Geothermal drilling device and method of use

Abstract

The invention discloses a geothermal drilling device and a method of using the same, and relates to the technical field of geothermal drilling. The device comprises a base, a workbench, a lifting member, a driving member, a quick connector, a drill rod and a drill bit, which are used to realize the drilling action. An avoidance hole is opened in the middle of the base, a locking device is arranged on the periphery of the top of the avoidance hole, a pressure regulating sealing chamber is arranged in the locking device, and the pressure regulating sealing chamber is used to adjust the torque resistance value when the locking device locks the drill rod. A force unloading component is arranged on the inner side of the clamping surface of the locking device to rotate along its extension direction, and the pressure regulating sealing chamber is used to provide rotational torque resistance to the force unloading component. When the torque value of the drill rod rotating under the action of the driving member is greater than or equal to the torque resistance value set by the locking device, the force unloading component automatically rotates to unload the force, so as to avoid damage to the connecting thread or unstable connection caused by excessive or insufficient rotational torque of the drill rod. An auxiliary rod feeding device is also arranged on the side of the base, which is used to automatically transport and dock the drill rod, so as to improve the efficiency and safety of geothermal drilling operations.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal drilling, and in particular to a geothermal drilling device and a use method thereof. Background Art

[0002] Geothermal energy, as a clean and renewable energy, has broad prospects for development and application.

[0003] During the construction of large-scale geothermal drilling, as the drilling depth increases, the drill pipe needs to be spliced. Affected by the specifications of large-scale geothermal drilling drill pipes, the existing splicing methods mostly use lifting equipment to lift the drill pipe to be spliced ​​and connect it with the already spliced ​​drill pipe, and then multiple workers cooperate to use pneumatic wrenches to screw the drill pipe to complete the splicing of the drill pipe. Among them, the steps of splicing the drill pipe are relatively cumbersome and there are certain risks.

[0004] Therefore, it is necessary to provide a geothermal drilling device and a method of use to solve the problems mentioned in the above background technology. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a geothermal drilling device and a method of use, comprising a base, a middle portion of the base is provided with an avoidance hole, a workbench is provided above the base, and the base and the workbench are connected by a plurality of lifting members provided on the periphery;

[0006] A driving member is installed on the top of the workbench, a quick connector is installed on the output end of the driving member through the workbench, a drill rod is coaxially installed on the lower end of the quick connector, and a drill bit is installed on the lower end of the drill rod;

[0007] A locking device is symmetrically arranged on the central side of the top of the avoidance hole, and a pressure-adjusting sealing chamber is arranged in the locking device, and the pressure-adjusting sealing chamber is used to adjust the anti-torque value when the locking device locks the drill rod;

[0008] The clamping surface of the locking device is provided with a force unloading component that rotates along its extension direction, and the pressure regulating sealing chamber is used to provide rotational anti-torque force to the force unloading component. When the torque value of the drill rod rotating under the action of the driving member is greater than or equal to the anti-torque value set by the locking device, the force unloading component automatically rotates to unload the force, thereby preventing the drill rod from being damaged by excessive or insufficient rotational torque or causing unstable connection.

[0009] An auxiliary rod delivery device is also provided on the side of the base for automatically transporting and docking the drill rod.

[0010] Preferably, the locking device comprises: clamping blocks slidably arranged on both sides of the top of the avoidance hole, and the opposite end surfaces of the clamping blocks are provided with semicircular clamping surfaces;

[0011] Top plates are arranged at intervals on the opposite end faces of the clamping blocks, and the top plates are connected to the clamping blocks on the corresponding sides via telescopic members, and the telescopic members are used to drive the clamping blocks on both sides to clamp or loosen the drill rod;

[0012] Arc grooves are coaxially spaced apart from the clamping surface inside the clamping blocks on both sides, a connecting groove is formed in the middle of the side surface of the arc groove and penetrates the clamping surface, and the unloading assembly is installed at the arc groove and the connecting groove.

[0013] Preferably, the force unloading assembly includes: an arc-shaped limiting slider, the limiting slider sliding seal is arranged in the arc-shaped groove, an arc-shaped clamping plate is relatively rotatably arranged on the clamping surface, the clamping plate is connected to the limiting slider through a connecting block, and the connecting block is slidingly sealed and connected to the connecting groove.

[0014] Preferably, the arc groove is connected to the limit slider at either end along its extension direction through an elastic reset piece, and the other end of the arc groove together with the limit slider, the connecting block and the clamping plate constitute the pressure regulating sealing cavity, and a pressure sensor is arranged in the pressure regulating sealing cavity.

[0015] Preferably, two channels are provided around each clamp block and connected to the pressure regulating sealing cavity, and a pressure regulating valve and an air intake valve are respectively provided in the channels, and the air intake valve is connected to an external air pump;

[0016] Among them, gas is filled into the pressure regulating sealing chamber through the air inlet valve to an initial set air pressure, and then as the drill pipe is screwed, when the gas in the pressure regulating sealing chamber is compressed to a target set value, the pressure regulating valve performs buffering pressure relief, and at the same time, the unloading component performs unloading.

[0017] Preferably, a plug-in hole is provided in the middle of the facing side surfaces of the limiting sliding block and the clamping plate, and the connecting block is inserted into the plug-in hole.

[0018] Preferably, a flexible sealing layer is provided on both the insertion end of the connection block and the outer curved surface of the clamping plate.

[0019] Preferably, a plurality of guide grooves are provided on the top of the base in parallel with the telescopic member, and a plurality of guide blocks are correspondingly provided on the bottom of the clamping block, and the guide blocks are slidably arranged in the guide grooves.

[0020] Preferably, a ring seat is coaxially installed at the bottom of the base and the avoidance hole, a water inlet pipe is arranged on the circumferential side of the ring seat, a plurality of nozzles are evenly distributed on the inner side of the ring seat along the circumferential direction and inclined downward, and the nozzles are connected with the water inlet pipe through the internal flow channel of the ring seat.

[0021] A method for using a geothermal drilling device includes:

[0022] S1. When the drill pipe needs to be connected, the top of the drill pipe at the top of the connected part is locked by a locking device;

[0023] S2. Setting the torque value of the locking device according to the torque value required for the drill pipe connection;

[0024] S3, loosen the quick connector and raise the quick connector by at least the length of the drill pipe through the lifting member;

[0025] S4, using the auxiliary rod delivery equipment to connect the drill rod to be connected with the quick connector;

[0026] S5, control the lifting member and the driving member to drive the drill rod to be connected to move downward at a uniform speed and rotate. When the driving member drives the drill rod to rotate to the torque value required for locking, the force unloading assembly automatically rotates to unload the force, completing the installation of the drill rod to be connected;

[0027] S6. When the drill rod needs to be disassembled, the lifting member is controlled to completely release the top drill rod, and then the locking device clamps and locks the upper part of the second drill rod from top to bottom;

[0028] S7, controlling the driving member to drive the top drill rod to rotate in the opposite direction, so as to separate the top drill rod from the drill rod below it;

[0029] S8. Clamp the top drill rod using the auxiliary rod delivery device and control the quick connector to release the drill rod to achieve the removal of the drill rod.

[0030] S9. If further disassembly is required, the quick connector is controlled to move downward to connect with the second drill rod from top to bottom, and S6-S8 are repeated to achieve continuous disassembly of the drill rod.

[0031] Compared with the prior art, the present invention provides a geothermal drilling device and a method of use, which have the following beneficial effects:

[0032] In the present invention, by arranging a driving member, a quick connector, an auxiliary rod feeding device and a locking device, etc., the drill rod is clamped and fixed by the clamping device, and then the drill rod is driven by the driving member to rotate forward and reversely, so as to realize automatic connection or disassembly of the drill rod by the drilling device, thereby improving the connection and replacement efficiency of the drill rod; and a pressure regulating sealing chamber and a force unloading component are arranged in the locking device, and the torque resistance value when the locking device is locked is set, so as to ensure that when the drill rod is connected or disassembled, there will be no situation where the torque is too large to damage the thread, or the torque is too small to make the connection loose, thereby improving the connection quality of the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of a geothermal drilling device;

[0034] Figure 2 It is a schematic diagram of a locking cross-sectional structure of a locking device of a geothermal drilling device;

[0035] Figure 3 It is a schematic diagram of the cross-sectional structure of a clamp block of a geothermal drilling device;

[0036] Figure 4 It is a schematic diagram of the connection structure of a connection block of a geothermal drilling device;

[0037] Figure 5 A schematic diagram of a ring seat structure of a geothermal drilling device;

[0038] Figure 6 A schematic diagram of a loosening structure of a locking device of a geothermal drilling device;

[0039] In the figure: 1. base; 2. workbench; 3. lifting member; 4. driving member; 5. quick connector; 6. drill rod; 7. drill bit; 8. locking device; 9. avoidance hole; 10. clamping block; 11. top plate; 12. telescopic member; 13. arc groove; 14. connecting groove; 15. limit slider; 16. connecting block; 17. clamping plate; 18. pressure regulating valve; 19. air inlet valve; 20. flexible sealing layer; 21. guide groove; 22. elastic reset member; 23. ring seat; 24. nozzle; 25. water inlet pipe. DETAILED DESCRIPTION

[0040] See also Figure 1-6 The present invention provides a geothermal drilling device and a method for using the same, comprising: a base 1, a middle portion of the base 1 is provided with an avoidance hole 9, a workbench 2 is provided above the base 1, and the base 1 and the workbench 2 are connected via a plurality of lifting members 3 provided on the periphery;

[0041] A driving member 4 is installed on the top of the workbench 2, and a quick connector 5 is installed on the output end of the driving member 4 through the workbench 2. A drill rod 6 is coaxially installed on the lower end of the quick connector 5, and a drill bit 7 is installed on the lower end of the drill rod 6.

[0042] The top circumference of the avoidance hole 9 is centrally and symmetrically provided with a locking device 8, and a pressure-adjusting sealing chamber is provided in the locking device 8, and the pressure-adjusting sealing chamber is used to adjust the anti-torque value when the locking device 8 locks the drill rod 6;

[0043] The clamping surface of the locking device 8 is provided with a force unloading component that rotates along its extension direction. The pressure regulating sealing chamber is used to provide rotational anti-torque force to the force unloading component. When the torque value of the drill rod 6 rotating under the action of the driving member 4 is greater than or equal to the anti-torque value set by the locking device 8, the force unloading component automatically rotates to unload the force, thereby preventing the drill rod 6 from being damaged by excessive or insufficient rotational torque or causing unstable connection.

[0044] The side of the base 1 is also provided with an auxiliary rod delivery device for automatically transporting and docking the drill rod 6 .

[0045] Specifically, the quick connector 5 is a mechanical quick connector or a hydraulic quick connector, which is used to realize the rapid installation and removal of the drill pipe 6 and the driving member 4. The driving member 4 is a drilling motor, and the lifting member 3 is a servo telescopic rod.

[0046] The auxiliary rod feeding device at least includes a guide rail mounting plate, a guide rail assembly, a manipulator assembly and a drill rod box. The guide rail mounting plate is installed on one side of the base 1, and a guide rail assembly is installed on the guide rail mounting plate. A manipulator assembly is provided on the guide rail assembly for clamping the drill rod 6. The drill rod box is used to place the drill rod 6. When in use, the manipulator assembly is driven by the guide rail assembly to complete the work of raising and lowering the drill rod 6. Through the precise operation of the manipulator, the automatic grasping, transportation and coaxial docking of the drill rod 6 are realized.

[0047] It needs to be explained that when the drill rod 6 is connected, the torque value required for locking it is calculated according to the specification of the connecting thread of the drill rod 6, and then the anti-torque value of the pressure-regulating sealing chamber is adaptively set according to the required torque value. When the torque value of the driving member 4 driving the connected drill rod 6 for rotational locking is greater than or equal to the set anti-torque value, the force unloading component automatically rotates to unload the force. At the same time, the driving member 4 stops driving to avoid damage to the connecting thread or unstable connection due to excessive or insufficient rotational torque of the drill rod 6.

[0048] The torque resistance value should be within a range of values ​​while ensuring that the threaded connection is tight and the threads are not damaged.

[0049] Furthermore, the locking device 8 comprises: clamping blocks 10 slidably arranged on both sides of the top of the avoidance hole 9, and the opposite end faces of the clamping blocks 10 are provided with semicircular clamping surfaces;

[0050] Top plates 11 are arranged at intervals on the opposite end faces of the clamping blocks 10. The top plates 11 are connected to the clamping blocks 10 on the corresponding sides via telescopic members 12. The telescopic members 12 are used to drive the clamping blocks 10 on both sides to clamp or loosen the drill rod 6.

[0051] Arc grooves 13 are coaxially spaced apart from the clamping surface inside the clamping blocks 10 on both sides, and a connecting groove 14 is formed in the middle of the side of the arc groove 13 and penetrates the clamping surface. The unloading assembly is installed at the arc groove 13 and the connecting groove 14.

[0052] Specifically, the telescopic member 12 is a hydraulic telescopic rod.

[0053] Furthermore, the force unloading assembly includes: an arc-shaped limit slider 15, the limit slider 15 is slidingly sealed and arranged in the arc groove 13, and an arc-shaped clamping plate 17 is relatively rotatably arranged on the clamping surface, the clamping plate 17 is connected to the limit slider 15 through a connecting block 16, and the connecting block 16 is slidingly sealed and connected to the connecting groove 14.

[0054] Specifically, when the drill rod 6 is connected, the drill rod 6 is clamped by the clamping plate 17. When the torque value of the drill rod 6 driven by the driving member 4 to rotate is greater than or equal to the preset anti-torque value, the unloading component rotates relatively along the arc groove 13 and the connecting groove 14 to achieve unloading, thereby avoiding damage to the thread caused by excessive torque.

[0055] Furthermore, the arc groove 13 is connected to the limit slider 15 at either end along its extension direction through an elastic reset member 22, and the other end of the arc groove 13 together with the limit slider 15, the connecting block 16 and the clamping plate 17 constitute the pressure regulating sealing cavity, and a pressure sensor is arranged in the pressure regulating sealing cavity.

[0056] Specifically, an installation cavity is opened on the limit slider 15, and the elastic reset member 22 is installed at the bottom of the installation cavity. When the limit slider 15 rotates toward the elastic reset member 22, the elastic reset member 22 can completely enter the installation cavity for avoidance. The elastic reset member 22 is an arc-shaped elastic telescopic rod.

[0057] It should be explained that when the drill rod 6 is connected, the pressure regulating sealing chamber is located in front of the screwing direction of the drill rod 6 to be connected; when the drill rod 6 is removed, the direction is opposite. After the drill rod 6 is connected, the locking device 8 releases the drill rod 6, and the limit slider 15 is reset to the initial position under the elastic force of the elastic reset member 22.

[0058] Furthermore, two channels are provided on the peripheral side of each clamp block 10 to communicate with the pressure regulating sealing cavity, and a pressure regulating valve 18 and an air intake valve 19 are provided in the channels respectively, and the air intake valve 19 is connected to an external air pump;

[0059] Among them, gas is filled into the pressure regulating sealing chamber through the inlet valve 19 to an initial set air pressure, and then as the drill rod 6 is screwed, when the gas in the pressure regulating sealing chamber is compressed to a target set value, the pressure regulating valve 18 performs buffering pressure relief, and at the same time, the unloading component performs unloading.

[0060] The method for setting the torque resistance value of the pressure regulating sealing chamber is:

[0061] According to the principles of pressure sensing and mechanical transmission, when the air pressure in the sealed chamber is compressed to the target set value, the pressure sensor transmits a signal to the control end, and the control end controls the pressure regulating valve 18 to open for buffering pressure relief. At the same time, the unloading component rotates to unload the force.

[0062] Specifically, the telescopic member 12 first drives the clamping plate 17 to clamp and lock the lower part of the connecting thread of the drill rod 6 to be connected and the next drill rod 6, and then the clamping force acts on the arc groove 13 and the connecting groove 14 to form a stable sealed pressure-regulating sealing chamber; then the external air pump is controlled to fill the pressure-regulating sealing chamber with gas to the initial set air pressure; finally, the driving member 4 is controlled to drive the drill rod 6 to rotate. As the thread of the drill rod 6 is screwed in, the torque required for screwing gradually increases, and the air pressure in the pressure-regulating sealing chamber increases accordingly. When the air pressure value reaches the target set value, the pressure sensor transmits a signal to the control end, and the control end controls the pressure regulating valve 18 to open for buffering pressure relief, and the force unloading component rotates to unload the force; at the same time, the driving member 4 is controlled to stop driving to complete the connection of the drill rod 6.

[0063] When the drill rod 6 is to be disassembled, the telescopic member 12 drives the clamping plate 17 to clamp and lock the lower part of the connecting thread between the drill rod 6 to be disassembled and the next drill rod 6, and then the driving member 4 is reversed to drive the limiting slider 15 to the end surface of the arc groove 13 to disassemble the drill rod 6.

[0064] It should be noted that the torque value driving the drill rod 6 to rotate is positively correlated with the target set air pressure of the pressure regulating seal chamber, and the anti-torque value is provided by the air pressure in the pressure regulating seal chamber. The target set air pressure is determined by setting multiple sets of drill rod 6 screwing comparison experiments, taking the target set air pressure as a variable, and conducting comparison experiments with other parameters (drill rod 6, drive member 4 specifications, etc.) unchanged; the range of the target set air pressure is determined while ensuring the integrity of the connection thread and the continuous tightening of the drill rod 6. During implementation, the middle value of the experimental target set air pressure range is taken for continuous connection of the drill rod 6.

[0065] In another embodiment, a controller is provided to be connected to the pressure sensor to control the pressure regulating valve 18 according to the pressure value in the pressure regulating sealing chamber.

[0066] Specifically, according to the target set value of the air pressure of the pressure regulating sealed chamber, several pressure relief levels are set in order from large to small, and then the pressure range of each pressure relief level and the maintenance time of the pressure relief to each pressure relief level are set. When the pressure regulating sealed chamber is relieving pressure, the controller controls the pressure regulating valve 18 to open, monitors the pressure value in the pressure regulating sealed chamber through the pressure sensor, and transmits it to the controller in real time. When the pressure in the pressure regulating sealed chamber drops to the adjacent pressure relief level, the pressure sensor feeds back the pressure data to the controller in real time, and the controller controls the pressure regulating valve 18 to close. When the set maintenance time is reached, the controller controls the pressure regulating valve 18 to open again to continue to relieve pressure until the pressure value reaches the next pressure relief level. The pressure sensor feeds back the pressure data to the controller in real time, and repeats the above process until the pressure in the pressure regulating sealed chamber is consistent with the external atmospheric pressure, so as to realize the buffering pressure relief of the pressure regulating valve 18, provide buffering for the unloading component during the rotation unloading process, and reduce the inertia of the unloading component's rotation unloading.

[0067] Furthermore, a plug-in hole is provided in the middle of the facing sides of the limiting sliding block 15 and the clamping plate 17, and the connecting block 16 is inserted into the plug-in hole.

[0068] Furthermore, a flexible sealing layer 20 is provided on the insertion end of the connection block 16 and the outer curved surface of the clamping plate 17 .

[0069] Specifically, the flexible sealing layer 20 on the connecting block 16 is bonded to the bottom of the plug hole, and the flexible sealing layer 20 is made of polyurethane rubber. When the telescopic member 12 pushes the clamping block 10 to clamp the drill rod 6, the clamping plate 17 and the connecting block 16 squeeze the flexible sealing layer 20 to form a stable and sealed pressure regulating sealing cavity in the arc groove 13 and the connecting groove 14.

[0070] Furthermore, a plurality of guide grooves 21 are provided on the top of the base 1 in parallel with the telescopic member 12 , and a plurality of guide blocks are correspondingly provided on the bottom of the clamping block 10 , and the guide blocks are slidably arranged in the guide grooves 21 .

[0071] Furthermore, a ring seat 23 is coaxially installed at the bottom of the base 1 and the avoidance hole 9, a water inlet pipe 25 is arranged around the ring seat 23, and a plurality of nozzles 24 are evenly distributed on the inner side of the ring seat 23 along the circumferential direction and inclined downward, and the nozzles 24 are connected to the water inlet pipe 25 through the internal flow channel of the ring seat 23.

[0072] It should be explained that the water inlet pipe 25 is connected to a water source or an air source, and the high-pressure water flow or air flow sprayed by the nozzle 24 can automatically clean the rod body of the drill rod 6, making it easy to connect and disassemble the drill rod 6.

[0073] A method for using a geothermal drilling device includes:

[0074] S1. When the drill rod 6 needs to be connected, the top of the drill rod 6 at the top of the connected part is locked by the locking device 8;

[0075] S2, setting the anti-torque value of the locking device 8 according to the torque value required for the drill rod 6 to be connected;

[0076] S3, loosen the quick connector 5, and raise the quick connector 5 by at least the length of the drill rod 6 through the lifting member 3;

[0077] S4, using the auxiliary rod feeding device to connect the drill rod 6 to be connected with the quick connector 5;

[0078] S5, control the lifting member 3 and the driving member 4 to drive the drill rod 6 to be connected to move downward at a uniform speed and rotate. When the driving member 4 drives the drill rod 6 to rotate to the torque value required for locking, the force unloading assembly automatically rotates to unload the force, completing the installation of the drill rod 6 to be connected;

[0079] S6. When the drill rod needs to be disassembled, the lifting member 3 is controlled to completely release the top drill rod 6, and then the locking device 8 clamps and locks the upper part of the second drill rod 6 from top to bottom;

[0080] S7, controlling the driving member 4 to drive the top drill rod 6 to rotate in the opposite direction, so as to separate the top drill rod 6 from the drill rod 6 below it;

[0081] S8, using the auxiliary rod feeding device to clamp the top drill rod 6, controlling the quick connector 5 to release the drill rod 6, and realizing the disassembly of the drill rod 6;

[0082] S9, if further disassembly is required, the quick connector 5 is controlled to move downward to connect with the second drill rod 6 from top to bottom, and S6-S8 are repeated to achieve continuous disassembly of the drill rod 6.

[0083] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A geothermal drilling device, characterized in that: include: A base (1), wherein a relief hole (9) is provided through the middle of the base (1), a workbench (2) is arranged at intervals directly above the base (1), and the base (1) and the workbench (2) are connected via a plurality of lifting members (3) arranged on the peripheral sides; A driving member (4) is installed on the top of the workbench (2); a quick connector (5) is installed on the output end of the driving member (4) through the workbench (2); a drill rod (6) is coaxially installed at the lower end of the quick connector (5); and a drill bit (7) is installed at the lower end of the drill rod (6); A locking device (8) is symmetrically arranged around the center of the top of the avoidance hole (9), and a pressure-adjusting sealing chamber is arranged inside the locking device (8). The pressure-adjusting sealing chamber is used to adjust the anti-torque value when the locking device (8) locks the drill rod (6); The clamping surface of the locking device (8) is provided with a force unloading component which is rotatable along its extension direction, and the pressure regulating sealing chamber is used to provide a rotational anti-torque force to the force unloading component. When the torque value of the drill rod (6) rotating under the action of the driving member (4) is greater than or equal to the anti-torque value set by the locking device (8), the force unloading component automatically rotates to unload the force, thereby preventing the drill rod from being damaged by excessive or insufficient rotational torque or causing an unstable connection. The side of the base (1) is also provided with an auxiliary rod delivery device for automatically transporting and docking the drill rod (6); The locking device (8) comprises: clamping blocks (10) slidably arranged on both sides of the top of the avoidance hole (9), and the opposite end surfaces of the clamping blocks (10) are provided with semicircular clamping surfaces; The clamping blocks (10) on both sides are provided with arc grooves (13) coaxially spaced from the clamping surface, and a connecting groove (14) is provided in the middle of the side of the arc groove (13) and connected with the clamping surface, and the unloading assembly is installed at the arc groove (13) and the connecting groove (14); The unloading assembly comprises: an arc-shaped limiting slider (15), the limiting slider (15) is slidingly and sealingly arranged in the arc-shaped groove (13), an arc-shaped clamping plate (17) is relatively rotatably arranged on the clamping surface, the clamping plate (17) is connected to the limiting slider (15) via a connecting block (16), and the connecting block (16) is slidingly and sealingly connected to the connecting groove (14); The arc groove (13) is connected to the limit slider (15) at either end along its extension direction via an elastic reset member (22), and the other end of the arc groove (13) together with the limit slider (15), the connecting block (16) and the clamping plate (17) form the pressure regulating sealing cavity.

2. A geothermal drilling device according to claim 1, characterized in that: Top plates (11) are arranged at intervals on the opposite end faces of the clamping blocks (10); the top plates (11) are connected to the clamping blocks (10) on the corresponding sides via telescopic members (12); the telescopic members (12) are used to drive the clamping blocks (10) on both sides to clamp or loosen the drill rod (6).

3. A geothermal drilling device according to claim 1, characterized in that: A pressure sensor is arranged in the pressure regulating sealed cavity.

4. A geothermal drilling device according to claim 3, characterized in that: Two channels are provided on the peripheral side of each clamping block (10) and are connected to the pressure regulating sealing cavity. A pressure regulating valve (18) and an air intake valve (19) are provided in each channel respectively. The air intake valve (19) is connected to an external air pump. The gas is filled into the pressure regulating sealing chamber through the air inlet valve (19) to an initial set pressure, and then as the drill rod (6) is screwed, when the gas in the pressure regulating sealing chamber is compressed to a target set value, the pressure regulating valve (18) performs buffer pressure relief, and at the same time, the unloading assembly performs rotation unloading.

5. A geothermal drilling device according to claim 1, characterized in that: A plug-in hole is provided in the middle of the facing sides of the limiting sliding block (15) and the clamping plate (17), and the connecting block (16) is inserted into the plug-in hole.

6. A geothermal drilling device according to claim 1, characterized in that: A flexible sealing layer (20) is provided on the insertion end of the connection block (16) and the outer arc surface of the clamping plate (17).

7. A geothermal drilling device according to claim 2, characterized in that: The top of the base (1) is provided with a plurality of guide grooves (21) parallel to the telescopic member (12), and the bottom of the clamping block (10) is correspondingly provided with a plurality of guide blocks, and the guide blocks are slidably arranged in the guide grooves (21).

8. A geothermal drilling device according to claim 1, characterized in that: A ring seat (23) is coaxially mounted on the bottom of the base (1) and the avoidance hole (9); a water inlet pipe (25) is arranged on the circumferential side of the ring seat (23); a plurality of nozzles (24) are evenly distributed on the inner side of the ring seat (23) in a circumferential direction and inclined downward; the nozzles (24) are connected to the water inlet pipe (25) through a flow channel arranged inside the ring seat (23).

9. A geothermal drilling device according to any one of claims 1 to 8, characterized in that: The method for using the geothermal drilling device comprises: S1. When the drill rod (6) needs to be connected, the top of the drill rod (6) at the top of the connected part is locked by a locking device (8); S2, setting the anti-torque value of the locking device (8) according to the torque value required for the continued connection of the drill rod (6); S3, loosen the quick connector (5), and raise the quick connector (5) by a distance at least the length of the drill rod (6) through the lifting member (3); S4, using an auxiliary rod delivery device to connect the drill rod (6) to be connected with the quick connector (5); S5, controlling the lifting member (3) and the driving member (4) to drive the drill rod (6) to be connected to move downward at a uniform speed and rotate, and when the driving member (4) drives the drill rod (6) to rotate to the torque value required for locking, the force unloading component automatically rotates to unload the force, thereby completing the installation of the drill rod (6) to be connected; S6. When the drill rod needs to be disassembled, the lifting member (3) is controlled to completely release the top drill rod (6), and then the locking device (8) clamps and locks the upper part of the second drill rod (6) from top to bottom; S7, controlling the driving member (4) to drive the top drill rod (6) to rotate in the opposite direction, so as to separate the top drill rod (6) from the drill rod (6) below it; S8, using the auxiliary rod feeding device to clamp the top drill rod (6), controlling the quick connector (5) to release the drill rod (6), and realizing the disassembly of the drill rod (6); S9. If further disassembly is required, the quick connector (5) is controlled to move downward to connect with the second drill rod (6) from top to bottom, and S6-S8 are repeated to achieve continuous disassembly of the drill rod (6).

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