How to use a hydraulic sleeve loosener

Abstract

This invention discloses a method for using a hydraulic casing loosener, comprising a loosener including a connecting sleeve, a fixed arc-shaped clamping plate, and a movable arc-shaped clamping plate. Corresponding rod holes are provided at the top and bottom of the fixed and movable arc-shaped clamping plates. A piston rod is disposed between the rod holes of the fixed and movable arc-shaped clamping plates. The piston rod includes a sleeve, an inner rod, and a tension spring. One end of the sleeve is welded to one end of the rod hole in the fixed arc-shaped clamping plate, one end of the inner rod is inserted into the sleeve, and the other end of the inner rod is welded to one end of the rod hole in the movable arc-shaped clamping plate. The assembly consisting of the connecting sleeve, the fixed arc-shaped clamping plate, and the movable arc-shaped clamping plate provides a casing loosening mechanism for personnel in oil well operations. Utilizing hydraulic pressure as power, the entire device clamps and loosens the casing. It also features a good hoisting and retrieval mechanism, facilitating better downhole casing laying operations.

Description

Technical Field

[0001] This invention belongs to the field of petroleum technology, specifically relating to the method of using a hydraulic casing loosener. Background Technology

[0002] Oil casing is a steel pipe used to support the wellbore of oil and gas wells to ensure the drilling process and the normal operation of the entire well after completion. In downhole oil operations, personnel are required to transport or hoist casing, rods, and other components downhole.

[0003] Current oil casing hoisting mechanisms are inconvenient to use, lacking effective clamping and loosening mechanisms, which hinders personnel from flexibly loosening and deploying the hoisted casing. Therefore, we propose a method for using a hydraulic casing loosener. Summary of the Invention

[0004] The purpose of this invention is to provide a method for using a hydraulic sleeve loosener to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for using a hydraulic sleeve loosener, comprising a loosener, the loosener comprising a connecting sleeve, a fixed arc-shaped clamping plate and a movable arc-shaped clamping plate, corresponding rod holes being provided at the top and bottom of the fixed arc-shaped clamping plate and the movable arc-shaped clamping plate, a piston rod being provided between the rod holes of the fixed arc-shaped clamping plate and the movable arc-shaped clamping plate, the piston rod comprising a sleeve, an inner rod and a tension spring, one end of the sleeve being welded to one end of the rod hole of the fixed arc-shaped clamping plate, one end of the inner rod being inserted into the sleeve, the other end of the inner rod being welded to one end of the rod hole of the movable arc-shaped clamping plate, the tension spring being sleeved on the inner rod, both ends of the tension spring being inserted into the rod holes of the fixed arc-shaped clamping plate and the movable arc-shaped clamping plate, both ends of the tension spring being welded to the rod holes of the fixed arc-shaped clamping plate and the movable arc-shaped clamping plate respectively, a tee connector and a pressure relief sleeve being respectively installed and connected at both ends of the connecting sleeve, and drain ports being provided on both sides of the pressure relief sleeve.

[0006] Furthermore, a liquid inlet is provided at the inner end of the rod hole of the fixed arc-shaped clamp, one end of the sleeve is connected to the liquid inlet, an inlet is provided at the end of the fixed arc-shaped clamp, one side of the tee connector is connected to one side of the pressure relief sleeve via a pipe, and a one-way valve is installed at the connection between the tee connector and the connecting pipe via a flange.

[0007] Furthermore, a cylindrical plug is inserted into the pressure relief sleeve. A spring is welded to one end of the cylindrical plug, and a connecting post is welded to the other end of the cylindrical plug. The connecting post is located inside the spring. A powerful magnetic block is installed at one end of the connecting post by bolts. A pushing port for pushing the powerful magnetic block is opened at the end of the pressure relief sleeve. Both ends of the spring are welded to the cylindrical plug and one end of the pressure relief sleeve, respectively.

[0008] Furthermore, one end of the connecting sleeve is welded to the fixed arc-shaped clamp, and a lifting hole is provided on the top periphery of the connecting sleeve.

[0009] The specific steps are as follows:

[0010] Step 1: Take two sets of hydraulic booster pumps, and then connect the discharge end of the pumps to the ends of the tee and the pressure relief sleeve through pipes;

[0011] Step 2: The first set of hydraulic booster pumps pressurizes the three-way joint. The water pressure flows into the piston rod through the inlet, causing the inner rod of the piston rod to push the moving arc-shaped clamp plate, thus separating the moving arc-shaped clamp plate from the fixed arc-shaped clamp plate.

[0012] Step 3: Place the separated fixed arc-shaped clamp and moving arc-shaped clamp on both sides of the threaded end of the oil casing to be clamped and hoisted. Then, the first set of hydraulic booster pumps stops pressurizing, and the second set of hydraulic booster pumps pressurizes and supplies water to the pressure relief sleeve. The water pressure flows into the pressure relief sleeve and pushes the cylindrical plug, causing the cylindrical plug to push against the spring spring and move away from the seal on the drain port. At this time, the pressure inside the pressure relief sleeve is lower than the pressure inside the tee joint, so that the tee joint and piston rod are depressurized. Based on the elastic pull of the tension spring between the rod holes of the fixed arc-shaped clamp and the moving arc-shaped clamp, a tight elastic closure is achieved between the fixed arc-shaped clamp and the moving arc-shaped clamp, thus clamping the oil casing.

[0013] Step 4: Secure the lifting rope inside the lifting hole of the connecting sleeve so that the oil casing can be lifted and moved synchronously with the connecting sleeve when the connecting sleeve is lifted or when the connecting sleeve is lowered into the wellbore.

[0014] Step 5: Insert the oil casing and connecting sleeve into the working well. After lowering the oil casing to the required position, personnel will pressurize the tee joint again using the first set of hydraulic booster pumps to separate the fixed arc clamp and the moving arc clamp, thereby loosening and detaching the oil casing from the fixed arc clamp and the moving arc clamp. Then, use ropes to pull the connecting sleeve back and collect it.

[0015] Furthermore, the discharge outlet has a flow rate greater than the supply capacity of the two sets of hydraulic booster pumps.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the assembly consisting of a connecting sleeve, a fixed arc-shaped clamping plate, and a moving arc-shaped clamping plate provides personnel with a casing hoisting and loosening mechanism for oil well operations. Utilizing water pressure as power, the entire device can clamp and loosen the casing. The assembly also has a good hoisting and recovery mechanism, which helps personnel to better carry out downhole pipe laying operations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the hydraulic sleeve loosener of the present invention.

[0018] Figure 2 This is a schematic diagram of the connecting sleeve structure for the use of the hydraulic sleeve loosener of the present invention.

[0019] Figure 3 This is a schematic diagram of the fixed arc-shaped clamping plate structure for the use of the hydraulic sleeve loosener of the present invention.

[0020] Figure 4 This is a schematic diagram of the three-way connector structure for the use of the hydraulic sleeve loosener of the present invention.

[0021] Figure 5 This is a schematic diagram of the cylindrical plug structure for the use of the hydraulic sleeve loosener of the present invention.

[0022] Figure 6 This is a schematic diagram of the inner structure of the moving arc-shaped clamp in the method of using the hydraulic sleeve loosener of the present invention.

[0023] Figure 7 This is a schematic diagram of the sleeve structure for the use of the hydraulic sleeve loosener of the present invention.

[0024] Figure 8 This is a schematic diagram of the pressure relief sleeve end structure of the hydraulic sleeve loosener of the present invention.

[0025] In the diagram: 1. Connecting sleeve; 2. Fixed arc-shaped clamping plate; 3. Moving arc-shaped clamping plate; 4. Piston rod; 5. Lifting hole; 6. Rod hole; 7. Sleeve; 8. Piston rod; 9. Tension spring; 10. Liquid inlet; 11. T-joint; 12. Pressure relief sleeve; 13. Liquid outlet; 14. Connecting pipe; 15. Cylindrical plug; 16. Elastic spring; 17. Connecting column; 18. Strong magnetic block; 19. Liquid inlet; 20. Push-top port. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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. Example

[0027] like Figure 1-8As shown, the method of using the hydraulic sleeve loosener includes the loosener, which comprises a connecting sleeve 1, a fixed arc-shaped clamping plate 2, and a movable arc-shaped clamping plate 3. Corresponding rod holes 6 are provided at the top and bottom of the fixed arc-shaped clamping plate 2 and the movable arc-shaped clamping plate 3. A piston rod 4 is disposed between the rod holes 6 of the fixed arc-shaped clamping plate 2 and the movable arc-shaped clamping plate 3. The piston rod 4 includes a sleeve 7, an inner rod 8, and a tension spring 9. One end of the sleeve 7 is welded to one end of the inner rod 8 inside the rod hole 6 of the fixed arc-shaped clamping plate 2. The inner rod 8 is inserted into the sleeve 7. The other end of the inner rod 8 is welded to one end of the rod hole 6 of the moving arc-shaped clamping plate 3. The tension spring 9 is sleeved on the inner rod 8. The two ends of the tension spring 9 are inserted into the rod holes 6 of the fixed arc-shaped clamping plate 2 and the moving arc-shaped clamping plate 3. The two ends of the tension spring 9 are welded to the rod holes 6 of the fixed arc-shaped clamping plate 2 and the moving arc-shaped clamping plate 3, respectively. The two ends of the connecting sleeve 1 are respectively installed and connected with a three-way connector 11 and a pressure relief sleeve 12. The pressure relief sleeve 12 has drain ports 13 on both sides.

[0028] The fixed arc-shaped clamp 2 has a liquid inlet 19 at the inner end of the rod hole 6. One end of the sleeve 7 is connected to the liquid inlet 19. The fixed arc-shaped clamp 2 has a liquid inlet 10 at its end. One side of the three-way connector 11 is connected to one side of the pressure relief sleeve 12 via a connecting pipe 14. A one-way valve is installed at the connection between the three-way connector 11 and the connecting pipe 14 via a flange. A cylindrical plug 15 is inserted into the pressure relief sleeve 12. A spring 16 is welded to one end of the cylindrical plug 15. A connecting post 17 is welded to one end of the cylindrical plug 15. The connecting post 17 is located inside the spring 16. A strong magnetic block 18 is bolted to one end of the connecting post 17. A pushing port 20 for pushing the strong magnetic block 18 is opened at the end of the pressure relief sleeve 12. The two ends of the spring 16 are welded to the cylindrical plug 15 and one end of the pressure relief sleeve 12, respectively. Figure 4-5 As shown, the cylindrical plug 15 is used to seal the space between the pressure relief sleeve 12 and the tee connector 11. When the cylindrical plug 15 is pressed away from the sealing port of the connecting pipe 14, the pressure in the pressure relief sleeve 12 and the tee connector 11 will be relieved through the drain port 13. With the setting of the strong magnetic block 18, when the cylindrical plug 15 is pressed and displaced towards the end of the pressure relief sleeve 12, the strong magnetic block 18 can achieve magnetic attraction with the inner end of the pressure relief sleeve 12, so that the cylindrical plug 15 remains away from the seal of the drain port 13. When the cylindrical plug 15 needs to be restored to its original sealing state, the personnel push the strong magnetic block 18 through the push port 20 to disengage the strong magnetic block 18 from the magnetic attraction state between it and the end of the pressure relief sleeve 12. During use, the personnel can assemble a magnetic block corresponding to the strong magnetic block 18 on the inner end of the pressure relief sleeve 12.

[0029] One end of the connecting sleeve 1 is welded to the fixed arc-shaped clamping plate 2, and a lifting hole 5 is provided on the top periphery of the connecting sleeve 1; for example Figure 3As shown, the lifting hole 5 facilitates the connection of the hoisting mechanism, such as slings, to the connecting sleeve 1.

[0030] The specific steps are as follows:

[0031] Step 1: Take two sets of hydraulic booster pump sets, and then connect the discharge end of the pump sets to the ends of the tee joint 11 and the pressure relief sleeve 12 through pipes;

[0032] Step 2: The first set of hydraulic booster pumps pressurizes the three-way connector 11. The water pressure flows into the piston rod 4 through the inlet 10, causing the inner rod 8 of the piston rod 4 to push the moving arc-shaped clamp 3, thus separating the moving arc-shaped clamp 3 from the fixed arc-shaped clamp 2.

[0033] Step 3: Place the separated fixed arc-shaped clamp 2 and moving arc-shaped clamp 3 on both sides of the threaded end of the oil casing that needs to be clamped and hoisted. Then, the first set of hydraulic booster pumps stops pressurizing, and the second set of hydraulic booster pumps pressurizes and supplies water to the pressure relief sleeve 12, so that the water pressure flows into the pressure relief sleeve 12 and pushes the cylindrical plug 15, so that the cylindrical plug 15 pushes the spring spring 16 to the position and leaves the blockage of the drain port 13. At this time, the pressure inside the pressure relief sleeve 12 is lower than the pressure inside the tee joint 11, so that the tee joint 11 and the piston rod 4 are depressurized. Based on the elastic pull of the tension spring 9 between the rod holes 6 of the fixed arc-shaped clamp 2 and the moving arc-shaped clamp 3, the fixed arc-shaped clamp 2 and the moving arc-shaped clamp 3 achieve a tight elastic closure, thereby clamping the oil casing.

[0034] Step 4: Secure a lifting rope inside the lifting hole 5 of the connecting sleeve 1 so that the oil casing can be lifted and moved synchronously with the connecting sleeve 1 when the connecting sleeve 1 is lifted or when the connecting sleeve 1 is lowered into the wellbore.

[0035] Step 5: Insert the oil casing and connecting sleeve 1 into the working well. After lowering the oil casing to the required position, personnel will pressurize the tee joint 11 again using the first set of hydraulic booster pumps to separate the fixed arc clamp 2 and the moving arc clamp 3, thereby loosening and detaching the oil casing from the fixed arc clamp 2 and the moving arc clamp 3. Then, use ropes to pull the connecting sleeve 1 back for collection.

[0036] The discharge capacity of the drain outlet 13 is greater than the supply capacity of the two sets of hydraulic booster pumps.

[0037] The working principle and usage process of this invention are as follows: Two sets of hydraulic booster pumps are used. The discharge ends of the pump sets are then connected to the ends of the tee joint 11 and the pressure relief sleeve 12 via pipes. The first set of hydraulic booster pumps pressurizes the tee joint 11. The water pressure flows into the piston rod 4 through the inlet 10, causing the inner rod 8 of the piston rod 4 to push the moving arc-shaped clamp 3, separating the moving arc-shaped clamp 3 from the fixed arc-shaped clamp 2. The separated fixed arc-shaped clamp 2 and moving arc-shaped clamp 3 are placed on both sides of the threaded end of the oil casing that needs to be clamped and hoisted. Then, the first set of hydraulic booster pumps stops pressurizing, and the second set of hydraulic booster pumps pressurizes and supplies water to the pressure relief sleeve 12, causing the water pressure to flow into the pressure relief sleeve 12 and push the cylindrical plug 15. The cylindrical plug 15 pushes the spring spring 16 to a position and moves away from the blockage of the discharge port 13. At this time, the pressure relief sleeve 12... The internal pressure is lower than that of the tee joint 11, causing pressure relief in the tee joint 11 and piston rod 4. Based on the elastic pull of the tension spring 9 between the rod holes 6 of the fixed arc-shaped clamp 2 and the moving arc-shaped clamp 3, a tight elastic closure is achieved between the fixed arc-shaped clamp 2 and the moving arc-shaped clamp 3, clamping the oil casing. A lifting rope is fastened to the lifting hole 5 of the connecting sleeve 1, allowing the oil casing to move synchronously with the connecting sleeve 1 during lifting or when it is lowered into the wellbore. After inserting the oil casing and connecting sleeve 1 into the working well and lowering it to the desired position, personnel again pressurize the tee joint 11 using the first set of hydraulic booster pumps, separating the fixed arc-shaped clamp 2 and the moving arc-shaped clamp 3, thus loosening and detaching the oil casing from them. The connecting sleeve 1 is then pulled back and collected using ropes.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for using a hydraulic sleeve loosener, including the loosener, characterized in that, The loosening device includes a connecting sleeve (1), a fixed arc-shaped clamping plate (2), and a movable arc-shaped clamping plate (3). Corresponding rod holes (6) are provided at the top and bottom of the fixed arc-shaped clamping plate (2) and the movable arc-shaped clamping plate (3). A piston rod (4) is provided between the rod holes (6) of the fixed arc-shaped clamping plate (2) and the movable arc-shaped clamping plate (3). The piston rod (4) includes a sleeve (7), an inner rod (8), and a tension spring (9). One end of the sleeve (7) is welded to one end of the rod hole (6) of the fixed arc-shaped clamping plate (2), and one end of the inner rod (8) is inserted into the sleeve (7). The other end of the inner rod (8) is welded to one end of the rod hole (6) of the moving arc-shaped clamp (3). The tension spring (9) is sleeved on the inner rod (8). The two ends of the tension spring (9) are inserted into the rod holes (6) of the fixed arc-shaped clamp (2) and the moving arc-shaped clamp (3). The two ends of the tension spring (9) are welded to the rod holes (6) of the fixed arc-shaped clamp (2) and the moving arc-shaped clamp (3) respectively. The two ends of the connecting sleeve (1) are respectively installed and connected with a three-way connector (11) and a pressure relief sleeve (12). The pressure relief sleeve (12) has drain ports (13) on both sides respectively. The rod hole (6) of the fixed arc-shaped clamp (2) is provided with a liquid inlet (19) at the inner end. One end of the sleeve (7) is connected to the liquid inlet (19). The end of the fixed arc-shaped clamp (2) is provided with a liquid inlet (10). One side of the three-way connector (11) is connected to the end of the pressure relief sleeve (12) through a pipe and a connecting pipe (14). A one-way valve is installed at the connection between the three-way connector (11) and the connecting pipe (14) through a flange. A cylindrical plug (15) is inserted inside the pressure relief sleeve (12). A spring (16) is welded to one end of the cylindrical plug (15). A connecting post (17) is welded to one end of the cylindrical plug (15). The connecting post (17) is located inside the spring (16). A strong magnetic block (18) is installed at one end of the connecting post (17) by bolts. A pushing port (20) for pushing the strong magnetic block (18) is opened at the end of the pressure relief sleeve (12). The two ends of the spring (16) are welded to the cylindrical plug (15) and one end inside the pressure relief sleeve (12), respectively. One end of the connecting sleeve (1) is welded to the fixed arc-shaped clamp (2), and a lifting hole (5) is provided on the top periphery of the connecting sleeve (1). The specific steps are as follows: Step 1: Take two sets of hydraulic booster pump sets, and then connect the discharge end of the pump sets to the ends of the tee joint (11) and the pressure relief sleeve (12) through pipes; Step 2: The first set of hydraulic booster pumps increases the pressure inside the three-way connector (11). The water pressure flows into the piston rod (4) through the inlet (10), causing the inner rod (8) of the piston rod (4) to push the moving arc-shaped clamp (3) and separate the moving arc-shaped clamp (3) from the fixed arc-shaped clamp (2). Step 3: Place the separated fixed arc-shaped clamp (2) and moving arc-shaped clamp (3) on both sides of the threaded end of the oil casing that needs to be clamped and hoisted. Then, the first set of hydraulic booster pumps stops pressurizing, and the second set of hydraulic booster pumps pressurizes and supplies water to the pressure relief sleeve (12), so that the water pressure flows into the pressure relief sleeve (12) and pushes the cylindrical plug (15), so that the cylindrical plug (15) pushes the spring spring (16) to the position and moves away from it. When the drain port (13) is blocked, the pressure inside the pressure relief sleeve (12) is lower than the pressure inside the tee joint (11), so that the pressure inside the tee joint (11) and the piston rod (4) is relieved. Based on the elastic pull of the tension spring (9) on the rod hole (6) of the fixed arc clamp (2) and the moving arc clamp (3), a tight elastic closure is achieved between the fixed arc clamp (2) and the moving arc clamp (3), so as to tighten the oil casing. Step 4: Install a lifting rope inside the lifting hole (5) of the connecting sleeve (1) so that the oil casing can be lifted and moved synchronously with the connecting sleeve (1) when the connecting sleeve (1) is lifted or when the connecting sleeve (1) is lifted into the well. Step 5: Insert the oil casing and connecting sleeve (1) into the working well. After lowering the oil casing to the required position, the personnel will again use the first set of hydraulic booster pumps to increase the pressure inside the tee joint (11), so that the fixed arc clamp (2) and the moving arc clamp (3) are separated, thereby loosening and separating the oil casing from the fixed arc clamp (2) and the moving arc clamp (3). Then, the connecting sleeve (1) is pulled back and collected using ropes.

2. The method of using the hydraulic sleeve loosener according to claim 1, characterized in that: The discharge outlet (13) has a flow rate greater than the supply of the two sets of hydraulic booster pumps.

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