Downhole cooperative acceleration device

Abstract

The invention belongs to the technical field of well drilling devices, and discloses an underground cooperative acceleration device which comprises an outer pipe, an inner shaft pipe and a conversion assembly, a one-way valve is arranged in the outer pipe, and a placement groove formed in the axial direction of the outer pipe is formed in the inner wall of the outer pipe; the first end of the inner shaft tube is inserted into the outer tube from the second end of the outer tube, the second end of the inner shaft tube is arranged outside the outer tube, the inner shaft tube can slide in the axial direction of the outer tube, and an elastic piece is arranged on the outer wall of the inner shaft tube and embedded in the containing groove. The conversion assembly comprises a conversion shell cylinder and a throttling disc, the conversion shell cylinder slides on the downstream of the one-way valve in a sealed mode, the first end of the inner shaft pipe is fixedly inserted into the conversion shell cylinder, the throttling disc is arranged in the conversion shell cylinder, throttling holes are formed in the throttling disc, a rotating rotor is arranged on the side, away from the inner shaft pipe, of the throttling disc, and the rotating rotor rotates on the throttling disc. And rotating blades are fixed on the rotating rotor, so that the vibration energy of the drill column can be converted into the impact energy of rock breaking, the injection energy of drilling fluid is improved, and the drilling speed of well drilling is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling devices, and in particular to an underground coordinated speed-increasing device. Background Art

[0002] During deep drilling, as the depth of the well increases, the in-situ stress on the rock increases, making it more difficult to break it. If the drilling speed is increased by increasing the energy supplied from the ground, such as increasing the drilling pressure and rotation speed to increase mechanical energy, it will cause the drill string to vibrate. The drill string vibration not only affects the construction efficiency of the drilling, but also brings serious safety risks. Frequent and severe vibrations lead to alternating stress in the drill string, which will cause fatigue fracture damage to the drill string, thereby increasing the construction cost and causing great economic losses.

[0003] The existing method to reduce drill string vibration is to use shock absorbers to convert vibration energy into elastic potential energy and internal energy of hydraulic oil, or to release the friction internal energy of springs in shock absorbers. This is not only a waste of energy, but the heat generated will also affect the performance of downhole tools. Summary of the invention

[0004] The purpose of the present invention is to provide a downhole coordinated speed-up device, which can convert the vibration energy of the drill string into the impact energy of rock breaking, and improve the impact energy of the drilling fluid, thereby improving the drilling speed.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An underground coordinated speed-up device, comprising:

[0007] An outer tube, wherein a one-way valve is disposed in the outer tube, wherein the one-way valve is configured to allow fluid to flow from a first end of the outer tube to a second end of the outer tube, wherein an inner wall of the outer tube is provided with a placement groove disposed along an axial direction of the outer tube, wherein the placement groove is disposed downstream of the one-way valve;

[0008] An inner shaft tube, wherein the first end of the inner shaft tube is inserted into the outer tube through the second end of the outer tube, the second end of the inner shaft tube is placed outside the outer tube, the inner shaft tube can slide axially along the outer tube, and the outer wall of the inner shaft tube is provided with an elastic member that can be compressed axially along the inner shaft tube, and the elastic member is embedded in the placement groove;

[0009] A conversion assembly, the conversion assembly includes a conversion shell cylinder and a throttling disk located in the outer tube, the conversion shell cylinder slides downstream of the one-way valve, the first end of the inner shaft tube is fixedly inserted in the conversion shell cylinder, the throttling disk is arranged in the conversion shell cylinder, a throttling hole is arranged on the throttling disk, a rotating rotor is arranged on the side of the throttling disk away from the inner shaft tube, the rotating rotor rotates on the throttling disk, a rotating blade is fixed on the rotating rotor, and a gap is formed between the rotating blade and the throttling disk.

[0010] In some embodiments, the end of the conversion shell tube facing the inner shaft tube has an embedding groove embedded along the axial direction of the inner shaft tube, and the embedding groove includes a large diameter section and a small diameter section. The large diameter section is close to the inner shaft tube, and the rotating blades rotate on the small diameter section. The throttling disk is arranged on the large diameter section, and the first end of the inner shaft tube is threadedly connected to the groove wall of the large diameter section so that the inner shaft tube presses against and fixes the throttling disk.

[0011] In some embodiments, the throttling disk is provided with a central rotating hole, a plurality of the throttling holes surround the central rotating hole, and the rotating rotor is rotatably connected in the central rotating hole; the rotating blades include an impeller shaft, the impeller shaft is provided with a fixing hole, a hole wall of the fixing hole and one of the rotating rotors are provided with a first keyway, and the other is provided with a matching first key, and the impeller shaft is provided with a plurality of blades arranged along the circumference of the impeller shaft.

[0012] In some embodiments, a stabilizing member is disposed in the conversion shell, and one end of the rotating rotor away from the inner shaft tube is connected to the stabilizing member, and the stabilizing member has a flow hole.

[0013] In some embodiments, a first seal is disposed between the outer wall of the conversion shell and the inner wall of the outer tube.

[0014] In some embodiments, the outer tube includes a sliding outer tube, a conversion joint, a protective outer tube and a spline outer tube connected in sequence, the two ends of the conversion joint are connected to the sliding outer tube and the first end of the protective outer tube, the first end of the spline outer tube is connected to the second end of the protective outer tube, the end of the sliding outer tube and the end of the spline outer tube are spaced at the protective outer tube to form the placement groove, and the conversion shell is slidably connected to the sliding outer tube.

[0015] In some embodiments, the inner wall of the spline outer tube and the outer wall of the inner shaft tube are both circumferentially provided with splines that fit into each other, and the splines extend along the axial direction of the inner shaft tube.

[0016] In some embodiments, the spline of the inner wall of the spline outer tube extends to the end of the spline outer tube, and a limiting member is also provided in the protective outer tube, the limiting member is provided between the ends of the spline outer tube, and the elastic member is provided between the limiting member and the end of the conversion joint.

[0017] In some embodiments, a second seal is disposed between the spline outer tube and the inner shaft tube.

[0018] In some embodiments, an outer tube pressure cover is provided at one end of the spline outer tube away from the protective outer tube, the inner shaft tube slides through the outer tube pressure cover, a limiting step is provided on the inner wall of the spline outer tube, and the outer tube pressure cover presses against the second sealing member on the limiting step.

[0019] Beneficial effects of the present invention:

[0020] When the drill string vibrates downward (the drilling pressure increases), the outer tube and the inner shaft tube move relative to each other. At the same time, the inner shaft tube drives the elastic part to press upward against the wall of the mounting groove and is compressed to store energy. The space between the one-way valve and the conversion shell will be reduced, and the pressure of the drilling fluid in the space will increase. The pressurized drilling fluid flows through the rotating rotor, accelerating the rotation of the rotating rotor, driving the rotating blades to accelerate rotation. When the rotating blades coincide with the throttle holes, the flow channel of the drilling fluid becomes smaller, and the drilling fluid acts on the inner shaft tube, thereby transferring energy to the drill bit, increasing the mechanical energy of the drill bit and improving the rock breaking impact energy. When the rotating blades and the throttle holes are misaligned and do not coincide, the flow channel of the drilling fluid becomes larger, the pressure of the drilling fluid passing through increases, and a pressure pulse jet is formed at the drill bit, thereby improving the rock cleaning effect. The combination of the two improves the drilling speed. In addition, the inner shaft is subsequently reset by the elastic force of the elastic member, and the space between the one-way valve and the conversion shell is reset to form a conventional drilling fluid flow channel, and the above actions are repeated continuously as the drill string reciprocates up and down periodically. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the underground coordinated speed-increasing device of the present invention;

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 It is a top view of the rotating blades in the underground coordinated speed-up device of the present invention;

[0024] Figure 4 It is a top view of the throttle disc in the underground coordinated speed-up device of the present invention;

[0025] Figure 5 yes Figure 1 Middle BB cross-section.

[0026] In the figure:

[0027] 1. Outer tube; 11. Sliding outer tube; 12. Conversion joint; 13. Protective outer tube; 14. Spline outer tube; 15. Stopper; 16. Second sealing member; 17. Outer tube gland; 18. Spline;

[0028] 2. Check valve;

[0029] 3. Inner shaft tube;

[0030] 4. Elastic parts;

[0031] 5. Conversion assembly; 51. Conversion shell; 52. Throttle disc; 521. Throttle hole; 522. Center rotating hole; 523. Protruding key; 53. Rotating rotor; 54. Rotating blade; 541. Impeller shaft; 542. Fixing hole; 543. First keyway; 544. Blade; 55. Righting piece; 551. Flow hole; 56. First sealing piece; 57. Anti-erosion cap;

[0032] 6. Upper joint;

[0033] 7. Lower joint;

[0034] 8. Straighten the fastening ring. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] like Figures 1 to 5 As shown, the present invention provides a downhole coordinated speed-up device, which includes an outer tube 1, an inner shaft tube 3 and a conversion assembly 5. A one-way valve 2 is arranged in the outer tube 1, and the one-way valve 2 is configured to allow fluid to flow from the first end of the outer tube 1 to the second end of the outer tube 1. The inner wall of the outer tube 1 is provided with a placement groove arranged along the axial direction of the outer tube 1, and the placement groove is arranged downstream of the one-way valve 2; the first end of the inner shaft tube 3 is inserted into the outer tube 1 through the second end of the outer tube 1, and the second end of the inner shaft tube 3 is placed outside the outer tube 1, the inner shaft tube 3 can slide axially along the outer tube 1, and the outer wall of the inner shaft tube 3 is provided with a pressure-sensitive adhesive that can be compressed axially along the inner shaft tube 3. The elastic member 4 is embedded in the accommodating groove; the conversion assembly 5 includes a conversion shell cylinder 51 and a throttling disk 52 located in the outer tube 1, the conversion shell cylinder 51 is sealed and slides downstream of the one-way valve 2, the first end of the inner shaft tube 3 is fixedly inserted in the conversion shell cylinder 51, the throttling disk 52 is arranged in the conversion shell cylinder 51, and a throttling hole 521 is arranged on the throttling disk 52, and a rotating rotor 53 is arranged on the side of the throttling disk 52 away from the inner shaft tube 3, and the rotating rotor 53 is rotatably arranged on the throttling disk 52, and a rotating blade 54 is fixed on the rotating rotor 53, and there is a gap between the rotating blade 54 and the throttling disk 52.

[0040] When in use, the drill pipe is connected to the first end of the outer tube 1, and the drill bit is connected to the second end of the inner shaft tube 3. When the drill string vibrates downward (the drilling pressure increases), the outer tube 1 and the inner shaft tube 3 move relative to each other, and at the same time, the inner shaft tube 3 drives the elastic member 4 to press upward against the groove wall of the placement groove and is compressed to store energy. The space between the one-way valve 2 and the conversion shell 51 will be reduced, and the pressure of the drilling fluid in the space will increase. The pressurized drilling fluid flows through the rotating rotor 53, accelerating the rotation of the rotating rotor 53, and driving the rotating blades 54 to accelerate the rotation. When the rotating blades 54 overlap with the throttle hole 521, the flow channel of the drilling fluid becomes smaller, and the drilling fluid acts on the inner shaft tube 3, thereby transferring energy to the drill bit, increasing the mechanical energy of the drill bit and improving the rock-breaking impact energy; when the rotating blades 5 and the throttle hole 521 are misaligned and do not overlap, the flow channel of the drilling fluid becomes larger, the pressure of the drilling fluid passing through increases, and a pressure pulse jet is formed at the drill bit, thereby improving the rock cleaning effect. The combination of the two improves the drilling speed, thereby converting the vibration energy of the drill string into the impact energy and impact energy of rock breaking. In addition, the inner shaft tube 3 is then reset by the elastic force of the elastic member 4, and the space in the area between the one-way valve 2 and the conversion shell 51 is reset to form a conventional drilling fluid flow channel, and the above actions are repeated continuously with the periodic up and down reciprocating motion of the drill string.

[0041] like Figure 1 As shown, in some embodiments, the outer tube 1 is formed by connecting the sliding outer tube 11, the conversion joint 12, the protective outer tube 13 and the spline outer tube 14 in sequence, wherein the conversion joint 12 is located between the sliding outer tube 11 and the protective outer tube 13, and the two ends of the conversion joint 12 are respectively screwed into the first end of the sliding outer tube 11 and the first end of the protective outer tube 13, and the end of the sliding outer tube 11 away from the protective outer tube 13 is connected to the upper joint 6 to connect the drill pipe through the upper joint 6; and the spline outer tube 14 is screwed into the second end of the protective outer tube 13, and the end of the sliding outer tube 11 and the end of the spline outer tube 14 are spaced apart in the protective outer tube 13 to form the above-mentioned placement groove to place the elastic member 4. It should be noted here that the elastic member 4 can be, but is not limited to, a disc spring, a hydraulic spring or a common spring, and the elastic member 4 and the inner shaft tube 3 can be fixed in a form such as a clamping connection. The second end of the inner shaft tube 3 protrudes from one end of the spline outer tube 14 away from the protective outer tube 13 so as to be connected to the lower joint 7 on the inner shaft tube 3 and then connected to the drill bit through the lower joint 7 .

[0042] Furthermore, a second seal 16 is provided between the spline outer tube 14 and the inner shaft tube 3, thereby sealing the gap between the spline outer tube 14 and the inner shaft tube 3. Furthermore, an outer tube gland 17 is provided at one end of the spline outer tube 14 away from the protective outer tube 13, and the outer tube gland 17 is screwed on the sliding outer tube 11. A limiting step is provided on the inner wall of the spline outer tube 14, and the outer tube gland 17 abuts against the second seal 16 on the limiting step. Exemplarily, the second seal 16 can be, but is not limited to, a rubber ring or the like.

[0043] like Figure 1 and Figure 5 As shown, in some embodiments, the inner wall of the spline outer tube 14 and the outer wall of the inner shaft tube 3 are circumferentially provided with splines 18 that fit in with each other, and the splines 18 extend along the axial direction of the inner shaft tube 3, thereby preventing the inner shaft tube 3 from twisting. In the current embodiment, the length of the splines 18 on the inner shaft tube 3 along the axial direction of the inner shaft tube 3 is less than the length of the splines 18 on the inner wall of the spline outer tube 14. That is to say, the adjacent splines 18 on the inner wall of the spline outer tube 14 form a spline groove that can accommodate the splines 18 on the inner shaft tube 3.

[0044] In the current embodiment, since the inner shaft tube 3 can move relative to the conversion joint 12, the protective outer tube 13, the spline outer tube 14 and the outer tube gland 17, a seal is also provided between the conversion joint 12 and the inner shaft tube 3, so that a sealed cavity is enclosed between the conversion joint 12, the protective outer tube 13, the spline outer tube 14, the outer tube gland 17 and the inner shaft tube 3, and the sealed cavity is filled with lubricating oil, which can cool the spline 18 and the elastic member 4. Further, in order to allow the lubricating oil to smoothly reach between the spline outer tube 14 and the inner shaft tube 3, in the current embodiment, the spline 18 on the inner wall of the spline outer tube 14 extends to the end of the spline outer tube 14, that is, the spline groove formed by the spline 18 on the inner wall of the spline outer tube 14 faces the opening at one end of the conversion joint 12, so that the lubricating oil can flow in. In addition, in order to prevent the splines 18 of the spline outer tube 14 and the inner shaft tube 3 from being separated from each other, a limiter 15 is further provided in the protective outer tube 13. The limiter 15 is provided at the end of the spline outer tube 14, so that the splines 18 on the inner shaft tube 3 are prevented from being separated from the spline groove by the limiter 15. It should be noted here that the limiter 15 can be fixed at the end of the spline outer tube 14 or in the protective outer tube 13 without limitation. The elastic member 4 is provided between the limiter 15 and the end of the conversion joint 12.

[0045] like Figure 1 As shown, in some embodiments, a supporting step is provided inside the sliding outer tube 11, a straightening and fastening ring 8 is provided on the supporting step, the one-way valve 2 is installed in the straightening and fastening ring 8, and the upper joint 6 abuts against the straightening and fastening ring 8, thereby fixing the one-way valve 2.

[0046] like Figure 1 and Figure 2As shown, in some embodiments, the conversion shell 51 is slidably disposed in the sliding outer tube 11. In order to ensure the seal between the conversion shell 51 and the sliding outer tube 11 and prevent the drilling fluid from passing through the gap between the two, a first sealing member 56 is disposed between the outer wall of the conversion shell 51 and the inner wall of the sliding outer tube 11. Exemplarily, the first sealing member 56 may be, but is not limited to, a sealing ring. Among them, the end of the conversion shell 51 facing the inner shaft tube 3 has an embedding groove embedded along the axial direction of the inner shaft tube 3, and the embedding groove includes a large diameter section and a small diameter section. The large diameter section is close to the inner shaft tube 3, that is, the large diameter section is located on the outer side of the embedding groove, and the rotating blade 54 is rotatably arranged in the small diameter section, and the throttling disc 52 is arranged in the large diameter section, and the inner wall of the large diameter section and the outer wall of the inner shaft tube 3 are provided with matching threads, so that the first end of the inner shaft tube 3 is screwed to the conversion shell 51, so that the end of the inner shaft tube 3 abuts against the throttling disc 52 on the stepped table formed at the connection between the large diameter section and the small diameter section to fix the throttling disc 52. Further, as Figure 2 and Figure 4 As shown, the outer periphery of the throttle disc 52 is provided with relative protruding keys 523, and the inner wall of the large diameter section is provided with a mounting groove, and the protruding key 523 is embedded in the mounting groove to further fix the throttle disc 52. The rotating rotor 53 includes a rotor section in the middle and a rotating shaft section at both ends of the rotor section. The diameter of the rotating shaft section is smaller than the diameter of the rotor section, so that one rotating shaft section of the rotating rotor 53 passes through the rotating blade 54 and is rotatably connected to the throttle disc 52, thereby limiting the rotating blade 54 in the axial direction. It should be noted here that when the rotating rotor 53 limits the rotating blade 54, it is necessary to have a gap between the rotating blade 54 and the throttle disc 52, so as to ensure that the drilling fluid can pass smoothly.

[0047] like Figure 2 , Figure 3 and Figure 4As shown, in order to cooperate with the rotating rotor 53, a central rotating hole 522 is provided on the throttle disc 52, and a plurality of throttle holes 521 are arranged around the central rotating hole 522. The rotating shaft section of the rotating rotor 53 passes through the central rotating hole 522 and is fixed by an anti-erosion cap 57. The rotating blade 54 includes an impeller shaft 541, and the impeller shaft 541 is provided with a fixing hole 542. The rotating shaft section of the rotating rotor 53 passes through the fixing hole 542. One of the hole wall of the fixing hole 542 and the rotating shaft section is provided with a first keyway 543, and the other is provided with a matching first key, so that the rotating blade 54 and the rotating rotor 53 rotate synchronously through the matching of the first keyway 543 and the first key; the circumference of the impeller shaft 541 is provided with a plurality of blades 544 surrounding the impeller shaft 541, and the blades 544 and the throttle hole 521 are overlapped or staggered through the rotation of the plurality of blades 544. In order to ensure the stability of the rotating rotor 53, a straightening piece 55 is provided in the conversion shell 51, and the straightening piece 55 is provided with a straightening hole. The rotating shaft section of the rotating rotor 53 at one end away from the inner shaft tube 3 passes through the above-mentioned straightening hole, and is fixed by the above-mentioned anti-erosion cap 57, and flow holes 551 are provided around the straightening hole to enable the circulation of drilling fluid.

[0048] Furthermore, the vibration energy of the drill string can be converted into rock-breaking impact energy and jet energy by overlapping or staggering the blades 544 and the throttle holes 521 .

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An underground coordinated speed-up device, characterized in that: include: An outer tube (1), wherein a one-way valve (2) is arranged inside the outer tube (1), wherein the one-way valve (2) is configured to allow a fluid to flow from a first end of the outer tube (1) to a second end of the outer tube (1), wherein an inner wall of the outer tube (1) is provided with a placement groove arranged along the axial direction of the outer tube (1), wherein the placement groove is arranged downstream of the one-way valve (2); An inner shaft tube (3), wherein the first end of the inner shaft tube (3) is inserted into the outer tube (1) through the second end of the outer tube (1), the second end of the inner shaft tube (3) is placed outside the outer tube (1), the inner shaft tube (3) is able to slide axially along the outer tube (1), and the outer wall of the inner shaft tube (3) is provided with an elastic member (4) that can be compressed axially along the inner shaft tube (3), and the elastic member (4) is embedded in the placement groove; A conversion assembly (5), the conversion assembly (5) comprising a conversion shell cylinder (51) and a throttling disk (52) located in the outer tube (1), the conversion shell cylinder (51) sliding downstream of the one-way valve (2), the first end of the inner shaft tube (3) fixedly inserted in the conversion shell cylinder (51), the throttling disk (52) arranged in the conversion shell cylinder (51), the throttling disk (52) being provided with a throttling hole (521), a rotating rotor (53) being provided on the side of the throttling disk (52) away from the inner shaft tube (3), the rotating rotor (53) rotating on the throttling disk (52), a rotating blade (54) being fixed on the rotating rotor (53), and a gap being provided between the rotating blade (54) and the throttling disk (52).

2. The underground coordinated speed-up device according to claim 1, characterized in that: The end of the conversion shell cylinder (51) facing the inner shaft tube (3) has an embedding groove embedded along the axial direction of the inner shaft tube (3), the embedding groove includes a large diameter section and a small diameter section, the large diameter section is close to the inner shaft tube (3), the rotating blade (54) rotates on the small diameter section, the throttling disc (52) is arranged on the large diameter section, and the first end of the inner shaft tube (3) is screwed to the groove wall of the large diameter section so that the inner shaft tube (3) abuts against and fixes the throttling disc (52).

3. The underground coordinated speed-up device according to claim 2, characterized in that: The throttling disc (52) is provided with a central rotating hole (522), a plurality of the throttling holes (521) surround the central rotating hole (522), and the rotating rotor (53) is rotatably connected to the central rotating hole (522); the rotating blade (54) comprises an impeller shaft (541), the impeller shaft (541) is provided with a fixing hole (542), a hole wall of the fixing hole (542) and one of the rotating rotor (53) is provided with a first keyway (543), and the other is provided with a matching first key; the impeller shaft (541) is provided with a plurality of blades (544) arranged along the circumference of the impeller shaft (541).

4. The underground coordinated speed-up device according to claim 3, characterized in that: A stabilizing member (55) is provided in the conversion shell (51), and one end of the rotary rotor (53) away from the inner shaft tube (3) is connected to the stabilizing member (55), and the stabilizing member (55) has a flow hole (551).

5. The underground coordinated speed-up device according to claim 1, characterized in that: A first sealing member (56) is provided between the outer wall of the conversion shell cylinder (51) and the inner wall of the outer tube (1).

6. The underground coordinated speed-up device according to any one of claims 1 to 5, characterized in that: The outer tube (1) comprises a sliding outer tube (11), a conversion joint (12), a protective outer tube (13) and a spline outer tube (14) which are connected in sequence; the two ends of the conversion joint (12) are connected to the sliding outer tube (11) and the first end of the protective outer tube (13); the first end of the spline outer tube (14) is connected to the second end of the protective outer tube (13); the end of the sliding outer tube (11) and the end of the spline outer tube (14) are spaced apart from each other in the protective outer tube (13) to form the placement groove; and the conversion shell (51) is slidably connected to the sliding outer tube (11).

7. The underground coordinated speed-up device according to claim 6, characterized in that: The inner wall of the spline outer tube (14) and the outer wall of the inner shaft tube (3) are both circumferentially provided with splines (18) that fit in with each other, and the splines (18) extend along the axial direction of the inner shaft tube (3).

8. The underground coordinated speed-up device according to claim 7, characterized in that: The spline (18) on the inner wall of the spline outer tube (14) extends to the end of the spline outer tube (14); a limiter (15) is also provided in the protective outer tube (13); the limiter (15) is provided between the ends of the spline outer tube (14); and the elastic member (4) is provided between the limiter (15) and the end of the conversion joint (12).

9. The underground coordinated speed-up device according to claim 6, characterized in that: A second sealing member (16) is provided between the spline outer tube (14) and the inner shaft tube (3).

10. The underground coordinated speed-up device according to claim 9, characterized in that: An outer tube pressure cover (17) is provided at one end of the spline outer tube (14) away from the protective outer tube (13), the inner shaft tube (3) slides through the outer tube pressure cover (17), a limiting step is provided on the inner wall of the spline outer tube (14), and the outer tube pressure cover (17) presses against the second sealing member (16) on the limiting step.

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