Downhole remotely controlled machining device and downhole machining system

Abstract

The application relates to a downhole remote machining device and a downhole machining system. The downhole remote machining device comprises a pipe body, a fluid adapter, a flexible pipe and an expander. The expander comprises a guide section and an outer expansion section. The guide section corresponds to the flexible pipe. The expander is in sliding connection with the pipe body. One side of the expander is located at a pressure linkage port. The pressure of a second cavity is increased to push the expander to slide on the pipe body through the pressure linkage port. An avoiding port is arranged on the pipe body and corresponds to a machining joint. When the fluid adapter inputs high-pressure fluid into the second cavity, the expander slides to the connecting end direction, and the outer expansion section extrudes the end of the flexible pipe to extend out of the avoiding port. Compared with the prior art, the machining joint of the device can extend out of the machining device to be close to the downhole rock stratum, and the device has the advantages of high machining stability.

Description

Technical Field

[0001] This invention relates to the field of downhole processing technology, and in particular to a remotely controlled downhole processing device and a downhole processing system. Background Technology

[0002] Hydraulic fracturing is a commonly used technique for enhancing oil and gas reservoir production. Essentially, it involves pressurizing fluid to a level greater than the fracturing pressure of the target formation and injecting it into the formation at a rate greater than the formation filtration rate to create fractures, increase formation permeability, and thus achieve the goal of increasing production.

[0003] Brittle unconventional reservoirs (shale oil and gas) require fracturing to create complex fracture networks as far from the wellhead as possible to achieve effective production. Due to the well-developed bedding in shale reservoirs, perforation orientation is crucial to fracturing effectiveness. Since the entire operation is a downhole operation, the equipment needs to be installed at the end of the coiled tubing. As the well casing is gradually lowered, the perforator in the equipment cannot extend outwards during perforation, preventing it from getting close to the downhole rock formation. This results in inconsistent perforation performance. Current technologies struggle to achieve well-positioned perforation, and the processing stability needs improvement. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a downhole remote-controlled processing device and a downhole processing system. The processing joint of the processing device can extend outwards and get close to the downhole rock formation, which has the advantage of high processing stability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A downhole remote-controlled processing device, comprising:

[0007] The tube body has a lowering end at one end and a connecting end at the other end, which is used to connect to the continuous tubing. The connecting end is provided with a first cavity, which is connected to the continuous tubing. The lowering end is provided with a second cavity, which has a pressure linkage port.

[0008] A fluid adapter is disposed inside the tube body, the input port of the fluid adapter is connected to the first cavity, and the first branch port of the fluid adapter is connected to the second cavity;

[0009] A flexible tube, disposed inside the tube body, one end of which is connected to the second branch port of the fluid adapter, and the other end for connecting to a processing connector; and

[0010] An expander is also disposed inside the tube body, and the expander includes a guide section and an outer expansion section, the guide section corresponding to the flexible tube; the expander is slidably connected to the tube body, one side of the expander is located at the pressure linkage port, and the increase in pressure in the second cavity will push the expander to slide on the tube body through the pressure linkage port;

[0011] The tube body is provided with a clearance opening, which is corresponding to the processing joint. When the fluid adapter inputs high-pressure fluid into the second cavity, the expander slides towards the connection end, and the outer expansion section squeezes the end of the flexible tube out of the clearance opening.

[0012] In one embodiment, the downhole remote processing device further includes a shaft;

[0013] The shaft is disposed inside the tube, and the flexible tube is mounted and fixed on the shaft.

[0014] In one embodiment, the shaft is rotatably connected to the tube, and a linkage structure is provided at the end of the shaft. When the expander moves to squeeze the linkage structure, the expander rotates the shaft through the linkage structure.

[0015] In one embodiment, the linkage structure includes linkage teeth and pressing teeth;

[0016] The compression teeth are disposed at the end of the expander;

[0017] The linkage tooth is disposed at the end of the shaft, and the linkage tooth is provided with an inclined surface;

[0018] The extrusion teeth are correspondingly arranged with the linkage teeth. When the extrusion teeth extrude the inclined surface, the pressure of the extrusion teeth is linked to the rotation of the shaft under the guidance of the inclined surface.

[0019] In one embodiment, the expander is an axisymmetric component, and at least two flexible tubes are provided, which are spaced apart circumferentially along the expander;

[0020] The number and position of the second diversion port and the avoidance port are respectively set to correspond to the flexible pipe.

[0021] In one embodiment, the guide section of the expander is a cylindrical surface, and the flexible tube is in contact with the guide section; the outer expansion section is a horn-shaped outer expansion cone surface, and the outer expansion section is smoothly connected to the guide section.

[0022] In one embodiment, the processing joint includes a perforating nozzle.

[0023] In one embodiment, the processing joint includes a laser nozzle.

[0024] In one embodiment, the laser nozzle is connected to a power supply line, which is electrically connected to an external power supply device via the flexible tube, the first cavity, and the continuous oil pipe.

[0025] The present invention also provides a downhole processing system, including the downhole remote control processing device described in the above-described scheme.

[0026] The present invention has the following advantages due to the adoption of the above technical solutions:

[0027] During normal operation, the entire device is connected to the coiled tubing via the connecting end. The device is lowered to the required processing depth through the coiled tubing, aligning the clearance port with the rock formation requiring perforation. High-pressure fluid is then pumped into the device through the coiled tubing. The fluid adapter is connected to the first branch port, allowing the high-pressure fluid to flow into the second cavity. As the high-pressure fluid enters the second cavity, the pressure increases, pushing the expander towards the connecting end. The outward-expanding section contacts the end of the flexible tube, finally squeezing the end of the flexible tube out of the clearance port. At this point, the processing joint is close to the rock formation requiring perforation, completing the device's preparation for perforation. The fluid adapter is then connected to the second branch port, and the high-pressure fluid perforates the rock formation through the perforation nozzle, forcing continuous fracturing of the formation. Compared to existing technologies, this device's processing joint can extend outwards, bringing the processing device close to the downhole rock formation, resulting in higher processing stability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the specific structure of the downhole remote control processing device in one embodiment of the present invention;

[0029] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0030] Figure 3 This is a schematic diagram of the linkage structure in one embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the specific structure of the linkage gear in one embodiment of the present invention;

[0032] The markings in the diagram are as follows:

[0033] 1. Pipe body; 11. Lowering end; 12. Connecting end; 13. First cavity; 14. Second cavity; 141. Pressure linkage port; 15. Clearance port;

[0034] 2. Fluid adapter;

[0035] 3. Flexible tube; 31. Processed joint;

[0036] 4. Expander; 41. Guide section; 42. Outer expansion section;

[0037] 5. Shaft;

[0038] 6. Linkage structure; 61. Linkage teeth; 611. Inclined surface; 62. Extrusion teeth. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0040] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," "third," "fourth," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0041] In existing downhole operations, due to the development of shale reservoirs, the perforation orientation is crucial to the fracturing effect. Because the entire operation is downhole, existing technologies struggle to achieve precise downhole perforation positioning, thus hindering processing stability. To address these issues, this invention provides a downhole remote-controlled processing device with an adjustable, telescopic processing joint, offering high processing stability. The specific solution is as follows.

[0042] The technical solution of the present invention will be described in detail below with reference to specific examples.

[0043] Reference Figure 1 as well as Figure 2 As shown, the downhole remote control processing device involved in this invention includes a pipe body 1, a fluid adapter 2, a flexible pipe 3, and an expander 4.

[0044] One end of the tube body 1 is the lowering end 11, and the other end is the connecting end 12, which is used to connect to the coiled tubing. The connecting end 12 has a first cavity 13 inside, which is connected to the coiled tubing. The lowering end 11 has a second cavity 14 inside, and the second cavity 14 has a pressure linkage port 141.

[0045] The fluid adapter 2 is located inside the tube body 1. The input interface of the fluid adapter 2 is connected to the first cavity 13, and the first branch port of the fluid adapter 2 is connected to the second cavity 14.

[0046] The flexible tube 3 is installed inside the tube body 1. One end of the flexible tube 3 is connected to the second branch port of the fluid adapter 2, and the other end is used to connect to the processing connector 31.

[0047] The expander 4 is also disposed inside the tube body 1, and the expander 4 includes a guide section 41 and an outer expansion section 42, the guide section 41 corresponding to the flexible tube 3. The expander 4 is slidably connected to the tube body 1, and one side of the expander 4 is located at the pressure linkage port 141. The increase in pressure in the second cavity 14 will push the expander 4 to slide on the tube body 1 through the pressure linkage port 141.

[0048] The tube body 1 has an opening 15, which is corresponding to the processing joint 31. When the fluid adapter 2 inputs high-pressure fluid into the second cavity 14, the expander 4 slides towards the connection end 12, and the outer expansion section 42 squeezes the end of the flexible tube 3 to extend out of the opening 15.

[0049] In one embodiment, the entire device is used for downhole reservoir perforation operations, wherein the processing joint 31 is a perforation nozzle. For example, during normal use, the entire device is connected to the coiled tubing via the connecting end 12. The connection method can be bolted flange fixation or threaded connection fixation; the specific fixing method can be preset according to actual conditions. After connection, the entire device is lowered to the required processing depth via the coiled tubing, aligning the clearance port 15 with the rock formation requiring perforation. High-pressure fluid is then pumped into the device via the coiled tubing, and the fluid adapter 2 is connected to the first branch port, allowing the high-pressure fluid to enter the second cavity 14. As the high-pressure fluid enters the second cavity 14, the pressure inside the second cavity 14 increases, pushing the expander 4 towards the connecting end 12. The outward expansion section 42 contacts the end of the flexible tube 3, finally squeezing the end of the flexible tube 3 out of the clearance port 15. At this point, the processing joint 31 is close to the rock formation that needs to be perforated, and the entire device completes the preparation before perforation. Then, the fluid adapter 2 is connected to the second diversion port, and the high-pressure fluid is perforated through the perforation nozzle to force the formation to fracture continuously. Compared with the existing technology, the processing joint 31 of this device can extend outward to be close to the rock formation in the well, which has the advantage of high processing stability.

[0050] In one embodiment, the mounting structure inside the tube body 1 is further refined, and the processing device also includes a shaft 5, which is disposed inside the tube body 1, and the flexible tube 3 is mounted and fixed on the shaft 5.

[0051] The expander 4 is an axisymmetric component. To improve overall perforation efficiency, at least two flexible tubes 3 are provided, spaced along the expander 4. The number and position of the second diversion port and the clearance port 15 correspond to the flexible tubes 3.

[0052] It should be noted that the number and position of the flexible tubes 3 are related to the rock stratum processing scheme. When designing the flexible tubes 3, it is necessary to match the positioning position in the processing scheme. In this embodiment, two flexible tubes 3 are provided.

[0053] In one embodiment, the overall structure of the expander 4 is further refined. The guide section 41 of the expander 4 is a cylindrical surface, and the flexible tube 3 is fitted with the guide section 41. The outward expansion section 42 is a trumpet-shaped outward expansion cone surface, and the outward expansion section 42 is smoothly connected to the guide section 41. Because the flexible tube 3 has the property of elastic deformation, when the expander 4 slides towards the connection end 12 under the action of fluid pressure, the expander 4 will push the flexible tube 3 to expand along the outer surface of the expander 4. As the expander 4 continues to be pushed, one end of the flexible tube 3 will gradually be suspended outward from the axis under the guidance of the outward expansion section 42, and finally extend outward through the avoidance port 15, thus achieving the effect of outward expansion.

[0054] It should be noted that by adjusting the expansion angle of the outer expansion section 42, the extension angle of the flexible tube 3 can be controlled. In actual operation, the operator can select an expander 4 with an appropriate expansion angle according to the requirements of the processing plan.

[0055] In existing downhole operations, in order to maintain downhole equipment, it is necessary to cut and process deformed or damaged casing. In one embodiment, some connecting parts of this processing device are further expanded and refined.

[0056] Reference Figure 3 as well as Figure 4 As shown, in this embodiment, the processing device is used as a whole for maintenance work on downhole reservoir pipelines, wherein the processing joint 31 is a perforation nozzle.

[0057] In this embodiment, the shaft 5 is rotatably connected to the tube 1, and the end of the shaft 5 is provided with a linkage structure 6. When the expander 4 moves to the compression linkage structure 6, the expander 4 rotates the shaft 5 through the linkage structure 6.

[0058] Further refining the details, the linkage structure 6 includes a linkage tooth 61 and a pressing tooth 62. The pressing tooth 62 is located at the end of the expander 4, and the linkage tooth 61 is located at the end of the shaft 5. The linkage tooth 61 is provided with an inclined surface 611. In this embodiment, the pressing tooth 62 and the linkage tooth 61 are correspondingly arranged. When the pressing tooth 62 presses the inclined surface 611, the pressure of the pressing tooth 62 is guided by the inclined surface 611 to rotate the shaft 5.

[0059] It should be noted that in this embodiment, multiple flexible tubes 3 are provided, and the flexible tubes 3 are evenly distributed along the circumference of the expander 4. There is a first arc between adjacent flexible tubes 3. When the extrusion teeth 62 extrude the inclined surface 611, the linkage shaft 5 rotates by one arc. This arc is the second arc. In order to enable the perforation nozzle to surround the cutting pipe, the second arc is set to be greater than the first arc. Therefore, in the early design, the designers need to match the flexible tubes 3 and the inclined surface 611 of the linkage teeth 61 according to the maintenance pipe. In addition, in order to avoid the linkage structure 6 interfering with the extension of the flexible tubes 3, the contact sequence of the linkage structure 6 is located after the contact between the flexible tubes 3 and the outer expansion section 42. Therefore, during the movement of the expander 4, the flexible tubes 3 are first extruded out of the avoidance opening 15, and then the extrusion teeth 62 contact the linkage teeth 61.

[0060] For example, in this embodiment, when the device is in normal use, the entire device is lowered to the required processing depth through a continuous oil pipe, so that the clearance port 15 corresponds to the pipe that needs to be cut and repaired. Then, high-pressure fluid is pumped into the device through the continuous oil pipe, and the fluid adapter 2 is operated to connect the first branch port and the second branch port. The high-pressure fluid is introduced into the second cavity 14 and the flexible pipe 3 through the fluid adapter 2. As the high-pressure fluid enters the second cavity 14, the pressure inside the second cavity 14 increases. The fluid will push the expander 4 towards the connection end 12, and the outward expansion section 42 will contact the end of the flexible tube 3. Finally, the end of the flexible tube 3 is squeezed out of the relief opening 15. At this time, the processing joint 31 is close to the pipe that needs to be jet-cut. The processing joint 31 performs cutting operations on the pipe. As the expander 4 continues to move, the extrusion teeth 62 contact the linkage teeth 61. The extrusion teeth 62 extrudes the inclined surface 611. Under the guidance of the inclined surface 611, the pressure of the extrusion teeth 62 rotates the linkage shaft 5. The shaft 5 synchronously drives the flexible tube 3 to rotate, and finally achieves a ring cut on the pipe.

[0061] In this embodiment, the processing joint 31 can also be a laser nozzle. When using the laser nozzle, the laser nozzle is connected to a power supply line, and the power supply line is electrically connected to an external power supply device via the flexible tube 3, the first cavity 13, and the continuous oil pipe.

[0062] The present invention also provides a downhole processing system, characterized in that it includes the downhole remote-controlled processing device mentioned in the above-mentioned scheme.

[0063] Compared with existing technologies, the processing joint 31 of the processing device can extend outward and get close to the rock formation in the well, which has the advantage of higher processing stability.

[0064] In one embodiment, in order to facilitate the lowering of the entire device down into the well, the lowering end 11 is connected to a guide shoe, which is used for lowering guidance.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A downhole remote-controlled processing device, characterized in that, include: The tube body has a lowering end at one end and a connecting end at the other end, which is used to connect to the continuous tubing. The connecting end is provided with a first cavity, which is connected to the continuous tubing. The lowering end is provided with a second cavity, which has a pressure linkage port. A fluid adapter is disposed inside the tube body, the input port of the fluid adapter is connected to the first cavity, and the first branch port of the fluid adapter is connected to the second cavity; A flexible tube is disposed inside the tube body. One end of the flexible tube is connected to the second branch port of the fluid adapter, and the other end is used to connect to the processing connector. as well as An expander is also disposed inside the tube body, and the expander includes a guide section and an outer expansion section, the guide section corresponding to the flexible tube; the expander is slidably connected to the tube body, one side of the expander is located at the pressure linkage port, and the increase in pressure in the second cavity will push the expander to slide on the tube body through the pressure linkage port; The tube body is provided with a clearance opening, which is corresponding to the processing joint. When the fluid adapter inputs high-pressure fluid into the second cavity, the expander slides towards the connection end, and the end of the outer expansion section that squeezes the flexible tube extends out of the clearance opening. The downhole remote control processing device also includes a shaft; The shaft is disposed inside the tube, and the flexible tube is mounted and fixed on the shaft; the shaft is rotatably connected to the tube, and a linkage structure is provided at the end of the shaft; when the expander moves to squeeze the linkage structure, the expander links the shaft to rotate through the linkage structure. The linkage structure includes linkage teeth and extrusion teeth; The compression teeth are disposed at the end of the expander; The linkage tooth is disposed at the end of the shaft, and the linkage tooth is provided with an inclined surface; The extrusion teeth are correspondingly arranged with the linkage teeth. When the extrusion teeth extrude the inclined surface, the pressure of the extrusion teeth is linked to the rotation of the shaft under the guidance of the inclined surface.

2. The downhole remote control processing device according to claim 1, characterized in that, The expander is an axisymmetric component, and at least two flexible tubes are provided, which are spaced apart along the circumference of the expander. The number and position of the second diversion port and the avoidance port are respectively set to correspond to the flexible pipe.

3. The downhole remote control processing device according to claim 1, characterized in that, The guide section of the expander is cylindrical, and the flexible tube fits into the guide section; the outer expansion section is a horn-shaped outer expansion cone, and the outer expansion section is smoothly connected to the guide section.

4. The downhole remote control processing device according to claim 1, characterized in that, The processing joint includes a perforating nozzle.

5. The downhole remote control processing device according to claim 1, characterized in that, The processing joint includes a laser nozzle.

6. The downhole remote control processing device according to claim 5, characterized in that, The laser nozzle is connected to a power supply line, which is electrically connected to an external power supply device via the flexible tube, the first cavity, and the continuous oil pipe.

7. A downhole processing system, characterized in that, Includes the downhole remote processing device according to any one of claims 1-6.

Images