Hydraulic puncher for coiled tubing

Abstract

The utility model discloses a hydraulic puncher for a coiled tubing for drilling in a sleeve, which comprises an upper joint connected with an upper piston outer cylinder through threads, an upper piston mounted in the upper piston outer cylinder and provided with an air hole a, a lower piston outer cylinder connected with the upper piston outer cylinder through threads, a lower piston mounted in the lower piston outer cylinder and provided with an air hole a, and a lower joint connected with the lower piston outer cylinder through threads. The lower piston is in contact with the upper piston, a locking block is mounted on an outer cylinder of the lower piston, a shear pin is mounted on an outer shear cylinder, an outer release cylinder is sleeved on the outer shear cylinder and is locked by a screw, the lower end of the outer release cylinder is in threaded connection and locked with an outer eccentric cylinder, the lower piston is in threaded connection and locked with a chute mandrel, a T-shaped chute is formed in the chute mandrel, and the lower piston is in threaded connection and locked with the chute mandrel. The sliding groove is obliquely downward, the included angle between the sliding groove and the horizontal direction is 3 degrees, an executing mechanism is installed on the sliding groove, and the executing mechanism finally achieves punching in the casing pipe. And compared with traditional punching, operation is easy, efficiency is high, cost is low, and difficulty is small.

Description

Technical Field

[0001] The invention relates to the field of coiled tubing tools, and in particular to a hydraulic puncher for coiled tubing. Background Art

[0002] With the continued development of unconventional oil and gas fields and the increasing number of reservoir stimulation and production enhancement operations, oil and gas field workover operations are on the rise. Coiled tubing (CT) operations are gaining popularity among oilfield users, gaining a foothold in the market. Workover and completion operations account for over 75% of CT revenue, and CT's application continues to expand across oil and gas fields worldwide. The advantages and value of CT, such as underbalanced operations under pressure, rapid and efficient operation, minimal damage to formations, and low costs, are truly being recognized. Subsequently, CT has been widely used in oil and gas field workover, drilling, completion, and logging operations, playing an increasingly important role in oil and gas field exploration and development.

[0003] When a cavity between the downhole casing and the formation requires cement filling, a through hole is drilled from the inside of the casing to inject cement for filling. This is also the case when reservoir transformation requires drilling holes in the casing. Conventional methods in the art use ammunition perforation or chemical perforation. Ammunition perforation involves lowering a drill pipe connected to a perforating tool into position and detonating ammunition to perforate the casing. Alternatively, an acid nozzle is connected to the drill pipe to perforate the casing.

[0004] In existing drilling techniques, connecting the drill pipe to the perforation site requires connecting a lead wire to the perforation location. During the perforation process, the explosive force generated by the ammunition is powerful, causing uncontrollable damage to the casing, often leading to major safety accidents such as casing ruptures. The use of chemical fluids to corrode the casing also introduces new problems, not only accelerating the corrosion of the drill tool and casing, but also requiring large amounts of circulating fluid to flush the bottom of the well to ensure the working fluid has the appropriate pH level. Finally, the working fluid must be disposed of after the operation. Both of these methods are subject to high construction risks, difficult control, and extensive follow-up work.

[0005] The above problems can be effectively solved by using a coiled tubing connected to a coiled tubing puncher to perform drilling operations inside the casing. Summary of the Invention

[0006] The present invention provides a hydraulic perforator for coiled tubing used for drilling holes in casing. Utilizing a hydraulic principle, after the coiled tubing connecting tool is lowered to the target location, only ground pressure is required to complete the drilling. After drilling is complete, the tool string can be easily removed by lifting it. This reduces operational risk, ensures precise drilling locations, creates a beautiful hole shape, and minimizes damage to the casing. Compared to traditional casing drilling methods, this method offers a simpler, more efficient, lower-cost, and less complex operation.

[0007] The technical solution adopted by the present invention is a hydraulic puncher for continuous oil tubing, which is a continuous oil tubing tool connected by continuous oil tubing. After connection, it is lowered to the target position underground and drilling is achieved in the casing through fluid hydraulic drive. After drilling is completed, the tubing string is lifted to complete the recovery of the tool. A hydraulic perforator for a coiled tubing, the structure of which mainly includes: an upper joint at the top is connected to a coiled tubing connector, the upper joint is connected to an upper piston outer tube through a thread, a sealing ring a is provided between the upper joint and the upper piston outer tube for sealing between the two, and a screw a is provided between the upper joint and the piston outer tube to prevent the threads of the two from loosening, an upper piston is installed in the upper piston outer tube, a sealing ring b is provided on the upper piston, and the upper piston plays a sealing role when sliding in the upper piston outer tube, an air vent a is provided on the upper piston outer tube, and a sealing ring c is also provided at the lower contact point between the upper piston outer tube and the upper piston, the lower piston outer tube is connected to the upper piston outer tube through a thread, and the two are provided with a sealing ring d and a screw b, a lower piston is installed in the lower piston outer tube, and contacts with the upper piston, and a sealing ring d is also provided between the lower piston and the lower piston outer tube. A locking block is mounted on the lower piston outer tube, locking both the lower piston outer tube and the shear outer tube. The shear outer tube has a hole a for a shear pin, which locks the shear outer tube to the lower piston and is tightened with screw c. The release outer tube fits over the shear outer tube and is locked with screw d. The release outer tube is threadedly connected to the lowermost eccentric outer tube and secured with screw e. The lower piston is threadedly connected to the chute core shaft and secured with screw f. The chute core shaft has a chute, which houses an actuator, ultimately enabling drilling within the casing.

[0008] The actuator of a hydraulic puncher for continuous oil tubing slides on a slide, including a T-shaped slider, on which a punch is installed. The T-shaped slider is pressed on the T-shaped slider with a pressure plate and fastened with bolts. The lower end of the slide core shaft under the actuator is provided with a T-shaped back support block, and side straightening blocks are provided at both ends to ensure that the puncher is located in the center of the oil tubing and can be effectively supported and fixed during the punching process.

[0009] The present invention is also characterized in that:

[0010] A hydraulic perforator for coiled tubing uses a surface pump to circulate hydraulic pressure for drilling. Once the coiled tubing tool is lowered to the target location, only surface pressure is required to complete the drilling of the casing. Once drilling is complete, the tool can be removed by lifting the tool string. The process is simple and easy to operate.

[0011] This tool can judge the downhole drilling operation status by observing the pump pressure through ground pressure. The two-stage piston greatly increases the force-bearing area. When the pump is turned on to pressurize on the ground, the liquid in the cavity accumulates energy and the pressure continues to increase until the pin is sheared off and the operation begins. Then the pressure is continued and the punch of the actuator can realize drilling on the casing.

[0012] After the tool has completed the previous step of drilling, the punch is driven into the casing. The punch needs to be removed and the tool can be recovered. This is accomplished by simply lifting the tool. When the tool is lifted, the shear sleeve and lower piston sleeve are disengaged. The lower piston sleeve drives the lower piston and the chute core shaft upward, causing the actuator to retract within the T-slot. The punch is then removed from the casing. Finally, the actuator, eccentric sleeve, and the entire tool string are lifted and recovered.

[0013] The beneficial effects of the present invention are:

[0014] The hydraulic puncher for coiled tubing of the present invention does not require mechanical rotation and ball throwing operations, but only adopts the hydraulic principle. During operation, it is only necessary to lower the coiled tubing connecting tool to a suitable position and then pressurize the ground to complete the drilling of the casing.

[0015] The hydraulic puncher for continuous oil tubing of the present invention can easily recover the tool by lifting the tool string after the operation is completed. There is no risk of the tool getting stuck or falling. The construction risk is small, the punching position is accurate, the hole shape is beautiful, and the casing will not be excessively damaged.

[0016] The hydraulic puncher for continuous oil tubing of the present invention has low requirements for pump pressure and flow rate under the action of the double-stage piston structure during operation, and can observe whether the operation is completed by observing the ground pump pressure. The operation process is simple and does not require a complex operation tool string. Compared with the traditional method of punching holes in casing, the operation process is simple, efficient, low cost, and less difficult, and there is no subsequent redundant operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural principle diagram of a hydraulic puncher for coiled tubing in a non-working state according to the present invention;

[0018] Figure 2 This is a structural principle diagram of a hydraulic puncher for coiled tubing in the present invention in a working punching state;

[0019] Figure 3 This is the schematic diagram of the installation structure of the actuator and support block;

[0020] Figure 4 It is the structural principle diagram of the actuator;

[0021] Figure 5 This is the structural principle diagram of the eccentric outer cylinder;

[0022] Figure 6 It is the structural diagram of the slide mandrel;

[0023] In the figure, 1. upper joint, 2. screw 1, 3. upper piston outer tube, 4. sealing ring a, 5. sealing ring b, 6. upper piston, 7. screw 2, 8. sealing ring c, 9. sealing ring d, 10. lower piston outer tube, 11. sealing ring e, 12. lower piston, 13. locking block, 14. shear outer tube, 15. shear pin, 16. screw 3, 17. screw 4, 18. release outer tube, 19. screw 5, 20. screw 6, 21. eccentric outer tube; 22. slideway core shaft; 23. actuator (23-1. T-type slider; 23-2. pressure plate; 23-3. punch; 23-4. bolt); 24. back support block; 25. side straightening block; 26. bolt. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] The present invention discloses a hydraulic puncher for coiled tubing, the structure of which is as follows: Figure 1 As shown, the upper joint 1 at the top is connected to the continuous tubing connector. It is threadedly connected to the upper piston outer tube 3. A sealing ring a4 is provided between the upper joint 1 and the upper piston outer tube 3 to provide a seal. Screws a2 are provided between the upper joint 1 and the upper piston outer tube to prevent the threads from loosening. An upper piston 6 is mounted within the upper piston outer tube 3. A sealing ring b5 is provided on the upper piston 6 to provide a seal between the upper piston 6 and the upper piston outer tube 3 as it moves. The upper piston outer tube 3 is provided with a vent hole a. A sealing ring c8 is also provided at the lower contact point between the upper piston outer tube 3 and the upper piston 6. A lower piston outer tube 10 is threadedly connected to the upper piston outer tube 3. A sealing ring d9 and screws b7 are provided between the two. A lower piston 12 is mounted within the lower piston outer tube 10, contacting the upper piston 6. A sealing ring d9 is also provided between the lower piston 12 and the lower piston outer tube 10. The lower piston outer tube 10 is equipped with a locking block 13. The locking block 13 contacts the lower piston 12 and locks the lower piston outer tube 10 and the shear outer tube 14. The shear outer tube 14 is provided with a hole a and is equipped with a shear pin 15. The shear pin 15 fixes the shear outer tube 14 and the lower piston 12 and is tightened with a screw c16. The release outer tube 18 is inserted into the shear outer tube 14 and locked with a screw d17. The lower end of the release outer tube 18 is threadedly connected to the eccentric outer tube 21 and locked with a screw e19. The structure of the eccentric outer tube 21 is shown in FIG. Figure 4 As shown, the center hole is not concentric with the outer diameter. The lower piston 12 installed inside is connected to the slideway core shaft 22 through a thread. The structure of the slideway core shaft is as shown in FIG. Figure 6 As shown, and locked with screw f20, a T-shaped slide is provided on the slide core shaft 22, and its structure is as shown Figure 5As shown, the direction of the slide is obliquely downward, with an angle of 3° with the horizontal direction. An actuator 23 is installed on the slide. The actuator 23 is the component that ultimately realizes the drilling operation in the casing. The lower end of the slide core shaft 22 is installed with a bolt g26.

[0026] An actuator 23 of a hydraulic punch for a continuous tubing slides on a slide groove, such as Figure 4 As shown, there is a T-shaped slot on the slot core shaft 22, as shown in FIG. Figure 6 As shown, the T-shaped slider 23-1 is installed in the slide groove, and the two form a sliding pair. A punch 23-3 is installed on the T-shaped slider 23-1. The punch 23-3 is pressed on the T-shaped slider 23-1 by the pressure plate 23-2 and is tightened and fixed with bolts 23-4. A T-shaped back support block 24 is provided at the lower end of the connection between the actuator 23 and the slide groove core shaft 22, and side straightening blocks 25 are also provided on both sides to ensure that the puncher is located in the center of the oil pipe and can be effectively supported and fixed during the punching process.

[0027] The implementation method of the present invention is that during the coiled tubing operation, when it is necessary to perform a punching operation in the casing, the coiled tubing is connected to the upper tool string with a hydraulic puncher and the puncher is lowered to the required position, such as Figure 2 As shown, the fluid is pumped for drilling operation. When the fluid enters the center of the tool from the upper joint 1 along the center of the tool, pressure is generated. At this time, as the pressure of the ground pumped fluid increases, a pressure P is generated in the inner cavity of the tool. The pressure P pushes the upper piston 6 downward, and the fluid enters the hole c and pushes the lower piston 12 downward. The upper piston 6 and the lower piston 12 slide in the upper piston outer tube 3 and the lower piston outer tube 10. The pressure acting on the two pistons continues to increase with the operating pressure of the ground pump, and energy is stored until the lower piston outer tube 3 shears off the pin 15, and the lower piston 12 drives the slide core shaft 22 downward through the thread. At this time, when the slide core shaft 22 moves downward, the actuator 23 and the slide core shaft 22 have a T-shaped slide groove, and the actuator 23 is installed in the square opening opened in the eccentric outer tube 22 At this point, its axial direction is restricted and it can only move along the radial direction of the opening. That is, when the chute core shaft 22 moves downward, the actuator 23 moves radially outward along the notch of the eccentric outer cylinder 22. The spikes 23-3 on the actuator 23 hit the inner wall of the casing. The back support block 24 and the side straightening block 25 at the position of the actuator 22 also expand as the inclined surface of the chute core shaft 22 moves downward, ensuring that the punch is located at the center of the casing annulus. At this time, the fluid circulation is controlled and the pump pressure is slowly increased. The spikes 23-3 continue to be driven into the casing until the two-stage piston moves downward to a certain position, so that the sealing rings of the two pistons enter the lower notches of the two outer cylinders and are no longer sealed. The pumped fluid enters the bypass along the diversion port, and the surface pump pressure drops again. The second pressure relief signal indicates that the punching is completed. The next step is to recover the tool.

[0028] When the tool is recovered, the implementation method is as follows: when the pump pressure is observed on the ground and it is confirmed that a clear signal of completion of the drilling is received, when it is determined that the drilling operation is completed, the continuous pipe hydraulic punch needs to be pulled out of the ground. At this time, it is only necessary to lift the entire tool string. When lifting the continuous pipe hydraulic punch, the punch is implemented in the following way: when the drilling operation is completed, the upper piston 6 and the lower piston 12 are threadedly connected with the slide core shaft 22 and move together to the lower end. The slide core shaft 22 extends downwardly from the eccentric outer cylinder 21. The upper outer diameter of the lower piston 12 is smaller. At this time, it has moved to the locking block 13. At this time, the locking block 13 is retracted inwardly (if it cannot be retracted naturally, the inclined surface of the locking block 13 will be retracted when it is lifted). Please refer to Figure 2 , the lower piston outer tube 10 and the shear outer tube 14 are no longer locked by the locking block 13. At this time, the pipe string is lifted up, and the upper joint 1 is fixedly connected with the upper piston outer tube 3 and the lower piston outer tube 10 in sequence through threads. When the pipe string is lifted up, it moves upward, and the shear outer tube 14 is separated from the lower piston outer tube 10. The lower piston outer tube 10 finally drives the lower piston 12 upward together. Figure 6 As shown, the slide core shaft 22 is pulled upward by the lower piston 12 by the thread. At this time, the spike 22-3 on the actuator 23 has been nailed into the casing. When the slide core shaft 22 is pulled up, under the action of the T-type slide, the spike 22-3 can only be retracted from the casing, and the part of the slide core shaft 22 extending out of the eccentric outer cylinder 21 begins to be retracted, and the back support block 24 and the side straightening block 25 at the position of the actuator 22 are also loosened. When the spike 22-3 is retracted, it continues to be pulled up. When the actuator 23 moves along the T-type slide, it is blocked by the tail bolt 26. At this time, the spike 22-3 on the actuator 23 has been pulled out and is no longer restrained. It is then lifted out together with the slide core shaft 22. When the actuator 22 moves upward, it is blocked by the eccentric outer cylinder 21. At this time, all components are no longer restrained, and are lifted out of the wellhead together under the upward pulling force of the pipe string to complete the recovery.

Claims

1. A hydraulic perforator for coiled tubing, characterized by: The upper joint (1) at the top is connected to the continuous pipe connector. The upper joint (1) is connected to the upper piston outer tube (3) through a thread. At the same time, a sealing ring a (4) is provided between the upper joint (1) and the upper piston outer tube (3) for sealing between the two. At the same time, a screw a (2) is provided between the upper joint (1) and the upper piston outer tube to prevent the threads of the two from loosening. An upper piston (6) is installed in the upper piston outer tube (3). A sealing ring b (5) is provided on the upper piston (6). When the upper piston (6) moves in the upper piston outer tube (3), the two pistons are The two are sealed, and a vent hole a is provided on the upper piston outer tube (3). At the same time, a sealing ring c (8) is also provided at the lower contact point between the upper piston outer tube (3) and the upper piston (6). The lower piston outer tube (10) is connected to the upper piston outer tube (3) by a thread, and the two are provided with a sealing ring d (9) and a screw b (7). The lower piston outer tube (10) is installed with a lower piston (12). The lower piston (12) is in contact with the upper piston (6). A sealing ring d is also provided between the lower piston (12) and the lower piston outer tube (10). (9), a locking block (13) is installed on the lower piston outer tube (10), and the locking block (13) contacts the lower piston (12) and locks the lower piston outer tube (10) and the shear outer tube (14). The shear outer tube (14) is provided with a hole a and is provided with a shear pin (15). The shear pin (15) fixes the shear outer tube (14) and the lower piston (12) and is tightened with a screw c (16). The release outer tube (18) is inserted into the shear outer tube (14) and is locked with a screw d (17). The lower end of the cylinder (18) is threadedly connected to the eccentric outer cylinder (21) and locked with a screw e (19). The center hole of the eccentric outer cylinder (21) is not concentric with the outer diameter. The lower piston (12) installed inside is threadedly connected to the slide core shaft (22) and locked with a screw f (20). The slide core shaft (22) is provided with a T-shaped slide. The slide direction is obliquely downward and has an angle of 3° with the horizontal direction. An actuator (23) is installed on the slide. The actuator (23) is the component that finally realizes the drilling operation in the casing.

2. The hydraulic perforator for coiled tubing according to claim 1, characterized in that: The actuator (23) is installed in the T-shaped slide, wherein the T-shaped slide on the slide core shaft (22) is connected to the T-shaped slider (23-1), and the two are formed into a sliding pair. A punch (23-3) is installed on the T-shaped slider (23-1), and the punch (23-3) is pressed on the T-shaped slider (23-1) by the pressure plate (23-2) and is tightened and fixed with bolts (23-4). A T-shaped back support block (24) is provided at the lower end of the connection between the actuator (23) and the slide core shaft (22), and side straightening blocks (25) are also provided on both sides to ensure that the puncher is located at the center of the oil pipe and can be effectively supported and fixed during the punching process.

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