Rotary guiding shoe

Abstract

The invention belongs to the technical field of drilling development in the petroleum and natural gas industry, and discloses a rotary guiding shoe. The rotary guiding shoe is connected to the front end of the casing pipe, an adjusting assembly and a rotating assembly are arranged in a barrel of the rotary guiding shoe, the rotating assembly can drive the guiding shoe part to rotate so as to carry out reaming, and the situation that the bottom of the casing pipe scrapes the well wall or is inserted into the well wall and consequently the casing pipe is blocked can be avoided; the adjusting assembly is used for adjusting the rotating speed of the rotating assembly to solve the problems of clamping stagnation of the sleeve and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling and development in the oil and gas industry, and particularly relates to a rotary guide shoe with adjustable rotation speed. Background Art

[0002] Reaming refers to the process of trimming the wellbore, removing debris attached to the wellbore wall, and making the wellbore unobstructed by circulating while rotating and lowering or lifting the casing. In the oil and gas industry, casing opening is usually used to complete drilling reaming. During the process of running production casing after oil or gas completion, it is crucial to smoothly run the production casing to the predetermined depth at one time to achieve the predetermined goal. However, due to low formation stability or many wellbore trajectories, problems such as wellbore diameter reduction, collapse, and large frictional resistance may occur during the casing running process, resulting in the inability to run the casing to the desired position.

[0003] In the prior art, in order to facilitate the smooth running of the casing to the target depth, mechanical power equipment is usually set at the wellhead, and the casing is rotated by mechanical power to assist in casing reaming. However, this method is limited by the casing connection thread or the torque of the mechanical power equipment, and has great limitations. Or, the prior art also uses a hydraulic drive device to assist in casing reaming. However, the main component of the existing hydraulic drive device is a turbine. The ordinary turbine has a high rotation speed and cannot be speed-regulated, and may create a new wellbore or torque-lock the casing when assisting in casing reaming, with many uncertain factors.

[0004] Therefore, there is an urgent need for a rotary guide shoe with adjustable rotation speed installed on the casing that can solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a rotary guide shoe whose rotation speed can be adjusted.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A rotary guide shoe is connected to a casing, and includes: a cylinder body and a guide shoe part. One end of the cylinder body is connected to the casing, and the other end is connected to the guide shoe part. An adjusting component and a rotating component are arranged in the cylinder body. When a liquid flows through the rotating component, the rotating component can drive the guide shoe part to rotate;

[0008] The adjusting assembly includes an adjusting shaft and a fluid guide. The fluid guide is fixedly arranged in the cylinder body. A first through hole is arranged on the fluid guide. The adjusting shaft is movably arranged in the cylinder body. An overflow hole is arranged on the adjusting shaft. The first through hole can selectively overlap with the overflow hole to change the flow rate of the liquid flowing through the rotating assembly. A plurality of overflow holes are arranged. The diameters of at least two overflow holes are different, and the diameter of the overflow hole is not greater than the diameter of the first through hole. The first through hole selectively overlaps with the overflow hole.

[0009] Preferably, the adjusting assembly further includes a guide post. The guide post is fixedly connected to the cylinder body. A guide groove is arranged on the adjusting shaft. The guide post is located in the guide groove to provide guidance for the movement of the adjusting shaft.

[0010] Preferably, the guide groove includes alternately arranged long grooves and short grooves. The overflow holes are correspondingly arranged with the long grooves. The guide post can be placed in the long groove or the short groove so that the first through hole selectively overlaps with the overflow hole. When the guide post is placed in different long grooves, the first through hole can overlap with the overflow holes of different diameters.

[0011] Preferably, the adjusting assembly further includes an elastic member. One end of the elastic member is connected to the adjusting shaft and is used to drive the adjusting shaft so that the adjusting shaft has a tendency to make the bottom of the long groove or the short groove abut against the guide post.

[0012] Preferably, a transition groove is further arranged on one side of the adjusting shaft away from the bottoms of the long groove and the short groove. The transition groove includes an inclined section. The transition groove is used to connect adjacent long grooves and short grooves.

[0013] Preferably, a driving cavity is formed in the cylinder body. The driving cavity is connected to a hydraulic pump and is used to drive the adjusting shaft to move so that the adjusting shaft has a tendency to make the bottom of the long groove or the short groove disengage from abutting against the guide post.

[0014] Preferably, the cylinder body is provided with a liquid inlet hole, and the shoe part is provided with a liquid outlet hole. The rotating assembly includes an inner driving cavity and an outer driving cavity. Both the inner driving cavity and the outer driving cavity are communicated with the liquid outlet hole. The liquid inlet hole is communicated with the inner driving cavity. When the overflow hole is communicated with the first through hole, the liquid inlet hole is communicated with both the inner driving cavity and the outer driving cavity.

[0015] Preferably, a fluid guiding body is further arranged in the cylinder body. The fluid guiding body is rotatably connected to the rotating assembly and separates the inner driving cavity and the outer driving cavity.

[0016] Preferably, a third through hole is provided at one end of the rotating assembly away from the fluid guiding body, and the outer drive cavity communicates with the liquid outlet hole through the third through hole.

[0017] Preferably, the adjusting shaft is fixed to the cylinder body by a shear pin. When the shear pin breaks, the adjusting shaft can move relative to the cylinder body.

[0018] Advantages of the present invention:

[0019] The present invention provides a rotary guide shoe, which is connected to the front end of the casing. An adjusting assembly and a rotating assembly are arranged in the cylinder body of the rotary guide shoe. The rotating assembly can drive the guide shoe part to rotate for reaming, which can prevent the bottom of the casing from scraping the wellbore or inserting into the wellbore, resulting in casing blockage; the adjusting assembly is used to adjust the rotation speed of the rotating assembly to solve problems such as casing sticking. The adjusting assembly includes an adjusting shaft and a fluid guide body. The fluid guide body is fixedly arranged in the cylinder body and is provided with a first through hole thereon. The adjusting shaft can move relative to the fluid guide body and is provided with a flow through hole thereon. The first through hole and the flow through hole can selectively overlap. When they do not overlap, the liquid flows through the rotating assembly at a preset flow rate, and the guide shoe part rotates and works at a preset working rotation speed. When resistance is encountered during casing reaming, the adjusting shaft of the adjusting assembly can be driven to move, so that the first through hole and the flow through hole overlap. At this time, the flow rate of the liquid flowing through the rotating assembly increases, and then the rotation speed of the rotating assembly is increased by increasing the rotation speed of the guide shoe part, so that the entire casing can smoothly pass through the stuck section and achieve the goal of smoothly lowering the casing to the predetermined depth. In addition, at least two different diameters of flow through holes are provided on the adjusting shaft. By overlapping the first through hole with different diameters of flow through holes, the flow rate of the liquid flowing through the rotating assembly is further changed, the rotation speed of the rotating assembly is adjusted, and then the rotation speed of the guide shoe part is adjusted, avoiding the situation of creating a new wellbore or torque jamming the casing during reaming due to too high a rotation speed. Description of the drawings

[0020] Figure 1 is a structural diagram of the rotary guide shoe provided by the present invention when the first through hole and the flow through hole are in a non-overlapping state;

[0021] Figure 2 is a structural diagram of the rotary guide shoe provided by the present invention when the first through hole and the flow through hole are in an overlapping state;

[0022] Figure 3 is a planar development view of the adjusting shaft of the rotary guide shoe provided by the present invention;

[0023] Figure 4 is a radial cross-sectional view of the adjusting shaft of the rotary guide shoe provided by the present invention.

[0024] In the figure:

[0025] 1. Cylinder body; 11. Liquid inlet hole; 2. Shoe guiding part; 21. Liquid outlet hole; 3. Adjusting shaft; 31. Guide groove; 311. Long groove; 312. Short groove; 313. Transition groove; 32. Flow-through hole; 33. Shearing pin; 4. Guide post; 5. Fluid guide; 51. First through hole; 52. Second through hole; 6. Elastic member; 7. Fluid guiding body; 8. Turbine shaft; 81. Third through hole; 82. Turbine; 9. Sealing member; 10. Driving cavity; 20. Inner driving cavity; 30. Outer driving cavity. Detailed implementation mode

[0026] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0027] In the description of the present invention, unless otherwise clearly defined 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 integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0030] Such as Figures 1-4As shown in the figure, the rotating guide shoe proposed by the present invention is connected to the front end of the casing. The rotating assembly can drive the guide shoe part 2 to rotate for reaming, avoiding the casing bottom scraping the wellbore or inserting into the wellbore, which may cause the casing to be blocked. At the same time, an adjustment assembly is provided to adjust the rotation speed of the rotating assembly to solve problems such as casing sticking. When the casing encounters resistance during reaming, the adjustment assembly can increase the flow rate of the liquid flowing through the rotating assembly, increasing the rotation speed of the rotating assembly, enabling the entire casing to smoothly pass through the stuck section, achieving the goal of smoothly lowering the casing to the predetermined depth. At the same time, the adjustment assembly can adjust the rotation speed of the rotating assembly to avoid the situation of creating a new wellbore or torque jamming the casing during reaming due to excessive rotation speed.

[0031] The rotating guide shoe includes a cylinder body 1 and a guide shoe part 2. One end of the cylinder body 1 is connected to the casing, and the other end is connected to the guide shoe part 2. When the liquid enters the rotating guide shoe, it first passes through the cylinder body 1 and then enters the guide shoe part 2 and finally flows out of the rotating guide shoe. An adjustment assembly and a rotating assembly are arranged in the cylinder body 1. The rotating assembly can drive the guide shoe part 2 to rotate for reaming, which can avoid the casing bottom scraping the wellbore or inserting into the wellbore, resulting in the casing being blocked.

[0032] Furthermore, the adjustment assembly includes an adjustment shaft 3 and a fluid guide 5. The fluid guide 5 is fixedly arranged in the cylinder body 1. A first through hole 51 is arranged on the fluid guide 5. The adjustment shaft 3 is movably arranged in the cylinder body 1, and a flow through hole 32 is arranged on the adjustment shaft 3. When the adjustment shaft 3 moves in the cylinder body 1, the first through hole 51 can selectively overlap with the flow through hole 32. Specifically, during normal reaming, the first through hole 51 does not overlap with the flow through hole 32, and the liquid flows through the rotating assembly at a preset flow rate, and the rotating assembly drives the guide shoe part 2 to rotate at a preset rotation speed. When reaming encounters resistance, the adjustment shaft 3 moves in the cylinder body 1, causing the first through hole 51 to overlap with the flow through hole 32. At this time, the flow rate of the liquid flowing through the rotating assembly increases, and then the rotating assembly drives the guide shoe part 2 to rotate at a higher rotation speed, achieving the goal of smoothly lowering the casing to the predetermined depth. In addition, multiple flow through holes 32 are arranged, and at least two of the flow through holes 32 have different diameters. When the adjustment shaft 3 moves, the first through hole 51 on the fluid guide 5 can selectively overlap with one of the flow through holes 32. Thus, by overlapping different flow through holes 32 with the first through hole 51, the flow rate of the liquid flowing through the rotating assembly is changed, the rotation speed of the rotating assembly is adjusted, and then the rotation speed of the guide shoe part 2 is adjusted, avoiding the situation of creating a new wellbore or torque jamming the casing during reaming due to excessive rotation speed. It should be noted that the diameter of the flow through hole 32 is not greater than the diameter of the first through hole 51, so as to ensure that flow through holes 32 with different diameters can play a role in changing the liquid flow rate. "Selectively overlap" means that the first through hole 51 overlaps with one of the flow through holes 32 with a certain diameter among multiple flow through holes 32.

[0033] Preferably, to ensure the accurate movement of the adjusting shaft 3 within the cylinder body 1, the adjusting assembly further includes a guide post 4. The guide post 4 is fixedly connected to the cylinder body 1. A guide groove 31 is provided on the adjusting shaft 3, and the guide post 4 is located within the guide groove 31, thereby being able to provide a guiding effect for the movement of the adjusting shaft 3 within the cylinder body 1.

[0034] Specifically, the guide groove 31 includes alternately arranged long grooves 311 and short grooves 312. The guide post 4 can be selectively placed within the long groove 311 or the short groove 312, thereby enabling the first through hole 51 to selectively overlap with the flow-through hole 32. The flow-through hole 32 is correspondingly arranged with the long groove 311. When the guide post 4 is placed at the bottom of the long groove 311, the first through hole 51 overlaps with the flow-through hole 32, and when the guide post 4 is placed in different long grooves 311, the first through hole 51 can overlap with flow-through holes 32 of different diameters. Specifically, during the normal reaming process, the guide post 4 is placed within the short groove 312, and the first through hole 51 does not overlap with the flow-through hole 32, and the liquid flows through the rotating assembly at a preset flow rate; when resistance is encountered during reaming, the guide post 4 moves from the short groove 312 to the long groove 311 and is located at the bottom of the groove. At the same time, the adjusting shaft 3 rotates and changes direction, and the first through hole 51 overlaps with the flow-through hole 32, and the flow rate of the liquid flowing through the rotating assembly increases, thereby enabling the rotating assembly to drive the guide shoe part 2 to rotate at a larger rotational speed.

[0035] Furthermore, to ensure the driving force for the upward movement of the adjusting shaft 3 and at the same time enable the adjusting shaft 3 to be stably placed at the bottom of the long groove 311 or the short groove 312, the adjusting assembly further includes an elastic member 6. The elastic member 6 is sleeved outside the fluid guide 5 and is connected to the adjusting shaft 3 at one end, and is used to drive the adjusting shaft 3 so that the adjusting shaft 3 has a tendency to make the bottom of the long groove 311 or the short groove 312 abut against the guide post 4. Preferably, the elastic member 6 can be a spring. At the same time, to ensure the driving force for the downward movement of the adjusting shaft 3, a driving cavity 10 is formed within the cylinder body 1. The driving cavity 10 is located between the fluid guide 5 and the adjusting shaft 3. The driving cavity 10 is connected to a hydraulic pump and can drive the adjusting shaft 3 so that the adjusting shaft 3 has a tendency to make the bottom of the long groove 311 or the short groove 312 disengage from abutting against the guide post 4. Preferably, a second through hole 52 is provided on the fluid guide 5, and the driving cavity 10 is connected to the hydraulic pump through the second through hole 52. That is, the force for the adjusting shaft 3 to compress the elastic member 6 comes from the pump pressure or the liquid. Therefore, there is no need to set other mechanical power equipment at the wellhead, and the rotating assembly is driven by hydraulic power, reducing the implementation limitations.

[0036] To ensure the rotation commutation when the adjusting shaft 3 moves up and down, and further to ensure that the guide post 4 can smoothly move alternately in the long slot 311 and the short slot 312, the adjusting shaft 3 is further provided with a transition slot 313. The transition slot 313 includes an inclined section, and the transition slot 313 is used to connect adjacent long slots 311 and short slots 312. When the guide post 4 moves out of the long slot 311, it enters the adjacent short slot 312 through the inclined section of the transition slot 313, ensuring that the guide post 4 can smoothly move alternately in the long slot 311 and the short slot 312, and thus ensuring the smoothness of the guiding. Of course, to further improve the fluency of the guiding, inclined sections can also be provided in the long slot 311 and the short slot 312, which is not limited here.

[0037] Further, the cylinder body 1 is provided with a liquid inlet hole 11, and the shoe guide part 2 is provided with a liquid outlet hole 21. The rotating assembly includes an inner driving cavity 20 and an outer driving cavity 30. The liquid inlet hole 11 is communicated with the inner driving cavity 20 and selectively communicated with the outer driving cavity 30. Both the inner driving cavity 20 and the outer driving cavity 30 are communicated with the liquid outlet hole 21. During the normal reaming process, the liquid inlet hole 11 is only communicated with the inner driving cavity 20, and the liquid flows into the inner driving cavity 20 through the liquid inlet hole 11. At this time, the rotating assembly drives the shoe guide part 2 to rotate at a preset speed. When resistance is encountered during reaming, the first through hole 51 is communicated with the flow hole 32. At this time, the liquid inlet hole 11 is communicated with both the inner driving cavity 20 and the outer driving cavity 30. The liquid flows into the liquid inlet hole 11. Part of the liquid passes through the inner driving cavity 20, and the other part of the liquid enters the outer driving cavity 30 through the first through hole 51 and the flow hole 32 and finally flows out from the liquid outlet hole 21. At this time, the flow rate of the liquid flowing through the rotating assembly increases, and the rotating assembly drives the shoe guide part 2 to rotate at a larger speed.

[0038] Further, the rotating assembly includes a turbine shaft 8. An outer driving cavity 30 is formed on the side of the turbine shaft 8 close to the cylinder body 1, and an inner driving cavity 20 is formed on the side of the turbine shaft 8 away from the cylinder body 1. A turbine 82 is provided on the turbine shaft 8, and the turbine 82 is placed in the outer driving cavity 30. When the liquid inlet hole 11 is only communicated with the inner driving cavity 20, the liquid enters the inner driving cavity 20 to make the turbine shaft 8 rotate. When the liquid inlet hole 11 is communicated with both the inner driving cavity 20 and the outer driving cavity 30, part of the liquid passes through the inner driving cavity 20 to make the turbine shaft 8 rotate, and the other part enters the outer driving cavity 30 and flows through the turbine 82 to form a swirl, thereby accelerating the rotation of the turbine shaft 8. At this time, the turbine shaft 8 is driven by the double driving forces of the inner driving cavity 20 and the outer driving cavity 30 and then rotates.

[0039] Further, a fluid guide 7 is also provided in the cylinder body 1. The fluid guide 7 is rotationally connected to the rotating assembly and separates the inner driving cavity 20 and the outer driving cavity 30. One end of the elastic member 6 abuts against the adjusting shaft 3, and the other end abuts against the fluid guide 7. The fluid guide 7 can, on the one hand, provide guidance for the liquid in the outer driving cavity 30, and on the other hand, provide a supporting force for the elastic member 6. Optionally, the fluid guide 7 is connected to the rotating assembly through a bearing.

[0040] At the end of the rotating assembly away from the fluid guiding body 7, a third through hole 81 is further provided, and the outer driving cavity 30 is communicated with the inner driving cavity 20 through the third through hole 81. Furthermore, when the first through hole 51 is communicated with the flow through hole 32, a part of the liquid passes through the inner driving cavity 20, and another part enters the outer driving cavity 30 through the first through hole 51 and the flow through hole 32, and then flows back to the inner driving cavity 20 through the third through hole 81, and finally flows out of the rotating shoe through the liquid outlet hole 21 on the shoe guiding part 2, preventing the liquid in the outer driving cavity 30 from being unable to be discharged and causing the rotating assembly to be unable to rotate.

[0041] To ensure that the adjusting shaft 3 moves during normal reaming, the adjusting shaft 3 can be fixed to the cylinder body 1 through a shear pin 33. When resistance is encountered during reaming, the shear pin 33 can be cut off by applying pump pressure or liquid through a hydraulic pump, and the adjusting shaft 3 can move relative to the cylinder body 1, thereby ensuring the working stability of the rotating shoe. To ensure the sealing performance between the cylinder body 1 and the shoe guiding part 2, a seal 9 is installed between the cylinder body 1 and the shoe guiding part 2.

[0042] The working process of this rotating shoe is as follows:

[0043] 1. During normal reaming, the guide post 4 is located at the bottom of the short groove 312, the first through hole 51 does not overlap with the flow through hole 32, and the liquid inlet hole 11 is only communicated with the inner driving cavity 20. The liquid flows into the inner driving cavity 20 through the liquid inlet hole 11 and flows out through the liquid outlet hole 21, thereby driving the rotating assembly to rotate. At this time, the rotating assembly drives the shoe guiding part 2 to rotate at a preset speed.

[0044] 2. When resistance is encountered during reaming, the adjusting assembly starts to work. First, pump pressure or liquid is applied to the driving cavity 10 through the second through hole 52. The downward force acting on the adjusting shaft 3 will increase until the shear pin 33 breaks. After the adjusting shaft 3 loses the axial constraint of the shear pin 33 and receives the driving force of the pump pressure or liquid, the adjusting shaft 3 starts to move downward. At the same time, the guide post 4 moves out of the short groove 312 and abuts against the inclined section of the transition groove 313, and finally abuts against the upper limit position of the transition groove 313. At this time, the guide post 4 corresponds to the next long groove 311, that is, the adjusting shaft 3 realizes the rotation commutation. When the guide post 4 moves towards the upper limit position of the transition groove 313, the elastic member 6 is continuously compressed; then when the guide post 4 abuts against the upper limit position of the transition groove 313, the pump is stopped, that is, the force acting on the adjusting shaft 3 is withdrawn. At this time, the elastic member 6 recovers its deformation and pushes the adjusting shaft 3 upward. At the same time, the guide post 4 moves out of the transition groove 313 and enters the long groove 311. When the guide post 4 abuts against the bottom of the long groove 311, the first through hole 51 overlaps with the flow through hole 32, and the flow rate of the liquid flowing through the rotating assembly increases. Thereby, the rotating assembly drives the shoe guiding part 2 to rotate at a larger speed, achieving the goal of smoothly lowering the casing to the predetermined depth.

[0045] In addition, the overflow holes 32 are arranged corresponding to the long slots 311, and the diameters of at least two overflow holes 32 are different. By applying pump pressure or liquid to the driving cavity 10 and then stopping the pump, the above process is cycled, so that the guide post 4 is placed in different long slots 311. When the guide post 4 is placed in different long slots 311, the first through hole 51 can overlap with the overflow holes 32 of different diameters, thereby changing the flow rate of the liquid flowing through the rotating assembly, adjusting the rotation speed of the rotating assembly, and then adjusting the rotation speed of the shoe guiding part 2. Specifically, when the hydraulic pump stops pumping, the guide post 4 is placed at the bottom of a certain long slot 311, and then pump pressure or liquid is applied to the driving cavity 10 again through the second through hole 52. After receiving the driving force of the pump pressure or liquid, the adjusting shaft 3 starts to move downward. At the same time, the guide post 4 moves out of the long slot 311 and abuts against the inclined section of the transition slot 313, and finally abuts against the upper limit position of the transition slot 313. At this time, the guide post 4 corresponds to the next short slot 312, that is, the adjusting shaft 3 realizes the rotation commutation. When the guide post 4 abuts against the upper limit position of the transition slot 313, stop pumping, that is, cancel the acting force on the adjusting shaft 3. At this time, the elastic member 6 resumes deformation and pushes the adjusting shaft 3 upward. At the same time, the guide post 4 moves out of the transition slot 313 and enters the short slot 312. Then repeat the above operation again to make the guide post 4 move out of the short slot 312 and enter the next long slot 311, thereby completing the placement of the guide post 4 in different long slots 311, and making the first through hole 51 overlap with the overflow holes 32 of different diameters.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A rotary guide shoe, connected to a casing, characterized in that, Comprising: A cylinder body (1) and a guide shoe part (2), one end of the cylinder body (1) is connected to the casing, and the other end is connected to the guide shoe part (2). An adjusting assembly and a rotating assembly are arranged in the cylinder body (1). When the liquid flows through the rotating assembly, the rotating assembly can drive the guide shoe part (2) to rotate; The adjusting assembly includes an adjusting shaft (3) and a fluid guide body (5). The fluid guide body (5) is fixedly arranged in the cylinder body (1). A first through hole (51) is arranged on the fluid guide body (5). The adjusting shaft (3) is movably arranged in the cylinder body (1). A flow-through hole (32) is arranged on the adjusting shaft (3). The first through hole (51) can selectively overlap with the flow-through hole (32) to change the flow rate of the liquid flowing through the rotating assembly; A plurality of flow-through holes (32) are arranged. The diameters of at least two flow-through holes (32) are different, and the diameter of the flow-through hole (32) is not greater than the diameter of the first through hole (51). The first through hole (51) selectively overlaps with the flow-through hole (32).

2. The rotary guide shoe according to claim 1, wherein, The adjusting assembly further includes a guide post (4). The guide post (4) is fixedly connected to the cylinder body (1). A guide groove (31) is arranged on the adjusting shaft (3). The guide post (4) is located in the guide groove (31) to provide guidance for the movement of the adjusting shaft (3).

3. The rotary guide shoe according to claim 2, characterized in that, The guide groove (31) includes alternately arranged long grooves (311) and short grooves (312). The flow-through holes (32) are arranged corresponding to the long grooves (311). The guide post (4) can be placed in the long groove (311) or the short groove (312) so that the first through hole (51) selectively overlaps with the flow-through hole (32). When the guide post (4) is placed in different long grooves (311), the first through hole (51) can overlap with flow-through holes (32) of different diameters.

4. The rotary guide shoe according to claim 3, characterized in that, The adjusting assembly further includes an elastic member (6). One end of the elastic member (6) is connected to the adjusting shaft (3) and is used to drive the adjusting shaft (3) so that the adjusting shaft (3) has a tendency to make the bottom of the long groove (311) or the short groove (312) abut against the guide post (4).

5. The rotary guide shoe according to claim 3, characterized in that, On one side of the adjusting shaft (3) away from the bottoms of the long groove (311) and the short groove (312), a transition groove (313) is further arranged. The transition groove (313) includes an inclined section. The transition groove (313) is used to communicate adjacent long grooves (311) and short grooves (312).

6. The rotary guide shoe according to claim 3, characterized in that, A driving cavity (10) is formed in the cylinder body (1). The driving cavity (10) is connected to a hydraulic pump and is used to drive the adjusting shaft (3) to move so that the adjusting shaft (3) has a tendency to make the bottom of the long groove (311) or the short groove (312) disengage from abutting against the guide post (4).

7. The rotary guide shoe according to claim 1, wherein The cylinder body (1) is provided with a liquid inlet hole (11), the guide shoe part (2) is provided with a liquid outlet hole (21), the rotating assembly includes an inner drive cavity (20) and an outer drive cavity (30), both the inner drive cavity (20) and the outer drive cavity (30) are communicated with the liquid outlet hole (21), the liquid inlet hole (11) is communicated with the inner drive cavity (20), and when the through-flow hole (32) is communicated with the first through-hole (51), the liquid inlet hole (11) is communicated with both the inner drive cavity (20) and the outer drive cavity (30).

8. The rotary guide shoe according to claim 7, characterized in that, A flow guide body (7) is further arranged in the cylinder body (1), the flow guide body (7) is rotatably connected with the rotating assembly and separates the inner drive cavity (20) from the outer drive cavity (30).

9. The rotary guide shoe according to claim 8, characterized in that, A third through-hole (81) is arranged at one end of the rotating assembly far away from the flow guide body (7), and the outer drive cavity (30) is communicated with the liquid outlet hole (21) through the third through-hole (81).

10. The rotary guide shoe according to any one of claims 1-9, characterized in that, The adjusting shaft (3) is fixed to the cylinder body (1) by a shear pin (33), and when the shear pin (33) breaks, the adjusting shaft (3) can move relative to the cylinder body (1).

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