A supercritical liquid nitrogen jet hard rock drilling method

Abstract

This invention relates to a supercritical liquid nitrogen jet drilling method for hard rock, addressing the problems of low drilling efficiency and significant tool wear associated with conventional water jet drilling in hard rock formations. Based on the principle of alternating hot and cold fracturing, this invention achieves high drilling efficiency in hard rock through the convergence of supercritical liquid nitrogen and high-temperature water. The drilling device based on this method incorporates a mechanical pulse device and a nozzle oscillation device, effectively breaking up hard rock protrusions that are not cut by the drill bit and are prone to wear. Compared with conventional drilling methods, this method improves drilling efficiency and reduces drill bit and tool wear.

Description

Technical Field

[0001] This invention relates to the field of rock drilling, and more specifically to a supercritical liquid nitrogen jet hard rock drilling method. Background Technology

[0002] Currently, drilling in hard rock sections is extremely difficult during the development of oil and mineral resources. How to drill more effectively in hard rock sections is one of the main problems that currently plagues technicians. The difficulties of drilling in hard rock sections are: (1) Drilling in hard rock sections is a high-material-consumption operation. Although using water jet-assisted rock drilling technology alone can help expand rock fissures and thus increase drilling speed, using only water as the jet fluid cannot avoid the problem of insufficient water reserves; (2) Drilling in hard rock sections is a high-energy-consumption operation. Excessive energy consumption not only fails to meet economic requirements, but also easily leads to equipment wear and tear during drilling; (3) Ordinary drill bits experience extreme wear during drilling in hard rock sections, which can lead to slow drilling progress. Improving drilling efficiency and reducing tool consumption are the main goals for reducing the cost of hard rock tunneling, and are also the fundamental tasks of major projects such as energy development and tunnel construction.

[0003] Therefore, improving drilling efficiency and extending drill bit life in hard rock sections requires innovation of existing technologies from multiple perspectives. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of low drilling efficiency and high tool wear of ordinary water jets when drilling in hard rock formations, and to provide a supercritical liquid nitrogen jet hard rock drilling method.

[0005] The technical solution adopted in this invention is: a supercritical liquid nitrogen jet hard rock drilling method, which mainly includes the following steps:

[0006] Step 1: Simultaneously, water and liquid nitrogen are passed through the infusion pipe (6) and the heat-insulating and pressure-maintaining pipe (7) respectively. After being processed by the water pump (3), the heating sleeve (15-1) and the medium-pressure container (5) with electric heating elements (4), high-temperature water and supercritical liquid nitrogen are formed.

[0007] Step 2: Start the drilling power unit and start drilling. At the same time, the two fluids distributed on the drill bit wings are sprayed out by the high-pressure nozzle (15-4) and converge on the hard rock surface. The three streams of high-temperature water sprayed out by the drill bit side nozzle swing device (15-3) converge with the three streams of supercritical liquid nitrogen jets in the center of the drill bit on the side of the hard rock protrusion. The alternating hot and cold fracturing effect is used to improve the rock breaking efficiency.

[0008] Preferably, step 2 includes the following feature: the supercritical liquid nitrogen jet is controlled by a mechanical pulse device.

[0009] Preferably, the method for controlling the supercritical liquid nitrogen jet using a mechanical pulse device is as follows: First, the magnetic balls in four directions on the curved steel sheet are encased in magnetic ball baffles (15-2-1). The magnetic balls in directions A and C are first controlled to detach from the closed baffles. The specific procedure is as follows: the driven wheel A (15-2-11) in the baffle switch device (15-2) slides and adheres along the wheel axle (15-2-13) towards the magnetic area of ​​the driving wheel (15-2-10) with its built-in AC control magnetic area. Simultaneously, the shaft motor (15-2-14) controls the wheel axle and driving wheel to rotate counterclockwise, causing the protruding point on the driven wheel A to engage with the recessed area of ​​the driving wheel with its built-in AC control magnetic area. The traction line (15-2-7)... The driven wheel (15-2-5) retracts to the driven wheel A, causing the L-shaped baffle (15-2-5) with its built-in spring to open outwards until it reaches a horizontal position. At this point, the driving wheel stops rotating, and the traction line stops retracting. The driven wheel (15-2-12) slides along the axle to attract the magnetic area. Then, the driving wheel rotates counterclockwise, causing the protruding point on the driven wheel B to engage with the recessed area of ​​the driving wheel with its built-in AC control magnetic area. The traction line retracts to the driven wheel B, causing the retraction spring to rotate until the magnetic ball baffle rotates parallel to the tube wall, stopping the driving wheel. Then, the AC current changes direction, pushing the driven wheel A out of the driving wheel slot. The L-shaped baffle with its built-in spring closes towards the baffle, thus locking the baffle and forming points B and D. Two balls are held in place, while balls A and C are free. By controlling the frequency, the following situation is formed where balls A and C are held in place, while balls B and D are free. The magnetic zone (15-2-2) with DC current works throughout the process, ensuring that when the magnetic ball is in the induction phase of the induction zone, it is resisted by the attraction force when rotating to the magnetic zone, which facilitates the operation of the magnetic ball baffle. When the magnetic ball is in the induction phase of the non-induction zone, it is briefly attracted when rotating through the magnetic zone, and then leaves the attraction range due to the jet impulse being greater than the attraction force, resulting in a delay and making the flow rate change more obvious. By comprehensively utilizing the above cycle, the curved steel sheet (16) with magnetic balls (ABCD) connected around it rotates in two directions in the tube to control the flow rate. After being ejected at the high-pressure nozzle (15-4), it can form a pulsed jet with varying flow rate.

[0010] A supercritical liquid nitrogen jet hard rock drilling device is disclosed according to a supercritical liquid nitrogen jet hard rock drilling method. The device mainly includes a hydraulic drilling rig chuck, a rotary water feeder, a three-wing drill bit, a baffle switch lock, insulated and pressure-maintaining pipes, a high-pressure nozzle, drill rods, a heating sleeve, a junction box, and conductive wires. Liquid nitrogen in a medium-pressure vessel equipped with electric heating elements and water passing through the heating sleeve form two jets that can converge at different designated points. These jets converge at the hard rock surface using a high-pressure nozzle, producing a rock-breaking effect. The drilling power unit includes a hydraulic drilling chuck, an electric pulley, and a fixed pile. The hydraulic drilling chuck provides rotational power and propulsion force, while the fixed pile and electric pulley are used to fix the equipment and provide a propulsion track. The external generating device includes a liquid nitrogen tank, a water tank, a water pump, and insulated and pressure-maintaining pipelines. The insulated and pressure-maintaining pipelines connect various equipment to form a preliminary fluid transport path.

[0011] The beneficial effects of this invention are as follows:

[0012] 1. The drilling device based on this critical liquid nitrogen jet hard rock drilling method has the effect of protecting the drill bit. By the convergence of the rotating jet arranged laterally on the drill bit and the vertical jet in the center of the drill bit, horizontal shearing damage can be performed on the hard rock bosses generated during drilling that are not cut by the tool but crushed. Furthermore, the lateral nozzle oscillation device can increase the horizontal force range of the bosses. The principle is that since the compressive strength of most rock materials is much higher than their shear strength, effectively utilizing their low shear strength mechanical property can improve drilling efficiency, prevent drill bit wear, and increase tool life.

[0013] 2. The drilling device based on this supercritical liquid nitrogen jet hard rock drilling method can improve drilling efficiency. It effectively utilizes the strong rock fracturing and penetrating properties of supercritical nitrogen to enhance rock breaking ability.

[0014] 3. The drilling device based on this supercritical liquid nitrogen jet hard rock drilling method can create a fracturing effect through alternating hot and cold heating. It utilizes the convergence of a low-temperature continuous jet of supercritical nitrogen and a high-temperature pulsed water jet. The pulsed jet is controlled by a mechanical pulse device consisting of a baffle switch and a curved steel sheet connected to a magnetic ball, which improves the efficiency of hard rock fracturing and crushing, while also causing rock chips to be discharged with the fluid. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall invention.

[0016] Figure 2 for Figure 1 Front view of section I-I.

[0017] Figure 3 This is a cross-sectional view of the drill bit.

[0018] Figure 4 This is a top view of the drill bit.

[0019] Figure 5 This is an axial cross-sectional view of the section of the pipeline with the mechanical pulse device.

[0020] Figure 6 for Figure 5 Front view of section II-II.

[0021] Figure 7 for Figure 5 Front view of section III-III.

[0022] Figure 8 This is a schematic diagram of a baffle switch device.

[0023] Figure 9 for Figure 8 Front view of section IV-IV.

[0024] Figure 10 This is a schematic diagram of a baffle switch lock.

[0025] Figure 11 This is a schematic diagram of the driven wheel.

[0026] Figure 12 This is a side view of the drive wheel.

[0027] Figure 13 for Figure 12 Front view of section V-V.

[0028] Figure 14 This is a schematic diagram of a nozzle oscillation device.

[0029] Figure 1 In the middle: 1 is liquid nitrogen tank, 2 is water tank, 3 is water pump, 4 is electric heating element, 5 is medium pressure vessel, 6 is heat-insulated and pressure-maintaining pipeline, 7 is liquid delivery pipe, 8 is sealing ring, 9 is rotary water conveyor, 10 is hydraulic drilling rig chuck, 11 is electric pulley, 12 is fixed pile, 13 is wellhead sealing device, 14 is drill rod, 15 is drill bit; Figure 3 In the middle section: 15-1 is the heating sleeve, 15-2 is the baffle switch device, 15-3 is the nozzle swing device, and 15-4 is the high-pressure nozzle; Figure 6 In the middle: 16 is a curved steel sheet with magnetic spheres (ABCD) connected around its four sides; Figure 8 In the middle section: 15-2-1 is a magnetic ball baffle, 15-2-2 is a magnetic area with DC current, and 15-2-3 is a pressure sensor; Figure 9In the middle: 15-2-4 is a spring, 15-2-5 is an L-shaped baffle with a built-in torsion spring, 15-2-6 is a spring storage box, 15-2-7 is a traction line, 15-2-8 is a power wire, 15-2-9 is a baffle switch lock box, 15-2-10 is a drive wheel with a built-in AC power control magnetic zone, 15-2-11 is a driven wheel A, 15-2-12 is a driven wheel B, 15-2-13 is a wheel axle, and 15-2-14 is a shaft motor; Figure 14 In the diagram: 15-3-1 is the joystick motor, 15-3-2 is joystick A, 15-3-3 is the connecting rod, and 15-3-4 is joystick B. Detailed Implementation

[0030] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] A supercritical liquid nitrogen jet hard rock drilling device mainly includes a drill bit (15), an external generating device, and a drilling power unit. The drill bit mainly includes a heated casing (15-1), a baffle switch device (15-2), a nozzle swing device (15-3), a high-pressure nozzle (15-4), and a curved steel sheet (16) with magnetic balls connected around it. The external generating device mainly includes a liquid nitrogen tank (1), a water tank (2), a water pump (3), an electric heating element (4), a medium-pressure vessel (5), a heat-insulating and pressure-maintaining pipeline (6), and a liquid delivery pipe (7). The drilling power unit includes a sealing ring (8), a rotary water delivery device (9), a hydraulic drilling rig chuck (10), an electric pulley (11), a fixed pile (12), a wellhead sealing device (13), and a drill rod (14). The supercritical liquid nitrogen jet inside the drill bit is controlled by a mechanical pulse device, which is installed in each heat-insulating and pressure-maintaining pipe in the drill bit, adjacent to the nozzle. The mechanical pulse device consists of a curved steel sheet (16) with magnetic balls (ABCD) connected around the axis of the pipe and a baffle switch device (15-2) on the pipe wall. The magnetic area (15-2-2) and the sensing area (15-2-3) with DC current are surrounded by four magnetic ball baffles (15-2-1). The magnetic ball baffles are connected to the driven wheel B (15-2-12) through a traction line passing through the spring storage box (15-2-6). One end of the spring (15-2-4) is connected to... On the magnetic ball baffle, the other end is connected to the spring storage box. The L-shaped baffle (15-2-5) with built-in torsion spring is located on the inner side of the tube wall and is connected to the traction line (15-2-7) on the driven wheel A (15-2-11). The two ends of the wheel axle (15-2-13) are fixed to a pair of opposing walls inside the baffle switch lock box (15-2-9). The driving wheel (15-2-10) with built-in AC control magnetic area is fixed in the center of the wheel axle. Driven wheel A and driven wheel B are connected in series on both sides. A shaft motor (15-2-14) is fixed at one end. The contact surface between the driven wheel and the shaft is coated with lubricant. The wire (15-2-8) connects the shaft motor and various accessories such as the sensing area. A portion of the high-temperature water jet inside the drill bit is ejected through a high-pressure nozzle after being controlled by a nozzle oscillation device (15-3). The nozzle oscillation device is located on the inner branch pipe of the fluid delivery tube in the drill bit, adjacent to the transverse nozzle, and consists of a double rocker mechanism and a rocker motor (15-3-1). In the double rocker mechanism, rocker A (15-3-2) is connected to the output shaft of the rocker motor, and rocker A (15-3-2) and rocker B (15-3-4) are connected by a connecting rod (15-3-3). The other portion of the high-temperature water jet is ejected from three high-pressure nozzles on the outer branch pipe of the fluid delivery tube in the drill bit.The heat-insulating and pressure-maintaining pipeline (6) connects the liquid nitrogen tank (1) and the rotary water conveyor (9), with a medium-pressure vessel (5) in between. The infusion pipe connects the water pump (3) and the rotary water conveyor. The initial junction of the rotary water conveyor with the heat-insulating and pressure-maintaining pipeline (6) and the infusion pipe is sealed by a sealing ring (8). The drill bit (15) is connected to the bottom of the drill rod (14) using a pipe thread connection. The hydraulic drilling rig chuck (10) is installed on the fixed pile (12) and is driven by the electric pulley (11) and the hydraulic drilling rig chuck (10) to rotate and advance the drill rod and drill bit.

[0032] The supercritical liquid nitrogen jet hard rock drilling method mainly includes the following working process:

[0033] As the drill bit (15) and drill rod (14) begin drilling under the control of the hydraulic drilling rig chuck (10), the liquid nitrogen in the liquid nitrogen tank (1) is heated and pressurized by the medium-pressure vessel (5) with electric heating elements (4) to form supercritical liquid nitrogen. Then, it is transported to the drill bit (15) through the rotating water conveyor (9) in the heat-insulating and pressure-insulating pipeline (6) and divided into 6 supercritical liquid nitrogen jets. Initially controlled by a mechanical pulse device, the magnetic balls in all four directions on the curved steel sheet are encased in magnetic ball baffles (15-2-1). First, the magnetic balls in directions A and C are controlled to disengage from the closed baffles. The specific procedure is as follows: the driven wheel A (15-2-11) in the control baffle switch device (15-2) slides and attracts along the wheel axle (15-2-13) towards the magnetic area of ​​the driving wheel (15-2-10) with its built-in AC control magnetic field. Simultaneously, the shaft motor (15-2-14) controls the wheel axle and driving wheel to rotate counterclockwise, causing the protruding point on the driven wheel A to engage with the recessed area of ​​the driving wheel with its built-in AC control magnetic field. The traction line (15-2-7) is then retracted to the driven wheel. On the driving wheel A, the L-shaped baffle (15-2-5) with the built-in spring opens outwards to the horizontal position, at which point the driving wheel stops rotating and the traction line stops retracting. The driven wheel B (15-2-12) slides along the axle to attract the magnetic area. Then, the driving wheel is controlled to rotate counterclockwise, causing the protruding point on the driven wheel B to engage with the recessed area of ​​the driving wheel with the built-in AC control magnetic area. The traction line retracts to the driven wheel B, thereby driving the retraction spring until the magnetic ball baffle rotates parallel to the tube wall, and the driving wheel stops rotating. Then, the AC current changes direction, pushing the driven wheel A out of the driving wheel slot. The L-shaped baffle with the built-in spring closes towards the baffle, thus locking the baffle, resulting in balls B and D being locked while balls A and C are free. By controlling the frequency, to achieve the next state where balls A and C are locked while balls B and D are free, balls B and D need to be released by the baffle while balls A and C are locked. The release process of balls B and D is the same as that of balls A and C described above. The procedure for balls A and C to be held in place is as follows: The sensing zone is also controlled by a certain frequency. When the sensing zone is in the sensing stage and a change in pressure is detected, the driven wheel A in the baffle switch lock is immediately attracted to the magnetic area of ​​the driving wheel. At the same time, the driving wheel of the built-in AC control magnetic area rotates counterclockwise, which makes the protruding point on the driven wheel A lock with the concave area of ​​the driving wheel of the built-in AC control magnetic area. The traction line is retracted to the driven wheel A, thereby driving the L-shaped baffle with the built-in spring to open outward, thus releasing the spring and holding balls A and C in place.The magnetic zone (15-2-2) with DC power works throughout the entire process, which can ensure that when the magnetic ball is in the induction phase of the induction zone, it is resisted by the attraction when it rotates to the magnetic zone, which facilitates the operation of the magnetic ball baffle. When the magnetic ball is in the induction phase of the non-induction zone, it is briefly attracted when it rotates through the magnetic zone, and then it leaves the attraction range because the jet impulse is greater than the attraction force, resulting in a delay, which makes the flow rate change more obvious. By comprehensively utilizing the above cycle, the curved steel sheet (16) with magnetic balls (ABCD) connected around it forms a two-way rotation in the tube, thereby controlling the flow rate. After being ejected at the high-pressure nozzle (15-4), it can form a pulsed jet with a changing flow rate.

[0034] Meanwhile, the water in the water tank (2) is transported to the high-pressure nozzle of the drill bit by the water pump (3). After being heated into high-temperature water by the heating sleeve (15-1) in front of the nozzle, part of it is controlled by the three nozzle swing devices on the bifurcation pipe inside the drill bit. That is, the rocker motor (15-3-1) controls the double rocker mechanism to drive the horizontal high-pressure nozzle connected to it to swing horizontally, so that the water flow can be sprayed out in a fan-shaped and page-like manner. The other part is sprayed out from the outside of the water supply pipe in the drill bit to the three high-pressure nozzles on the bifurcation pipe, which all intersect with the supercritical liquid nitrogen jet to break the rock.

Claims

1. A supercritical liquid nitrogen jet hard rock drilling method, characterized in that, The main steps include: Step 1: Simultaneously, water and liquid nitrogen are passed through the infusion pipe (7) and the heat preservation and pressure preservation pipe (6) respectively. After being processed by the water pump (3), the heating sleeve (15-1) and the medium-pressure container (5) with electric heating elements (4), high-temperature water and supercritical liquid nitrogen are formed. Step 2: Start the drilling power unit and start drilling. At the same time, the two fluids distributed on the drill bit wings are sprayed out by the high-pressure nozzle (15-4) and converge on the hard rock surface. The three streams of high-temperature water sprayed out by the drill bit side nozzle swing device (15-3) converge with the three streams of supercritical liquid nitrogen jets in the center of the drill bit on the side of the hard rock protrusion. The alternating hot and cold fracturing effect is used to improve the rock breaking efficiency. Step 2 includes the following features: the supercritical liquid nitrogen jet is controlled by a mechanical pulse device; The method of controlling the supercritical liquid nitrogen jet with a mechanical pulse device is as follows: First, the magnetic balls in four directions on the curved steel sheet are all wrapped in the magnetic ball baffle (15-2-1). First, control the magnetic balls in directions A and C to disengage from the closed baffle. The specific procedure is as follows: control the driven wheel A (15-2-11) in the baffle switch device (15-2) to slide and attract along the wheel axle (15-2-13) to the magnetic area of ​​the driving wheel (15-2-10) with the built-in AC control magnetic area. At the same time, the shaft motor (15-2-14) controls the wheel axle and the driving wheel to rotate counterclockwise, so that the protruding point on the driven wheel A can be locked with the concave area of ​​the driving wheel with the built-in AC control magnetic area. The traction line (15-2-7) is then wound up. Returning to driven wheel A, this causes the L-shaped baffle (15-2-5) with its built-in spring to open outwards until it reaches a horizontal position. At this point, the driving wheel stops rotating, and the traction line stops retracting. Driven wheel B (15-2-12) slides along its axle to attract the magnetic area. Then, the driving wheel rotates counter-clockwise, causing the protruding point on driven wheel B to engage with the recessed area of ​​the driving wheel's built-in AC-controlled magnetic area. The traction line retracts to driven wheel B, causing the retraction spring to rotate until the magnetic ball baffle rotates parallel to the tube wall, stopping the driving wheel. Then, the AC current changes direction, pushing driven wheel A out of the driving wheel's slot. The L-shaped baffle with its built-in spring closes towards the baffle, thus locking the baffle and forming B and D. Two balls are held captive, while balls A and C are free. By controlling the frequency, the following situation is formed where balls A and C are held captive, while balls B and D are free. The magnetic zone (15-2-2) with DC current works throughout the process, ensuring that when the magnetic ball is in the induction phase of the induction zone, it is resisted by the attraction force when rotating to the magnetic zone, which facilitates the operation of the magnetic ball baffle. When the magnetic ball is in the induction phase of the non-induction zone, it is briefly attracted when rotating through the magnetic zone, and then leaves the attraction range due to the jet impulse being greater than the attraction force, resulting in a delay and making the flow rate change more obvious. By comprehensively utilizing the above cycle, the curved steel sheet (16) with magnetic balls (ABCD) connected around it rotates in two directions in the tube to control the flow rate. After being ejected at the high-pressure nozzle (15-4), it can form a pulsed jet with varying flow rate. A supercritical liquid nitrogen jet hard rock drilling device is provided according to the supercritical liquid nitrogen jet hard rock drilling method described above. The device comprises a drill bit (15), an external generator, and a drilling power unit. The drill bit mainly includes a heating casing (15-1), a baffle switch device (15-2), a nozzle oscillation device (15-3), a high-pressure nozzle (15-4), and a four-sided connecting... The device includes a curved steel sheet with magnetic balls (16); the external generating device mainly includes a liquid nitrogen tank (1), a water tank (2), a water pump (3), an electric heating element (4), a medium-pressure vessel (5), a heat-insulating and pressure-maintaining pipeline (6), and a liquid delivery pipe (7); the drilling power unit includes a sealing ring (8), a rotary water conveyor (9), a hydraulic drilling rig chuck (10), an electric pulley (11), a fixed pile (12), a wellhead sealing device (13), and a drill rod (14); the supercritical liquid nitrogen jet hard rock drilling device is characterized in that: The supercritical liquid nitrogen jet inside the drill bit is controlled by a mechanical pulse device, which is installed in each heat-insulating and pressure-maintaining pipe in the drill bit, adjacent to the nozzle. The mechanical pulse device consists of a curved steel sheet (16) with magnetic balls (ABCD) connected around the axis of the pipe and a baffle switch device (15-2) on the pipe wall. The magnetic area (15-2-2) and the sensing area (15-2-3) with DC current are surrounded by four magnetic ball baffles (15-2-1). The magnetic ball baffles are connected to the driven wheel B (15-2-12) through a traction line passing through the spring storage box (15-2-6). One end of the spring (15-2-4) One end is connected to the magnetic ball baffle, and the other end is connected to the spring storage box. The L-shaped baffle (15-2-5) with built-in torsion spring is located on the inner side of the tube wall and is connected to the traction line (15-2-7) on the driven wheel A (15-2-11). The two ends of the wheel axle (15-2-13) are fixed to a pair of opposing walls inside the baffle switch lock box (15-2-9). The driving wheel (15-2-10) with built-in AC control magnetic area is fixed in the center of the wheel axle. Driven wheel A and driven wheel B are connected in series on both sides. A shaft motor (15-2-14) is fixed at one end. The contact surface between the driven wheel and the shaft is coated with lubricant. The wire (15-2-8) connects the shaft motor and the various accessories of the sensing area. A portion of the high-temperature water jet inside the drill bit is controlled by a nozzle oscillation device (15-3) and ejected through a high-pressure nozzle. The nozzle oscillation device is located on the bifurcation pipe inside the fluid delivery tube of the drill bit, adjacent to the transverse nozzle, and consists of a double rocker mechanism and a rocker motor (15-3-1). In the double rocker mechanism, rocker A (15-3-2) is connected to the output shaft of the rocker motor, and rocker A (15-3-2) and rocker B (15-3-4) are connected by a connecting rod (15-3-3). The other portion of the high-temperature water jet is ejected from three high-pressure nozzles on the bifurcation pipe outside the fluid delivery tube of the drill bit. The heat-insulating and pressure-maintaining pipeline (6) connects the liquid nitrogen tank (1) and the rotary water conveyor (9), with a medium-pressure vessel (5) in between. The infusion pipe connects the water pump (3) and the rotary water conveyor. The initial junction of the rotary water conveyor with the heat-insulating and pressure-maintaining pipeline (6) and the infusion pipe is sealed by a sealing ring (8). The drill bit (15) is connected to the bottom of the drill rod (14) using a pipe thread connection. The hydraulic drilling rig chuck (10) is installed on the fixed pile (12) and is driven by the electric pulley (11) and the hydraulic drilling rig chuck (10) to rotate and advance the drill rod and drill bit.

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