A rotary drilling apparatus

Abstract

The present application relates to the technical field of petroleum drilling underground instrument, and more particularly to a rotary drilling device, which comprises an upper short circuit, a top end of the upper short circuit is provided with a snap spring and a filter screen, an outer side of a lower end of the upper short circuit is sleeved with an outer shell, a bottom end of the upper short circuit is connected with an upper piston body, a bottom end of the upper piston body is connected with a rotary piston body, a lower end of the rotary piston body is connected with a convex shaft, a flow channel regulator is arranged between the rotary piston body and the convex shaft, an outer side of the convex shaft is sleeved with a lower short circuit, a top end of the lower short circuit is provided with a disc spring group, a top end of the disc spring group is provided with a threaded ring, a top end of the threaded ring is connected with the rotary piston body, a lower end of the lower short circuit is provided with a fixed ring and a wear-resistant ring, a bottom end of the fixed ring is the wear-resistant ring, a plurality of diamond composite pieces are arranged on the wear-resistant ring, an inner part of the fixed ring is the convex shaft, the convex shaft is connected with the outer shell, and a tail end of the convex shaft is inserted into a drill bit. The device provided by the present application can apply impact force to the rotary drill bit in a rotating state, without consuming the energy of drilling fluid, and can improve the rock breaking efficiency and the mechanical drilling speed.

Description

Technical Field

[0001] This invention relates to the technical field of underground instruments for oil drilling, and more particularly to a rotary drilling device. Background Technology

[0002] As exploration and development continue to deepen, domestic oil and gas drilling is gradually moving towards deeper and ultra-deeper layers. However, as the well depth increases, the rock at the bottom of the well becomes harder and more abrasive, resulting in a low overall mechanical drilling rate and a long drilling cycle, which seriously affects the timeliness of oil and gas extraction.

[0003] In recent years, with the continuous advancement of drilling technology, significant progress has been made in increasing drilling speed and efficiency through the use of high-performance drilling pumps to improve drilling fluid displacement and drill bit pressure drop. However, the current capacity of existing drilling pump equipment does not allow for further increases in drilling fluid displacement. Therefore, to address these shortcomings, a rotary drilling device has been proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a rotary drilling device to overcome the defect in the prior art where, after the drilling circulation pressure reaches the pressure limit of the drilling pump, the drilling pump equipment capacity does not allow for increasing the drilling speed by increasing the drilling fluid discharge or increasing the water pressure drop of the drill bit.

[0005] To achieve the above objectives, the present invention provides a rotary drilling apparatus, comprising: The upper short connector has a retaining ring and a filter screen installed at its top. A housing is fitted around the lower end of the upper short connector. An upper piston body is connected to the bottom of the upper short connector. A rotating piston body is connected to the bottom of the upper piston body. A cam shaft is connected to the lower end of the rotating piston body. A flow channel regulator is installed between the rotating piston body and the cam shaft. A lower short connector is fitted around the outer side of the cam shaft. A disc spring assembly is installed at the top of the lower short connector. A threaded ring is installed at the top of the disc spring assembly. The top of the threaded ring is connected to the rotating piston body. A fixing ring and a wear-resistant ring are installed at the lower end of the lower short connector. The wear-resistant ring is located at the bottom of the fixing ring. Multiple diamond composite plates are installed on the wear-resistant ring. The cam shaft is located inside the fixing ring. The cam shaft is connected to the housing through multiple second fixing bolts. A drill bit is inserted into the tail end of the cam shaft. During drilling, impurities in the drilling fluid are isolated by a filter screen. The flow regulator adjusts the flow rate by changing the inner bore. The rotating piston controls the flow position and direction of the drilling fluid by rotating. The rotating piston connects to or disconnects from the threaded ring by rotating. The threaded ring transfers the rotational energy of the rotating piston to the disc spring assembly. The disc spring assembly stores energy and transfers it to the lower shorting. The lower shorting drives the cam shaft to push the drill bit in reciprocating motion.

[0006] Preferably, the bottom end of the upper short connector is provided with a slot, and the top end of the upper short connector is fitted with a retaining spring and a filter screen through the slot, with the bottom end of the retaining spring serving as the filter screen; the bottom end of the upper short connector is provided with a sealing ring groove, and a sealing ring is fitted through the sealing ring groove at the bottom end of the upper short connector, with the bottom end of the upper short connector and the top end of the upper piston body sealed by the sealing ring; the bottom end of the upper short connector is provided with multiple bolt holes, which are located outside the sealing ring groove, and a first fixing bolt is fitted through the bolt holes at the bottom end of the upper short connector; the top end of the upper piston body is provided with multiple screw holes, and the tail end of the first fixing bolt is inserted into the screw holes.

[0007] Preferably, the filter screen is provided with multiple filter holes, the diameter of which ranges from 3mm to 6mm, and the filter screen isolates impurities in the drilling fluid through the multiple filter holes.

[0008] Preferably, at least two metal sealing rings are fitted onto the outer side of the upper end of the rotating piston body, and the rotating piston body and the upper piston body are sealed by the metal sealing rings.

[0009] Preferably, the middle section of the rotating piston body is provided with multiple vertical grooves, the number of which is 4-8. The rotating piston body uses the vertical grooves to direct the drilling fluid from the hollow channel to the outer wall.

[0010] Preferably, the lower end of the rotating piston body is provided with a plurality of oblique holes, the angle of the oblique holes being 30°-60°, and the number of oblique holes being 4-8. The rotating piston body converts the axial motion of the drilling fluid into circumferential motion through the oblique holes.

[0011] Preferably, the bottom end of the rotating piston body is provided with a plurality of protrusions, the number of which is 10-14, and the rotating piston body is connected to a threaded ring through the protrusions.

[0012] Preferably, the outer side of the top end of the lower short joint is provided with an external thread, the lower short joint is connected to a threaded ring through the external thread, the threaded ring is provided with multiple circular grooves, the threaded ring is connected to a protrusion through the circular grooves, and the number of circular grooves is adapted to the number of protrusions; the middle section of the lower short joint is provided with multiple long grooves, the lower short joint is installed with a convex shaft through the long grooves; the bottom end of the lower short joint is provided with a step, the lower short joint is installed with a fixing ring and a wear-resistant ring through the step.

[0013] Preferably, the fixing ring is a combined structure, comprising a first ring and a second ring, with the top end of the first ring being the second ring. The first ring and the second ring are an integral structure, with the inner diameter of the first ring being larger than the outer diameter of the second ring. The outer wall of the second ring is inserted into the inner wall of the lower short connector, and a convex shaft is installed on the inner wall of the second ring. The top end of the first ring is connected to the lower short connector, and the bottom end of the first ring has multiple threaded holes. The bottom end of the first ring is connected to a wear-resistant ring through the threaded holes. The top end of the wear-resistant ring is equipped with multiple diamond composite plates, the number of which is 14-18. The bottom end of the wear-resistant ring is a step of the lower short connector.

[0014] Preferably, the inner diameter of the flow regulator is in the range of 10mm-20mm.

[0015] The present invention has the following beneficial effects: This invention provides a rotary drilling device that can mechanically apply a certain frequency of impact force to the rotary drill bit while it is rotating, without consuming drilling fluid energy. This can significantly improve rock breaking efficiency and thus increase the mechanical drilling speed. The size of the inner orifice of the flow regulator can be adjusted according to different well depths and well types to achieve different frequency changes, making it better match the formation and enabling drilling operations at high efficiency. It can also effectively alleviate the problem of slow mechanical drilling speed of drill strings in complex well structures. This invention has significant practical implications for improving drilling speed and reducing drilling costs in deep wells, ultra-deep wells, and complex well structures. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the rotary drilling apparatus according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the filter screen according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the piston body in an embodiment of the present invention; Figure 4 This is a front view of the rotating piston body according to an embodiment of the present invention; Figure 5 This is a cross-sectional view along line A-A' of the rotating piston body according to an embodiment of the present invention; Figure 6 This is a side view of the rotating piston body according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the wear-resistant ring according to an embodiment of the present invention; Figure 8 This is a schematic diagram of a short circuit in an embodiment of the present invention; Figure 9 This is a schematic diagram of the fixing ring according to an embodiment of the present invention; Figure 10 This is a schematic diagram of a threaded ring according to an embodiment of the present invention.

[0017] Legend: 1-Snap ring; 2-Filter screen; 3-Upper short connector; 4-Sealing ring; 5-First fixing bolt; 6-Upper piston body; 7-Outer shell; 8-Metal sealing ring; 9-Rotating piston body; 10-Flow channel regulator; 11-Threaded ring; 12-Disc spring assembly; 13-Cam shaft; 14-Lower short connector; 15-Fixing ring; 16-Wear-resistant ring; 17-Diamond composite sheet; 18-Second fixing bolt; 19-Drill bit. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Figure 1 This is a cross-sectional view of the rotary drilling apparatus according to an embodiment of the present invention, as shown below. Figure 1 As shown, the present invention provides a rotary drilling apparatus, comprising: The upper shorting connector 3 has a retaining ring 1 and a filter screen 2 installed at its top. A housing 7 is sleeved on the outer side of the lower end of the upper shorting connector 3. An upper piston body 6 is connected to the bottom end of the upper shorting connector 3. A rotating piston body 9 is connected to the bottom end of the upper piston body 6. A cam shaft 13 is connected to the lower end of the rotating piston body 9. A flow channel adjuster 10 is installed between the rotating piston body 9 and the cam shaft 13. A lower shorting connector 14 is sleeved on the outer side of the cam shaft 13. A disc spring assembly 1 is installed at the top end of the lower shorting connector 14. 2. A threaded ring 11 is installed at the top of the disc spring assembly 12. The top of the threaded ring 11 is connected to the rotating piston body 9. A fixing ring 15 and a wear-resistant ring 16 are installed at the lower end of the lower short connector 14. The bottom end of the fixing ring 15 is the wear-resistant ring 16. Multiple diamond composite sheets 17 are installed on the wear-resistant ring 16. The inside of the fixing ring 15 is a convex shaft 13. The convex shaft 13 is connected to the outer shell 7 by multiple second fixing bolts 18. The tail end of the convex shaft 13 is inserted into the drill bit 19.

[0020] In practical applications, during drilling, impurities in the drilling fluid are isolated by the filter screen 2, the flow regulator 10 adjusts the flow rate by changing the inner hole, the rotating piston body 9 controls the flow position and direction of the drilling fluid by rotating, the rotating piston body 9 connects to or disconnects from the threaded ring 11 by rotating, the threaded ring 11 transmits the rotational energy of the rotating piston body 9 to the disc spring assembly 12, the disc spring assembly 12 stores energy and transmits the energy to the lower shorting joint 14, the lower shorting joint 14 drives the cam shaft 13 to push the drill bit 19 to reciprocate.

[0021] In this drilling device, the bottom end of the upper short connector 3 is provided with a groove, and the top end of the upper short connector 3 is installed with a retaining spring 1 and a filter screen 2 through the groove. The bottom end of the retaining spring 1 is the filter screen 2. The bottom end of the upper short connector 3 is provided with a sealing ring groove, and the bottom end of the upper short connector 3 is installed with a sealing ring 4 through the sealing ring groove. The bottom end of the upper short connector 3 and the top end of the upper piston body 6 are sealed by the sealing ring 4. The bottom end of the upper short connector 3 is provided with multiple bolt holes, which are located outside the sealing ring groove. The bottom end of the upper short connector 3 is installed with a first fixing bolt 5 through the bolt holes. The top end of the upper piston body 6 is provided with multiple screw holes, and the tail end of the first fixing bolt 5 is inserted into the screw holes.

[0022] It is important to note that, such as Figure 2 As shown, filter screen 2 has multiple filter holes with a diameter ranging from 3mm to 6mm. Filter screen 2 isolates impurities in drilling fluid through these multiple filter holes.

[0023] In practical applications, such as Figures 3 to 6 As shown, at least two metal sealing rings 8 are fitted onto the outer side of the upper end of the rotating piston body 9, and the rotating piston body 9 and the upper piston body 6 are sealed by the metal sealing rings 8. The metal sealing rings 8 are not limited to metal materials.

[0024] In this drilling device, the middle section of the rotary piston body 9 is provided with multiple vertical grooves, the number of which is 4-8. The rotary piston body 9 uses the vertical grooves to direct the drilling fluid from the hollow flow channel to the outer wall. The lower end of the rotary piston body 9 is provided with multiple inclined holes, the angle of which is 30°-60°, the number of which is 4-8. The rotary piston body 9 uses the inclined holes to convert the axial movement of the drilling fluid into circumferential movement. The bottom end of the rotary piston body 9 is provided with multiple protrusions, the number of which is 10-14. The rotary piston body 9 is connected to the threaded ring 11 through the protrusions.

[0025] In practical applications, such as Figure 8 and Figure 10 As shown, the outer side of the top of the lower short connector 14 is provided with an external thread, and the lower short connector 14 is connected to the threaded ring 11 through the external thread. The threaded ring 11 is provided with multiple circular grooves, and the threaded ring 11 is connected to the protrusions through the circular grooves. The number of circular grooves is adapted to the number of protrusions. The middle section of the lower short connector 14 is provided with multiple long grooves, and the lower short connector 14 is installed with the convex shaft 13 through the long grooves. The bottom end of the lower short connector 14 is provided with a step, and the lower short connector 14 is installed with the fixing ring 15 and the wear-resistant ring 16 through the step.

[0026] In this drilling rig, such as Figure 7 and Figure 9As shown, the fixing ring 15 is a combined structure, including a first ring and a second ring. The top of the first ring is the second ring, and the first and second rings are an integral structure. The inner diameter of the first ring is larger than the outer diameter of the second ring. The outer wall of the second ring is inserted into the inner wall of the lower short connector 14. A convex shaft 13 is installed on the inner wall of the second ring. The top of the first ring is connected to the lower short connector 14. The bottom of the first ring is provided with multiple threaded holes. The bottom of the first ring is connected to the wear-resistant ring 16 through the threaded holes. Multiple diamond composite plates 17 are installed on the top of the wear-resistant ring 16. The number of diamond composite plates 17 is 14-18. The bottom of the wear-resistant ring 16 is the step of the lower short connector 14.

[0027] It should be noted that the inner diameter of the flow regulator 10 ranges from 10mm to 20mm. Additionally, the lower shorting connector 14 has 4-8 long slots, the disc spring assembly 12 is a combination of multiple disc springs, with a minimum of 10 disc springs, and the first fixing bolt 5 and the second fixing bolt 18 are compatible, with 4-8 first fixing bolts and 4-8 second fixing bolts.

[0028] In practical applications, the upper short connector 3 is made of 4145H material to ensure the strength of the device. The filter screen is designed with multiple filter holes to filter large particles in the drilling fluid and prevent blockage of the internal flow channel. The upper part of the rotating piston body 9 is designed with a metal sealing structure to achieve dynamic sealing with the upper piston body 6. The middle of the rotating piston body is designed with multiple vertical grooves to realize the transfer of fluid from the hollow flow channel to the outer wall. The lower part of the rotating piston body is designed with multiple inclined holes to realize the conversion of the axial motion of the fluid into circumferential motion. The lower end of the rotating piston body is designed with multiple protrusions to convert the kinetic energy of the fluid into mechanical energy to drive the drill bit 19 to reciprocate. The wear-resistant ring 16 is designed with multiple diamond composite plates to improve the wear resistance of the device.

[0029] This invention provides a rotary drilling device that addresses the problem of increasing drilling speed by increasing drilling flow rate or drill bit pressure drop after the drilling circulation pressure reaches the drilling pump's pressure limit. The working principle of this rotary drilling device is described in detail below: In this embodiment, the bottom end of the upper short connector 3 is provided with a slot, and the top end of the upper short connector 3 is installed with a retaining spring 1 and a filter screen 2 through the slot. The bottom end of the retaining spring 1 is the filter screen 2. The bottom end of the upper short connector 3 is provided with a sealing ring groove, and a sealing ring 4 is installed at the bottom end of the upper short connector 3 through the sealing ring groove. The bottom end of the upper short connector 3 and the top end of the upper piston body 6 are sealed by the sealing ring 4. The upper short connector 3 is connected to the upper piston body 6 by four first fixing bolts 5. The bottom end of the upper piston body 6 is connected to the rotating piston body 9. Two metal sealing rings 8 are fitted on the outer side of the upper end of the rotating piston body 9. The rotating piston body 9 and the upper piston body 6 are sealed by the metal sealing rings 8. The middle section of the rotating piston body 9 is provided with four vertical grooves, and the lower end of the rotating piston body 9 is provided with four oblique holes with an angle range of 30°. The bottom end of the rotating piston body 9 is provided with 12 protrusions, and the rotating piston body 9 is connected to the upper piston body 6 through the protrusions. A threaded ring 11 is connected to the top of a lower short connector 14 via a thread. The threaded ring 11 has 12 circular grooves, the inner diameter of which matches the outer diameter of the protrusion. The threaded ring 11 is connected to the top of a lower short connector 14 via a thread. The bottom of the threaded ring 11 is a disc spring assembly 12, which is sleeved on the top of the lower short connector 14. The middle section of the lower short connector 14 has 6 long grooves, through which a cam shaft 13 is installed. The lower end of the rotating piston body 9 is connected to the cam shaft 13. A flow channel adjuster 10 is installed between the rotating piston body 9 and the cam shaft 13. The bottom of the lower short connector 14 has a step, through which a fixing ring 15 and a wear-resistant ring 16 are installed. Sixteen diamond composite plates 17 are installed on the wear-resistant ring 16. The inside of the fixing ring 15 is the cam shaft 13, which is connected to the outer shell 7 via four second fixing bolts 18. The tail end of the cam shaft 13 is inserted into a drill bit 19.

[0030] Downhole, this embodiment uses a top drive or rotary table to drive rotary drilling. When the drilling fluid flows from top to bottom into this embodiment, large particles of impurities in the drilling fluid are separated when passing through the filter screen 2. The seal between the rotating piston body 9 and the upper piston body 6 is a metal seal, which can ensure sealing when the rotating piston body 9 moves axially and circumferentially. When drilling fluid flows through the rotating piston body 9, it flows to the outer wall through the four grooves on the outer surface of the rotating piston body 9, and then flows out from the lower end through the four φ12 inclined holes at the bottom of the rotating piston body 9. Because of the presence of the inclined holes, the rotating piston body 9 is subjected to a lateral force, which drives the rotating piston body 9 to rotate circumferentially. The lower part of the rotating piston body 9 is designed with 12 protrusions, and the upper end of the threaded ring 11 that cooperates with it is designed with 12 grooves. When the protrusions at the bottom of the rotating piston body 9 enter and leave the circular grooves of the threaded ring 11 as they rotate, the threaded ring 11 transmits the impact energy to the disc spring assembly 12. The disc spring assembly 12, composed of 10 disc springs, stores energy. When the energy is stored to the maximum, it pushes the short circuit 14 and the drill bit 19 to impact the rock at the bottom of the well, thus realizing rock breaking in one impact. This embodiment is designed with 12 protrusions, which can achieve 12 impacts on the rock in one rotation cycle. Compared with the previous tools that could only impact 4 times in one cycle, the impact efficiency is increased by 3 times.

[0031] In practical applications, if the rock-breaking efficiency is too low during use, the impact force can be adjusted by changing the size of the inner hole of the flow channel regulator 10. The inner hole of the flow channel regulator 10 is designed with multiple adjustable sizes from φ10mm to φ20mm to meet the construction needs of different wells.

[0032] This invention provides a rotary drilling device that can mechanically apply a certain frequency of impact force to the rotary drill bit while it is rotating, without consuming drilling fluid energy. This can significantly improve rock breaking efficiency and thus increase the mechanical drilling speed. The size of the inner orifice of the flow regulator can be adjusted according to different well depths and well types to achieve different frequency changes, making it better match the formation and enabling drilling operations at high efficiency. It can also effectively alleviate the problem of slow mechanical drilling speed of drill strings in complex well structures. This invention has significant practical implications for improving drilling speed and reducing drilling costs in deep wells, ultra-deep wells, and complex well structures.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotary drilling apparatus, characterized in that, include: The upper short connector (3) is fitted with a retaining ring (1) and a filter screen (2) at its top end. The outer side of the lower end of the upper short connector (3) is fitted with a housing (7). The bottom end of the upper short connector (1) is connected to an upper piston body (6). The bottom end of the upper piston body (6) is connected to a rotating piston body (9). The lower end of the rotating piston body (9) is connected to a cam shaft (13). A flow channel adjuster (10) is installed between the rotating piston body (9) and the cam shaft (13). The outer side of the cam shaft (13) is fitted with a lower short connector (14). The top end of the lower short connector (14) is fitted with a disc spring assembly (1). 2) A threaded ring (11) is installed at the top of the disc spring assembly (12). The top of the threaded ring (11) is connected to the rotating piston body (9). A fixing ring (15) and a wear-resistant ring (16) are installed at the lower end of the lower short connector (14). The bottom end of the fixing ring (15) is the wear-resistant ring (16). Multiple diamond composite plates (17) are installed on the wear-resistant ring (16). The inside of the fixing ring (15) is a cam shaft (13). The cam shaft (13) is connected to the outer shell (7) through multiple second fixing bolts (18). The tail end of the cam shaft (13) is inserted into the drill bit (19). During drilling, impurities in the drilling fluid are isolated by a filter screen (2). The flow regulator (10) adjusts the flow rate by changing the inner hole. The rotating piston body (9) controls the flow position and direction of the drilling fluid by rotating. The rotating piston body (9) connects to or disconnects from the threaded ring (11) by rotating. The threaded ring (11) transmits the rotational energy of the rotating piston body (9) to the disc spring assembly (12). The disc spring assembly (12) stores energy and transmits the energy to the lower shorting joint (14). The lower shorting joint (14) drives the cam shaft (13) to push the drill bit (19) to reciprocate.

2. The rotary drilling apparatus according to claim 1, characterized in that, The bottom end of the upper short connector (3) is provided with a slot, and the top end of the upper short connector (3) is installed with a retaining ring (1) and a filter screen (2) through the slot. The bottom end of the retaining ring (1) is the filter screen (2). The bottom end of the upper short connector (3) is provided with a sealing ring groove, and the bottom end of the upper short connector (3) is installed with a sealing ring (4) through the sealing ring groove. The bottom end of the upper short connector (3) and the top end of the upper piston body (6) are sealed by the sealing ring (4). The bottom end of the upper short connector (3) is provided with multiple bolt holes, and the bolt holes are located outside the sealing ring groove. The bottom end of the upper short connector (3) is installed with a first fixing bolt (5) through the bolt holes. The top end of the upper piston body (6) is provided with multiple screw holes, and the tail end of the first fixing bolt (5) is inserted into the screw hole.

3. The rotary drilling apparatus according to claim 2, characterized in that, The filter screen (2) is provided with multiple filter holes, the diameter of which ranges from 3mm to 6mm. The filter screen (2) isolates impurities in the drilling fluid through the multiple filter holes.

4. The rotary drilling apparatus according to claim 1, characterized in that, At least two metal sealing rings (8) are fitted on the outer side of the upper end of the rotating piston body (9), and the rotating piston body (9) and the upper piston body (6) are sealed by the metal sealing rings (8).

5. The rotary drilling apparatus according to claim 1, characterized in that, The middle section of the rotating piston body (9) is provided with multiple vertical grooves, the number of which is 4-8. The rotating piston body (9) uses the vertical grooves to direct the drilling fluid from the hollow channel to the outer wall.

6. The rotary drilling apparatus according to claim 1, characterized in that, The lower end of the rotating piston body (9) is provided with multiple inclined holes, the angle range of which is 30°-60°, and the number of inclined holes is 4-8. The rotating piston body (9) converts the axial movement of the drilling fluid into circumferential movement through the inclined holes.

7. The rotary drilling apparatus according to claim 1, characterized in that, The bottom end of the rotating piston body (9) is provided with a plurality of protrusions, the number of which is 10-14, and the rotating piston body (9) is connected to the threaded ring (11) through the protrusions.

8. The rotary drilling apparatus according to claim 7, characterized in that, The lower short connector (14) has an external thread on the outer side of its top end. The lower short connector (14) is connected to a threaded ring (11) through the external thread. The threaded ring (11) has multiple circular grooves. The threaded ring (11) is connected to a protrusion through the circular grooves. The number of circular grooves is adapted to the number of protrusions. The middle section of the lower short connector (14) has multiple long grooves. The lower short connector (14) is installed with a convex shaft (13) through the long grooves. The bottom end of the lower short connector (14) has a step. The lower short connector (14) is installed with a fixing ring (15) and a wear-resistant ring (16) through the step.

9. The rotary drilling apparatus according to claim 8, characterized in that, The fixing ring is a combined structure. The fixing ring (15) includes a first ring and a second ring. The top of the first ring is the second ring. The first ring and the second ring are an integrated structure. The inner diameter of the first ring is larger than the outer diameter of the second ring. The outer wall of the second ring is inserted into the inner wall of the lower short connector (14). A convex shaft (13) is installed on the inner wall of the second ring. The top of the first ring is connected to the lower short connector (14). The bottom of the first ring is provided with multiple threaded holes. The bottom of the first ring is connected to the wear-resistant ring (16) through the threaded holes. Multiple diamond composite plates (17) are installed on the top of the wear-resistant ring (16). The number of diamond composite plates (17) is 14-18. The bottom of the wear-resistant ring (16) is the step of the lower short connector (14).

10. The rotary drilling apparatus according to claim 1, characterized in that, The fixing ring is a combined structure, and the inner diameter of the flow regulator (10) is in the range of 10mm-20mm.

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