well. The tool is connected with a steel wire to lower the balance bar 300 and jar downward, so that the balance bar 300 moves downward to close the balance hole 203, and then the tool is jarred to release the tool, completing the temporary plugging in the oil pipe, playing the role of internal spraying, and sealing the packer. When it is necessary to lift it out, connect the lowering tool under the basic tool string, lower the balance bar 300 into the well, and after the balance bar 300 is fished out, connect the lifting tool under the basic tool string, lower the well to push the lock core 200, and jar upward to fish out the plugger. At the same time, it can also deliver the plug, withstand positive pressure, and seal the packer.

[0023] A temporary plugging tool for an oil pipe, comprising: a casing 100 at a predetermined plugging position downhole and a plugging structure 400 inside the casing;

[0024] The sleeve 100 is installed at the connection between the two oil pipes through threads provided at the upper and lower ends of the outer casing 100; a trapezoidal groove 101 is provided inside the sleeve 100 and a bottom step 102 is provided to stop the lock core from passing through so that the lock core 200 does not exceed the bottom end of the sleeve 100;

[0025] The blocking structure 400 includes a hollow cylindrical lock core 200, a balance rod 300 inserted into the lock core; a plug 201 installed at the lower part of the lock core 200; the balance rod 300 passes through the lock core 200 by shocking downward to correspond to the balance hole 203 opened on the side wall of the plug 201.

[0026] The plug 201 that matches the lock core can withstand pressure in both directions, and according to current experimental tests, it can withstand a pressure of 7500PSI at a high temperature of 177°C.

[0027] The inner wall of the sleeve 100 is uniform and polished, so that the blocking structure 400 can pass smoothly without being damaged.

[0028] The lock core 200 is provided with a lock key 202 matched with the trapezoidal groove 101 of the sleeve 100 and an inclined surface structure that can be stuck on the bottom step 102 on the outside.

[0029] The threads on the outside of the casing 100 may be airtight threads, and may be set as API oil pipe threads.

[0030] The temporary oil pipe plugging tool is an integral locking groove structure.

[0031] The balance rod 300 is in contact with the side wall of the plug 201 and is provided with a sealing ring.

[0032] A steel wire is arranged at the upper end of the balance bar 300, and the balance bar 300 is placed in the sleeve position through the steel wire.

[0033] The steel wire connected running tool jars the balance bar 300 downward, causing the balance bar 300 to move downward and close the balance hole 203, and then continues to jar to release the running tool, completing temporary plugging in the oil pipe.

[0034] A gap is left between the plug 201 and the sleeve 100 so that liquid can flow in from the balance hole 203 after the balance rod 300 is removed.

[0035] The above technical features constitute the best implementation example of the present utility model, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A temporary plugging tool for oil pipes, characterized in that: include: A casing (100) at a predetermined plugging position underground and a plugging structure (400) inside the casing; The casing (100) is installed at the connection between two oil pipes through threads arranged at the upper and lower ends of the casing; a trapezoidal groove (101) is arranged inside the casing and a bottom step (102) is provided to stop the lock core from passing through so that the lock core does not exceed the bottom end of the casing; The blocking structure (400) comprises a hollow cylindrical lock core (200), a balance rod (300) inserted into the lock core, and a plug (201) installed at the bottom of the lock core; the balance rod (300) passes through the lock core (200) by shaking downwards and corresponds to a balance hole (203) opened on the side wall of the plug (201).

2. The temporary plugging tool for oil pipes according to claim 1, characterized in that: The plug (201) can withstand pressure in both directions, and according to current experimental tests, it can withstand a pressure of 7500 PSI at a high temperature of 177°C.

3. The temporary plugging tool for oil pipes according to claim 1, characterized in that: The inner wall of the sleeve (100) is uniform and polished, allowing the blocking structure to pass smoothly without being damaged.

4. The temporary plugging tool for oil pipes according to claim 1, characterized in that: The lock core (200) is provided with a lock key (202) matched with the trapezoidal groove (101) of the sleeve on the outside, and an inclined surface structure that can be stuck on the bottom step (102).

5. The temporary plugging tool for oil pipes according to claim 1, characterized in that: The threads on the outside of the casing (100) may be airtight threads, and may be set as API oil pipe threads.

6. The temporary plugging tool for oil pipes according to claim 1, characterized in that: The temporary oil pipe plugging tool is an integral locking groove structure.

7. The temporary plugging tool for oil pipes according to claim 1, characterized in that: The balance rod (300) is in contact with the side wall of the plug (201) and is provided with a sealing ring.

8. The temporary plugging tool for oil pipes according to claim 1, characterized in that: A steel wire is arranged at the upper end of the balance bar (300), and the balance bar (300) is placed at the position of the sleeve (100) via the steel wire.

9. The temporary plugging tool for oil pipes according to claim 1, characterized in that: The running tool is connected with a steel wire to shock the balance rod (300) downward, so that the balance rod (300) moves downward to close the balance hole (203), and then the shock is continued to release the running tool, thereby completing the temporary plugging of the oil pipe.

10. The temporary plugging tool for oil pipes according to claim 1, characterized in that: A gap is left between the plug (201) and the sleeve (100) so that liquid can flow in from the balance hole (203) after the balance rod (300) is removed.

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