Ultra-short radius flexible drilling tool

Abstract

The invention discloses an ultra-short radius flexible drilling tool, and relates to the technical field of flexible drilling tools. Comprising a flexible pipe body, a connector is fixedly installed at one end of the flexible pipe body, an adjusting assembly is arranged on the connector, and a plurality of drill bit blades are arranged on the adjusting assembly; the flexible pipe body comprises an outer pipe body, an inner pipe body and a buffer assembly, the inner pipe body is located in the outer pipe body, a liquid storage cavity is formed between the outer pipe body and the inner pipe body, the buffer assembly is arranged in the liquid storage cavity, and the adjusting assembly comprises an electric push rod fixedly installed on a connector. An output shaft is fixedly mounted at the output end of the electric push rod, and a mounting block is fixedly mounted at the end, away from the electric push rod, of the output shaft. Through cooperative use of the adjusting assembly and the buffering assembly, performance reduction caused by vibration or overheating of the drilling tool can be avoided, and the working efficiency and reliability of the drilling tool are greatly improved.

Description

Technical Field

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

[0002] Flexible drilling tools are a type of drilling tools with high flexibility and adaptability, usually used for drilling tasks that require bending or working in complex underground environments. Unlike traditional rigid drilling tools, flexible drilling tools are designed to adapt to various changing working environments. They have certain bendability, scalability and vibration resistance, and can cope with complex underground geological conditions to a certain extent.

[0003] In the prior art, a Chinese patent with publication number "CN117489278A" discloses a self-assembling flexible drilling tool, in which a series of high-throughput transmission pup sections and a flexible drive drill string are both flexible drill strings with good throughput, and the flexible drill string can pass through a short-to-extremely short radius well section extending laterally from the main wellbore. When entering the guided drilling section, the high-throughput transmission pup section series can combine adjacent transmission pup sections through a clutch structure or a clutch device at the bottom of the well, so that the adjacent transmission pup sections remain coaxial, thereby achieving stable drilling of the extended well section of the short-to-extremely short radius well section, and solving the problem that the existing flexible drilling tool cannot provide stable support for the drill bit and drive the drill bit to move forward stably.

[0004] In traditional drilling tools, the blades are often subjected to severe wear during the drilling process, especially in hard rock or high-friction environments. The working angle of the blade will change, resulting in reduced drilling efficiency and shortened blade life. In addition, during the drilling process, the drill tools are often affected by uneven formations or changes in operating conditions, resulting in large vibrations. These vibrations will not only affect the drilling accuracy, but also cause damage to the drill tools. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an ultra-short radius flexible drilling 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 drilling tool comprises a flexible pipe body, one end of which is fixedly mounted with a connector, the connector is provided with an adjustment component, and the adjustment component is provided with a plurality of drill blades; The flexible tube body comprises an outer tube body, an inner tube body and a buffer assembly. The inner tube body is located inside the outer tube body. A liquid storage cavity is provided between the outer tube body and the inner tube body. The buffer assembly is provided inside the liquid storage cavity.

[0007] Preferably, the adjustment assembly includes an electric push rod fixedly mounted on the connecting head, an output shaft is fixedly mounted on the output end of the electric push rod, a mounting block is fixedly mounted on the end of the output shaft away from the electric push rod, a V-shaped push rod is fixedly mounted on the side end surface of the mounting block, and a pointed drill bit is fixedly mounted on the bottom end of the mounting block.

[0008] Preferably, a plurality of mounting frames are fixedly mounted on the connecting head, a plurality of the drill bit blades are respectively arranged inside the plurality of mounting frames, an ejection groove is provided at the end of the connecting head, and a push groove is provided on the side end surface of the connecting head.

[0009] Preferably, the mounting block and the V-shaped push rod are both located inside the ejection groove, and the V-shaped push rod is fitted with the inner side surface of the drill blade through the push groove.

[0010] Preferably, the buffer assembly includes a first positioning frame plate and a second positioning frame plate fixedly mounted on the inner tube body, the first positioning frame plate and the second positioning frame plate are both rotatably mounted with a first connecting frame plate, the first connecting frame plate is movably mounted with a mounting tube, the interior of the mounting tube is slidably connected with a sliding plate, and a sliding rod is fixedly mounted on the sliding plate.

[0011] Preferably, one end of the sliding rod away from the sliding plate extends to the outside of the mounting tube and is fixedly mounted with a second connecting frame plate, a primary spring is fixedly connected to the sliding plate, one end of the primary spring away from the sliding plate is fixedly connected to the inside of the mounting tube, and the primary spring is located on the outside of the sliding rod.

[0012] Preferably, an intermediate spring is fixedly connected on the inner tube body and between the first positioning frame plate and the second positioning frame plate, the intermediate spring is fixedly connected to a buffer block at one end away from the inner tube body, a high-level spring is fixedly installed on the buffer block, a stabilizing plate is fixedly installed on one end of the high-level spring away from the buffer block, and a fitting rod is fixedly installed on the stabilizing plate.

[0013] Preferably, a positioning rod is fixedly installed on the buffer block, and the end of the positioning rod away from the buffer block passes through the stabilizing plate and is fixedly installed with the positioning plate. The buffer block is fixedly connected to a symmetrically arranged first stabilizing frame plate, the first stabilizing frame plate is rotatably connected to the stabilizing rod, and the end of the stabilizing rod away from the first stabilizing frame plate is rotatably connected to the second stabilizing frame plate.

[0014] Preferably, the second stabilizing frame plate is fixedly mounted on the inner tube body, an auxiliary frame is fixedly mounted on the side end surface of the buffer block, and the second connecting frame plate is rotatably connected to the auxiliary frame.

[0015] Preferably, a heat absorbing ring is fixedly installed inside the outer tube body, and a plurality of heat conducting plates are fixedly installed on the heat absorbing ring, and part of the volume of the heat conducting plates is located inside the liquid storage cavity.

[0016] The present invention provides an ultra-short radius flexible drilling tool. Compared with the prior art, it has the following beneficial effects: 1. In the present invention, when the drilling tool is used, the V-shaped push rod on the mounting block is driven by the electric push rod to move downward, and the V-shaped push rod is used to move outward through the ejection groove. Through the cooperation between the V-shaped push rod and the drill blade, the drill blade is turned outward through the limit of the mounting frame. Through the angle turning of the drill blade, the best working angle and shape of the drill blade during the drilling process are maintained, effectively extending the service life of the drilling tool; 2. In the present invention, when the flexible pipe body is subjected to a large vibration, the vibration force generated by it will be transmitted to the high-level spring through the action of the fitting rod, and the high-level spring will be used to complete the first vibration reduction. The remaining vibration force will be transmitted to the intermediate spring through the buffer block, and the intermediate spring will be used to complete the second vibration reduction. The remaining vibration force will be transmitted to the sliding rod through the buffer block, and the sliding rod will be transmitted to the primary spring through the sliding plate, and the primary spring will be used to complete the final vibration reduction. The decreasing vibration reduction method is used to effectively improve the stability of the drilling tool; 3. In the present invention, when the surface of the flexible pipe body is subjected to a large friction force, the heat generated on the flexible pipe body will be transferred to the heat absorbing ring, and the heat will be transferred to the inside of the liquid storage cavity through the heat conductive sheet on the heat absorbing ring. The liquid in the liquid storage cavity will be in uniform contact with the heat conductive sheet due to the vibration in the buffer component, and the heat on the heat conductive sheet can be evenly distributed and effectively conducted, effectively ensuring the stability and safety of the drilling tool under high-load working conditions; 4. The present invention can avoid the performance degradation of the drilling tool due to vibration or overheating by using the adjustment component in conjunction with the buffer component, thereby greatly improving the working efficiency and reliability of the drilling tool. 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 It is a structural schematic diagram of the mounting frame in the present invention; Figure 4 It is a schematic diagram of the structure of the connector in the present invention; Figure 5 It is a structural schematic diagram of the regulating component in the present invention; Figure 6 It is a structural schematic diagram of the buffer component in the present invention; Figure 7 It is a structural schematic diagram of the buffer block in the present invention; Figure 8 It is a schematic diagram of the internal structure of the installation cylinder in the present invention.

[0018] In the figure: 1, flexible tube body; 101, outer tube body; 102, inner tube body; 103, liquid storage chamber; 2, connector; 3, electric push rod; 4, output shaft; 5, mounting block; 6, V-type push rod; 7, mounting frame; 8, ejection groove; 9, pushing groove; 10, first positioning frame plate; 11, second positioning frame plate; 12, first connecting frame plate; 13, mounting cylinder; 14, sliding plate; 15, sliding rod; 16, second connecting frame plate; 17, primary spring; 18, intermediate spring; 19, buffer block; 20, advanced spring; 21, stabilizing plate; 22, fitting rod; 23, positioning rod; 24, positioning plate; 25, first stable frame plate; 26, stabilizing rod; 27, second stable frame plate; 28, auxiliary frame; 29, heat absorbing ring; 30, heat conductive sheet; 31, drill blade; 32, sharp drill bit. 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 drilling tool, comprising a flexible tube body 1, a connector 2 is fixedly installed at one end of the flexible tube body 1, an adjustment component is arranged on the connector 2, a plurality of drill blades 31 are arranged on the adjustment component, the flexible tube body 1 comprises an outer tube body 101, an inner tube body 102 and a buffer component, the inner tube body 102 is located inside the outer tube body 101, a liquid storage cavity 103 is arranged between the outer tube body 101 and the inner tube body 102, the buffer component is arranged inside the liquid storage cavity 103, wherein cooling water is arranged inside the liquid storage cavity 103.

[0021] The adjustment assembly includes an electric push rod 3 fixedly mounted on the connecting head 2, an output shaft 4 is fixedly mounted on the output end of the electric push rod 3, a mounting block 5 is fixedly mounted on the end of the output shaft 4 away from the electric push rod 3, a V-shaped push rod 6 is fixedly mounted on the side end surface of the mounting block 5, a sharp drill bit 32 is fixedly mounted on the bottom end of the mounting block 5, a plurality of mounting frames 7 are fixedly mounted on the connecting head 2, a plurality of drill bit blades 31 are respectively arranged inside the plurality of mounting frames 7, an ejection groove 8 is provided at the end of the connecting head 2, and a side end surface of the connecting head 2 is provided There is a pushing groove 9, and the positions of the mounting block 5 and the V-shaped push rod 6 are both inside the ejection groove 8. The V-shaped push rod 6 fits with the inner side of the drill blade 31 through the pushing groove 9, and the number of the pushing grooves 9 and the V-shaped push rod 6 are both multiple. The end of the V-shaped push rod 6 is set to be chamfered to ensure that the V-shaped push rod 6 can push the drill blade 31 to rotate at an angle when moving downward, and there is a large damping force between the drill blade 31 and the mounting frame 7 to ensure that the drill blade 31 will not be in a loose state when not working.

[0022] In this article, when the drilling tool is used, the electric push rod 3 drives the V-shaped push rod 6 on the mounting block 5 to move downward, and the V-shaped push rod 6 will move outward through the ejection groove 8. Through the cooperation between the V-shaped push rod 6 and the drill blade 31, the drill blade 31 will be flipped outward through the limit of the mounting frame 7. By flipping the angle of the drill blade 31, the optimal working angle and shape of the drill blade 31 during the drilling process are maintained, effectively enhancing the service life of the drilling tool.

[0023] The buffer assembly includes a first positioning frame plate 10 and a second positioning frame plate 11 fixedly mounted on the inner tube body 102, a first connecting frame plate 12 is rotatably mounted on the first positioning frame plate 10 and the second positioning frame plate 11, a mounting tube 13 is movably mounted on the first connecting frame plate 12, a sliding plate 14 is slidably connected to the interior of the mounting tube 13, a sliding rod 15 is fixedly mounted on the sliding plate 14, one end of the sliding rod 15 away from the sliding plate 14 extends to the outside of the mounting tube 13, and a second connecting frame plate 16 is fixedly mounted, a primary spring 17 is fixedly connected to the sliding plate 14, one end of the primary spring 17 away from the sliding plate 14 is fixedly connected to the interior of the mounting tube 13, and the primary spring 17 is fixedly connected to the interior of the mounting tube 13. The spring 17 is located on the outside of the sliding rod 15, and an intermediate spring 18 is fixedly connected on the inner tube 102 and between the first positioning frame plate 10 and the second positioning frame plate 11. The intermediate spring 18 is fixedly connected to a buffer block 19 at one end away from the inner tube 102, and a high-level spring 20 is fixedly installed on the buffer block 19. A stabilizing plate 21 is fixedly installed on the high-level spring 20 at one end away from the buffer block 19, and a fitting rod 22 is fixedly installed on the stabilizing plate 21, wherein one end of the fitting rod 22 away from the stabilizing plate 21 fits on the inner wall of the outer tube 101, ensuring that when the outer tube 101 is subjected to a large vibration, the outer tube 101 will transfer the vibration force to the fitting rod 22; A positioning rod 23 is fixedly installed on the buffer block 19, and the end of the positioning rod 23 away from the buffer block 19 passes through the stabilizing plate 21 and is fixedly installed with a positioning plate 24. A symmetrically arranged first stabilizing frame plate 25 is fixedly connected to the buffer block 19, and a stabilizing rod 26 is rotatably connected to the first stabilizing frame plate 25. The end of the stabilizing rod 26 away from the first stabilizing frame plate 25 is rotatably connected to the second stabilizing frame plate 27, and the second stabilizing frame plate 27 is fixedly installed on the inner tube body 102. An auxiliary frame 28 is fixedly installed on the side end surface of the buffer block 19, and the second connecting frame plate 16 is rotatably connected to the auxiliary frame 28.

[0024] In this article, when the flexible pipe body 1 is subjected to a large vibration, the vibration force generated by it will be transmitted to the high-level spring 20 through the action of the fitting rod 22, and the high-level spring 20 will be used to complete the first vibration reduction. The remaining vibration force will be transmitted to the intermediate spring 18 through the buffer block 19, and the intermediate spring 18 will be used to complete the second vibration reduction. The remaining vibration force will be transmitted to the sliding rod 15 through the buffer block 19, and the sliding rod 15 will be transmitted to the primary spring 17 through the sliding plate 14, and the primary spring 17 will be used to complete the final vibration reduction. The decreasing vibration reduction method is used to effectively improve the stability of the drilling tool.

[0025] A heat absorbing ring 29 is fixedly installed inside the outer tube body 101, and a plurality of heat conducting plates 30 are fixedly installed on the heat absorbing ring 29. Part of the volume of the heat conducting plates 30 is inside the liquid storage cavity 103. The heat conducting plates 30 in the liquid storage cavity 103 will accelerate the dissipation of heat through contact with the coolant.

[0026] In this article, when the surface of the flexible pipe body 1 is subjected to a large friction force, the heat generated on the flexible pipe body 1 will be transferred to the heat absorption ring 29, and the heat will be transferred to the inside of the liquid storage chamber 103 through the heat conductive sheet 30 on the heat absorption ring 29. The liquid in the liquid storage chamber 103 will be evenly contacted with the heat conductive sheet 30 due to the vibration in the buffer component, and the heat on the heat conductive sheet 30 can be evenly distributed and effectively conducted, effectively ensuring the stability and safety of the drilling tool under high-load working conditions.

[0027] Working principle: When in use, the V-shaped push rod 6 on the mounting block 5 is driven downward by the electric push rod 3, and the V-shaped push rod 6 moves outward through the ejection groove 8. Through the cooperation between the V-shaped push rod 6 and the drill blade 31, the drill blade 31 is turned outward through the limit of the mounting frame 7. Through the angle flipping of the drill blade 31, the best working angle and shape of the drill blade 31 during the drilling process are maintained; When the flexible pipe body 1 is subjected to a large vibration, the vibration force generated by it will be transmitted to the high-level spring 20 through the action of the fitting rod 22, and the high-level spring 20 will be used to complete the first vibration reduction. The remaining vibration force will be transmitted to the intermediate spring 18 through the buffer block 19, and the intermediate spring 18 will be used to complete the second vibration reduction. The remaining vibration force will be transmitted to the sliding rod 15 through the buffer block 19, and the sliding rod 15 will be transmitted to the primary spring 17 through the sliding plate 14, and the primary spring 17 will complete the final vibration reduction. The decreasing vibration reduction method is used to ensure that the vibration force generated by the drill bit during operation will not affect the flexible pipe body 1; When the surface of the flexible pipe body 1 is subjected to a large friction force, the heat generated on the flexible pipe body 1 will be transferred to the heat absorption ring 29, and the heat will be transferred to the inside of the liquid storage chamber 103 through the heat conductive sheet 30 on the heat absorption ring 29. The liquid in the liquid storage chamber 103 will be evenly in contact with the heat conductive sheet 30 due to the vibration in the buffer assembly, and the heat on the heat conductive sheet 30 can be evenly distributed and effectively conducted, effectively ensuring the stability and safety of the drilling tool under high-load working conditions.

[0028] 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.

[0029] 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 drilling tool, comprising a flexible pipe body (1), characterized in that: A connector (2) is fixedly mounted on one end of the flexible pipe body (1), an adjustment component is provided on the connector (2), and a plurality of drill blades (31) are provided on the adjustment component; The flexible tube body (1) comprises an outer tube body (101), an inner tube body (102) and a buffer assembly, wherein the inner tube body (102) is located inside the outer tube body (101), a liquid storage cavity (103) is provided between the outer tube body (101) and the inner tube body (102), and the buffer assembly is provided inside the liquid storage cavity (103).

2. The ultra-short radius flexible drilling tool according to claim 1, characterized in that: The adjustment assembly comprises an electric push rod (3) fixedly mounted on the connector (2); an output shaft (4) is fixedly mounted on the output end of the electric push rod (3); a mounting block (5) is fixedly mounted on one end of the output shaft (4) away from the electric push rod (3); a V-shaped push rod (6) is fixedly mounted on the side end surface of the mounting block (5); and a pointed drill bit (32) is fixedly mounted on the bottom end of the mounting block (5).

3. The ultra-short radius flexible drilling tool according to claim 2, characterized in that: A plurality of mounting frames (7) are fixedly mounted on the connector (2), and a plurality of drill blades (31) are respectively arranged inside the plurality of mounting frames (7). An ejection groove (8) is provided at the end of the connector (2), and a push groove (9) is provided at the side end surface of the connector (2).

4. The ultra-short radius flexible drilling tool according to claim 3, characterized in that: The mounting block (5) and the V-shaped push rod (6) are both located inside the ejection groove (8), and the V-shaped push rod (6) is in contact with the inner side surface of the drill blade (31) through the push groove (9).

5. The ultra-short radius flexible drilling tool according to claim 2, characterized in that: The buffer assembly comprises a first positioning frame plate (10) and a second positioning frame plate (11) fixedly mounted on the inner tube body (102); a first connecting frame plate (12) is rotatably mounted on the first positioning frame plate (10) and the second positioning frame plate (11); a mounting tube (13) is movably mounted on the first connecting frame plate (12); a sliding plate (14) is slidably connected to the interior of the mounting tube (13); and a sliding rod (15) is fixedly mounted on the sliding plate (14).

6. The ultra-short radius flexible drilling tool according to claim 5, characterized in that: One end of the sliding rod (15) away from the sliding plate (14) extends to the outside of the mounting tube (13) and is fixedly mounted with a second connecting frame plate (16); a primary spring (17) is fixedly connected to the sliding plate (14); one end of the primary spring (17) away from the sliding plate (14) is fixedly connected to the inside of the mounting tube (13); and the primary spring (17) is located outside the sliding rod (15).

7. The ultra-short radius flexible drilling tool according to claim 6, characterized in that: An intermediate spring (18) is fixedly connected on the inner tube body (102) and between the first positioning frame plate (10) and the second positioning frame plate (11); an end of the intermediate spring (18) away from the inner tube body (102) is fixedly connected to a buffer block (19); an advanced spring (20) is fixedly mounted on the buffer block (19); an end of the advanced spring (20) away from the buffer block (19) is fixedly mounted on a stabilizing plate (21); and an abutting rod (22) is fixedly mounted on the stabilizing plate (21).

8. The ultra-short radius flexible drilling tool according to claim 7, characterized in that: A positioning rod (23) is fixedly mounted on the buffer block (19); one end of the positioning rod (23) away from the buffer block (19) passes through the stabilizing plate (21) and is fixedly mounted with a positioning plate (24); a symmetrically arranged first stabilizing frame plate (25) is fixedly connected to the buffer block (19); a stabilizing rod (26) is rotatably connected to the first stabilizing frame plate (25); and one end of the stabilizing rod (26) away from the first stabilizing frame plate (25) is rotatably connected to a second stabilizing frame plate (27).

9. The ultra-short radius flexible drilling tool according to claim 8, characterized in that: The second stabilizing frame plate (27) is fixedly mounted on the inner tube body (102), an auxiliary frame (28) is fixedly mounted on the side end surface of the buffer block (19), and the second connecting frame plate (16) is rotatably connected to the auxiliary frame (28).

10. The ultra-short radius flexible drilling tool according to claim 1, characterized in that: A heat absorbing ring (29) is fixedly mounted inside the outer tube body (101), and a plurality of heat conducting plates (30) are fixedly mounted on the heat absorbing ring (29), with a portion of the volume of the heat conducting plates (30) being located inside the liquid storage cavity (103).

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