Workover treatment efficient dismounting device based on hydraulic boosting system and operation method

Abstract

The invention discloses a workover treatment efficient dismounting device based on a hydraulic boosting system and an operation method. The workover treatment efficient dismounting device comprises a supercharger and a back striking wrench. The supercharger comprises a shell, an oil way core, a throttling valve, an overflow valve, a control valve and a filter are installed in the shell, a supercharging module, an operating handle, an input inlet, an input outlet, a pressure measuring connector, an output inlet and an output outlet are installed outside the shell, the operating handle is connected with the control valve, and the supercharging module is connected with the filter. The back beating wrench comprises a bent handle, and the head of the bent handle is connected with a jackscrew. According to the invention, the function of dismounting rusted screws by using the low-pressure hydraulic pump of the workover rig in a manner of driving liquid with liquid is realized, the operation construction efficiency is improved, and the potential safety hazard of operation is eliminated.

Description

Technical Field

[0001] This invention relates to the field of well workover technology in oil production engineering, and in particular to a high-efficiency disassembly device and operating method for well workover operations based on a hydraulic booster system. Background Technology

[0002] In the oil and gas extraction sector, Liaohe Oilfield performs well repairs on approximately 20,000 wells annually, often facing numerous challenges during these operations. Wellhead bolts, exposed to the elements for extended periods, suffer severe corrosion from wind, sun, and rain, making disassembly difficult, time-consuming, and costly. Sucker rods are prone to getting stuck in the tubing due to sand or wax; traditional manual sawing methods are not only inefficient but also pose significant well control risks. During long injection well construction, flanges are prone to sticking, making them impossible to pry open with levers on-site, and using angle grinders or gas welding poses a fire and explosion risk. Traditional disassembly methods, such as gas welding and angle grinder cutting, are not only complex and inefficient but also require hot work reports, water tanker support, and mobile monitoring, making them extremely cumbersome.

[0003] A search revealed that the publication number CN109129284A, titled "Method and Apparatus for Tightening Bolts at Oil Wellheads," primarily focuses on bolt tightening operations. It achieves simultaneous tightening of multiple bolts through a multi-port hydraulic power balancing distribution device, but it cannot provide high-pressure power output to address disassembly challenges such as rusted screws and stuck flanges. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a highly efficient dismantling device and operating method for well workover operations based on a hydraulic booster system, which requires no open flame and utilizes an onboard hydraulic system.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a high-efficiency dismantling device for well workover operations based on a hydraulic boosting system, comprising a booster and a backing wrench; the booster includes a housing, in which an oil circuit core, a throttle valve, an overflow valve, a control valve, and a filter are installed, and outside the housing are a boosting module, an operating handle, an input inlet, an input outlet, a pressure measuring interface, an output inlet, and an output outlet, the operating handle being connected to the control valve, and the boosting module being connected to the filter; the backing wrench includes a bending handle, the head of which is connected to a set screw.

[0006] Furthermore, the head of the bending handle has a hollow hexagonal structure.

[0007] Furthermore, the outer wall of the head of the bending handle is provided with several set screw holes evenly spaced apart.

[0008] Furthermore, there is one top screw.

[0009] The operation method of the efficient disassembly device for well workover operations based on the hydraulic booster system includes the following steps:

[0010] Step 1: Device connection preparation;

[0011] Step 2: No-load test and pressure confirmation;

[0012] Step 3: Install and position the hydraulic wrench;

[0013] Step 4: Secure with a back wrench;

[0014] Step 5: Perform the disassembly operation.

[0015] Further, in step one, with the workover rig in the off state, disconnect the original hydraulic wrench pipeline; connect the hydraulic power end of the workover rig to the corresponding input inlet, input outlet, output inlet, and output outlet of the booster, ensuring good sealing of the interface; according to the hydraulic wrench inlet and outlet pipe markings, connect the hydraulic wrench to the output inlet and output outlet of the booster, check the pipeline connection for firmness, and avoid loosening or leakage.

[0016] Further, in step two, start the workover rig and open the six-way valve power switch to put the hydraulic system into operation. With the hydraulic wrench unloaded, move the booster operating handle and observe whether the hydraulic wrench rotates normally. If the hydraulic wrench rotates normally, it indicates that the pipeline connection is correct. If the hydraulic wrench does not rotate or rotates in the opposite direction, the inlet and outlet directions of the hydraulic pipeline of the workover rig need to be adjusted and the test repeated. After the pipeline connection is correct, observe the hydraulic power gauge of the workover rig to confirm that the pressure meets the working requirements.

[0017] Further, in step three, after confirming that the pressure is normal, put the hydraulic wrench onto the screw to be removed; manually adjust the position of the hydraulic wrench so that it is close to the nearby screw cap, ensuring a stable connection between the hydraulic wrench and the screw, and avoiding slippage during disassembly.

[0018] Further, in step four, place the back wrench at the lower end of the screw to be removed, tighten the set screw on the back wrench to make it press against the screw and nut; adjust the position of the back wrench handle so that it is attached to the nearby screw cap as a fixed fulcrum to ensure that the back wrench does not shift during the disassembly process.

[0019] Further, in step five, the operator moves away from the work area and moves the booster control handle back and forth. The high-pressure power output by the booster drives the hydraulic wrench to rotate, gradually completing the screw removal. After removing a single screw, the remaining non-diagonal screws are removed in sequence according to the above steps, and finally the four diagonal screws are removed. Repeat the operation until all target screws are removed.

[0020] This invention enables the removal of rusted screws using a low-pressure hydraulic pump integrated into the well workover rig, thereby improving work efficiency and eliminating potential safety hazards.

[0021] The booster in this invention transforms the current process of using an electric or pneumatically driven hydraulic pump station, which in turn drives a hydraulic wrench, into a creative improvement that uses low-pressure hydraulics to drive high-pressure hydraulics, making it more suitable for well workover operations. This ensures safe and efficient construction in flammable and explosive oil and gas environments, eliminating the risk of sparks and explosions. Furthermore, the booster can be used with different work heads to achieve more functions urgently needed at well workover sites.

[0022] By integrating a modular hydraulic booster structure with a low-pressure drive high-pressure conversion process, safe and efficient handling of challenging disassembly scenarios during well workover operations has been achieved.

[0023] The turbocharger features an integrated hydraulic circuit structure, housing core components such as an oil passage core, throttle valve, relief valve, control valve, and filter, forming a closed-loop hydraulic control circuit. The throttle valve and relief valve work together to precisely regulate input pressure, preventing pressure fluctuations from impacting the equipment. The control valve is linked to the operating handle, using a mechanical lever principle to achieve rapid hydraulic direction switching, meeting the needs of forward and reverse disassembly. The filter effectively intercepts impurities in the hydraulic oil, preventing wear on the turbocharger module.

[0024] The head of the back-end wrench features a hollow hexagonal design to fit common screw cap sizes, and the inner wall is hardened to improve wear resistance. The bending handle employs a biomimetic design to create a stable torque balance structure.

[0025] This invention enhances safety, eliminates the risks of hot work operations, eliminates the need for hot work permits, water tankers, and mobile monitoring, and reduces pre-operation safety preparation time by 80%. The back-end wrench enables unmanned operation, allowing operators to remotely control it from 5 meters away, avoiding injuries from flying screws. Operational efficiency is optimized; the time to remove rusted screws at the wellhead is reduced from 30 minutes per screw to 5 minutes per screw, an efficiency increase of 600%; sucker rod shearing takes only 5 seconds per rod, and flange separation takes ≤3 minutes per set, all meeting the continuous construction requirements of well workover operations. Its multi-functional adaptability allows it to cover over 90% of well workover disassembly scenarios by changing the working head, increasing equipment utilization to more than three times that of traditional tools and reducing equipment procurement and maintenance costs. Enhanced environmental adaptability enables it to adapt to complex climate conditions in oilfields. It achieves the goals of "safe and spark-free, highly efficient operation, and integrated equipment" in well workover operations, providing a reliable technical solution for oil and gas field well workover operations. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the turbocharger principle;

[0027] Figure 2 This is a schematic diagram of the turbocharger structure;

[0028] Figure 3 This is a front view of the turbocharger;

[0029] Figure 4 This is a schematic diagram of a wrench.

[0030] The components are: 1. Oil circuit core, 2. Throttle valve, 3. Overflow valve, 4. Control valve, 5. Filter, 7. Pressure boosting module, 8. Operating handle, 9. Input inlet, 10. Input outlet, 11. Pressure testing interface, 12. Output inlet, 13. Output outlet, 14. Bending handle, 15. Set screw. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-4 The technical solutions of the present invention have been clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The present invention is described in detail below through specific embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can all be obtained commercially.

[0033] In the description of this invention, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used only for distinction and should not be construed as indicating or implying relative importance.

[0034] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] Example 1

[0036] This is a high-efficiency dismantling device for well workover operations based on a hydraulic booster system, comprising a booster and a backing wrench. The booster includes a housing containing an oil circuit core 1, a throttle valve 2, an overflow valve 3, a control valve 4, and a filter 5. Outside the housing are a booster module 7, an operating handle 8, an input inlet 9, an input outlet 10, a pressure testing interface 11, an output inlet 12, and an output outlet 13. The operating handle 8 is connected to the control valve 4, and the booster module 7 is connected to the filter 5. The backing wrench includes a bending handle 14. The head of the bending handle 14 has a hollow hexagonal structure, accommodating common sized nuts. The inner wall is hardened (hardness ≥ HRC50) to improve wear resistance. The outer wall of the head of the bending handle 14 has several evenly spaced set screw holes, and the head of the bending handle 14 is connected to a set screw 15. The filter 5 contains a high-precision filter screen (pore size ≤ 5μm). The set screw holes are evenly distributed along the circumference of the head (with intervals of up to 60°). Each set screw 15 is made of high-strength alloy material (tensile strength ≥1200MPa), and when tightened, it can generate a radial pressure of ≥5kN, ensuring rigid fixation with the nut. The bending handle 14 adopts a biomimetic mechanical design (bending angle 135°), with anti-slip texture added to the end to conform to hand force application habits. At the same time, it can use the nearby nut as a fulcrum to form a stable torque balance structure. The turbocharger housing adopts an IP65 waterproof design, which can work stably in environments ranging from -30℃ to 60℃, adapting to the complex climatic conditions of oilfields. The hydraulic oil is selected as a low-temperature anti-wear type (viscosity index ≥140), ensuring smooth oil circuit in low-temperature environments.

[0037] The operation method of the efficient disassembly device for well workover operations based on the hydraulic booster system includes the following steps:

[0038] Step 1: Equipment Connection Preparation; With the workover rig in the off state, disconnect the original hydraulic wrench pipeline; Connect the hydraulic power end of the workover rig to the corresponding input inlet 9, input outlet 10, output inlet 12, and output outlet 13 of the booster, ensuring good sealing of the interface; According to the hydraulic wrench inlet and outlet pipe markings, connect the hydraulic wrench to the output inlet 12 and output outlet 13 of the booster, check the pipeline connection for firmness, and avoid loosening or leakage.

[0039] Step Two: No-load Test and Pressure Confirmation; Start the workover rig and open the six-way valve power switch to put the hydraulic system into operation; With the hydraulic wrench unloaded, move the booster operating handle 8 and observe whether the hydraulic wrench rotates normally: If the hydraulic wrench rotates normally, it indicates that the pipeline connection is correct; if the hydraulic wrench does not rotate or rotates in the opposite direction, the inlet and outlet directions of the hydraulic pipeline of the workover rig need to be adjusted and the test repeated; After the pipeline connection is correct, observe the hydraulic power gauge of the workover rig and confirm that the pressure reaches 15MPa. At this time, the output pressure of the booster can reach 70MPa, which is the rated working pressure of the hydraulic wrench.

[0040] Step 3: Install and position the hydraulic wrench; after confirming that the pressure is normal, put the hydraulic wrench on the screw to be removed, preferably any screw except the four diagonal screws; manually adjust the position of the hydraulic wrench so that it is close to the nearby screw cap, ensuring a stable connection between the hydraulic wrench and the screw, and avoiding slippage during disassembly.

[0041] Step 4: Secure the back wrench; Place the back wrench under the screw to be removed, tighten the set screw on the back wrench to make it press against the screw and nut; Adjust the position of the back wrench handle so that it is against the nearby screw nut as a fixed fulcrum to ensure that the back wrench does not shift during the disassembly process.

[0042] Step 5: Perform the disassembly operation; the operator moves away from the work area and moves the booster operating handle 8 back and forth. The 70MPa high-pressure power output by the booster drives the hydraulic wrench to rotate, gradually completing the screw disassembly; after the single screw is disassembled, follow the above steps to disassemble the remaining non-diagonal screws in sequence, and finally disassemble the four diagonal screws; repeat the operation until all target screws are disassembled.

[0043] This invention achieves 70MPa high-pressure power output and is compatible with various working heads, such as wrenches and breakers, covering multiple scenarios such as wellhead screw disassembly, sucker rod shearing, and flange separation.

[0044] Connect the booster to the workover rig and hydraulic wrench. The booster's hydraulic lines increase the low pressure on the workover rig to high pressure. Combined with the backing wrench, backing work can be performed without operator intervention. After inserting the nut, press the set screw 15 against the nut and release. When the screw rotates, the irregularly shaped bent handle 14 can press against the adjacent screw to prevent rotation, achieving unmanned backing work.

[0045] Low-pressure oil is input through port P1 → throttle valve 2 and pressure regulating relief valve 3 are adjusted → operating control valve 4 is activated → the oil passes through filter 5 and booster, then outputs pressurized oil through port A of the oil circuit block → this activates the actuator, and the actuator outputs return oil to the pressurizing device → through the booster, filter 5, and reversing valve back to the oil tank → the system outputs A-direction pressurization complete. Reverse operation of control valve 4 → pressurized oil is output through port B on the same principle → the actuator outputs return oil through port A to the pressurizing device → oil tank, completing B-direction pressurization → bidirectional pressurization complete.

[0046] The low-pressure hydraulic drive high-pressure output process breaks through the traditional "electric / pneumatic hydraulic pump station" mode. It uses the low-pressure hydraulic system (15MPa) of the workover rig as a power source and achieves pressure amplification through the internal two-stage piston boosting mechanism (piston area ratio 5:1): low-pressure oil enters the first-stage piston chamber to push the second-stage piston to compress, so that the output pressure is linearly increased to 70MPa, and the pressure fluctuation is ≤±2MPa, which meets the requirements of high-intensity disassembly.

[0047] The spark-free operation process uses hydraulic energy to convert mechanical energy throughout the entire process, replacing hot work tools such as gas welding and angle grinders: the hydraulic wrench converts hydraulic energy into torque (maximum 11000 N·m) through a planetary gear reduction mechanism, enabling spark-free rotation and disassembly of screws; the cutter adopts a wedge-shaped blade design, using 70MPa pressure to generate shearing force (≥800kN), instantly separating rusted nuts and avoiding frictional sparks.

[0048] Example 2

[0049] The booster can increase the pressure of the workover rig from 15 MPa to 70 MPa, providing power to the working head. It can be equipped with various working heads, including hydraulic wrenches, hydraulic breakers, sucker rod shears, and flange separators, to achieve multiple functions. The hydraulic wrench uses 70 MPa power to rotate and remove screws, with a torque of up to 11,000 N·m, capable of removing 90% of fastened screws; the hydraulic breaker is used for screws in confined spaces or where removal is impossible, cutting nuts to separate screws; the sucker rod shear can cut the sucker rod within 5 seconds; and the flange separator provides 30t of separation pressure at 70 MPa working pressure to separate stuck flanges.

[0050] It avoids the safety risks associated with traditional disassembly methods, such as fires, explosions, and injuries caused by tool damage, thus ensuring the safety and health of on-site operators.

[0051] In high-voltage areas, to avoid danger to operators, a matching auxiliary back wrench is designed to assist in the removal of screws without human assistance.

[0052] This invention can solve the problems of screw corrosion, flange adhesion, and sucker rod jamming, improve the efficiency of operation and construction, and eliminate potential safety hazards.

[0053] Before using this invention, connect the booster to the hydraulic power of the workover rig, paying attention to the direction of the connection of inlet 9, outlet 10, inlet / outlet 12, and outlet 13. Then connect the booster to the hydraulic wrench head cutter / shearer according to the working conditions. After successful connection, do not immediately attempt disassembly. Perform a no-load test run three times, observing that the hydraulic power of the workover rig reaches the rated 15 MPa. If the pressure reaches the requirement and the workhead is working normally, proceed with the disassembly. If the workhead is not working normally, adjust the direction of the inlet / outlet pipelines of the workover rig and continue testing. If the workover rig pressure does not reach 15 MPa, adjust the opening and closing degree of the workover rig's overflow valve. After everything is properly adjusted, install the hydraulic wrench on the screw to be removed. Select any screw except the four diagonal screws. The operator installs the matching backing wrench on the bottom backing, secures it firmly, and then moves away before operating the booster handle to perform the disassembly operation.

[0054] The embodiments described above are merely preferred embodiments of the present invention, and not all feasible embodiments of the present invention. For those skilled in the art, any obvious modifications made without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims. Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no technical conflict, the features in the embodiments disclosed in the present invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-efficiency dismantling device for well workover operations based on a hydraulic booster system, characterized in that, It includes a booster and a back-tightening wrench; the booster includes a housing, inside which are installed an oil circuit core (1), a throttle valve (2), an overflow valve (3), a control valve (4), and a filter (5), and outside the housing are a booster module (7), an operating handle (8), an input inlet (9), an input outlet (10), a pressure testing interface (11), an output inlet (12), and an output outlet (13), the operating handle (8) is connected to the control valve (4), and the booster module (7) is connected to the filter (5); the back-tightening wrench includes a bending handle (14), and the head of the bending handle (14) is connected to a set screw (15).

2. The efficient dismantling device for well workover operations based on a hydraulic booster system according to claim 1, characterized in that, The head of the bending handle (14) is a hollow hexagonal structure.

3. The efficient dismantling device for well workover operations based on a hydraulic booster system according to claim 1, characterized in that, The head outer wall of the bending handle (14) is provided with several set screw holes evenly spaced apart.

4. The efficient dismantling device for well workover operations based on a hydraulic booster system according to claim 1, characterized in that, There is one set screw (15).

5. An operation method for a high-efficiency disassembly device for well workover operations based on a hydraulic booster system, characterized in that: The disassembly device according to any one of claims 1-4 includes the following steps: Step 1: Device connection preparation; Step 2: No-load test and pressure confirmation; Step 3: Install and position the hydraulic wrench; Step 4: Secure with a back wrench; Step 5: Perform the disassembly operation.

6. The operation method of the high-efficiency dismantling device for well workover operations based on a hydraulic booster system according to claim 5, characterized in that, In step one, with the workover rig in the off state, remove the original hydraulic wrench pipeline; connect the hydraulic power end of the workover rig to the input inlet (9), input outlet (10), output inlet (12), and output outlet (13) of the booster, ensuring good sealing of the interface; connect the hydraulic wrench to the output inlet (12) and output outlet (13) of the booster according to the hydraulic wrench inlet and outlet pipe markings, check the pipeline connection firmness, and avoid loosening or leakage.

7. The operation method of the high-efficiency dismantling device for well workover operations based on a hydraulic booster system according to claim 5, characterized in that, Step two involves starting the workover rig and opening the six-way valve power switch to put the hydraulic system into operation. With the hydraulic wrench unloaded, move the booster operating handle (8) and observe whether the hydraulic wrench rotates normally. If the hydraulic wrench rotates normally, it indicates that the pipeline connection is correct. If the hydraulic wrench does not rotate or rotates in the opposite direction, the inlet and outlet directions of the hydraulic pipeline of the workover rig need to be adjusted and the test repeated. After the pipeline connection is correct, observe the hydraulic power gauge of the workover rig to confirm that the pressure meets the working requirements.

8. The operation method of the high-efficiency dismantling device for well workover operations based on a hydraulic booster system according to claim 5, characterized in that, In step three, after confirming that the pressure is normal, put the hydraulic wrench on the screw to be removed; manually adjust the position of the hydraulic wrench so that it is close to the nearby screw cap, ensuring a stable connection between the hydraulic wrench and the screw, and avoiding slippage during disassembly.

9. The operation method of the high-efficiency dismantling device for well workover operations based on a hydraulic booster system according to claim 5, characterized in that, In step four, place the back wrench at the lower end of the screw to be removed, tighten the set screw on the back wrench to make it press against the screw nut; adjust the position of the back wrench handle so that it is attached to the nearby screw nut as a fixed fulcrum to ensure that the back wrench does not shift during the disassembly process.

10. The operation method of the high-efficiency dismantling device for well workover operations based on a hydraulic booster system according to claim 5, characterized in that, In step five, the operator moves away from the work area and moves the booster operating handle (8) back and forth. The high-pressure power output by the booster drives the hydraulic wrench to rotate, and the screw is gradually removed. After removing a single screw, follow the steps above to remove the remaining non-diagonal screws in sequence, and finally remove the four diagonal screws; repeat the operation until all target screws have been removed.

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