Ultra-short radius flexible windowing tool

Abstract

The invention discloses an ultra-short radius flexible windowing tool, and relates to the technical field of windowing tools. Comprising an outer sleeve-shaped tool string, an inner drilling tool string is arranged in the outer sleeve-shaped tool string in a penetrating mode, an auxiliary assembly is arranged at the inner bottom of the outer sleeve-shaped tool string, and the outer sleeve-shaped tool string is stably fixed in the inner wall of a casing pipe through the auxiliary assembly; a cleaning assembly is arranged on the auxiliary assembly, and friction between the external sleeve-shaped tool string and the sleeve is reduced through the cleaning assembly; a stabilizing assembly is arranged in the outer sleeve-shaped tool string, the stability between the auxiliary assembly and the sleeve is improved through the stabilizing assembly, and the cleaning assembly comprises a lifting groove formed in the outer sleeve-shaped tool string. Through cooperative use of the auxiliary assembly, the cleaning assembly and the stabilizing assembly, the window opening process of the window opening tool in the sleeve is effectively optimized, and higher stability, efficiency and precision are provided.

Description

Technical Field

[0001] The invention relates to the technical field of window opening tools, in particular to an ultra-short radius flexible window opening tool. Background Art

[0002] In the field of coalbed methane extraction, a vertical well or a vertical well and a horizontal well are usually drilled by a drilling rig, and then metal casing and fiberglass casing are lowered into the wellbore for cementing. Then, holes are drilled and windows are opened on the casing of the coal seam section. Then, a hydraulic jet drilling string is lowered through the casing window to perform jet drilling to relieve pressure. The coalbed methane resources are extracted by desorbing the coalbed methane through depressurization and drainage. An important part of this extraction method is to open windows on the casing of the coal seam section.

[0003] In the prior art, a Chinese patent with publication number "CN102146779B" discloses a tool for positioning and fixing angles in underground drilling and windowing for horizontal wells. By arranging an angle measuring device at the front end of a compass carrier, the inclination angle of the window opening position can be accurately measured on the ground. Therefore, the window opening in underground horizontal wells can be accurately positioned and fixed in angle, thereby improving the window opening efficiency, making the treatment of the coal seam after the window opening more reasonable, and effectively increasing the production of coalbed methane. Furthermore, the external sleeve-shaped tool string of the present invention is provided with a limiting sleeve, and the internal drilling tool string is provided with a limiting anti-torsion body. The limiting anti-torsion body is clamped and connected in the limiting sleeve to form a limiting anti-torsion device. On the one hand, it can prevent the drill bit at the front end of the drill tool from colliding with the front end wall of the carrier and being damaged when injecting the internal drilling tool string; on the other hand, it can avoid the possible damage caused by reverse twisting when the drill tool encounters greater resistance during the drilling window opening process. The problem that the existing casing window opening tool cannot be positioned underground, especially for horizontal wells, it is difficult to achieve a certain angle for window opening, and the positioning and angle cannot be achieved, resulting in the inability to fully expand the gas production area and increase the coalbed methane production during coalbed methane exploitation, and it is difficult to carry out normal exploitation of different coal seams.

[0004] When some existing window opening tools are used to open windows in casing, the window opening tools are easily affected by friction inside the casing, resulting in jamming or uneven operation. At the same time, the window opening tools are prone to position displacement during the window opening operation, resulting in reduced operation accuracy and uneven pressure distribution, which will ultimately affect the window opening accuracy. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an ultra-short radius flexible window opening tool, which solves the problems mentioned in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: An ultra-short radius flexible window opening tool, comprising an outer sleeve-shaped tool string, an inner drilling tool string is inserted into the inner part of the outer sleeve-shaped tool string, an auxiliary component is arranged at the inner bottom of the outer sleeve-shaped tool string, and the outer sleeve-shaped tool string is stably fixed in the inner wall of the casing through the auxiliary component; The auxiliary component is provided with a cleaning component, and the friction between the outer sleeve-shaped tool string and the casing is reduced by the cleaning component; A stabilizing component is arranged inside the outer sleeve-shaped tool string, and the stabilizing component is used to improve the stability between the auxiliary component and the casing.

[0007] Preferably, the cleaning assembly includes a lifting groove opened inside the external sleeve-shaped tool string, an electric push rod is fixedly installed on the inner top of the lifting groove, a lifting block is fixedly installed on the output shaft of the electric push rod, and a lower pressure rod is fixedly installed on the lower end surface of the lifting block.

[0008] Preferably, a lower pressure column is fixedly installed on the bottom end of the lower pressure rod, a threaded hole is opened on the lower end surface of the lower pressure column, a limiting ring is rotatably installed on the lower end surface of the external sleeve-shaped tool string, a cleaning arc head is fixedly installed on the lower end surface of the limiting ring, and a threaded rod is fixedly installed on the upper end surface of the cleaning arc head.

[0009] Preferably, a downward pressure groove is provided on the lower end surface of the external sleeve-shaped tool string, the downward pressure column is located inside the downward pressure groove, the end of the threaded rod away from the cleaning arc head extends to the inside of the downward pressure groove and is threadedly connected to the threaded hole, the lifting block slides with the lifting groove, and the lifting groove slides with the downward pressure groove.

[0010] Preferably, the auxiliary component includes a spiral pattern arranged on the lower pressure rod, a rotating groove is opened between the lifting groove and the lower pressure groove, a rotating disk is rotatably installed inside the rotating groove, a pushing arc block is fixedly installed on the side end surface of the rotating disk, and a spiral hole is opened on the rotating disk.

[0011] Preferably, a storage groove is provided on the outer side surface of the external sleeve-shaped tool string, a stabilizing block is arranged inside the storage groove, a positioning rod is fixedly installed on the stabilizing block, the positioning rod extends to the inside of the rotating groove at one end away from the stabilizing block, and a compressed arc block is fixedly installed thereon, a limiting groove is provided inside the external sleeve-shaped tool string and on the outside of the rotating groove, a limiting block is fixedly installed on the positioning rod, and a spring is fixedly connected to the limiting block.

[0012] Preferably, the pushing arc block is in contact with the compressed arc block, one end of the spring away from the limiting block is fixedly connected to the inside of the limiting groove, and the spring is located on the outside of the positioning rod.

[0013] Preferably, the stabilizing assembly includes a sliding groove arranged in an external sleeve-shaped tool string, a sliding block is fixedly installed on the side end surface of the internal drilling tool string, an air cylinder is fixedly installed in the external sleeve-shaped tool string and below the sliding groove, a push rod is slidably installed on the air cylinder, and the end of the push rod away from the air cylinder is fixedly connected to the sliding block.

[0014] Preferably, the air outlet of the air storage cylinder is fixedly connected to an air outlet pipe, the end of the air outlet pipe away from the air storage cylinder is fixedly connected to an annular tube, the annular tube is fixedly connected to a connecting tube, the connecting tube is fixedly connected to a telescopic hose, an installation groove is opened on the stabilizing block, a pressurized air bag is arranged inside the installation groove, and the pressurized air bag is fixedly connected to a connecting tube.

[0015] Preferably, one end of the connecting tube away from the pressurized airbag is fixedly connected to the telescopic hose, and the sliding block is slidably connected to the sliding groove.

[0016] The present invention provides an ultra-short radius flexible window opening tool. Compared with the prior art, it has the following beneficial effects: 1. The present invention drives the lifting block to lift and reciprocate in the lifting slot by an electric push rod, and the lower pressure column on the lower pressure rod moves synchronously in the lower pressure slot, and the threaded hole on the lower pressure column cooperates with the threaded rod on the cleaning arc head, and the cleaning arc head is then limited and rotated on the external sleeve-shaped tool string through a limit ring, so that when the external sleeve-shaped tool string moves in the casing, the rotating cleaning arc head is used to clean the inner wall of the casing, thereby reducing the friction between the external sleeve-shaped tool string and the casing, ensuring that the internal drilling tool string can effectively open a window on the casing; 2. In the present invention, when it is necessary to open a window at a designated position, the rotation of the cleaning arc head is stopped, and the electric push rod is used to continuously drive the lifting block to descend. The lower pressing rod on the lifting block will cooperate with the spiral opening on the rotating disk through the spiral pattern, and the rotating groove will limit the rotating disk, so that the rotating disk rotates in the rotating groove, and the pushing arc block on the rotating disk is used to squeeze and push the compressed arc block, and the compressed arc block will synchronously drive the stabilizing block on the positioning rod to fit the inner wall of the casing, effectively ensuring the stability of the window opening tool on the inner wall of the casing, and no deviation or uneven pressure distribution will occur; 3. In the present invention, when the internal drilling tool string performs the window opening operation, the internal drilling tool string will move downward in the external sleeve-shaped tool string, and the sliding block on the internal drilling tool string will drive the piston on the push rod to move in the gas storage cylinder, and the gas in the gas storage cylinder will slowly enter the connecting pipe through the gas outlet pipe, and the gas in the connecting pipe will enter the pressurized air bag through the telescopic hose and the connecting pipe, and will bulge out from the installation groove through the bulging of the pressurized air bag, and the bulged pressurized air bag will fit on the inner wall of the casing, effectively enhancing the stability between the external sleeve-shaped tool string and the casing, ensuring that the window opening tool can maintain a good positioning in the casing and an effective window opening operation; 4. The present invention effectively optimizes the window opening process of the window opening tool in the casing through the coordinated use of the auxiliary component, the cleaning component and the stabilizing component, and provides higher stability, efficiency and precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 for Figure 2 The enlarged view of point A in the middle; Figure 4 It is a structural schematic diagram of the auxiliary components in the present invention; Figure 5 It is a structural schematic diagram of the annular tube in the present invention; Figure 6 is a cross-sectional view of a stabilizing block in the present invention; Figure 7 It is a schematic diagram of the structure of the cleaning component in the present invention; Figure 8 It is a cross-sectional view of the outer sleeve-shaped tool string in the present invention.

[0018] In the figure: 1. External sleeve-shaped tool string; 2. Internal drilling tool string; 3. Lifting groove; 4. Electric push rod; 5. Lifting block; 6. Pressing rod; 7. Pressing column; 8. Threaded hole; 9. Limiting ring; 10. Cleaning arc head; 11. Threaded rod; 12. Pressing groove; 13. Spiral pattern; 14. Rotating groove; 15. Rotating disk; 16. Pushing arc block; 17. Spiral hole; 18. Storage groove; 19. Stabilizing block; 20. Positioning rod; 21. Pressurized arc block; 22. Limiting groove; 23. Limiting block; 24. Spring; 25. Sliding groove; 26. Sliding block; 27. Air storage cylinder; 28. Pushing rod; 29. ​​Exhaust pipe; 30. Ring pipe; 31. Connecting pipe; 32. Telescopic hose; 33. Installation groove; 34. Pressurized air bag; 35. Connecting pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-8 The present invention is an ultra-short radius flexible window opening tool, comprising an external sleeve-shaped tool string 1, an internal drilling tool string 2 is inserted into the internal part of the external sleeve-shaped tool string 1, and an auxiliary component is arranged at the inner bottom of the external sleeve-shaped tool string 1, through which the external sleeve-shaped tool string 1 is stably fixed in the inner wall of the casing, wherein the external sleeve-shaped tool string 1 is composed of a pumping pipe, a limit sleeve, a connecting pipe and a guide device fixedly connected from top to bottom, and the internal drilling tool string 2 is composed of a limit anti-torsion body, a screw drill, an automatic feeding device, a flexible rod and a cutter head connected from top to bottom, a continuous oil pipe passes through the limit anti-torsion body and is conductively connected to the screw drill; the limit anti-torsion body is clamped and connected in the limit sleeve, and the flexible rod and the cutter head at the front end thereof correspond to the opening of the side wall of the guide device. Since the technology is well known to the personnel in the field, it will not be described in detail here; The auxiliary component is provided with a cleaning component, and the friction between the external sleeve-shaped tool string 1 and the casing is reduced by the cleaning component. The cleaning component includes a lifting groove 3 opened inside the external sleeve-shaped tool string 1, an electric push rod 4 is fixedly installed on the inner top of the lifting groove 3, a lifting block 5 is fixedly installed on the output shaft of the electric push rod 4, a lower end surface of the lifting block 5 is fixedly installed with a pressing rod 6, a lower end of the pressing rod 6 is fixedly installed with a pressing column 7, and a threaded hole 8 is opened on the lower end surface of the pressing column 7. A limiting ring 9 is rotatably installed on the lower end surface, a cleaning arc head 10 is fixedly installed on the lower end surface of the limiting ring 9, a threaded rod 11 is fixedly installed on the upper end surface of the cleaning arc head 10, a lower end surface of the external sleeve-shaped tool string 1 is provided with a lower pressure groove 12, the position of the lower pressure column 7 is located inside the lower pressure groove 12, one end of the threaded rod 11 away from the cleaning arc head 10 extends to the inside of the lower pressure groove 12, and is threadedly connected with the threaded hole 8, the lifting block 5 and the lifting groove 3 are limited to slide, and the lifting groove 3 and the lower pressure groove 12 are limited to slide.

[0021] In this embodiment, the lifting block 5 is driven by the electric push rod 4 to reciprocate and lift in the lifting groove 3, and the lower pressure column 7 on the lower pressure rod 6 will move synchronously in the lower pressure groove 12, and the threaded hole 8 on the lower pressure column 7 is cooperated with the threaded rod 11 on the cleaning arc head 10, and the cleaning arc head 10 is then limited and rotated on the external sleeve tool string 1 through the limit ring 9, so that when the external sleeve tool string 1 moves in the casing, the rotating cleaning arc head 10 is used to clean the inner wall of the casing, thereby reducing the friction between the external sleeve tool string 1 and the casing, ensuring that the internal drilling tool string 2 can effectively open a window in the casing.

[0022] The auxiliary component includes a spiral pattern 13 arranged on the lower pressure rod 6, a rotating groove 14 is provided between the lifting groove 3 and the lower pressure groove 12, a rotating disk 15 is rotatably installed inside the rotating groove 14, and a pushing arc block 16 is fixedly installed on the side end surface of the rotating disk 15, a storage groove 18 is provided on the outer side surface of the external sleeve-shaped tool string 1, and a stabilizing block 19 is provided inside the storage groove 18, and a positioning rod 20 is fixedly installed on the stabilizing block 19, and one end of the positioning rod 20 away from the stabilizing block 19 extends to the inside of the rotating groove 14, and a compressed arc block 21 is fixedly installed, and a spiral pattern 13 is provided on the rotating disk 15. Hole 17, a limiting groove 22 is provided inside the outer sleeve-shaped tool string 1 and on the outside of the rotating groove 14, a limiting block 23 is fixedly installed on the positioning rod 20, and a spring 24 is fixedly connected to the limiting block 23 to push the arc block 16 to contact the compressed arc block 21, and one end of the spring 24 away from the limiting block 23 is fixedly connected to the inside of the limiting groove 22, and the spring 24 is on the outside of the positioning rod 20, wherein the pressing rod 6 is slidably installed between the rotating disk 15, and in the absence of the spiral pattern 13, the pressing rod 6 will not affect the state of the rotating disk 15 during the reciprocating lifting process.

[0023] In this embodiment, when it is necessary to open a window at a specified position, the rotation of the cleaning arc head 10 is stopped, and the electric push rod 4 is used to continuously drive the lifting block 5 to descend. The lower pressure rod 6 on the lifting block 5 will cooperate with the spiral mouth on the rotating disk 15 through the spiral pattern 13, and the rotating groove 14 limits the rotating disk 15, so that the rotating disk 15 rotates in the rotating groove 14, and the pushing arc block 16 on the rotating disk 15 is used to squeeze and push the compressed arc block 21. The compressed arc block 21 will synchronously drive the stabilizing block 19 on the positioning rod 20 to fit the inner wall of the casing, effectively ensuring the stability of the window opening tool on the inner wall of the casing, and no offset or uneven pressure distribution will occur.

[0024] A stabilizing component is provided in the external sleeve-shaped tool string 1, and the stabilizing component is used to improve the stability between the auxiliary component and the casing. The stabilizing component includes a sliding groove 25 provided in the external sleeve-shaped tool string 1, a sliding block 26 is fixedly installed on the side end surface of the internal drilling tool string 2, and an air storage cylinder 27 is fixedly installed in the external sleeve-shaped tool string 1 and below the sliding groove 25. A push rod 28 is slidably installed on the air storage cylinder 27, and one end of the push rod 28 away from the air storage cylinder 27 is fixedly connected to the sliding block 26, and the air outlet of the air storage cylinder 27 is fixedly connected to an air outlet pipe 29, and one end of the air outlet pipe 29 away from the air storage cylinder 27 An annular tube 30 is fixedly connected, a connecting tube 31 is fixedly connected to the annular tube 30, a telescopic hose 32 is fixedly connected to the connecting tube 31, a mounting groove 33 is opened on the stabilizing block 19, a pressurized air bag 34 is arranged inside the mounting groove 33, a connecting tube 35 is fixedly connected to the pressurized air bag 34, one end of the connecting tube 31 away from the pressurized air bag 34 is fixedly connected to the telescopic hose 32, the sliding block 26 is slidably connected to the sliding groove 25, wherein the air outlet pipe 29, the annular tube 30, and the connecting tube 31 are all arranged inside the external sleeve-shaped tool string 1 to ensure that they will not affect the normal use of the internal drilling tool string 2.

[0025] In this embodiment, when the internal drilling tool string 2 performs the window opening operation, the internal drilling tool string 2 will move downward in the external sleeve-shaped tool string 1, and the sliding block 26 on the internal drilling tool string 2 will drive the piston on the push rod 28 to move in the air storage cylinder 27. The gas in the air storage cylinder 27 will slowly enter the connecting pipe 31 through the air outlet pipe 29, and the gas in the connecting pipe 31 will enter the pressurized air bag 34 through the telescopic hose 32 and the connecting pipe 35. The pressurized air bag 34 will bulge out from the mounting groove 33 through the bulging of the pressurized air bag 34, and the bulged pressurized air bag 34 will fit on the inner wall of the casing, effectively enhancing the stability between the external sleeve-shaped tool string 1 and the casing, ensuring that the window opening tool can maintain a good positioning in the casing and an effective window opening operation.

[0026] Working principle: When in use, the lifting block 5 is driven by the electric push rod 4 to lift and reciprocate in the lifting groove 3, and the lower pressure column 7 on the lower pressure rod 6 will move synchronously in the lower pressure groove 12, and the threaded hole 8 on the lower pressure column 7 cooperates with the threaded rod 11 on the cleaning arc head 10, and the cleaning arc head 10 is then limited and rotated on the external sleeve-shaped tool string 1 through the limit ring 9, so that when the external sleeve-shaped tool string 1 moves in the casing, the rotating cleaning arc head 10 is used to clean the inner wall of the casing, thereby reducing the friction between the external sleeve-shaped tool string 1 and the casing; When it is necessary to open a window at a designated position, the rotation of the cleaning arc head 10 is stopped, and the electric push rod 4 is used to continuously drive the lifting block 5 to descend. The lower pressing rod 6 on the lifting block 5 will cooperate with the spiral opening on the rotating disk 15 through the spiral pattern 13, and the rotating groove 14 limits the rotating disk 15, so that the rotating disk 15 rotates in the rotating groove 14, and the pushing arc block 16 on the rotating disk 15 is used to squeeze and push the compressed arc block 21, and the compressed arc block 21 will synchronously drive the stabilizing block 19 on the positioning rod 20 to fit the inner wall of the casing, effectively ensuring the stability of the window opening tool on the inner wall of the casing; When the internal drilling tool string 2 is performing the window opening operation, the internal drilling tool string 2 will move downward in the external sleeve-shaped tool string 1, and the sliding block 26 on the internal drilling tool string 2 will drive the piston on the push rod 28 to move in the air storage cylinder 27. The gas in the air storage cylinder 27 will slowly enter the connecting pipe 31 through the air outlet pipe 29, and the gas in the connecting pipe 31 will enter the pressurized air bag 34 through the telescopic hose 32 and the connecting pipe 35. The pressurized air bag 34 will bulge out from the mounting groove 33 through the bulging of the pressurized air bag 34, and the bulged pressurized air bag 34 will fit on the inner wall of the casing, effectively enhancing the stability between the external sleeve-shaped tool string 1 and the casing, ensuring that the window opening tool can maintain a good positioning in the casing and an effective window opening operation.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. An ultra-short radius flexible window opening tool, comprising an outer sleeve-shaped tool string (1), characterized in that: An internal drilling tool string (2) is inserted into the interior of the external sleeve-shaped tool string (1), and an auxiliary component is provided at the inner bottom of the external sleeve-shaped tool string (1), so that the external sleeve-shaped tool string (1) is stably fixed in the inner wall of the casing through the auxiliary component; The auxiliary component is provided with a cleaning component, and the friction between the external sleeve-shaped tool string (1) and the sleeve is reduced by the cleaning component. The cleaning component comprises a lifting groove (3) opened inside the external sleeve-shaped tool string (1), an electric push rod (4) is fixedly mounted on the inner top of the lifting groove (3), a lifting block (5) is fixedly mounted on the output shaft of the electric push rod (4), and a lower pressure rod (6) is fixedly mounted on the lower end surface of the lifting block (5); The outer sleeve-shaped tool string (1) is provided with a stabilizing component, and the stabilizing component is used to improve the stability between the auxiliary component and the casing.

2. The ultra-short radius flexible window opening tool according to claim 1, characterized in that: A lower pressure column (7) is fixedly mounted on the bottom end of the lower pressure rod (6), a threaded hole (8) is provided on the lower end surface of the lower pressure column (7), a limit ring (9) is rotatably mounted on the lower end surface of the external sleeve-shaped tool string (1), a cleaning arc head (10) is fixedly mounted on the lower end surface of the limit ring (9), and a threaded rod (11) is fixedly mounted on the upper end surface of the cleaning arc head (10).

3. The ultra-short radius flexible window opening tool according to claim 2, characterized in that: A lower pressure groove (12) is provided on the lower end surface of the external sleeve-shaped tool string (1), the lower pressure column (7) is located inside the lower pressure groove (12), one end of the threaded rod (11) away from the cleaning arc head (10) extends to the inside of the lower pressure groove (12) and is threadedly connected to the threaded hole (8), the lifting block (5) and the lifting groove (3) are limited to slide, and the lifting groove (3) and the lower pressure groove (12) are limited to slide.

4. The ultra-short radius flexible window opening tool according to claim 1, characterized in that: The auxiliary component comprises a spiral pattern (13) arranged on the lower pressing rod (6); a rotating groove (14) is provided between the lifting groove (3) and the lower pressing groove (12); a rotating disk (15) is rotatably installed inside the rotating groove (14); a pushing arc block (16) is fixedly installed on the side end surface of the rotating disk (15); and a spiral hole (17) is provided on the rotating disk (15).

5. The ultra-short radius flexible window opening tool according to claim 4, characterized in that: The outer side surface of the external sleeve-shaped tool string (1) is provided with a storage groove (18), and a stabilizing block (19) is arranged inside the storage groove (18). A positioning rod (20) is fixedly installed on the stabilizing block (19). The end of the positioning rod (20) away from the stabilizing block (19) extends to the inside of the rotating groove (14) and is fixedly installed with a pressure arc block (21). A limiting groove (22) is provided inside the external sleeve-shaped tool string (1) and on the outside of the rotating groove (14). A limiting block (23) is fixedly installed on the positioning rod (20), and a spring (24) is fixedly connected to the limiting block (23).

6. The ultra-short radius flexible window opening tool according to claim 5, characterized in that: The pushing arc block (16) contacts the compressed arc block (21), one end of the spring (24) away from the limiting block (23) is fixedly connected to the inside of the limiting groove (22), and the spring (24) is located outside the positioning rod (20).

7. The ultra-short radius flexible window opening tool according to claim 5, characterized in that: The stabilizing assembly comprises a sliding groove (25) arranged in the outer sleeve-shaped tool string (1), a sliding block (26) is fixedly installed on the side end surface of the inner drilling tool string (2), an air storage cylinder (27) is fixedly installed in the outer sleeve-shaped tool string (1) and below the sliding groove (25), a push rod (28) is slidably installed on the air storage cylinder (27), and one end of the push rod (28) away from the air storage cylinder (27) is fixedly connected to the sliding block (26).

8. The ultra-short radius flexible window opening tool according to claim 7, characterized in that: The air outlet of the air storage cylinder (27) is fixedly connected to an air outlet pipe (29), one end of the air outlet pipe (29) away from the air storage cylinder (27) is fixedly connected to an annular tube (30), the annular tube (30) is fixedly connected to a connecting tube (31), the connecting tube (31) is fixedly connected to a telescopic hose (32), the stabilizing block (19) is provided with a mounting groove (33), a pressurized air bag (34) is arranged inside the mounting groove (33), and the pressurized air bag (34) is fixedly connected to a connecting tube (35).

9. The ultra-short radius flexible window opening tool according to claim 8, characterized in that: One end of the connecting pipe (31) away from the pressurized airbag (34) is fixedly connected to the telescopic hose (32), and the sliding block (26) is slidably connected to the sliding groove (25).

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