Sleeve perforating device

Abstract

The invention relates to the technical field of oil extraction, and discloses a casing pipe perforating device. The casing pipe perforating device comprises a perforating device body and a driving device, the perforating device body comprises a pipe body, a hydraulic cavity is formed in the pipe body, a first piston is slidably connected into the hydraulic cavity, one end of the hydraulic cavity is provided with a pressurizing pipeline communicated with the hydraulic cavity, and a plurality of pressurizing holes are formed in the periphery of the pipe body; a punching assembly is slidably connected into the pressurizing hole. The driving device is used for driving the first piston to slide in the hydraulic cavity. The punching mode provided by the invention is free of dangerous goods sources, so that high safety qualification is not required, time and labor are saved during operation, the safety coefficient is high, the labor intensity of workers is low, the operation cost is low, meanwhile, due to stroke limitation of the punching assembly, the punching depth is manually controllable, the punching quality is ensured to meet preset requirements, the secondary sealing quality can be ensured, and the production efficiency is improved. The shaft safety is prevented from being influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production, and particularly to a casing punching device. Background Art

[0002] Affected by the original cementing quality and later development methods such as water injection and steam injection, the cement sheath outside the casing of some oil wells is damaged, resulting in interlayer leakage, damaging the wellbore integrity, and affecting the normal production of oil wells. At the same time, in accordance with the requirements of the "Guidelines for the Disposal of Long-Term Shut-In Wells and Abandoned Wells" standard, all abandoned wells need to protect the fresh water layer during well sealing, and secondary cementing is required for the well sections with unqualified cementing quality or no cement bond outside the fresh water layer. Conventional or tubing-conveyed perforation and cement squeezing technologies are used to seal such problems. Specifically, a logging truck (including an operation room, an operation winch, etc.), a cable or tubing conveyance is used in cooperation with a perforating gun. The operation steps are as follows: understand the situation of the construction well and allocate the construction tasks for each post; assemble the perforating gun; connect the perforating gun at the wellhead and connect all the perforating gun bodies in sequence and lower them into the well; connect the detonating device after the gun body is lowered; the operation team lowers the tubing string with the gun body; the perforating team calibrates the depth and positions; adjust the tubing string and then perforate after adjustment. This kind of perforation method has problems such as high requirements for safety qualifications, high construction costs, poor timeliness, and uncontrollable perforating shell force, resulting in unsatisfactory secondary cementing quality and seriously affecting the wellbore safety. Summary of the Invention

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present invention provides a casing punching device.

[0004] The present invention provides a casing punching device, including:

[0005] A punching device body, including a tube body that can be inserted into the casing. A hydraulic cavity for accommodating a force transmission medium is formed inside the tube body. A first piston is slidably connected inside the hydraulic cavity. One end of the hydraulic cavity is provided with a pressurizing pipeline communicating with the hydraulic cavity. A plurality of pressurizing holes communicating with the pressurizing pipeline are provided on the outer periphery of the tube body. A punching assembly is slidably connected inside the pressurizing holes.

[0006] A driving device for driving the first piston to slide inside the hydraulic cavity.

[0007] Optionally, the punching assembly includes a second piston slidably disposed inside the pressurizing hole and a hole needle disposed outside the second piston.

[0008] Optionally, the diameter of the hole needle gradually increases along the direction away from the pressurizing pipeline.

[0009] Optionally, the hole needle is detachably connected to the second piston.

[0010] Optionally, the hole needle is inserted and connected to the second piston, and the hole needle is in interference fit with the second piston.

[0011] Optionally, the dimension that the hole needle extends out of the second piston is 15 - 25 mm.

[0012] Optionally, multiple pressurizing holes are arranged in a spiral pattern with respect to the axis of the pipe body.

[0013] Optionally, the deflection angle between two adjacent pressurizing holes is 45 - 60°.

[0014] Optionally, the distance between two adjacent pressurizing holes along the axis direction of the pipe body is 15 - 20 cm.

[0015] Optionally, the diameter of the pressurizing hole is larger than the diameter of the pressurizing pipeline.

[0016] Optionally, the axis of the pressurizing hole is perpendicular to the axis of the pressurizing pipeline.

[0017] Optionally, the driving device is a hydraulic loading device. The hydraulic loading device is connected to the end of the pipe body far from the pressurizing pipeline, and the push rod of the hydraulic loading device is connected to the first piston.

[0018] Optionally, a connector is provided at the end of the pipe body far from the pressurizing pipeline. The connector is detachably connected to the hydraulic loading device, and a through hole for the push rod of the hydraulic loading device to pass through is provided inside the connector.

[0019] Optionally, an annular protrusion is provided on the outer periphery of the connector. Part of the connector extends into the hydraulic cavity so that the annular protrusion supports on the end of the pipe body.

[0020] Optionally, a connection seat is provided on the side of the first piston far from the pressurizing pipeline, and the connection seat can extend into the through hole.

[0021] Optionally, an oil pipe is connected to the liquid inlet end of the hydraulic loading device, and the liquid inlet end of the oil pipe is used to be connected to the liquid outlet end of a pressure pumping truck.

[0022] Optionally, the connection end of the connector and the hydraulic loading device are connected by threads.

[0023] Optionally, a liquid injection hole and an exhaust hole communicating with the hydraulic cavity or the pressurizing pipeline are provided on the outer periphery of the pipe body, and the liquid injection hole and the exhaust hole are respectively sealed by plug heads.

[0024] Optionally, the pipe body includes a first pipe and a second pipe connected by threads. The hydraulic cavity is formed inside the first pipe, and the pressurizing pipeline is formed inside the second pipe.

[0025] Optionally, a ramp surface is provided on the outer periphery of the end of the pipe body away from the driving device.

[0026] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0027] In the casing punching device provided by the present invention, a hydraulic cavity, a pressurizing pipeline, and a pressurizing hole are sequentially communicated on the casing. When the driving device drives the first piston to move to compress the force transmission medium, the force transmission medium will push the punching assembly at the position of the pressurizing hole outward, so that the punching assembly can punch the casing. This punching method has no dangerous goods source, and thus does not require very high safety qualifications. Moreover, the operation is time-saving and labor-saving, with a high safety factor, low labor intensity and operation cost of workers. At the same time, due to the stroke limitation of the punching assembly, the punching depth can be controlled manually, ensuring that the punching quality meets the preset requirements, and further ensuring the secondary sealing quality, avoiding affecting the wellbore safety, and meeting the work requirements of cost reduction and efficiency increase and quality improvement of the operation system. Description of the Drawings

[0028] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present invention, and are used together with the specification to explain the principles of the present invention.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic structural diagram of the punching device body according to the embodiment of the present invention;

[0031] Figure 2 It is a schematic structural diagram during the use of the casing punching device according to the embodiment of the present invention.

[0032] Description of the Reference Numerals

[0033] 1. Punching device body; 11. Pipe body; 111. First pipe; 112. Second pipe; 113. Ramp surface; 12. Hydraulic cavity; 13. First piston; 131. Connecting seat; 14. Pressurizing pipeline; 15. Pressurizing hole; 16. Punching assembly; 161. Second piston; 162. Hole needle; 17. Connecting head; 171. Through hole; 172. Annular protrusion;

[0034] 2. Casing

[0035] 3. Driving device; 31. Hydraulic loading device; 32. Pressure pumping truck

[0036] 4. Oil pipe

[0037] 5. Plug Detailed implementation manner

[0038] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the solution of the present invention will be further described below. It should be noted that, without conflict, the implementation manners of the present invention and the features in the implementation manners can be combined with each other.

[0039] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the implementation manners in the specification are only a part of the implementation manners of the present invention, rather than all of the implementation manners.

[0040] As Figure 1 shown, the casing punching device provided by the implementation manner of the present invention includes a punching device body 1 and a driving device 3.

[0041] The punching device body 1 includes a tube body 11 that can be inserted into the inside of the casing 2, that is, the tube body 11 can be inserted into the inside of the casing 2 along the axial direction of the casing 2, and the tube body 11 can be in a specified position of the casing 2. A hydraulic cavity 12 for accommodating a force-transmitting medium is formed inside the tube body 11, that is, the hydraulic cavity 12 can accommodate the force-transmitting medium, and the force-transmitting medium can be hydraulic oil, etc., so as to replace the traditional perforating punching with hydraulic punching.

[0042] A first piston 13 is slidably connected inside the hydraulic cavity 12 to be able to pressurize the force-transmitting medium in the hydraulic cavity 12 by the movement of the first piston 13. One end of the hydraulic cavity 12 is provided with a pressure pipeline 14 communicated with the hydraulic cavity 12 so that the force-transmitting medium in the hydraulic cavity 12 can enter the pressure pipeline 14. A plurality of pressure holes 15 communicated with the pressure pipeline 14 are provided on the outer periphery of the tube body 11 so that the force-transmitting medium in the pressure pipeline 14 can enter the pressure holes 15. A punching assembly 16 is slidably connected in the pressure holes 15 so that the force-transmitting medium in the pressure holes 15 can act on the inner side of the punching assembly 16, and then the punching assembly 16 can be pushed so that the punching assembly 16 can extend out of the pressure holes 15 and punch a preset hole in the casing 2.

[0043] Among them, the setting method of the punching component 16 is not limited, as long as it can punch through the casing 2 under pressure. The driving device 3 is used to drive the first piston 13 to slide in the hydraulic cavity 12, thereby changing the position of the first piston 13 in the hydraulic cavity 12 to press the force transmission medium. Among them, the setting method of the driving device 3 is not limited, as long as it can provide a stable acting force on the first piston 13.

[0044] The working principle of the casing 2 punching device is as follows:

[0045] Before use, the pipe body 11 is filled with the force transmission medium. The pipe body 11 filled with the force transmission medium is lowered to the designated position of the casing 2. The driving device 3 works to drive the first piston 13 to move downward, thereby causing the first piston 13 to compress the force transmission medium, and then pushing the punching component 16 to move through the force transmission medium, so that the punching component 16 extends out of the pressure application hole 15 under the pressure of the force transmission medium. The part of the punching component 16 extending out of the pressure application hole 15 acts on the inner wall of the casing 2. Through the continuous driving of the driving device 3 for the first piston 13 to move, the pressure of the punching component 16 acting on the casing 2 gradually increases, so that the punching component 16 can punch through the casing 2, and holes are formed on the outer periphery of the casing 2 for subsequent operations.

[0046] In the casing 2 punching device provided by the present invention, the casing 2 is provided with a hydraulic cavity 12, a pressure application pipeline 14 and a pressure application hole 15 that are sequentially communicated. When the driving device 3 drives the first piston 13 to move to compress the force transmission medium, the force transmission medium will push the punching component 16 at the position of the pressure application hole 15 to move outward, so that the punching component 16 can punch the casing 2. This punching method has no dangerous goods source, and thus does not require high safety qualifications. Moreover, the operation is time-saving and labor-saving, with a high safety factor, low labor intensity and operation cost of workers. At the same time, due to the stroke limitation of the punching component 16, the punching depth is artificially controllable, ensuring that the punching quality meets the preset requirements, and thus the secondary sealing quality can be ensured, avoiding affecting the wellbore safety, and meeting the work requirements of cost reduction and efficiency increase and quality improvement of the operation system.

[0047] In some embodiments, as Figure 1 shown, the punching component 16 includes a second piston 161 slidably disposed in the pressure application hole 15 and a hole needle 162 disposed outside the second piston 161. That is, the second piston 161 is slidably engaged with the pressure application hole 15 so that the second piston 161 can move along the axial direction of the pressure application hole 15.

[0048] The hole needle 162 at this position being arranged outside the second piston 161 means that the hole needle 162 is arranged on the side of the second piston 161 facing away from the pressurizing pipeline 14. Thus, when the second piston 161 moves outward under pressure, the hole needle 162 first protrudes from the pressurizing hole 15 and acts on the inner wall of the sleeve 2, facilitating the hole needle 162 to drill a hole in the sleeve 2.

[0049] During use, the driving device 3 drives the first piston 13 to move downward, and the force - transmitting medium in the pipe body 11 is compressed to transmit the acting force to each second piston 161. The second piston 161 will move outward relative to the pressurizing hole 15 under pressure. At this time, the hole needle 162 is at the pressurizing hole 15, and the end of the hole needle 162 supports on the inner wall of the sleeve 2. After continuous pressurization of the force - transmitting medium, the hole needle 162 gradually penetrates through the sleeve 2 and forms a hole in the sleeve 2.

[0050] Further optimized, the second piston 161 and the inner wall of the pressurizing hole 15 are connected through a sealing member to ensure the sealing effect and prevent the force - transmitting medium from flowing out through the gap between the second piston 161 and the inner wall of the pressurizing hole 15, avoiding the phenomenon of leakage of the force - transmitting medium.

[0051] As a feasible implementation manner, the sealing member can be an O - ring. That is, a sealing groove can be provided on the outer periphery of the second piston 161, and the O - ring is sleeved on the sealing groove, and part of the O - ring protrudes from the sealing groove so that the part of the O - ring protruding from the sealing groove can support on the inner wall of the pressurizing hole 15 to ensure the sealing effect. Among them, there can be multiple O - rings, and correspondingly, there are also multiple sealing grooves. The multiple O - rings are arranged at intervals along the axis direction of the pressurizing hole 15 to further ensure the sealing effect.

[0052] In some implementation manners, the diameter of the hole needle 162 gradually increases along the direction away from the pressurizing pipeline 14, so that the diameter of the part of the hole needle 162 away from the pressurizing pipeline 14 is larger than the diameter of the part of the hole needle 162 close to the pressurizing pipeline 14, that is, the diameter of the end of the hole needle 162 in contact with the inner wall of the sleeve 2 is larger than the diameter of the end of the hole needle 162 away from the sleeve 2.

[0053] Under this design method, during the drilling process, the large - diameter end of the hole needle 162 first contacts the sleeve 2. Under the continuous pressurization of the force - transmitting medium, the hole needle 162 can form a hole in the sleeve 2. At this time, the diameter of the hole should be the same as or close to the maximum diameter of the hole needle 162 so that the tail of the hole needle 162 can smoothly penetrate into the hole. In addition, when the hole needle 162 detaches from the second piston 161, since the diameter of the end of the hole needle 162 penetrating into the sleeve 2 is larger and the weight is greater, the hole needle 162 will tilt downward and fall to the side of the sleeve away from the pipe body 11, and then be buried by the subsequently filled cement, avoiding affecting the internal environment of the sleeve.

[0054] The hole needle 162 of the present application is detachably connected to the second piston 161. In this design, it is convenient to disassemble and assemble the hole needle 162 and to separate the hole needle 162 from the second piston 161 so as to fall outside the sleeve 2.

[0055] Specifically, the second piston 161 and the hole needle 162 in this design are of a split design. At this time, the hole needle 162 can be used as a consumable, while the second piston 161 is always slidably arranged in the pressure hole 15, and there is no need to replace the second piston 161, reducing the component replacement cost.

[0056] In some embodiments, the hole needle 162 is inserted into the second piston 161 to increase the convenience of connection between the hole needle 162 and the second piston 161, and the hole needle 162 and the second piston 161 are in interference fit to ensure the connection effect between the hole needle 162 and the second piston 161, avoiding the hole needle 162 detaching from the second piston 161 without external force, and avoiding affecting the normal use of the drilling assembly 16.

[0057] The dimension of the hole needle 162 extending out of the second piston 161 is 15 - 25 mm. Preferably, the dimension of the hole needle 162 extending out of the second piston 161 is 20 mm. With such an extending dimension, the end of the hole needle 162 can be prevented from extending out of the outer periphery of the device during the recovery of the second piston 161. Furthermore, when the casing drilling device is lowered into the casing, the end of the hole needle 162 will not extend out of the outer periphery of the casing drilling device, and when the second piston 161 drives the hole needle 162 to move, the end of the hole needle 162 can extend out of the pipe body 11 under the action of the second piston 161 so that the hole needle 162 can drill holes in the casing.

[0058] In addition, the dimension of the hole needle 162 extending into the second piston 161 is 2 - 3 mm, and the hole needle 162 and the second piston 161 are in interference connection. In this design, the stability of the connection between the hole needle 162 and the second piston 161 can be ensured, and the hole needle 162 after drilling can be separated from the second piston 161.

[0059] In some embodiments, the plurality of pressure holes 15 are spirally arranged with respect to the axis of the pipe body 11.

[0060] The pressure holes 15 in this design cause the plurality of drilling assemblies 16 to also be spirally arranged with respect to the axis of the pipe body 11. Furthermore, the holes formed by the drilling assemblies 16 in the casing 2 are spirally arranged with respect to the axis of the casing 2, thereby avoiding affecting the structural strength of the casing 2 after drilling.

[0061] Among them, the design of the casing punching device is such that it can punch through 12 holes at a time, but the number of holes punched each time can be selected according to different construction conditions. The number of holes punched per single time can be 2, 4, 6, 8, 10, or 12, and the hole spacing at different horizontal planes can also be designed according to requirements.

[0062] The deflection angle between two adjacent pressure holes 15 is 45 - 60°, preferably, the deflection angle between two adjacent pressure holes 15 is 45°. This hole layout method has the least impact on the strength of the punched section of the casing after punching, avoids deformation of the casing under external stress, and reduces damage to the casing.

[0063] The distance between two adjacent pressure holes 15 along the axial direction of the pipe body 11 is 15 - 20 cm, preferably, the distance between two adjacent pressure holes 15 along the axial direction of the pipe body 11 is 20 cm. The pressure holes 15 with such a designed size can meet a hole density of 12 holes per meter to meet the punching requirements of the casing, while avoiding affecting the strength of the casing.

[0064] Specifically, the casing punching device adopts a through-punching method, that is, through holes are opened on the pipe body 11. There are two pressure holes 15 symmetrically arranged along the axial direction of the pipe body 11 on each horizontal plane, and the axes of the two opposite pressure holes 15 coincide. That is, 6 groups of pressure holes 15 are arranged at intervals along the axial direction of the pipe body 11, with two pressure holes 15 in each group. The pressure holes 15 can meet a hole density of 12 holes per meter also referring to the pressure holes 15 of this punching method.

[0065] In addition, the pressure holes 15 designed in this way can make the acting forces on both sides of the pipe body 11 consistent, avoid the phenomenon of device deviation, and ensure that the casing punching device is always at the center of the casing.

[0066] In some embodiments, as Figure 1 shown, the diameter of the pressure hole 15 is larger than the diameter of the pressure pipeline 14.

[0067] In this design method, the cross-sectional area of the force-transmitting medium acting on the punching component 16 is large enough to ensure that the force-transmitting medium can stably act on the punching component 16, ensure that each position of the punching component 16 is evenly stressed, and further ensure the punching effect of the punching component 16.

[0068] In some embodiments, the axis of the pressure hole 15 is perpendicular to the axis of the pressure pipeline 14. In this design method, the axis of the punching component 16 is perpendicular to the pipe body 11, so that the punching component 16 can extend out of the pressure hole 15 along the direction perpendicular to the pipe body 11, ensuring that the holes formed on the casing 2 are perpendicular to the casing 2.

[0069] It can be understood that according to different punching requirements, the axis of the pressure hole 15 can also form a certain angle with the axis of the pressure pipeline 14, so that the axis of the punching assembly 16 forms a certain angle with the axis of the pipe body 11, enabling the punching assembly 16 to form an inclined hole on the pipe body 11.

[0070] In some embodiments, the driving device 3 is a hydraulic loading device 31, and the hydraulic loading device 31 is connected to one end of the pipe body 11 far from the pressure pipeline 14. Specifically, when the pipe body 11 is inserted into the sleeve 2, the hydraulic connection device is connected to the top end of the pipe body 11. The hydraulic loading device has a push rod, and the push rod of the hydraulic loading device 31 is connected to the first piston 13, so as to be able to drive the first piston 13 to move in the hydraulic cavity 12 by the telescopic movement of the push rod.

[0071] Among them, the hydraulic loading device 31 is connected to the pipe body 11. After connection, it is necessary to make the push rod of the hydraulic loading device 31 able to be connected to the first piston 13, so that the push rod can drive the first piston 13 to move along the axis direction of the hydraulic cavity 12, facilitating the downward pressure and retraction of the first piston 13.

[0072] There is a central rod structure in the hydraulic loading device 31, which is used for the conduction after the force increase of each stage of hydraulic cylinder. Instead of the central rod, a push rod is used. One end of the push rod is connected to the last stage of hydraulic cylinder in the hydraulic loading device through a thread, and the other end of the push rod is connected to the first piston 13 through a thread.

[0073] Among them, the hydraulic loading device 31 is a conventional technology in this field. Therefore, its structure and working principle are not described in detail here.

[0074] In some embodiments, a connection head 17 is provided at one end of the pipe body 11 far from the pressure pipeline 14, so as to Figure 1 Taking the shown direction as an example, a connection head 17 is provided at the left end of the pipe body 11. The connection head 17 is detachably connected to the hydraulic loading device 31 to increase the convenience of disassembly and assembly between the hydraulic loading device 31 and the connection head 17. A through hole 171 through which the push rod of the hydraulic loading device 31 can pass is provided inside the connection head 17, so that after the hydraulic loading device 31 is connected to the connection head 17, the push rod can pass through the through hole 171 and be connected to the first piston 13.

[0075] Among them, the connection head 17 and the hydraulic loading device 31 can be connected by bolts or other means. In this design, by providing the connection head 17, the convenience of connection between the hydraulic loading device 31 and the pipe body 11 can be increased.

[0076] As Figure 1 shown, an annular protrusion 172 is provided on the outer periphery of the connection head 17, and a part of the connection head 17 extends into the hydraulic cavity 12 so that the annular protrusion 172 supports at the end of the pipe body 11.

[0077] Specifically, the connector 17 adopts a cylindrical structure, and an annular protrusion 172 is provided on the outer periphery of the connector 17, so that both ends of the connector 17 extend out of the annular protrusion 172, taking Figure 1 the direction shown as an example. The right end of the connector 17 extends into the hydraulic cavity 12 to realize the connection between the connector 17 and the pipe body 11. The left end of the connector 17 will extend out of the pipe body 11, so that one end of the connector 17 extending out of the pipe body 11 is connected to the hydraulic loading device 31. The setting method of the annular protrusion 172 can position the distance that the connector 17 extends out of the pipe body 11, which is convenient for the connection between the extending end of the connector 17 and the hydraulic loading device 31. At the same time, it can position the distance that the connector 17 is inserted into the pipe body 11.

[0078] Further optimized, one end of the connector 17 extending into the pipe body 11 is connected to the inner wall of the pipe body 11 through a seal to ensure the sealing effect and prevent the transmission medium from flowing out through the gap between the connector 17 and the inner wall of the pipe body 11, avoiding the phenomenon of transmission medium leakage.

[0079] As a feasible implementation manner, the seal can be an O-ring. That is, a seal groove can be provided on the outer periphery of the connector 17, and the O-ring is sleeved on the seal groove, and part of the O-ring extends out of the seal groove, so that the part of the O-ring extending out of the seal groove can support on the inner wall of the hydraulic cavity 12 to ensure the sealing effect. Among them, there can be multiple O-rings. Correspondingly, there are also multiple seal grooves. The multiple O-rings are arranged at intervals along the axis direction of the hydraulic cavity 12 to further ensure the sealing effect.

[0080] A connection seat 131 is provided on the side of the first piston 13 away from the pressure pipeline 14. The connection seat 131 can extend into the through hole 171, and the connection seat 131 is used to connect with the push rod of the hydraulic loading device 31.

[0081] Specifically, when the connection seat 131 completely extends into the through hole 171, the end face of the first piston 13 contacts the end face of the connector 17, so as to position the positions of the first piston 13 and the connection seat 131, which is convenient for the connection between the push rod of the hydraulic loading device 31 and the connection seat 131 of the first piston 13.

[0082] As a feasible implementation manner, the connection seat 131 and the push rod of the hydraulic loading device 31 are fixed by means of threaded connection to increase the convenience of disassembly and assembly.

[0083] Further optimized, one end of the connection seat 131 extending into the connector 17 is connected to the inner wall of the connector 17 through a seal to ensure the sealing effect and prevent the transmission medium from flowing out through the gap between the connection seat 131 and the inner wall of the connector 17, avoiding the phenomenon of transmission medium leakage.

[0084] As a feasible implementation, the seal may be a sealing ring. That is, a sealing groove may be provided on the outer periphery of the connecting seat 131, the sealing ring is sleeved on the sealing groove, and a part of the sealing ring extends out of the sealing groove, so that the part of the sealing ring extending out of the sealing groove can support on the inner wall of the connecting head 17 to ensure the sealing effect. Among them, there may be multiple sealing rings, correspondingly, there are also multiple sealing grooves, and the multiple sealing rings are arranged at intervals along the axial direction of the connecting seat 131 to further ensure the sealing effect.

[0085] Further optimized, the first piston 13 is connected to the inner wall of the hydraulic cavity 12 of the pipe body 11 through a seal to ensure the sealing effect, prevent the transmission medium from flowing out through the gap between the first piston 13 and the inner wall of the pipe body 11, and avoid the phenomenon of transmission medium leakage.

[0086] As a feasible implementation, the seal may be a sealing ring. That is, a sealing groove may be provided on the outer periphery of the first piston 13, the sealing ring is sleeved on the sealing groove, and a part of the sealing ring extends out of the sealing groove, so that the part of the sealing ring extending out of the sealing groove can support on the inner wall of the hydraulic cavity 12 to ensure the sealing effect. Among them, there may be multiple sealing rings, correspondingly, there are also multiple sealing grooves, and the multiple sealing rings are arranged at intervals along the axial direction of the hydraulic cavity 12 to further ensure the sealing effect.

[0087] As Figure 2 shown, the liquid inlet end of the hydraulic loading device 31 is connected with an oil pipe 4, and the liquid inlet end of the oil pipe 4 is used to be connected with the liquid outlet end of the pressure pumping truck 32. In this design, the pressure pumping truck 32 transmits the pressure through the oil pipe 4 to the hydraulic loading device 31, and then the pressure can be transmitted to the drilling device body 1 through the hydraulic loading device 31, so that the pressure is multiplied. Then, through the hydraulic transmission in the drilling device body 1 (the first piston 13 pushes the transmission medium), the hole needle 162 can extend out of the pipe body 11 to act on the casing 2. When the pressure pumping truck 32 provides a certain pressure, the hole needle 162 penetrates through the sky switch, and then a hole can be formed on the casing 2. In this design, it can ensure that the hydraulic force acting on the second piston 161 is stable and large enough, so that the drilling depth of the hole needle 162 is sufficient to meet the drilling requirements of the casing 2.

[0088] The pressure pumping truck 32 is a special vehicle in the oil field. By cooperating with the water tanker, the liquid released from the water tanker is pressurized by the on-vehicle pump and pumped into the oil pipe through the pipeline, and then conducted to the downhole hydraulic loading device 31 through the oil pipe. The hydraulic loading device 31 starts to work through the pressure conducted in the oil pipe, and outputs to the casing drilling device after being pressurized by multiple hydraulic cylinders. Among them, the pressure pumping truck 32 is a conventional vehicle in the oil field, and it is a conventional design for those skilled in the art. Therefore, its structure and working principle are not described in detail here.

[0089] In some embodiments, the connecting end of the connector 17 is threadedly connected to the hydraulic loading device 31. The threaded connection can increase the convenience of disassembly and assembly, and at the same time ensure the firmness of the connection.

[0090] The outer periphery of the pipe body 11 of the present application is provided with liquid injection holes and exhaust holes communicating with the hydraulic cavity 12 or the pressurizing pipeline 14, and the liquid injection holes and the exhaust holes are respectively sealed by plugs 5.

[0091] In some embodiments, the outer periphery of the pipe body 11 is provided with liquid injection holes and exhaust holes communicating with the hydraulic cavity 12, and the liquid injection holes and the exhaust holes are respectively sealed by plugs 5. In this design, when injecting the force transmission medium into the pipe body 11, the liquid injection hole is opened, and the force transmission medium flows in through the hydraulic cavity 12. At this time, the gas in the pipe body 11 will be discharged through the exhaust hole, avoiding affecting the injection of the force transmission medium. At the same time, the force transmission medium in the hydraulic cavity 12 will flow to the pressurizing pipeline 14 to fill the entire pipe body 11. After the liquid injection is completed, the liquid injection hole and the exhaust hole are respectively sealed by the two plugs 5.

[0092] In other embodiments, the outer periphery of the pipe body 11 is provided with liquid injection holes and exhaust holes communicating with the pressurizing pipeline 14, and the liquid injection holes and the exhaust holes are respectively sealed by plugs 5. In this design, when injecting the force transmission medium into the pipe body 11, the liquid injection hole is opened, and the force transmission medium flows in through the pressurizing pipeline 14. At this time, the gas in the pipe body 11 will be discharged through the exhaust hole, avoiding affecting the injection of the force transmission medium. At the same time, the force transmission medium in the pressurizing pipeline 14 will flow to the hydraulic cavity 12 to fill the entire pipe body 11. After the liquid injection is completed, the liquid injection hole and the exhaust hole are respectively sealed by the two plugs 5.

[0093] In other embodiments, the outer periphery of the pipe body 11 is provided with a liquid injection hole communicating with the hydraulic cavity 12 and an exhaust hole communicating with the pressurizing pipeline 14, and the liquid injection hole and the exhaust hole are respectively sealed by plugs 5. In this design, when injecting the force transmission medium into the pipe body 11, the liquid injection hole is opened, and the force transmission medium flows in through the hydraulic cavity 12. At this time, the gas in the pipe body 11 will be discharged through the exhaust hole, avoiding affecting the injection of the force transmission medium. At the same time, the force transmission medium in the hydraulic cavity 12 will flow to the pressurizing pipeline 14 to fill the entire pipe body 11. After the liquid injection is completed, the liquid injection hole and the exhaust hole are respectively sealed by the two plugs 5.

[0094] In some other embodiments, the outer periphery of the pipe body 11 is provided with liquid injection holes communicating with the pressurized pipeline 14 and exhaust holes communicating with the hydraulic cavity 12, and the liquid injection holes and the exhaust holes are respectively sealed by plugs 5. In this design, when injecting the force transmission medium into the pipe body 11, the liquid injection holes are opened, and the force transmission medium flows in through the pressurized pipeline 14. At this time, the gas in the pipe body 11 will be discharged through the exhaust holes, avoiding affecting the injection of the force transmission medium. At the same time, the force transmission medium in the pressurized pipeline 14 will flow into the hydraulic cavity 12 to fill the entire pipe body 11. After the liquid injection is completed, the liquid injection holes and the exhaust holes are respectively sealed by the two plugs 5.

[0095] It can be seen that the setting method of the liquid injection holes and the exhaust holes in this application is not limited and can be selected according to actual needs, as long as the injection requirements of the force transmission medium in the pipe body 11 are met.

[0096] As Figure 1 shown, the pipe body 11 includes a first pipe 111 and a second pipe 112 connected by threads. The hydraulic cavity 12 is formed inside the first pipe 111, and the pressurized pipeline 14 is formed inside the second pipe 112. In this design, the pipe body 11 adopts a split design, which is convenient for the formation of the pressurized pipeline 14 and can facilitate the processing of the pipe body 11. In addition, the threaded connection method can increase the convenience of disassembly and assembly between the first pipe 111 and the second pipe 112.

[0097] Specifically, taking the direction shown in Figure 1 as an example, the left end of the first pipe 111 is connected to the connector 17. The inner wall of the right end of the first pipe 111 is provided with internal threads, and the outer periphery of the left end of the second pipe 112 is provided with external threads. The internal threads and the external threads are matched, so that the second pipe 112 can be screwed onto the outer periphery of the first pipe 111.

[0098] Further optimized, the first pipe 111 and the second pipe 112 are connected by a sealing member to ensure the sealing effect and prevent the force transmission medium from flowing out through the gap between the joints of the first pipe 111 and the second pipe 112, avoiding the phenomenon of force transmission medium leakage.

[0099] As a feasible embodiment, the sealing member can be an O-ring. That is, a sealing groove can be provided on the outer periphery of the second pipe 112, and the O-ring is sleeved on the sealing groove, and part of the O-ring extends out of the sealing groove, so that the part of the O-ring extending out of the sealing groove can support on the inner wall of the first pipe 111 to ensure the sealing effect. Among them, there can be multiple O-rings, and correspondingly, there are also multiple sealing grooves. The multiple O-rings are arranged at intervals along the axis direction of the second pipe 112 to further ensure the sealing effect.

[0100] As Figure 1As shown, a ramp surface 113 is provided on the outer periphery of the end of the pipe body 11 away from the driving device 3. By providing the ramp surface 113 at the insertion end of the pipe body 11, it plays a guiding role for the pipe body 11 to be inserted into the sleeve 2. And when the end of the pipe body 11 contacts the inner wall of the sleeve 2, the ramp surface 113 can avoid hard contact between the end of the pipe body 11 and the inner wall of the sleeve 2, and can correct the insertion angle of the pipe body 11 through the ramp surface 113, so that the pipe body 11 can extend to the specified position of the sleeve 2.

[0101] The operation steps of the casing 2 drilling device of the present invention are as follows:

[0102] Step S1, on the ground, connect the drilling device body 1 to the hydraulic loading device 31. Among them, the connection method between the drilling device body 1 and the hydraulic loading device 31 is described above.

[0103] Step S2, connect the oil pipe 4 to one end of the hydraulic loading device 31 away from the drilling device body 1, calculate the data of the casing 2, and slowly lower the drilling device body 1 and the hydraulic loading device 31 into the well through the traction of the oil pipe 4, so that the drilling device body 1 is in a suitable position of the casing 2.

[0104] Specifically, the data here includes the size, wall thickness, steel grade and drilling depth of the casing. The above data can be determined by consulting the original data and cooperating with the construction design before construction. The main data to be calculated is the drilling depth. According to the construction design, avoid the position of the casing coupling. After determining the drilling depth, determine the drilling position of the downhole tool by measuring the length of the oil pipe and the downhole tool.

[0105] Step S3, connect the pressure pump truck 32 to apply pressure. The oil pipe 4 is pressurized at 5 Mpa to observe the pressure change. If the pressure suddenly rises, it means that the hole needle 162 of the drilling device body 1 contacts the inner wall of the casing 2.

[0106] Step S4, slowly increase the pressure and observe the pressure change. When the hole needle 162 penetrates the casing 2, the pressure will fluctuate. At this time, stop pressurizing, indicating that the casing 2 has been penetrated.

[0107] Step S5, lift the oil pipe 4 tool, and the construction of the casing 2 drilling operation is completed. The second piston 161 can be knocked back to its original position by an external force.

[0108] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0109] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments described herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A casing punching device, characterized in that, Comprising: The punching device body (1) includes a tube body (11) that can be inserted into the inside of the sleeve (2). A hydraulic cavity (12) for accommodating a force-transmitting medium is formed inside the tube body (11). A first piston (13) is slidably connected inside the hydraulic cavity (12). One end of the hydraulic cavity (12) is provided with a pressurizing pipe (14) communicating with the hydraulic cavity (12). A plurality of pressurizing holes (15) communicating with the pressurizing pipe (14) are provided on the outer periphery of the tube body (11). A punching assembly (16) is slidably connected inside the pressurizing holes (15). The driving device (3) is used to drive the first piston (13) to slide inside the hydraulic cavity (12).

2. The casing punching device according to claim 1, wherein The punching assembly (16) includes a second piston (161) slidably arranged inside the pressurizing hole (15) and a hole needle (162) arranged outside the second piston (161).

3. The casing punching device according to claim 2, wherein The diameter of the hole needle (162) gradually increases along the direction away from the pressurizing pipe (14).

4. The casing drilling device according to claim 2, wherein, The hole needle (162) is detachably connected to the second piston (161).

5. The casing punching device according to claim 4, wherein The hole needle (162) is inserted into the second piston (161) in an interference fit manner.

6. The casing punching device according to claim 2, wherein, The dimension that the hole needle (162) extends out of the second piston (161) is 15 - 25 mm.

7. The casing punching device according to claim 1, characterized in that, The plurality of pressurizing holes (15) are arranged in a spiral pattern with respect to the axis of the tube body (11).

8. The casing punching device according to claim 7, characterized in that, The deflection angle between two adjacent pressurizing holes (15) is 45 - 60°.

9. The casing punching device according to claim 7, wherein, The distance between two adjacent pressurizing holes (15) along the axis direction of the tube body (11) is 15 - 20 cm.

10. The casing punching device according to claim 1, characterized in that, The diameter of the pressurizing hole (15) is larger than the diameter of the pressurizing pipe (14).

11. The casing punching device according to claim 1, characterized in that, The axis of the pressurizing hole (15) is perpendicular to the axis of the pressurizing pipe (14).

12. The casing punching device according to claim 1, characterized in that, The driving device (3) is a hydraulic loading device (31). The hydraulic loading device (31) is connected to the end of the tube body (11) away from the pressurizing pipe (14). The push rod of the hydraulic loading device (31) is connected to the first piston (13).

13. The casing punching device according to claim 12, wherein A connector (17) is provided at the end of the tube body (11) away from the pressurizing pipe (14). The connector (17) is detachably connected to the hydraulic loading device (31). A through hole (171) for the push rod of the hydraulic loading device (31) to pass through is provided inside the connector (17).

14. The casing punching device according to claim 13, wherein, An annular protrusion (172) is provided on the outer periphery of the connector (17). Part of the connector (17) extends into the hydraulic cavity (12) so that the annular protrusion (172) supports at the end of the tube body (11).

15. The casing punching device according to claim 13, characterized in that, A connection seat (131) is provided on the side of the first piston (13) away from the pressurizing pipe (14). The connection seat (131) can extend into the through hole (171).

16. The casing punching device according to claim 12, characterized in that, The liquid inlet end of the hydraulic loading device (31) is connected to an oil pipe (4). The liquid inlet end of the oil pipe (4) is used to be connected to the liquid outlet end of a pressure pump truck (32).

17. The casing punching device according to claim 13, characterized in that, The connector (17) is threadedly connected to the connection end of the hydraulic loading device (31).

18. The casing drilling device according to claim 1, characterized in that Liquid injection holes and exhaust holes communicating with the hydraulic cavity (12) or the pressurization pipeline (14) are provided on the outer periphery of the pipe body (11), and the liquid injection holes and the exhaust holes are respectively sealed by plugs (5).

19. The casing punching device according to claim 1, characterized in that, The pipe body (11) includes a first pipe (111) and a second pipe (112) that are threadedly connected. The hydraulic cavity (12) is formed inside the first pipe (111), and the pressurization pipeline (14) is formed inside the second pipe (112).

20. The casing punching device according to claim 1, characterized in that, A ramp surface (113) is provided on the outer periphery of the end of the pipe body (11) away from the driving device (3).

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