A flexible bundled drill pipe and a drill hole process without a joint

Abstract

This invention proposes a flexible bundled drill pipe and a drilling process that eliminates the need for connecting rods. The flexible bundled drill pipe integrates a single thick tube with multiple rows of channels. These channels are used for laying cables and signal lines, supplying fluid into the borehole, and removing drill cuttings. Furthermore, the flexible bundled drill pipe can bend under external force without breaking. This integrated flexible bundled drill pipe is intended to replace traditional rigid drill rods for underground drilling. This invention eliminates the need for connecting and disconnecting drill rods, improving the efficiency and safety of underground drilling and preventing drill bit burial accidents.

Description

Technical Field

[0001] This invention relates to the field of underground drilling technology and equipment, specifically a flexible bundled drill pipe and a drilling process that does not require connecting rods. Background Technology

[0002] Most existing underground drilling technologies use rigid drill rods to transmit drilling torque and drilling pressure. When the drilling depth is greater than the height of the drilling tower, the drill rod needs to be connected when going down and disassembled when going up. These two processes not only consume a lot of time and manpower and reduce work efficiency, but also easily lead to drill bit burial accidents because the return fluid is interrupted during the connection and disassembly of the drill rod.

[0003] In recent years, scholars both domestically and internationally have conducted extensive research on the shortcomings of traditional drilling technologies. Some new drilling technologies, such as hydraulic hammer drilling and air drilling, have improved drilling efficiency to some extent, but they still cannot avoid the problems of connecting and disconnecting drilling rods. While coiled tubing drilling technology theoretically allows for drilling without connecting rods, existing coiled tubing, due to having only one channel, suffers from problems in practical applications such as difficulty in returning slag, difficulty in guiding and controlling the drilling process, and insufficient drilling pressure. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems, thereby providing a flexible bundled drill pipe and a drilling process that does not require connecting rods;

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] The first objective of this invention is to provide a flexible bundled drill pipe.

[0007] The flexible bundled drill pipe is integrated with a thick tube and multiple channels. The multiple channels are used for laying cables, signal lines, delivering fluid into the borehole, and sucking up drill cuttings from the borehole. At the same time, the flexible bundled drill pipe can bend without breaking under external force. This integrated flexible bundled drill pipe is used to replace the traditional rigid drill pipe for underground drilling.

[0008] Another objective of this invention is to provide a drilling process that eliminates the need for connecting rods. This process uses flexible bundled drill pipes to replace traditional rigid drill rods for underground drilling operations. No rods need to be connected during drilling or removed during tripping. Fluid can be continuously supplied into the hole during both drilling and tripping, ensuring uninterrupted flow.

[0009] Optionally, a fluid generating device, a drill pipe axial drive, a drill pipe guiding and fixing device, a drill bit, a down-the-hole power device, and a slag inlet device can be used in conjunction with a flexible bundled drill pipe for drilling operations.

[0010] Optionally, the flexible bundled drill pipe is provided with a first type of channel and a second type of channel. The first type of channel is used to transport the materials and energy required for drilling to the drill bit and the down-the-hole power and cuttings inlet device. The second type of channel is connected to the down-the-hole power and cuttings inlet device and is used to receive and discharge drill cuttings. The fluid generating device is used to transport fluid into the hole or to extract drill cuttings from the hole. The drill pipe axial drive drives the flexible bundled drill pipe to drill down or lift up. The guide fixing device is used to constrain the radial position of the flexible bundled drill pipe to ensure the stability of the drilling direction. The drill bit directly acts on the formation. The down-the-hole power and cuttings inlet provides power to the drill bit and collects drill cuttings. One end of the flexible bundled drill pipe is connected to the fluid generating device, and the other end is connected to the down-the-hole power and cuttings inlet device. The down-the-hole power and cuttings inlet device is connected to or integrated with the drill bit. The drill pipe guide fixing device and the drill pipe axial drive are both installed around the outer wall of the drill pipe.

[0011] Optionally, the drill pipe axial drive includes a drive chain and a clamping mechanism. The clamping mechanism is disposed on the drive chain and wraps around the outer surface of the drill pipe. When the drive chain rotates, it drives the clamping mechanism to clamp the outer surface of the drill pipe, thereby driving the drill pipe to rise and fall through static friction.

[0012] Optionally, the down-the-hole power and cuttings inlet device is connected to or integrated with the drill bit, which further includes one or more fluid nozzles connected to the first type of channel for supplying fluid to the drill bit to assist drilling, while simultaneously flushing and cooling the drill bit, and helping to remove drill cuttings from the borehole.

[0013] Optionally, the drill pipe guiding and fixing device includes a distributed pressure sensor array and an adaptive adjustment mechanism, which dynamically adjusts the force angle of the guide wheel by real-time monitoring of the circumferential contact pressure distribution of the drill pipe. The correction formula is as follows:

[0014]

[0015] In the formula, Δθ is the correction angle, Kp is the formation coupling coefficient, Pi is the real-time contact pressure of the i-th sensor, φi is the circumferential angle of the sensor, and P̅ is the average contact pressure.

[0016] Optionally, a drilling process without a connecting rod includes the following steps:

[0017] S1. Flexible bundled drill pipes are used to replace traditional rigid drill pipes for underground drilling operations. No rods need to be connected during drilling or disassembled during tripping. Fluid can be continuously delivered into the hole during both drilling and tripping. The flexible bundled drill pipe integrates a first type of channel for delivering power medium and a second type of channel for slag removal.

[0018] S2. The flexible bundled drill pipe is axially advanced by the drill pipe axial drive, and the drill pipe axial drive adopts an adjustable speed drive mode to match the formation drilling resistance in real time.

[0019] S3. During the drilling process, the distributed pressure sensor array collects the circumferential contact pressure distribution data of the drill pipe in real time and dynamically adjusts the force application angle of the guide wheel to maintain the stability of the drilling axis;

[0020] S4. The drill bit is driven by a down-the-hole power unit to cut through the formation;

[0021] S5. Continuous slag discharge is implemented using the slag discharge port connected to the second type of channel;

[0022] S6. After reaching the designed hole depth, maintain the integrity of the drill pipe and lift the drill to complete the continuous operation of the entire hole without splicing or dismantling the drill rod.

[0023] In summary, the present invention has the following beneficial effects:

[0024] This invention eliminates the need for rod splicing and dismantling, saving significant time and labor. It can greatly improve the efficiency of underground drilling, avoid drill bit burial accidents caused by the interruption of backflow fluid during rod splicing and dismantling, and improve the safety and reliability of drilling operations. It is expected to be applied in multiple fields such as water conservancy engineering seepage prevention construction, foundation pile construction, mineral resource mining, geological exploration, and trenchless pipeline laying, and has important practical significance. Attached Figure Description

[0025] Figure 1 This is a front structural cross-sectional view of the present invention.

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the drill pipe of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1-First type of channel; 2-Second type of channel; 3-Drill pipe axial drive; 4-Drill pipe guide and fixing device; 5-Drill bit; 6-Down-the-hole power and slag inlet device; 7-Drive chain; 8-Holding mechanism; 9-First fluid generator; 10-Second fluid generator. Detailed Implementation

[0028] The technical solutions of this novel system embodiment will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Example:

[0030] like Figures 1-2 As shown, one object of the present invention is to provide a flexible bundled drill pipe.

[0031] The flexible bundled drill pipe is integrated with a thick tube and multiple channels. The multiple channels are used for laying cables, signal lines, delivering fluid into the borehole, and sucking up drill cuttings from the borehole. At the same time, the flexible bundled drill pipe can bend without breaking under external force. This integrated flexible bundled drill pipe is used to replace the traditional rigid drill pipe for underground drilling.

[0032] Another objective of this invention is to provide a drilling process that eliminates the need for connecting rods. This process uses flexible bundled drill pipes to replace traditional rigid drill rods for underground drilling operations. No rods need to be connected during drilling or removed during tripping. Fluid can be continuously supplied into the hole during both drilling and tripping, ensuring uninterrupted flow.

[0033] Optionally, a fluid generator, a drill pipe axial actuator 3, a drill pipe guide and fixing device 4, a drill bit 5, a down-the-hole power unit and a cuttings inlet device 6 are used in conjunction with a flexible bundled drill pipe for drilling operations.

[0034] The flexible bundled drill pipe is provided with a first type of channel 1 and a second type of channel 2. The first type of channel 1 is used to transport the required materials and energy to the drill bit 5 and the down-the-hole power and cuttings inlet device 6. The second type of channel 2 is connected to the down-the-hole power and cuttings inlet device 6 and is used to receive and discharge drill cuttings. The fluid generating device is used to transport fluid into the hole or to extract drill cuttings from the hole. The drill pipe axial drive 3 drives the flexible bundled drill pipe to drill down or lift up. The guiding and fixing device is used to constrain the radial position of the flexible bundled drill pipe to ensure the stability of the drilling direction. The drill bit 5 directly acts on the formation. The down-the-hole power and cuttings inlet provide power to the drill bit 5 and collect drill cuttings. One end of the flexible bundled drill pipe is connected to the fluid generating device, and the other end is connected to the down-the-hole power and cuttings inlet device 6. The down-the-hole power and cuttings inlet device 6 is connected to or integrated with the drill bit 5. The drill pipe guiding and fixing device 4 and the drill pipe axial drive 3 are both installed around the outer wall of the drill pipe. The fluid generating device includes a first fluid generating device 9 and a second fluid generating device 10. The first fluid generating device 9 is a slurry pump or an air compressor, and the second fluid generating device 10 is a sand pump.

[0035] The first type of channel 1 serves as a power and material transport channel, ensuring that the mud, power cables, and high-pressure fluid required during the drilling process can smoothly reach the drill bit 5 and the down-the-hole power unit. These materials and energy are an indispensable foundation for drilling operations, and their stable supply is directly related to drilling efficiency and success rate.

[0036] The second type of channel 2 is responsible for quickly discharging the drill cuttings generated during the drilling process, preventing the drill cuttings from accumulating inside the hole, thereby ensuring the continuity and efficiency of drilling. Timely discharge of drill cuttings is a key factor in maintaining the working efficiency of drill bit 5 and extending the service life of drill bit 5.

[0037] The drill pipe axial actuator 3 enables the drill pipe to be flexibly drilled or lifted in the hole, adapting to different drilling depths and formation conditions, thus improving operational flexibility and drilling efficiency.

[0038] The drill pipe guide and fixing device 4 greatly reduces deviations during the drilling process by ensuring the stability of the drilling direction, thereby improving the accuracy and quality of drilling, which is especially important for drilling operations in long distances and complex formations.

[0039] As a key component in the drilling process, drill bit 5 acts directly on the formation, and its performance directly affects the drilling speed and efficiency.

[0040] The down-the-hole power and slag inlet device 6 provides power to the drill bit 5 and collects drill slag at the same time, realizing the integration of drilling and slag removal, and improving the integration and efficiency of drilling operations.

[0041] Optionally, the drill pipe axial drive 3 includes a drive chain 7 and a holding mechanism 8. The holding mechanism 8 is mounted on the drive chain 7 and wraps around the outer surface of the flexible bundled drill pipe. When the drive chain 7 rotates, it drives the holding mechanism 8 to clamp the outer surface of the flexible bundled drill pipe, and the flexible bundled drill pipe is raised and lowered by static friction. The drill pipe axial drive 3 has an adjustable speed function to adjust the drilling speed of the drill pipe according to the actual needs during the drilling process.

[0042] The drill pipe axial drive 3 allows the drilling or lifting speed of the drill pipe to be adjusted in real time according to the actual needs during the drilling process. When the formation conditions change or drilling resistance is encountered, the speed can be adjusted in a timely manner to optimize drilling efficiency and reduce energy waste, providing more options to adapt to different drilling environments and operational requirements.

[0043] The down-the-hole power and cuttings inlet device 6 is connected to or integrated with the drill bit 5. The drill bit 5 also includes one or more fluid nozzles, which are connected to the first type of channel 1 to provide fluid to the drill bit 5 to assist drilling, and at the same time flush and cool the drill bit 5, and carry the cuttings out of the borehole.

[0044] The fluid can more effectively break up the formation and increase the drilling speed. At the same time, the fluid can also flush and cool the drill bit 5, reduce the wear and damage of the drill bit 5, and extend its service life. The fluid nozzle also helps to remove drill cuttings from the borehole during the drilling process, keeping the borehole clean and unobstructed, and further improving the continuity and efficiency of drilling operations.

[0045] Optionally, the drill pipe guiding and fixing device 4 includes a distributed pressure sensor array and an adaptive adjustment mechanism, which dynamically adjusts the force angle of the guide wheel by real-time monitoring of the circumferential contact pressure distribution of the drill pipe. The correction formula is as follows:

[0046]

[0047] In the formula, Δθ is the correction angle, Kp is the formation coupling coefficient, Pi is the real-time contact pressure of the i-th sensor, φi is the circumferential angle of the sensor, and P̅ is the average contact pressure.

[0048] The distributed pressure sensor array and adaptive adjustment mechanism in the drill pipe guide fixing device 4 significantly improve the accuracy and quality of drilling by dynamically adjusting the force angle of the guide wheel through real-time monitoring of the circumferential contact pressure distribution of the drill pipe. It can promptly detect and correct deviations during the drilling process, avoiding drilling failure or quality degradation caused by the accumulation of deviations. Based on the real-time monitored pressure data, the adaptive adjustment mechanism can quickly adjust the force angle of the guide wheel to ensure the stability of the drilling axis, making the adjustment process more scientific and accurate, and improving the efficiency and accuracy of deviation correction.

[0049] Optionally, the present invention provides a drilling process that does not require a connecting rod, comprising the following steps:

[0050] S1. Flexible bundled drill pipes are used to replace traditional rigid drill pipes for underground drilling operations. No rods need to be connected during drilling or disassembled during tripping. Fluid can be continuously delivered into the hole during both drilling and tripping. The flexible bundled drill pipe integrates a first type of channel for delivering power medium and a second type of channel for slag removal.

[0051] S2. The flexible bundled drill pipe is axially advanced by the drill pipe axial drive, and the drill pipe axial drive adopts an adjustable speed drive mode to match the formation drilling resistance in real time.

[0052] S3. During the drilling process, the distributed pressure sensor array collects the circumferential contact pressure distribution data of the drill pipe in real time and dynamically adjusts the force application angle of the guide wheel to maintain the stability of the drilling axis;

[0053] S4. The drill bit is driven by a down-the-hole power unit to cut through the formation;

[0054] S5. Continuous slag discharge is implemented using the slag discharge port connected to the second type of channel;

[0055] S6. After reaching the designed hole depth, maintain the integrity of the drill pipe and lift the drill to complete the continuous operation of the entire hole without splicing or dismantling the drill rod.

[0056] By using continuous axial propulsion, continuous drilling of the entire borehole section was achieved, improving the efficiency and continuity of drilling operations. The drilling speed of the drill pipe was adjusted in real time according to changes in formation drilling resistance, optimizing drilling efficiency and energy utilization. By monitoring and adjusting the force angle of the guide wheel in real time, the stability of the drilling axis was maintained, improving the accuracy and quality of the borehole. By adjusting the jet velocity of the fluid nozzle, drilling efficiency and drill bit life were optimized. Continuous slag removal was achieved through the slag removal structure, keeping the borehole clean and unobstructed.

[0057] This application integrates multiple functional modules to achieve efficient, accurate, and reliable drilling operations. Through the first type of channel 1, the system provides the drill bit 5 and the down-the-hole power unit with necessary power and material support, such as mud, power cables, and high-pressure fluid. These materials and energy are fundamental to drilling operations, ensuring that the drill bit 5 can function normally and break up the formation. The second type of channel 2 is responsible for rapidly discharging the drill cuttings generated during drilling. The cuttings removal structure ensures the continuity and stability of the cuttings removal process, preventing drill cuttings from accumulating in the hole and affecting drilling efficiency. The drill pipe axial actuator 3 enables the drilling of the drill pipe in and out of the hole, through adjustable speed... The system functions to adjust the drilling speed according to the actual needs during the drilling process, adapting to changes in different formations and drilling conditions. The drill pipe guide and fixing device 4 monitors the circumferential contact pressure distribution of the drill pipe in real time through a distributed pressure sensor array and an adaptive adjustment mechanism, dynamically adjusts the force angle of the guide wheel, corrects deviations during the drilling process, and maintains the stability of the drilling axis. The down-the-hole power and cuttings inlet device 6 provides power to the drill bit 5 and collects drill cuttings at the same time. The fluid nozzle provides high-pressure fluid to the drill bit 5 to assist drilling and flush and cool the drill bit 5, extending the service life of the drill bit 5. The fluid nozzle improves drilling efficiency and the service life of the drill bit 5.

[0058] During use, the drill pipe axial drive 3 is activated to slowly lower the drill pipe to the predetermined depth. During the lowering process, the drill pipe guide and fixing device 4 monitors the circumferential contact pressure distribution of the drill pipe in real time and dynamically adjusts the force angle of the guide wheel to maintain the stability of the drilling axis. When the drill bit 5 reaches the predetermined depth, the down-the-hole power unit is activated to provide power to the drill bit 5 to start drilling. At the same time, high-pressure fluid is supplied to the drill bit 5 through the first type of channel 1 to assist drilling and flush and cool the drill bit 5. The drill cuttings generated during drilling are quickly discharged from the hole through the second type of channel 2 to ensure the continuity and efficiency of drilling. According to the changes in the drilling strata and the real-time situation of drilling resistance, the lowering or lifting speed of the drill pipe is adjusted to optimize drilling efficiency. When the drilling reaches the predetermined depth or the drilling task is completed, the drill pipe axial drive 3 is activated to slowly lift the drill pipe out of the hole. During the lifting process, the drill pipe guide and fixing device 4 continues to monitor and adjust the stability of the drilling axis to ensure the safe lifting of the drill pipe.

[0059] This application integrates multiple functional modules required during drilling, such as power, material transmission, cuttings removal, axial propulsion and lifting, drilling direction control, and power and cuttings feeding for drill bit 5, through an integrated design. This forms a highly efficient and collaborative working system, which greatly reduces the coordination time and energy loss between components and improves the overall efficiency of drilling operations. The adjustable speed function of the drill pipe axial drive 3 allows the drilling or lifting speed to be flexibly adjusted according to the actual needs during drilling, adapting to changes in different formations and drilling conditions, further optimizing drilling efficiency. The fluid nozzle improves the drilling speed and the service life of drill bit 5.

[0060] The drill pipe guiding and fixing device 4 monitors the circumferential contact pressure distribution of the drill pipe in real time through a distributed pressure sensor array and an adaptive adjustment mechanism, dynamically adjusts the force application angle of the guide wheel, effectively corrects deviations during the drilling process, maintains the stability of the drilling axis, and greatly improves the accuracy of drilling.

[0061] This application uses flexible bundled drill pipe as a continuous drilling unit. Through continuous axial advance, real-time matching of formation drilling resistance, dynamic adjustment of guide wheel force angle, and continuous slag removal, it achieves continuous operation without connecting rods throughout the entire hole section. This avoids problems that may occur during connecting rods, improves the reliability of drilling operations, and ensures the continuity and stability of the slag removal process by designing the slag removal structure. It also prevents drill cuttings from accumulating in the hole and affecting work efficiency, further enhancing the efficiency of drilling.

[0062] The down-the-hole power and slag inlet device 6 provides power to the drill bit 5 while also supplying high-pressure fluid to the drill bit 5 through a fluid nozzle to flush and cool the drill bit 5, reducing wear and damage to the drill bit 5 and extending its service life. The fluid nozzle further extends the service life of the drill bit 5.

[0063] This application significantly reduces the cost of drilling operations through optimizations in various aspects, such as improving drilling efficiency, enhancing drilling accuracy, improving drilling reliability, and extending the service life of drill bits. The drilling process without the need for connecting rods reduces the time and cost consumption during the connecting rod process, improves operational efficiency, and further reduces operational costs.

[0064] This application eliminates the need for rod splicing and dismantling, saving significant time and labor. It can greatly improve the efficiency of underground drilling, avoid drill bit burial accidents caused by the interruption of backflow fluid during rod splicing and dismantling, and improve the safety and reliability of drilling operations. It is expected to be applied in multiple fields such as water conservancy engineering seepage prevention construction, foundation pile construction, mineral resource mining, geological exploration, and trenchless pipeline laying, and has important practical significance.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flexible bundled drill pipe, characterized in that, the flexible bundled drill pipe is integrated with one thick pipe and multiple columns of channels, which are used to lay cables, signal lines, deliver fluid into the borehole, and pump out drilling residue, and the flexible bundled drill pipe can be bent without breaking under external force, and the integrated flexible bundled drill pipe is used to replace traditional rigid drill pipes for underground drilling purposes; a drilling operation is performed by combining a fluid generating device, a drill pipe axial driver, a drill pipe guiding and fixing device, a drill bit, a downhole power and residue inlet device with the flexible bundled drill pipe; the flexible bundled drill pipe is provided with first type channels and second type channels, the first type channels are used to deliver materials and energy required for drilling to the drill bit and the downhole power and residue inlet device, the second type channels are connected with the downhole power and residue inlet device and are used to receive and discharge drilling residue, the fluid generating device is used to deliver fluid into the borehole or pump out drilling residue, the drill pipe axial driver drives the flexible bundled drill pipe to drill down or lift, the guiding and fixing device is used to constrain the radial position of the flexible bundled drill pipe and ensure the stability of the drilling direction, the drill bit directly acts on the formation, the downhole power and residue inlet device provides power for the drill bit and collects drilling residue, one end of the flexible bundled drill pipe is connected with the fluid generating device, the other end is connected with the downhole power and residue inlet device, the downhole power and residue inlet device is connected with the drill bit or integrated with the drill bit, and the drill pipe guiding and fixing device and the drill pipe axial driver are both installed around the outer wall of the drill pipe.

2. A drilling process without the need for connecting rods, characterized in that, the flexible bundled drill pipe of claim 1 is used to replace traditional rigid drill pipes for underground drilling operations, and there is no need to connect rods during drilling and no need to disassemble rods during lifting, and fluid can be continuously delivered into the borehole during drilling and lifting.

3. The drilling process without the need for connecting rods according to claim 2, characterized in that, the drill pipe axial driver includes a driving chain and a holding mechanism, the holding mechanism is arranged on the driving chain and is installed around the outer wall of the drill pipe, when the driving chain rotates, the holding mechanism clamps the outer surface of the drill pipe and drives the drill pipe to ascend or descend through static friction.

4. The drilling process without the need for connecting rods according to claim 2, characterized in that, the drill pipe guiding and fixing device includes a distributed pressure sensor array and an adaptive adjustment mechanism, which dynamically adjusts the force angle of the guiding wheel by real-time monitoring of the circumferential contact pressure distribution of the drill pipe, and the deviation correction formula is: where Δθ is the deviation correction angle, Kp is the formation coupling coefficient, Pi is the real-time contact pressure of the i th sensor, φi is the circumferential angle of the sensor, and P̅ is the average contact pressure.

5. The drilling process without the need for connecting rods according to claim 2, characterized in that, the downhole power and residue inlet device is connected with the drill bit or integrated with the drill bit, and the drill bit further includes one or more fluid nozzles, the fluid nozzles are connected with the first type channels and are used to provide fluid to the drill bit to assist drilling, flush and cool the drill bit, and carry drilling residue out of the borehole.

6. The drill-in process without a contact rod according to claim 4, characterized in that Comprising the following steps: S1. Replace the traditional rigid drill pipe with a flexible cluster drill pipe for underground drilling operation, without the need for connecting rods during drilling and without the need for disassembling rods during tripping, and continuously conveying fluid into the hole during drilling and tripping, with continuous flow, the flexible cluster drill pipe is integrated with a first type of channel for conveying power medium and a second type of channel for slag discharge; S2. Axial propulsion of the flexible cluster drill pipe is implemented by the drill pipe axial drive, which uses adjustable speed drive to match the formation drilling resistance in real time; S3. During drilling, the distributed pressure sensor array collects the circumferential contact pressure distribution data in real time, and dynamically adjusts the force angle of the guide wheel to keep the drilling axis stable; S4. The drill bit is driven by the downhole power device to cut the formation; S5. Continuous slag discharge is implemented using the slag discharge port connected to the second type of channel; S6. After reaching the designed hole depth, the drill pipe integrity is maintained for tripping, and the whole hole continuous operation without connecting rods and disassembling rods is completed.

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