Oil casing pipe punching device

Abstract

The invention discloses an oil casing pipe punching device, and relates to the technical field of oil and gas exploitation related equipment, and the oil casing pipe punching device comprises a punching module which is arranged perpendicular to the axis of an oil casing pipe to be punched and can enter a position to be punched in the oil casing pipe; the punching module is provided with a punching punch, and the punching punch can move in a reciprocating mode in the radial direction of the oil casing pipe, so that extrusion punching of the side wall of the oil casing pipe is achieved. The driving assembly is used for providing power for reciprocating motion of the punching punch. The oil casing pipe punching device is low in cost, and potential safety hazards can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas mining related equipment, in particular to an oil casing drilling device. Background Art

[0002] During the extraction of oil and natural gas, after the well is drilled and cemented, the oil and gas reservoir and the production pipe are separated by oil casing. In order to ensure that circulation can be established between the oil casing and the annulus during downhole operations of the oil and gas well, perforation technology must be used to penetrate the oil casing, that is, to perforate the oil casing. After perforation, high-pressure liquid and solid proppant can be transported through the wellbore to fracture the oil and gas reservoir, thereby releasing the oil and gas resources stored in the formation. The released oil and gas resources then enter the wellbore through the hole, and finally oil and gas extraction is carried out through the lifting process.

[0003] In the prior art, oil casing is primarily perforated with gunpowder, typically using a perforating gun. During perforating gun operation, the gun is lowered into the target formation to be perforated via a cable or continuous tubing. The cable detonates a detonator, or the continuous tubing pressurizes and detonates a pressure initiator connected to the continuous tubing, which in turn detonates the detonating cord and the perforating charges in the charge carrier. The metal jet from the perforating charge penetrates the corresponding external blind holes in the gun body, as well as the tubing and the center tube of the packer, thereby connecting the tubing and casing. However, perforating with a perforating gun presents certain safety risks and is relatively expensive. Therefore, there is an urgent need for a technical solution that is both cost-effective and can mitigate safety risks. Summary of the Invention

[0004] The purpose of the present invention is to provide an oil casing drilling device to solve the problems existing in the above-mentioned prior art, with low cost and the ability to reduce safety hazards.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an oil casing perforating device, comprising:

[0007] The punching module is arranged perpendicular to the axis of the oil casing to be punched and can enter the oil casing to the position where the hole is to be punched; the punching module has a punching punch that can reciprocate along the radial direction of the oil casing to achieve extrusion and punching of the side wall of the oil casing and withdraw from the punched hole after the punching is completed. The present invention uses the punching punch to successfully punch a hole in one extrusion, and has a high punching efficiency.

[0008] The driving assembly is used to provide power for the reciprocating movement of the punching head.

[0009] Preferably, the punching module also includes a punching joint, which is provided with a cavity and has an open end; a punching piston is movably provided in the cavity of the punching joint, and the punching piston is in contact and sealed with the inner wall of the cavity of the punching joint; one end of the punching piston is connected to the punching punch, and the punching punch is movably provided at the open end of the punching joint; the driving assembly can pass a driving medium into the cavity of the punching joint, and the driving medium can drive the punching piston to move back and forth along the cavity of the punching joint.

[0010] Preferably, a perforating piston rod is integrally formed at one end of the perforating piston, and the outer diameter of the perforating piston rod is smaller than the outer diameter of the perforating piston; the perforating piston rod is connected to the perforating punch at one end away from the perforating piston; a flange is fixedly provided on the inner side wall of the perforating joint close to the opening end, and the flange is in sealing contact with the perforating piston rod; the end of the perforating joint away from the opening is connected to a first pipeline, and the driving medium can flow into or out of the cavity in the perforating joint through the first pipeline.

[0011] Preferably, a spring is sleeved on the punching piston rod, one end of the spring abuts against the flange, and the other end abuts against the punching piston.

[0012] Preferably, the driving assembly includes a driving end and a hydraulic actuator module, the hydraulic actuator module includes an oil cylinder outer tube, the oil cylinder outer tube is fixed to one end of the punching module, a pull rod piston is provided in the oil cylinder outer tube, the pull rod piston divides the interior of the oil cylinder outer tube into two hydraulic chambers, and the hydraulic chamber is used to contain the driving medium; a hydraulic oil inlet circuit is opened on the pull rod piston, one end of the hydraulic oil inlet circuit is connected to the first pipeline, and the other end of the hydraulic oil inlet circuit is connected to the hydraulic chamber away from the punching module; the pull rod piston is connected to the driving end at the end away from the punching module.

[0013] Preferably, the side wall of the punching joint between the flange and the punching piston is connected to a second pipeline, and the outer tube of the oil cylinder is provided with a hydraulic return oil pipeline near one end of the punching module, one end of the hydraulic return oil pipeline is connected to the second pipeline, and the other end of the hydraulic return oil pipeline is connected to the hydraulic chamber near one end of the punching module.

[0014] Preferably, the driving end includes a driving spline-type sleeve, one end of the driving spline-type sleeve is connected to the end of the pull rod piston away from the punching module, the other end of the driving spline-type sleeve is provided with a connecting hole, the inner side wall of the connecting hole is provided with helical teeth, and a driving gear is provided in the connecting hole. The driving gear is connected to the helical teeth for transmission, and the driving gear is externally connected to a driving module, and the driving module can control the rotation of the driving gear, and when the driving gear rotates, it can drive the driving spline-type sleeve to move back and forth.

[0015] Preferably, the driving module includes a permanent magnet synchronous motor, a motor shaft of the permanent magnet synchronous motor is connected to the driving gear, and the permanent magnet synchronous motor is externally connected to a power source through an electronic control device.

[0016] Preferably, the driving module also includes a driving module outer tube, the permanent magnet synchronous motor is arranged in the driving module outer tube, and the hydraulic actuator module also includes a hydraulic actuator outer tube, and the driving spline-type sliding sleeve is movably arranged in the hydraulic actuator outer tube; one end of the hydraulic actuator outer tube is connected to the driving module outer tube, and the other end of the hydraulic actuator outer tube is connected to the outer tube of the oil cylinder.

[0017] Preferably, it further comprises a guide module, wherein the guide module is fixedly arranged at one end of the punching module away from the driving assembly.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The present invention adopts a punching module and a driving component for use. The driving component drives the punching punch of the punching module to reciprocate along the radial direction of the oil casing, and utilizes the punching punch to squeeze the side wall of the oil casing to achieve drilling. The present invention has a simple structure and is easy to operate. The oil casing will not be damaged when drilling holes in the oil casing, eliminating the safety hazards of gunpowder drilling, and solving the problems of large randomness of holes and irregular hole shapes caused by traditional drilling, which are very easy to penetrate the casing wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 Schematic diagram of the structure of the oil casing perforating device in one or some embodiments of the present invention.

[0022] In the figure: 1-power source module, 2-drive module, 201-drive module outer tube, 202-permanent magnet synchronous motor, 203-drive gear, 204-electronic control device, 3-hydraulic actuator module, 301-hydraulic actuator outer tube, 302-drive spline sleeve, 303-pull rod piston, 304-cylinder outer tube, 305-hydraulic oil inlet line, 306-hydraulic end cover, 307-hydraulic oil return line, 4-punching module, 401-punching joint, 402-punching piston, 403-connecting screw, 404-punching punch, 405-spring, 5-guide module. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] The purpose of the present invention is to provide an oil casing drilling device to solve the problems existing in the above-mentioned prior art, with low cost and the ability to reduce safety hazards.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the prior art, the main method for drilling holes in oil casing is gunpowder drilling, which is usually achieved using a perforating gun. During the operation of the perforating gun, the perforating gun is lowered into the target layer to be perforated underground via a cable or a continuous oil tubing, and the detonator is detonated via the cable or the pressure detonator connected to the continuous oil tubing is pressurized and detonated via the continuous oil tubing, thereby detonating the detonating cord and the perforating bullet in the bullet rack. The metal jet of the perforating bullet penetrates the corresponding external blind hole on the gun body and the central tube of the oil tubing and the packer, thereby connecting the oil tubing and the casing. However, drilling holes with a perforating gun has certain safety hazards and is relatively costly; moreover, the holes formed by the perforating gun are highly random and irregular in shape, and the metal jet of the perforating bullet is very likely to penetrate the casing wall. This has a great impact on subsequent construction such as fracturing, while oil and gas well operations require the formation of stable holes and ensure that the casing is not damaged when a hole is opened on the oil tubing. Therefore, in order to solve the problems encountered in gunpowder drilling, the present invention provides an oil casing drilling device, with reference to Figure 1 As shown, it includes a punching module 4, which is arranged perpendicular to the axis of the oil casing to be punched and can enter the position to be punched in the oil casing; the punching module 4 has a punching punch 404, which can reciprocate along the radial direction of the oil casing to achieve extrusion and punching of the side wall of the oil casing; and a drive assembly is used to provide power for the reciprocating movement of the punching punch 404. The present invention uses the punching module 4 and the drive assembly in combination. The drive assembly drives the punching punch 404 of the punching module 4 to reciprocate along the radial direction of the oil casing, using the punching punch 404 to squeeze the side wall of the oil casing to achieve drilling. The end of the punching punch 404 has a structure similar to a drill bit, which can perforate the side wall of the oil casing by squeezing the side wall of the oil casing. The present invention has a simple structure and is easy to operate. It will not damage the oil casing when drilling holes in it, eliminating the safety hazards of gunpowder drilling, and solving the problems of large randomness and irregular hole shape caused by traditional drilling, which are very easy to penetrate the casing wall.

[0027] In one embodiment, the punching module 4 adopts a driving principle similar to that of a hydraulic cylinder. The punching module 4 of this embodiment also includes a punching joint 401, which is provided with a cavity, and one end of the cavity is open; a punching piston 402 is movably provided in the cavity of the punching joint 401, and the punching piston 402 is in contact and sealed with the inner wall of the cavity of the punching joint 401. In order to achieve the sealing effect, a sealing ring is provided on the outer wall of the punching piston 402 in this embodiment, which is in contact and sealed with the inner wall of the punching joint 401 through the sealing ring; one end of the punching piston 402 is connected to a punch 404 by a connecting screw 403, and the punch 404 is movably provided at the open end of the punching joint 401; the driving component can pass a driving medium into the cavity of the punching joint 401 at an end away from the punch 404. The end of the punching joint 401 away from the opening is connected to a first pipeline, and a driving medium can flow into the cavity in the punching joint 401 through the first pipeline; the pressure in the cavity increases, and then the driving medium squeezes the punching piston 402 to move outward along the cavity of the punching joint 401, which can drive the punching joint 401 to move outward, thereby realizing the extrusion and punching operation of the side wall of the oil casing. After the punching is completed, the driving medium flows in the opposite direction, and the pressure in the cavity of the punching joint 401 away from the opening is reduced, thereby realizing the return of the punching piston 402 and the punching punch 404. After the return, the punching punch 404 is separated from the punched hole, and then the entire device of the present invention can be removed from the oil casing; the driving medium is not limited. In this embodiment, hydraulic oil is used. In other embodiments, gas can also be used as the driving medium.

[0028] To ensure that the punching punch 404 can retract to its original position after the punching is completed, in one embodiment, a punching piston 402 rod is integrally formed at one end of the punching piston 402. The outer diameter of the punching piston 402 rod is smaller than that of the punching piston 402. The end of the punching piston 402 rod away from the punching piston 402 is connected to the punching punch 404. A flange is fixedly provided on the inner side wall of the punching joint 401 near the open end, and the flange is in sealing contact with the punching piston 402 rod. A spring 405 is sleeved on the punching piston 402 rod, with one end of the spring 405 abutting the flange and the other end abutting the punching piston 402. Initially, under the elastic force of the spring 405, the punching piston 402 is located in the cavity of the punching joint 401 away from the opening end. At this time, the end of the punching punch 404 is located at the opening position of the punching joint 401. The device of the present invention can move in and out along the oil casing, but cannot punch holes at this time; when the punching operation is in progress, the driving medium can flow into the cavity in the punching joint 401 through the first pipeline; the driving medium squeezes the punching piston 402 to move outward along the cavity of the punching joint 401, and squeezes the spring during the movement, which can drive the punching joint 401 to move outward, thereby realizing the extrusion and punching operation of the side wall of the oil casing. After the punching is completed, the driving medium flows in the reverse direction, and the pressure of the punching joint 401 away from the opening end is reduced. At this time, under the elastic force of the spring, the punching piston 402 moves in the reverse direction, thereby realizing the return of the punching piston 402 and the punching punch 404.

[0029] In one embodiment, the driving assembly includes a driving end and a hydraulic actuator module 3, the hydraulic actuator module 3 includes an oil cylinder outer tube 304, the oil cylinder outer tube 304 is fixed to one end of the punching module 4, specifically, the oil cylinder outer tube 304 is connected to the punching joint 401 through a hydraulic end cover 306, and the hydraulic end cover 306 is threadedly connected to the oil cylinder outer tube 304 and the punching joint 401 respectively; a pull rod piston 303 is provided in the oil cylinder outer tube 304, and the pull rod piston 303 divides the interior of the oil cylinder outer tube 304 into two hydraulic chambers, and the hydraulic chamber is used to contain the driving medium; a hydraulic oil inlet is provided on the pull rod piston 303 The hydraulic oil inlet line 305 is connected to the first pipeline at one end, and the other end is connected to the hydraulic chamber away from the punching module 4. A passage is provided in the hydraulic end cover 306. After the piston rod of the pull rod piston 303 passes through the oil cylinder outer tube 304, it is sealed and connected to the passage in the hydraulic end cover 306. One end of the hydraulic oil inlet line 305 is connected to the first pipeline through this passage, so that the hydraulic oil inlet line 305 is not directly connected to the first pipeline, and the pull rod piston 303 will not be restricted by the first pipeline when it reciprocates. The pull rod piston 303 is connected to the driving end at the end away from the punching module 4. The side wall of the punching joint 401 of this embodiment is connected to the second pipeline between the flange and the punching piston 402. A hydraulic return line is provided at the end of the oil cylinder outer tube 304 near the punching module 4. One end of the hydraulic return line is connected to the second pipeline, and the other end of the hydraulic return line is connected to the hydraulic chamber near the punching module 4.

[0030] During the drilling operation, the driving end drives the rod piston 303 to move upward. At this time, the hydraulic chamber at the upper end of the rod piston 303 is pressurized, and the hydraulic oil flows along the hydraulic oil inlet 305 to the lower end of the drilling piston 402. The drilling piston 402 is squeezed out by the hydraulic oil, and drives the drilling punch 404 to extend the device and slowly push it against the oil casing wall. At the same time, the spring is slowly compressed. As the pressure increases, the oil casing wall is successfully drilled. After the drilling is completed, the drilling punch 404 can follow the drilling piston 402 to withdraw from the drilled hole and can perform the next drilling operation, so that the drilling punch 404 can be used multiple times. After drilling is completed, the driving end controls the rod piston 303 to move in the opposite direction. At this time, the hydraulic chamber at the lower end of the rod piston 303 is pressurized. The hydraulic oil in the hydraulic chamber at the lower end of the rod piston 303 enters the inner chamber of the flange and the punching piston 402 near the punch 404 through the hydraulic return line 307, that is, the upper end of the punching piston 402. The hydraulic oil at the lower end of the punching piston 402 flows along the hydraulic inlet line 305 to the hydraulic chamber at the upper end of the rod piston 303. At this time, under the combined action of the spring, the punching piston 402 moves inward and returns to its initial position. After drilling, the drilling tool can be removed to the ground.

[0031] In one embodiment, the drive end includes a drive spline sleeve 302, one end of which is connected to the end of the pull rod piston 303 away from the punching module 4. The other end of the drive spline sleeve 302 is provided with a connection hole, the inner sidewall of which is provided with helical teeth. A drive gear 203 is located within the connection hole. The drive gear 203 is in driving connection with the helical teeth. The drive gear 203 is externally connected to the drive module 2. The drive module 2 can control the rotation of the drive gear 203, and when the drive gear 203 rotates, it can drive the drive spline sleeve 302 to reciprocate. The drive module 2 includes a drive module outer tube 201 and a permanent magnet synchronous motor 202. The motor shaft of the permanent magnet synchronous motor 202 is connected to the drive gear 203. The permanent magnet synchronous motor 202 and the drive module outer tube 201 are fixed and cannot move relative to each other. The main shaft of the permanent magnet synchronous motor 202 can drive the drive gear 203 to rotate. The permanent magnet synchronous motor 202 is externally connected to a power source through an electronic control device 204. The permanent magnet synchronous motor 202 is arranged in the outer tube 201 of the driving module, and the hydraulic actuator module 3 also includes a hydraulic actuator outer tube 301. The driving spline sleeve 302 is movably arranged in the hydraulic actuator outer tube 301. The inner side of the hydraulic actuator outer tube 301 is in the form of an internal spline that cooperates with the external spline of the driving spline sleeve 302. The driving spline sleeve 302 can only move up and down in the hydraulic actuator outer tube 301 and cannot rotate; the inner side of the driving spline sleeve 302 is a helical tooth that engages with the driving gear 203. When the driving gear 203 rotates, it can drive the driving spline sleeve 302 to move up and down. The lower side of the driving spline sleeve 302 is fixedly connected to the upper side of the pull rod piston 303 by threads. When the driving spline sleeve 302 moves up and down, the pull rod piston 303 can be driven to move up and down. One end of the hydraulic actuator outer tube 301 is connected to the driving module outer tube 201, and the other end of the hydraulic actuator outer tube 301 is connected to the oil cylinder outer tube 304. The power source of the present invention can adopt a power source module 1 connected to the driving module outer tube 201. The power source module 1 is composed of high-energy battery modules connected in series and connected to the driving module 2. The equipment of the present invention can be used to drill the well using two connection modes: wire rope and cable. If the cable connection mode is adopted, the power source module 1 can be eliminated and the cable external power supply can be directly used as the power source. When the wire rope connection mode is adopted, the power source module 1 needs to be set as the power source.

[0032] When a wire rope connection method is adopted, before going down the well, assemble the tool string, and conduct a ground connection test between the wire rope, the existing rotary short section, the weight rod (selected according to the operation situation), the mechanical jar, the sealing tool and the punching device of the present invention. Complete the programming of the electronic control device 204. According to the operation procedure, the punching tool string is lowered to the target depth. After the program setting time is reached, the electronic punching command is automatically enabled downhole, and the power unit drives the pull rod piston 303 to pressurize the hydraulic chamber. As the pressure increases, the punching punch 404 moves outward and begins to punch holes in the pipe wall. As the pressure in the hydraulic chamber continues to increase, the punching punch 404 penetrates the oil pipe wall, achieving drilling of the oil pipe wall, thereby establishing a communication channel with the annular space. After the drilling is completed, the punching piston 402 is retracted, that is, moves in the opposite direction, driving the punching punch 404 to synchronously exit the hole, and then the device of the present invention can be taken out to the ground as a whole.

[0033] In the case of the cable connection method, before going down the well, assemble the tool string, and conduct a ground connection test on the cable with the rotary short section, weight rod (selected according to the operation situation), mechanical jar, sealing tool and the punching device of the present invention. According to the operation procedure, the punching tool string is lowered to the target depth, and the cable operation can control the tool and feedback data in real time. Through ground operation, the drilling command is activated downhole, and the power unit drives the pull rod piston 303 to pressurize the hydraulic chamber. As the pressure increases, the drilling punch 404 moves outward and begins to drill holes in the pipe wall. As the pressure in the hydraulic chamber continues to increase, the drilling punch 404 penetrates the oil pipe wall, achieving drilling of the oil pipe wall, thereby establishing a communication channel with the annular space. The drilling piston 402 is retracted, driving the drilling punch 404 to synchronously exit the hole, and then the device of the present invention can be taken out to the ground.

[0034] In one embodiment, in order to facilitate the entry and exit of the oil casing, a guide module 5 is designed. The end of the guide module 5 is a smooth arc-shaped protrusion structure, which is fixed to the end of the punching module 4 away from the drive assembly. The guide module 5 is the lowest part of the entire punching device and is connected to the lower end of the punching module 4. The module plays a guiding role in the process of lowering the punching device.

[0035] When the present invention is working, after the electronic control device 204 receives the drilling command, the power source module 1 provides power to the permanent magnet synchronous motor 202 or directly provides power through the cable, and the permanent magnet synchronous motor 202 starts to rotate forward, driving the drive gear 203 to rotate. Because the permanent magnet motor can be made into multi-pole and has low-speed and high-torque characteristics, the rotation of the drive gear 203 drives the drive spline-type sliding sleeve 302 to move upward, and the pull rod piston 303 moves upward together. At this time, the hydraulic cavity at the upper end of the pull rod piston 303 is pressurized, and the hydraulic oil goes along the hydraulic oil inlet 305 to the lower end of the drilling piston 402. The drilling piston 402 moves outward and drives the drilling punch 404 to extend the device and slowly push it against the oil casing wall, while slowly compressing the spring. As the pressure increases, the oil casing wall is successfully drilled. After the drilling is completed, the permanent magnet synchronous motor 202 rotates in the opposite direction, driving the drive gear 203 to rotate in the opposite direction. The rotation of the drive gear 203 drives the spline sleeve 302 to move downward, and the pull rod piston 303 moves downward together. At this time, the hydraulic chamber at the lower end of the pull rod piston 303 is pressurized, and the hydraulic oil in the hydraulic chamber at the lower end of the pull rod piston 303 flows along the hydraulic return oil line 307 to the upper end of the drilling piston 402. Under the joint action of the spring, the drilling piston 402 moves inward and returns to its initial position. After drilling, the drilling tool can be removed to the ground. The drilling modules 4 of this embodiment can be connected in series to achieve multiple holes at a time. Different drilling modules 4 can be connected to each other according to different oil casing diameters, which is quick and convenient.

[0036] The permanent magnet synchronous motor 202 is selected in the drive module 2 because this type of motor is highly efficient and energy-saving. The motor can be made into multiple stages and has low-speed, high-torque characteristics. The efficiency and power factor of the asynchronous motor are directly related to the load rate, and the power factor of the asynchronous motor is low at low load rates. The operating efficiency of the permanent magnet synchronous motor 202 can reach 0.9 and the power factor can reach 0.95 at a low load rate of 10%. The permanent magnet motor has a high efficiency within the rated load range. By utilizing the energy-saving and low-speed, high-torque characteristics of the permanent magnet synchronous motor 202, under the condition of rated power source capacity, it is ensured that the motor has sufficient torque to generate sufficient pressure in the punching module 4 to ensure the smooth completion of the punching task. The electronic control device 204 is used to realize the start and stop of the permanent magnet synchronous motor 202 and the regulation and control of the speed.

[0037] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An oil casing drilling device, characterized by: include: A punching module is arranged perpendicular to the axis of the oil casing to be punched and is capable of entering the oil casing to reach the location where the hole is to be punched. The punching module has a punching punch that can reciprocate along the radial direction of the oil casing to achieve extrusion punching of the side wall of the oil casing; The driving assembly is used to provide power for the reciprocating movement of the punching head.

2. The oil casing punching device according to claim 1, characterized in that: The punching module also includes a punching joint, which is provided with a cavity and has an opening at one end; a punching piston is movably provided in the cavity of the punching joint, and the punching piston is in contact and sealed with the inner wall of the cavity of the punching joint; one end of the punching piston is connected to the punching punch, and the punching punch is movably provided at the open end of the punching joint; the driving assembly can pass a driving medium into the cavity of the punching joint, and the driving medium can drive the punching piston to move back and forth along the cavity of the punching joint.

3. The oil casing punching device according to claim 2, characterized in that: A perforating piston rod is integrally formed at one end of the perforating piston, and the outer diameter of the perforating piston rod is smaller than the outer diameter of the perforating piston; the perforating piston rod is connected to the perforating punch at one end away from the perforating piston; a flange is fixedly provided on the inner side wall of the perforating joint close to the opening end, and the flange is in sealing contact with the perforating piston rod; the end of the perforating joint away from the opening is connected to a first pipeline, and the driving medium can flow into or out of the cavity in the perforating joint through the first pipeline.

4. The oil casing drilling device according to claim 3, characterized in that: A spring is sleeved on the punching piston rod, one end of the spring abuts against the flange, and the other end abuts against the punching piston.

5. The oil casing drilling device according to claim 3, characterized in that: The drive assembly includes a drive end and a hydraulic actuator module, the hydraulic actuator module includes an oil cylinder outer tube, the oil cylinder outer tube is fixed to one end of the punching module, a pull rod piston is provided in the oil cylinder outer tube, the pull rod piston divides the interior of the oil cylinder outer tube into two hydraulic chambers, and the hydraulic chamber is used to contain the driving medium; a hydraulic oil inlet circuit is provided on the pull rod piston, one end of the hydraulic oil inlet circuit is connected to the first pipeline, and the other end of the hydraulic oil inlet circuit is connected to the hydraulic chamber away from the punching module; the pull rod piston is connected to the drive end at the end away from the punching module.

6. The oil casing punching device according to claim 5, characterized in that: The side wall of the punching joint between the flange and the punching piston is connected to a second pipeline, and the outer tube of the oil cylinder is provided with a hydraulic return oil pipeline near one end of the punching module. One end of the hydraulic return oil pipeline is connected to the second pipeline, and the other end of the hydraulic return oil pipeline is connected to the hydraulic cavity near one end of the punching module.

7. The oil casing drilling device according to claim 5, characterized in that: The driving end includes a driving spline-type sleeve, one end of the driving spline-type sleeve is connected to the end of the pull rod piston away from the punching module, the other end of the driving spline-type sleeve is provided with a connecting hole, the inner side wall of the connecting hole is provided with helical teeth, and a driving gear is provided in the connecting hole. The driving gear is transmission-connected to the helical teeth, and the driving gear is externally connected to a driving module, and the driving module can control the rotation of the driving gear, and when the driving gear rotates, it can drive the driving spline-type sleeve to move back and forth.

8. The oil casing punching device according to claim 7, characterized in that: The driving module includes a permanent magnet synchronous motor, a motor shaft of the permanent magnet synchronous motor is connected to the driving gear, and the permanent magnet synchronous motor is externally connected to a power source through an electronic control device.

9. The oil casing drilling device according to claim 8, characterized in that: The driving module also includes a driving module outer tube, the permanent magnet synchronous motor is arranged in the driving module outer tube, and the hydraulic actuator module also includes a hydraulic actuator outer tube, and the driving spline-type sliding sleeve is movably arranged in the hydraulic actuator outer tube; one end of the hydraulic actuator outer tube is connected to the driving module outer tube, and the other end of the hydraulic actuator outer tube is connected to the outer tube of the oil cylinder.

10. The oil casing drilling device according to claim 1, characterized in that: It also includes a guide module, which is fixed to one end of the punching module away from the driving assembly.

Images