Dual-power-system wire-line coring drilling tool and method for directional drilling of ultra-deep holes

Abstract

The invention discloses a dual-power-system wire-line coring drilling tool and method for directional drilling of an ultra-deep hole. The drilling tool comprises a straight drilling rod, a hollow motor, a force transmission pipe, a hollow motor, a flexible drilling rod, a drilling bit and a coring mechanism. The straight drill rod, the hollow motor, the force transmission pipe, the hollow motor, the flexible drill rod and the drill bit are all of hollow cylindrical structures and are sequentially communicated to form a channel for axial movement of the coring mechanism. One end of the straight drill rod is fixedly connected with the hollow motor, and the other end of the straight drill rod is a drilling machine connecting end; the hollow motor is in transmission connection with the hollow motor through the force transmission pipe, the hollow motor is in driving connection with the flexible drill rod, and the drill bit is fixedly connected with the flexible drill rod and can be driven by the hollow motor to rotate synchronously. The coring mechanism comprises a detachable coring pipe, and the coring pipe is located in the flexible drill rod. The coring pipe is a flexible coring pipe or a rigid coring pipe. The drilling tool is provided with two sets of power systems, and the drilling power can be effectively improved through coordination of the hollow motor and the hollow motor.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment for soil layers or rocks, in particular to a wireline coring drill with a dual power system for ultra-deep hole directional drilling and a wireline coring method for ultra-deep hole directional drilling. Background Art

[0002] Engineering drilling is the most commonly used exploration technique in engineering surveys and is widely applied in industries such as transportation, municipal engineering, water conservancy and hydropower. Currently, the commonly used engineering drilling techniques include vertical drilling, inclined drilling and horizontal drilling; vertical drilling and inclined drilling are most widely used due to their relatively low construction costs and relatively mature technical processes, but both vertical drilling and inclined drilling can only drill in a fixed direction and cannot change the drilling direction during the drilling process, resulting in certain limitations in the application fields; for example, in cross-riverbed exploration, when the borehole needs to cross the riverbed bottom from one bank of the river to the other bank, neither vertical drilling nor inclined drilling can be implemented. To solve the limitations of vertical drilling and inclined drilling, the research on directional drilling has been developed.

[0003] Currently, for directional drilling, the commonly adopted method is to set an eccentric mechanism on a rigid drill pipe, and apply an eccentric force to the rigid drill pipe through the eccentric mechanism to cause slight bending deformation of the rigid drill pipe, thereby obtaining a certain directional drilling ability. However, since the current directional drilling uses a hole-opening power drill to provide power for the drilling work, for ultra-deep hole drilling with a relatively deep drilling depth, as the drilling depth increases, the power transmission distance between the drill and the drill bit becomes longer and longer, and the power attenuation becomes more and more obvious. Moreover, during the drilling process, the drill pipe is continuously affected by the frictional force of the borehole wall, which will further lead to insufficient power provided by the drill. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a wireline coring drill with a dual power system for ultra-deep hole directional drilling that can effectively reduce the degree of power attenuation during drilling.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows: A wireline coring drill with a dual power system for ultra-deep hole directional drilling, including a straight drill pipe, a hollow motor, a force transmission pipe, a hollow motor, a flexible drill pipe, a drill bit and a coring mechanism. The straight drill pipe, the hollow motor, the force transmission pipe, the hollow motor, the flexible drill pipe and the drill bit are all hollow cylindrical structures and are sequentially connected to form a channel for the axial movement of the coring mechanism; one end of the straight drill pipe is fixedly connected to the hollow motor, and the other end of the straight drill pipe is the drill rig connection end; the hollow motor is drivingly connected to the hollow motor through the force transmission pipe, the hollow motor is drivingly connected to the flexible drill pipe, and the drill bit is fixedly connected to the flexible drill pipe and can rotate synchronously under the drive of the hollow motor; the coring mechanism includes a detachable coring pipe, and the coring pipe is located inside the flexible drill pipe; the coring pipe is a flexible coring pipe or a rigid coring pipe.

[0006] As an improvement of the above solution: The hollow motor includes a motor stator, a motor rotor and at least one connecting bearing. The motor stator is sleeved outside the motor rotor and fixedly connected to the straight drill pipe. The motor rotor forms a relative rotational fit with the motor stator through the connecting bearing. A plurality of turbine blades are fixedly arranged on the outer wall of the motor rotor. A gap communicating with the hollow part of the straight drill pipe is left between the motor stator and the motor rotor; The hollow motor includes an outer stator, an inner rotor and two rotating bearings. The outer stator is sleeved outside the inner rotor and fixedly connected to the motor stator through a connecting pipe. The inner rotor forms a relative rotational fit with the outer stator through the rotating bearing. The inner rotor is fixedly connected to the motor rotor through the force transmission pipe; The two rotating bearings are respectively arranged near both ends of the hollow motor, and a sealing ring for forming a sealing fit with the outer stator and the inner rotor is fixed at the outer end of the rotating bearing.

[0007] As an improvement of the above solution: It also includes a protection pipe sleeved outside the straight drill pipe. The protection pipe axially extends to cover the outside of the hollow motor and the hollow motor. A limit pipe is fixedly connected to the outer stator, and the limit pipe forms an axial limit fit with the end of the protection pipe; The force transmission pipe is fixedly connected to the inner rotor through an extension pipe, and a fixing groove for forming a snap fit with the coring mechanism is arranged on the inner wall of the extension pipe.

[0008] As an improvement of the above solution: The flexible drill pipe includes a spring pipe, a filling body, a steel ring hose, a first connector and a second connector; The spring pipe is a circular pipe structure formed by winding steel bars in a spiral shape. The filling body is a circular pipe structure formed by pouring flexible rubber on the inner and outer sides of the spring pipe. The steel ring hose is a circular pipe structure formed by integrally pouring flexible rubber and a plurality of axially arranged steel rings. The steel ring hose is coaxially arranged inside the filling body and abuts against the inner wall of the filling body; One end of the flexible drill pipe is fixedly connected to a connecting ring fixed at the end of the inner rotor through the first connector, and the other end of the flexible drill pipe is fixedly connected to the drill bit through the second connector.

[0009] As an improvement to the above solution: The coring mechanism further includes a fishing head, a guiding head, a fixing part, and a single rotator; one end of the fishing head is provided with a conical cap, the other end of the fishing head is fixedly connected to the fixing part, and a water-blocking plug that forms a sealing fit with the inner wall of the motor rotor is fixedly arranged at the connecting part between the fishing head and the fixing part; the fixing part is in snap-fit with the fixing groove; the single rotator is composed of two rotating monomers that are rotatably connected through a rotating shaft, one of the rotating monomers is fixedly connected to the fixing part, and the other rotating monomer is fixedly connected to the core barrel; one end of the guiding head is fixedly connected to the core barrel, the other end of the guiding head is a conical cut end, and the guiding head is in sliding fit with the channel for the axial movement of the coring mechanism through a guiding bearing.

[0010] As an improvement to the above solution: Two fixing lugs are arranged on the fixing part. One end of the two fixing lugs is rotatably connected to the fixing part through a fixing shaft. The other ends of the two fixing lugs expand to both sides and are inserted into the fixing groove to form a snap-fit, and the two fixing lugs are connected by a compression spring.

[0011] As an improvement to the above solution: It further includes an electronic chamber arranged between the single rotator and the core barrel; both ends of the electronic chamber are fixedly connected to the single rotator and the core barrel respectively; a three-dimensional positioning device is arranged in the electronic chamber; the electronic chamber is in sliding fit with the channel for the axial movement of the coring mechanism through a limiting bearing.

[0012] As an improvement to the above solution: The core barrel is a flexible core barrel. The flexible core barrel is a flexible circular tube structure formed by integrally casting flexible rubber and a plurality of axially arranged steel rings. An opening is arranged on the steel ring; both ends of the flexible core barrel form a radial limiting fit with the electronic chamber and the guiding head respectively through limiting cuts and are fixedly connected by bolts; the flexible core barrel bends and deforms synchronously with the flexible drill pipe when the flexible drill pipe is subjected to axial pressure.

[0013] As an improvement to the above solution: The core barrel is a rigid core barrel. The rigid core barrel is a rigid circular tube structure. Both ends of the rigid core barrel form a radial limiting fit with the electronic chamber and the guiding head respectively through limiting cuts and are fixedly connected by bolts; the rigid core barrel restricts the flexible drill pipe from bending and deforming when the flexible drill pipe is subjected to axial pressure.

[0014] The present invention also discloses a wireline coring method for ultra-deep hole directional drilling. Using the wireline coring drill with a dual-power system for ultra-deep hole directional drilling as described above, it is carried out according to the following steps: Step 1: Assemble the wireline coring drill with a dual-power system for ultra-deep hole directional drilling. Select a core barrel according to the drilling purpose required for the borehole and the characteristics of the borehole section. Use a flexible core barrel for directional drilling and a rigid core barrel for straight drilling. Step 2: Fix the straight drill pipe to the drill rig. Place the coring mechanism equipped with a rigid coring tube into the drill string through a fishing tool and fix it. Apply a vertical force to the straight drill pipe through the drill rig. Input drilling slurry at high pressure at the top of the drill string. Drive the hollow motor to rotate through the drilling slurry. At the same time, turn on the power supply of the hollow motor to make the hollow motor rotate synchronously with the hollow motor, driving the drill string to continuously drill straight into the rock formation. The core enters the rigid coring tube. When the core capacity in the rigid coring tube is about to reach the upper limit, stop the drilling work of the drill string. Use the fishing tool to fish out the coring mechanism and take out the core in the rigid coring tube; Step 3: Repeat the straight drilling work and coring work in Step 2, and increase the number of assembled straight drill pipes according to the change in drilling depth until straight drilling reaches the starting position of directional drilling; Step 4: Disassemble the rigid coring tube from the coring mechanism and replace it with a flexible coring tube; Step 5: Place the coring mechanism equipped with a flexible coring tube into the drill string through a fishing tool and fix it. Apply an eccentric force opposite to the predetermined drilling direction to the straight drill pipe through the drill rig, so that the flexible drill pipe and the flexible coring tube are synchronously bent and deformed in the direction of the designed trajectory curve. Input drilling slurry at high pressure at the top of the drill string. Drive the hollow motor to rotate through the drilling slurry. At the same time, turn on the power supply of the hollow motor to make the hollow motor rotate synchronously with the hollow motor, driving the drill string to continuously drill directionally and bend into the rock formation. The core enters the flexible coring tube. When the core capacity in the flexible coring tube is about to reach the upper limit, stop the drilling work of the drill string. Use the fishing tool to fish out the coring mechanism and take out the core in the flexible coring tube; Step 6: Repeat the directional drilling work and coring work in Step 5, and increase the number of assembled straight drill pipes according to the change in drilling depth until directional drilling reaches the predetermined directional bending target point; Step 7: Replace the flexible coring tube with a rigid coring tube, and repeat the straight drilling work and coring work in Step 2, and increase the number of assembled straight drill pipes according to the change in drilling depth until straight drilling reaches the predetermined depth; Step 8: Obtain the drilling trajectory of the drill string, analyze the actual drilling trajectory to determine the direction of directional drilling, compare the actual drilling trajectory curve with the designed drilling trajectory curve, determine the deviation direction and offset of the actual drilling trajectory, and correct the drilling direction; refer to the vertical profile of the actual drilling trajectory curve. If the drill bit in the actual drilling trajectory is above the drill bit in the designed drilling trajectory, reduce the eccentric force applied by the drilling rig. If the drill bit in the actual drilling trajectory is below the drill bit in the designed drilling trajectory, increase the eccentric force applied by the drilling rig; refer to the horizontal profile of the actual drilling trajectory curve. If the drill bit in the actual drilling trajectory is on the left side of the drill bit in the designed drilling trajectory, adjust the direction of the eccentric force applied by the drilling rig to the left. If the drill bit in the actual drilling trajectory is on the right side of the drill bit in the designed drilling trajectory, adjust the direction of the eccentric force applied by the drilling rig to the right; by adjusting the magnitude and direction of the eccentric force applied by the drilling rig, the actual drilling trajectory is restored to the designed drilling trajectory.

[0015] The beneficial effects of the present invention are as follows: 1. By configuring two sets of power systems, namely a hollow motor and a hollow motor, for the drill string, the flexible drill pipe and the drill bit are driven to rotate synchronously through the synchronous rotation of the two sets of power systems to achieve the drilling operation. The coordinated cooperation of the hollow motor and the hollow motor can effectively improve the drilling power and is more suitable for the ultra-deep hole drilling environment; 2. Both the hollow motor and the hollow motor, which are the drilling power components, are arranged close to the drill bit. The power system is connected to the drill bit through a flexible drill pipe, thus improving the existing orifice drilling power to bottom-hole drilling power. As the drilling depth increases, since the distance between the power system and the drill bit remains unchanged, there will be no obvious power attenuation, and it will not affect the core-taking mechanism's work of taking the core; 3. The rotation of the hollow motor in the present invention is driven by the drilling slurry injected under high pressure, and the hollow motor uses electric energy as the power. Although the injection pressure of the drilling slurry will weaken as the drilling depth increases, since the hollow motor and the hollow motor can jointly provide power for the drilling operation of the drill string through transmission connection, the hollow motor can supplement the weakened power of the hollow motor, ensuring that sufficient drilling power can be stably provided for the drill bit; 4. The present invention sets a coring mechanism inside the drill string, and forms a channel for the axial movement of the coring mechanism by connecting a straight drill pipe, a hollow motor, a force transmission pipe, a hollow motor, a flexible drill pipe, and a drill bit in sequence. During the drilling process, it will not affect the coring of the core by the coring mechanism, thus effectively improving the core sampling efficiency. The coring mechanism of the present invention can be selectively configured with a flexible coring pipe or a rigid coring pipe, and can select the corresponding coring pipe according to the characteristics of the borehole section during the drilling process, so that the core sampling work can be adapted to the drilling work. The flexible coring pipe can adjust its own bending posture along with the drilling posture of the drill string during directional drilling, while the rigid coring pipe can limit the bending deformation of the flexible drill pipe during straight drilling, thereby effectively improving the applicability of directional drilling work. 5. The present invention configures a flexible drill pipe between the straight drill pipe and the drill bit. The flexible drill pipe has the characteristic of being completely deformable. When the pressure applied by the hole-opening drill rig is transmitted from the straight drill pipe to the flexible drill pipe, the flexible drill pipe will produce corresponding bending deformation, and under the action of different pressures of the hole-opening drill rig, the degree of bending deformation of the flexible drill pipe is different. Therefore, the present invention can have a wider range of build-up angles and can be applied to directional drilling construction with different build-up angle requirements, effectively improving the build-up efficiency and drilling efficiency of directional drilling. 6. The present invention can obtain the spatial trajectory of the drill string in the whole drilling process in real time, so as to guide the direction of the drill string during directional bending drilling in real time, and correct the drilling direction through the obtained spatial trajectory. It has the function of measuring the trajectory while drilling, and the control of the drilling trajectory is relatively convenient, and the drilling efficiency is improved by ensuring the accuracy of the drilling trajectory. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a sectional view structure diagram of the present invention in the natural state; Figure 2 It is a sectional view structure diagram of the present invention in the directional drilling state; Figure 3 It is a sectional view structure diagram of the present invention in the straight drilling state; Figure 4 It is a structure schematic diagram of the present invention without installing the coring mechanism; Figure 5 It is a structure schematic diagram of the flexible drill pipe in the present invention; Figure 6 is Figure 1 the sectional view at A-A in Figure 7 is Figure 1 the sectional view at B-B in

[0017] The labels in the figure are: 100 - straight drill pipe, 200 - hollow motor, 210 - motor stator, 220 - motor rotor, 310 - force transmission pipe, 320 - protection pipe, 330 - limit pipe, 340 - extension pipe, 350 - connecting pipe, 360 - connecting ring, 400 - hollow motor, 410 - outer stator, 420 - inner rotor, 430 - rotating bearing, 440 - sealing ring, 500 - flexible drill pipe, 510 - spring pipe, 520 - filling body, 530 - steel ring hose, 540 - first connector, 550 - second connector, 600 - drill bit, 700 - coring mechanism, 710 - coring pipe, 720 - fishing head, 730 - guiding head, 740 - fixing part, 750 - single rotator, 760 - water blocking plug, 770 - fixing ear, 780 - guiding bearing, 790 - limit bearing, 800 - electronic compartment. Detailed implementation manner

[0018] For the convenience of understanding the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0020] Such as Figures 1 to 3As shown in the figure, the wireline coring drill with a dual-power system for ultra-deep hole directional drilling disclosed by the present invention includes a straight drill pipe 100, a dual-power system, a flexible drill pipe 500, a drill bit 600, and a coring mechanism 700; the dual-power system includes a hollow motor 200, a force transmission pipe 310, and a hollow motor 400. The straight drill pipe 100 is used to connect with a drill rig at the borehole orifice. The drill rig applies pressure to the straight drill pipe 100 and transmits it downward through the straight drill pipe 100. The length of the drill can also be extended by increasing the number of straight drill pipes 100 and connecting them. The dual-power system, as a power component for drilling operations, provides power for the drilling of the drill by the dual-power system, and by arranging the dual-power system near the bottom end of the drill bit 600 of the drill, the solution in the prior art where the power component is located at the borehole orifice is improved to arrange the power component near the bottom of the hole. The distance between the dual-power system as the power component and the drill bit 600 remains unchanged. The hollow motor 200 and the hollow motor 400 in the dual-power system adopt different power sources respectively. The hollow motor 200 is driven by the drilling slurry injected under high pressure, and the hollow motor 400 is driven by electric energy. The force transmission pipe 310 drives and connects the hollow motor 200 and the hollow motor 400 of the dual-power system to simultaneously aggregate the torques of the hollow motor 200 and the hollow motor 400 and enhance the drilling power of the drill. The flexible drill pipe 500 rotates under the combined drive of the hollow motor 200 and the hollow motor 400 and drives the drill bit 600 to rotate synchronously; and the flexible drill pipe 500 can be bent and deformed when subjected to an upward acting force, and the flexible drill pipe 500 bends correspondingly according to the magnitude of the acting force received, so as to obtain an appropriate inclination angle. The drill bit 600 cuts the rock of the borehole through its own rotation, enabling the drill to continuously drill deeper. In the present invention, the straight drill pipe 100, the hollow motor 200, the force transmission pipe 310, the hollow motor 400, the flexible drill pipe 500, and the drill bit 600 are all set as hollow cylindrical structures, and the hollow parts of the above components are connected axially to form a channel for the axial movement of the coring mechanism 700. The coring mechanism 700 realizes the taking of the core through axial movement in this channel; the coring mechanism 700 is equipped with a detachable core tube 710, and the core is taken and stored through the core tube 710 during the drilling process of the drill.

[0021] Specifically, as Figures 1 to 4As shown, the straight drill pipe 100 in the present invention is of a hollow cylindrical structure. The hollow part of the straight drill pipe 100 serves as a component of the moving channel of the coring mechanism 700. In addition, the hollow part of the straight drill pipe 100 can also provide a flow channel for the drilling slurry injected into the hollow motor 200. One end of the straight drill pipe 100 is threadedly connected to the hollow motor 200, and the other end of the straight drill pipe 100 is the drill rig connection end. The straight drill pipe 100 can be threadedly connected to the orifice drill rig through the drill rig connection end, or can be threadedly connected to other straight drill pipes 100 through the drill rig connection end. As the drilling depth increases, the number of connected straight drill pipes 100 can be increased, and multiple straight drill pipes 100 can be threadedly connected in sequence, all the way from the bottom position of the borehole to the orifice drill rig located at the surface drill hole, so as to adapt to the drilling depth by extending the length of the entire drill string. The straight drill pipe 100 is of a rigid structure. The straight drill pipe 100 can directly bear the drilling pressure and eccentric force exerted by the orifice drill rig, and the straight drill pipe 100, as a force transmission component, transmits the action exerted by the orifice drill rig downward.

[0022] Specifically, as Figures 1 to 4 shown, the dual power system in the present invention includes a hollow motor 200 and a hollow motor 400, and a transmission cooperation is formed between the hollow motor 200 and the hollow motor 400 through a force transmission pipe 310.

[0023] The hollow motor 200 consists of a motor stator 210, a motor rotor 220 and a connecting bearing. The motor stator 210 and the motor rotor 220 are hollow cylindrical structures with different size specifications. The hollow motor 200 is arranged between the straight drill pipe 100 and the force transmission pipe 310. The motor stator 210 is sleeved outside the motor rotor 220. A threaded interface is provided on the inner side of the upper end of the motor stator 210, and it is threadedly connected to the upper straight drill pipe 100 through the threaded interface at the upper end. A threaded interface is provided on the outer side of the lower end of the motor stator 210, and it is threadedly connected to the connecting pipe 350 through the threaded interface. The motor rotor 220 is located inside the motor stator 210. A threaded interface is provided on the outer side of the lower end of the motor rotor 220, and it can be threadedly connected to the force transmission pipe 310 through the threaded interface at the lower end. The upper end of the motor rotor 220 is a free end. There is a clearance fit between the motor stator 210 and the motor rotor 220, and relative rotational fit is achieved through the connecting bearing. The connecting bearing is sleeved on the outer wall of the motor rotor 220. The inner ring of the connecting bearing is fixedly connected to the motor rotor 220, and the outer ring of the connecting bearing is fixedly connected to the motor stator 210. A plurality of turbine blades are fixedly arranged on the outer wall of the motor rotor 220. The clearance between the motor stator 210 and the motor rotor 220 communicates with the hollow part of the upper straight drill pipe 100. The drilling fluid injected downward through the straight drill pipe 100 can flow into the clearance between the motor stator 210 and the motor rotor 220, and then drive the turbine blades fixed on the outer wall of the motor rotor 220 to rotate through the flow of the drilling fluid from the inlet to the outlet, thereby driving the motor rotor 220 to rotate. The motor rotor 220 then transmits the rotational torque downward through the force transmission pipe 310.

[0024] The hollow motor 400 is composed of an outer stator 410, an inner rotor 420, and two rotating bearings 430. The outer stator 410 and the inner rotor 420 are hollow cylindrical structures with different size specifications. The hollow motor 400 receives the rotational torque transmitted by the operation of the hollow motor 200 through the force transmission pipe 310, increases the torque through its own rotation, and then transmits it downward to the flexible drill pipe 500. The outer stator 410 is sleeved outside the inner rotor 420. The upper end of the outer stator 410 is threadedly connected to the motor stator 210 of the upper hollow motor 200 through the connecting pipe 350, and the upper end of the inner rotor 420 is threadedly connected to the motor rotor 220 of the upper hollow motor 200 through the force transmission pipe 310. There is a clearance fit between the outer stator 410 and the inner rotor 420, and the relative rotational fit is realized through the rotating bearings 430. The rotating bearings 430 are sleeved on the outer wall of the inner rotor 420. The inner ring of the rotating bearing 430 is fixedly connected to the inner rotor 420, and the outer ring of the rotating bearing 430 is fixedly connected to the outer stator 410. The two rotating bearings 430 are respectively arranged near both ends of the hollow motor 400, and a space for accommodating the electrical components of the hollow motor 400, including motor magnets and coils, is formed between the two rotating bearings 430. In order to protect the electrical components of the hollow motor 400, the present invention also fixedly sets sealing rings 440 at the outer ends of the two rotating bearings 430. The sealing rings 440 are closely attached to both the inner wall of the outer stator 410 and the outer wall of the inner rotor 420 to form a sealing fit, sealing the gap between the outer stator 410 and the inner rotor 420, and preventing groundwater from entering and causing damage to the hollow motor 400; enabling the hollow motor 400 to have a waterproof function and be able to operate normally in the groundwater environment with a relatively high water head.

[0025] The dual power system adopted in the present invention can increase the drilling power of the drill tool, and can supplement the power of the hollow motor 200 through the operation of the hollow motor 400 when the drilling slurry that cannot provide sufficient pressure for the hollow motor 200 due to the relatively deep drilling depth in the ultra-deep hole drilling work, ensuring that a stable drilling power can always be provided for the drill tool.

[0026] Since the working environment in the borehole is complex and there are a lot of cuttings or groundwater, it is easy to damage the dual power system of the present invention. To solve the above problems, as Figures 1 to 4As shown in the figure, the present invention provides a protection tube 320 to protect the dual-power system. The protection tube 320 is a hollow circular tube made of wear-resistant plastic. The upper end of the protection tube 320 is sleeved outside the straight drill pipe 100, and the lower end of the protection tube 320 axially extends downward to the outside of the hollow motor 400, enclosing both the hollow motor 200 and the hollow motor 400. A limiting tube 330 is fixed on the outer stator 410. The limiting tube 330 is a hollow cylindrical structure. The limiting tube 330 is fixedly connected to the lower end of the outer stator 410 of the hollow motor 400, and the outer diameter of the limiting tube 330 is larger than that of the outer stator 410, so that the limiting tube 330 radially protrudes to the outside of the outer stator 410. An inclined cut is provided at the upper end of the limiting tube 330, and at the same time, a matching inclined cut is provided at the lower end of the protection tube 320, so as to form an axial limiting fit of the protection tube 320 by the limiting tube 330. In addition to limiting and fixing the protection tube 320, the limiting tube 330 can also protect the lower part of the hollow motor 400 to prevent impurities such as cuttings and gravel from entering the hollow motor 400. By providing the protection tube 320 to form a protective layer outside the dual-power system, the present invention can avoid the wear caused by the contact between the drill tool and the borehole wall during the drilling process. Since the number of straight drill pipes 100 will be continuously increased to extend the overall length of the drill tool as the drilling depth increases, correspondingly, the number of protection tubes 320 can be increased, and multiple protection tubes 320 are axially extended outside the drill tool and assembled by means of snap connection or bolt connection.

[0027] In addition, an extension tube 340 is provided between the force transmission tube 310 and the inner rotor 420. The extension tube 340 is a hollow cylindrical structure. A threaded interface is provided on the inner side of the upper end of the extension tube 340, and it is threadedly connected to the force transmission tube 310 through the threaded interface at the upper end. The lower end surface of the extension tube 340 is directly fixedly connected to the upper end surface of the inner rotor 420. Fixed grooves are provided on the inner wall of the extension tube 340, and by providing the fixed grooves, a snap fit can be formed with the coring mechanism 700 to realize the fixation of the coring mechanism 700 in the channel.

[0028] Specifically, such as Figures 1 to 4 and Figure 5 、 Figure 7As shown in the figure, the flexible drill pipe 500 in the present invention is composed of a spring tube 510, a filling body 520, a steel ring hose 530, a first connector 540, and a second connector 550. The spring tube 510 is a circular tube structure formed by winding steel bars in a spiral shape. The steel bars used to prepare the spring tube 510 can be circular steel bars or square steel bars. In the present invention, the spring tube 510 is used as the skeleton structure of the flexible drill pipe 500. The flexible drill pipe 500 can have flexibility through the spring tube 510. After receiving the axial force transmitted from above, the spring tube 510 in the flexible drill pipe 500 will bend and deform, driving the overall bending of the flexible drill pipe 500, thereby providing sufficient hole deviation amplitude for the drill tool and realizing the directional bending drilling of the drill tool. The filling body 520 is a flexible circular tube structure obtained by pouring flexible wear-resistant rubber on the inner and outer sides of the spring tube 510 to fill the gaps. By pouring the filling body 520, the flexible drill pipe 500 becomes an integral structure, and the outer wall of the flexible drill pipe 500 can be a straight and smooth surface, which can effectively reduce the wear of the hole wall of the drill hole on the flexible drill pipe 500. In the present invention, the inner wall of the flexible drill pipe 500 is filled by setting the steel ring hose 530; the steel ring hose 530 is a circular tube structure formed by integrally pouring flexible rubber and a plurality of axially arranged steel rings, that is, a plurality of steel rings are arranged axially at intervals in sequence, and then the gaps between the steel rings are filled by pouring flexible wear-resistant rubber to obtain the steel ring hose 530. The outer diameter of the steel ring hose 530 is adapted to the inner diameter of the spring tube 510 so that the steel ring hose 530 can be closely attached to the spring tube 510; when the spring tube 510 bends and deforms, the adjacent parts of the spring tube 510 will open. Due to the setting of the steel ring hose 530, the steel rings in the steel ring hose 530 will not deform due to the axial arrangement, and the diameter of the steel rings remains unchanged. When the spring tube 510 bends, the steel ring hose 530 remains attached to the spring tube 510, so it will not have a deformation effect on the inner coring tube 710.

[0029] Both the first connector 540 and the second connector 550 of the flexible drill pipe 500 are hollow cylindrical structures. A tapered thread interface is provided on the inner side of the upper end of the first connector 540, and a tapered thread interface is provided on the outer side of the lower end of the second connector 550; both ends of the spring tube 510 are welded to the first connector 540 and the second connector 550 respectively. One end of the flexible drill pipe 500 is threadedly connected to the connecting ring 360 fixed to the lower end of the inner rotor 420 through the first connector 540, and the other end of the flexible drill pipe 500 is threadedly connected to the drill bit 600 through the second connector 550. The upper and lower ends of the steel ring hose 530 are fixedly connected to the first connector 540 and the second connector 550 respectively.

[0030] Specifically, as Figures 1 to 3 shown in the figure, in addition to the coring tube 710, the coring mechanism 700 in the present invention further includes a fishing head 720, a guide head 730, a fixing part 740, and a single swivel 750.

[0031] The fishing head 720 of the coring mechanism 700 is used to connect with the fishing device. The fishing device can connect the coring mechanism 700 by fixing and releasing the fishing head 720. After the fishing device is connected with the fishing head 720, the coring mechanism 700 can be fished out to extract the core, and the coring mechanism 700 can also be lowered into the drilling tool through the fishing device. A conical cap is provided at one end of the fishing head 720, and the other end of the fishing head 720 is welded and fixed to the fixing part 740 through a round tube or other connecting parts. A cap is also fixed on the connecting part between the fishing head 720 and the fixing part 740. A water-blocking plug 760 is provided, and the water-blocking plug 760 adopts a flexible rubber sealing ring. The water-blocking plug 760 is in close contact with the inner wall of the motor rotor 220 of the hollow motor 200 to form a sealing fit. The water-blocking plug 760 can seal and isolate the inner wall of the motor rotor 220, so that the drilling slurry flowing out of the channel of the straight drill rod 100 cannot enter under the water-blocking plug 760, but can only flow into the gap between the motor rotor 220 and the motor stator 210, so as to ensure that the drilling slurry is transported to drive the motor rotor 220, and ensure the operation of the hollow motor 200.

[0032] The guide head 730 of the coring mechanism 700 is used to guide the movement of the coring mechanism 700 in the channel. One end of the guide head 730 is threadedly connected to the bottom end of the core tube 710 through a circular tubular guide tube with a tapered threaded interface, and the other end of the guide head 730 is a tapered cut end with a tapered cut. The tapered cut end of the guide head 730 can reduce the contact between the guide head 730 and the drill bit, so that the guide head 730 can more easily drive the entire core mechanism 700 to move in the drill bit; in addition, a guide bearing 780 is fixed to the outside of the guide head 730, and a ball is arranged on the outside of the guide bearing 780. The ball of the guide bearing 780 is slidably matched with the channel for axial movement of the core mechanism 700. The guide bearing 780 can limit the movement of the guide head 730 in the channel to ensure smooth movement of the guide head 730, and the guide bearing 780 can be provided to enable the guide head 730 to form a relative rotation fit with the external mechanism to avoid synchronous rotation of the guide head 730 and the external mechanism.

[0033] The fixing part 740 of the coring mechanism 700 is used to fix the coring mechanism 700 inside the drill string. One end of the fixing part 740 is fixedly welded to the fishing head 720 through a connecting component, and the other end of the fixing part 740 is threadedly connected to the single-rotator 750. Two fixing lugs 770 are arranged on the fixing part 740. One end of the two fixing lugs 770 is rotatably connected to the fixing part 740 through a fixing shaft, and the other ends of the two fixing lugs 770 extend to both sides of the fixing part 740. A fixing groove is provided on the inner wall of the extension pipe 340. The extended ends of the two fixing lugs 770 can be inserted into the fixing groove to be snap-fitted with the fixing groove, so as to realize the fixation of the fixing part 740 and the entire coring mechanism 700 inside the drill string. A compression spring is also connected between the two fixing lugs 770. The elastic force of the compression spring is used to apply a pressing force to the two fixing lugs 770 to press the two fixing lugs 770 in the fixing groove; when the coring mechanism 700 needs to be fished, the fishing device lifts the entire coring mechanism 700 through the fishing head 720. The fixing lugs 770 are pulled upward and contract inward to compress the compression spring. The compression spring is compressed, and the fixing lugs 770 are disengaged from the fixing groove.

[0034] The single-rotator 750 of the coring mechanism 700 is composed of two rotating monomers. The two rotating monomers are connected by a rotating shaft to form a relative rotation fit. A conical thread interface is provided at the top of the upper rotating monomer, and a conical thread interface is provided at the bottom of the lower rotating monomer. The two rotating monomers are respectively threadedly connected to the fixing part 740 and the core barrel 710. As Figure 7 shown, the single-rotator 750 is located inside the hollow motor 400. Since the two rotating monomers of the single-rotator 750 can rotate relative to each other, the rotation of the two rotating monomers is independent, ensuring that when the upper rotating monomer connected to the fixing part 740 rotates, the lower rotating monomer connected to the core barrel 710 will not rotate. It avoids the wear of the core in the core barrel caused by rotation, especially the wear of the core structural plane.

[0035] Further, as Figures 1 to 3As shown in the figure, an electronic bin 800 is further provided in the coring mechanism 700 of the present invention. The electronic bin 800 is arranged between the single rotator 750 and the coring tube 710. A three-dimensional positioning device is installed in the electronic bin 800 through an electronic device installation space. The electronic bin 800 is of a cylindrical structure, and the electronic device installation space is located in the middle of the electronic bin 800. The inner side of the upper end of the electronic bin 800 is provided with a tapered thread interface and is threadedly connected to the lower rotating unit of the single rotator 750. The lower end of the electronic bin 800 is provided with a right-angle notch and forms a radial limit fit with the coring tube 710 and is fixedly connected by bolts. The three-dimensional positioning device installed in the electronic bin 800 can position the three-dimensional space coordinates of the drill tool during the drilling operation to obtain the drilling trajectory of the drill tool, and has the function of positioning the trajectory while drilling. By analyzing the drilling trajectory, the direction of directional bending drilling can be determined in real time. By comparing with the designed drilling trajectory, the deviation direction and offset amount of the actual drilling trajectory can be known, so that the drilling direction can be corrected in time. In addition, a limit bearing 790 is fixedly installed on the outer wall of the electronic bin 800, and there are balls outside the limit bearing 790. The limit bearing 790 and the guide bearing 780 installed on the guide head 730 play the same role. The movement of the coring mechanism 700 in the drill tool is limited by the limit bearing 790, and the smooth movement of the coring mechanism 700 is ensured. The relative rotational fit between the electronic bin 800 and the external mechanism can be formed by setting the limit bearing 790 to prevent the synchronous rotation of the electronic bin 800.

[0036] In the present invention, the coring tube 710 configured in the coring mechanism 700 can be disassembled and replaced. The coring tube 710 includes a flexible coring tube and a rigid coring tube, and different coring tubes can be selected according to the characteristics of different drilling sections during the drilling process. The flexible coring tube is used for directional drilling, and the rigid coring tube is used for straight drilling.

[0037] As Figure 1 and Figure 2As shown, the coring tube 710 adopts a flexible coring tube. The skeleton structure of the flexible coring tube is a hollow circular tube structure integrally cast by flexible wear-resistant material and multiple steel rings arranged at intervals along the axial direction. The steel ring is provided with an opening to enable the steel ring to produce a certain amount of deformation. The two ends of the flexible coring tube are respectively in radial limit fit with the electronic bin 800 and the guide head 730 through the limit cuts and are fixedly connected by bolts. By setting the steel ring with an opening, when the core is stored in the flexible coring tube, the opening of the steel ring can open to cause a certain amount of deformation of the steel ring. Especially during directional bending drilling, the taken core is in a bent shape. At this time, the self-adaptive deformation ability of the steel ring can be used to avoid the core from being squeezed or worn; in addition, the steel ring has a certain strength and can also improve the grasping force on the core through its own deformation, thereby clamping the core. The flexible wear-resistant rubber used for casting the flexible coring tube can produce a certain amount of expansion deformation, and can cooperate with the steel ring to deform the flexible coring tube and the flexible drill pipe 500 together when the flexible drill pipe 500 is subjected to axial pressure, and can return to its original state under the action of its own elastic force subsequently.

[0038] As Figure 3 shown, the coring tube 710 adopts a rigid coring tube. The rigid coring tube is a rigid circular tube structure that cannot produce bending deformation. The two ends of the rigid coring tube are respectively in radial limit fit with the electronic bin 800 and the guide head 730 through the limit cuts and are fixedly connected by bolts. Since the rigid coring tube cannot produce bending deformation, during straight drilling, the rigid coring tube can limit the bending deformation of the flexible drill pipe 500 when the flexible drill pipe 500 is subjected to axial pressure by its own rigidity, ensuring that the flexible drill pipe 500 remains in a straight state.

[0039] The present invention also discloses a wireline coring method for ultra-deep hole directional drilling, which uses the double-power wireline coring drill for ultra-deep hole directional drilling as described above and is carried out according to the following steps: Step 1: Assemble the double-power system wireline coring drill for ultra-deep hole directional drilling, select different coring tubes 710 according to the drilling purpose required by the borehole and the characteristics of the borehole section, use the flexible coring tube during directional drilling, and use the rigid coring tube during straight drilling; generally, the designed trajectory curve is to first carry out inclined hole straight drilling, and after drilling to a certain depth according to the drilling object, then carry out directional drilling. When the directional drilling reaches the predetermined directional bending target point, then continue to carry out straight drilling to reach the designed predetermined position; Step 2: Fix the straight drill pipe 100 to the drill rig. Place the coring mechanism 700 equipped with a rigid coring tube inside the drill tool through a fishing tool and fix it. Apply a vertical force to the straight drill pipe 100 through the drill rig. Input drilling slurry at high pressure at the top of the drill tool. Drive the hollow motor 200 to rotate through the drilling slurry. At the same time, connect the power supply of the hollow motor 400 to make the hollow motor 400 rotate synchronously with the hollow motor 200, driving the drill tool to continuously drill straight into the rock formation. The core enters the rigid coring tube. When the core capacity in the rigid coring tube is about to reach the upper limit, stop applying drilling pressure and inputting drilling slurry to the hollow motor 200, and cut off the power supply to the hollow motor 400 at the same time to stop the drilling work of the drill tool. Fish out the coring mechanism through the fishing tool and take out the core in the rigid coring tube; Step 3: Repeat the straight drilling work and coring work in Step 2, and increase the number of assembled straight drill pipes 100 according to the change of drilling depth until straight drilling reaches the starting position of directional drilling; Step 4: Disassemble the rigid coring tube from the coring mechanism 700 and replace it with a flexible coring tube; Step 5: Place the coring mechanism equipped with the flexible coring tube inside the drill tool through the fishing tool and fix it. Apply an eccentric force opposite to the predetermined drilling direction to the straight drill pipe 100 through the drill rig, so that the flexible drill pipe and the flexible coring tube are synchronously bent and deformed in the direction of the designed trajectory curve. Input drilling slurry at high pressure at the top of the drill tool. Drive the hollow motor 200 to rotate through the drilling slurry. At the same time, connect the power supply of the hollow motor 400 to make the hollow motor 400 rotate synchronously with the hollow motor 200, driving the drill tool to continuously drill in a directional and curved manner into the rock formation. The core enters the flexible coring tube. When the core capacity in the flexible coring tube is about to reach the upper limit, stop applying drilling pressure and inputting drilling slurry to the hollow motor 200, and cut off the power supply to the hollow motor 400 at the same time to stop the drilling work of the drill tool. Fish out the coring mechanism through the fishing tool and take out the core in the flexible coring tube; Step 6: Repeat the directional drilling work and coring work in Step 5, and increase the number of assembled straight drill pipes 100 according to the change of drilling depth until directional drilling reaches the predetermined directional bending target point; Step 7: Replace the flexible coring tube with a rigid coring tube, and repeat the straight drilling work and coring work in Step 2, and increase the number of assembled straight drill pipes 100 according to the change of drilling depth until straight drilling reaches the predetermined depth; Step 8: Obtain the drilling trajectory of the drill string through the three-dimensional positioning device installed in the electronic warehouse 800, analyze the actual drilling trajectory and determine the direction of directional drilling. Compare the actual drilling trajectory curve with the designed drilling trajectory curve to determine the deviation direction and offset of the actual drilling trajectory, and correct the drilling direction. Refer to the vertical profile of the actual drilling trajectory curve. If the drill bit in the actual drilling trajectory is above the drill bit in the designed drilling trajectory, reduce the eccentric force applied by the drill rig. If the drill bit in the actual drilling trajectory is below the drill bit in the designed drilling trajectory, increase the eccentric force applied by the drill rig. Refer to the horizontal profile of the actual drilling trajectory curve. If the drill bit in the actual drilling trajectory is on the left side of the drill bit in the designed drilling trajectory, adjust the direction of the eccentric force applied by the drill rig to the left. If the drill bit in the actual drilling trajectory is on the right side of the drill bit in the designed drilling trajectory, adjust the direction of the eccentric force applied by the drill rig to the right. By adjusting the magnitude and direction of the eccentric force applied by the drill rig, make the actual drilling trajectory return to the designed drilling trajectory.

Claims

1. Wireline coring drill with dual power systems for ultra-deep directional drilling, characterized in that: It includes a straight drill pipe (100), a hollow motor (200), a force transmission pipe (310), a hollow motor (400), a flexible drill pipe (500), a drill bit (600) and a coring mechanism (700). The straight drill pipe (100), the hollow motor (200), the force transmission pipe (310), the hollow motor (400), the flexible drill pipe (500) and the drill bit (600) are all of hollow cylindrical structures and are connected in sequence to form a channel for the axial movement of the coring mechanism (700). One end of the straight drill pipe (100) is fixedly connected to the hollow motor (200), and the other end of the straight drill pipe (100) is the drill rig connection end. The hollow motor (200) is drivingly connected to the hollow motor (400) through the force transmission pipe (310). The hollow motor (400) is drivingly connected to the flexible drill pipe (500). The drill bit (600) is fixedly connected to the flexible drill pipe (500) and can rotate synchronously under the drive of the hollow motor (400). The coring mechanism (700) includes a detachable coring pipe (710), and the coring pipe (710) is located inside the flexible drill pipe (500). The coring pipe (710) is a flexible coring pipe or a rigid coring pipe.

2. The wireline coring drill with a dual power system for ultra-deep hole directional drilling according to claim 1, characterized in that: The hollow motor (200) includes a motor stator (210), a motor rotor (220) and at least one connecting bearing. The motor stator (210) is sleeved outside the motor rotor (220) and is fixedly connected to the straight drill pipe (100). The motor rotor (220) forms a relative rotational fit with the motor stator (210) through the connecting bearing. A plurality of turbine blades are fixedly arranged on the outer wall of the motor rotor (220). A gap communicating with the hollow part of the straight drill pipe (100) is left between the motor stator (210) and the motor rotor (220). The hollow motor (400) includes an outer stator (410), an inner rotor (420) and two rotating bearings (430). The outer stator (410) is sleeved outside the inner rotor (420) and is fixedly connected to the motor stator (210) through a connecting pipe (350). The inner rotor (420) forms a relative rotational fit with the outer stator (410) through the rotating bearing (430). The inner rotor (420) is fixedly connected to the motor rotor (220) through the force transmission pipe (310). The two rotating bearings (430) are respectively arranged near both ends of the hollow motor (400). A sealing ring (440) that forms a sealing fit with the outer stator (410) and the inner rotor (420) is fixed at the outer end of the rotating bearing (430).

3. The wireline coring drill with a dual power system for ultra-deep hole directional drilling according to claim 2, characterized in that: It further includes a protection pipe (320) sleeved outside the straight drill pipe (100). The protection pipe (320) axially extends to cover the outside of the hollow motor (200) and the hollow motor (400). A limit pipe (330) is fixedly connected to the outer stator (410), and the limit pipe (330) forms an axial limit fit with the end of the protection pipe (320). The force transmission pipe (310) is fixedly connected to the inner rotor (420) through an extension pipe (340), and a fixing groove that forms a snap fit with the coring mechanism (700) is provided on the inner wall of the extension pipe (340).

4. The wireline coring drill with a dual power system for ultra-deep hole directional drilling according to claim 2, wherein: The flexible drill pipe (500) includes a spring tube (510), a filling body (520), a steel-ring hose (530), a first connector (540) and a second connector; the spring tube (510) is a circular tube structure formed by helically winding steel bars, the filling body (520) is a circular tube structure formed by pouring flexible rubber on the inner and outer sides of the spring tube (510), the steel-ring hose (530) is a circular tube structure formed by integrally pouring flexible rubber and a plurality of axially arranged steel rings, the steel-ring hose (530) is coaxially arranged inside the filling body (520) and abuts against the inner wall of the filling body (520); one end of the flexible drill pipe (500) is fixedly connected to a connecting ring (360) fixed at the end of the inner rotor (420) through the first connector (540), and the other end of the flexible drill pipe (500) is fixedly connected to the drill bit (600) through the second connector (550).

5. The wireline coring drill with a dual power system for ultra-deep hole directional drilling according to claim 3, characterized in that: The coring mechanism (700) further includes a fishing head (720), a guiding head (730), a fixing part (740) and a single-rotator (750); one end of the fishing head (720) is provided with a conical cap, the other end of the fishing head is fixedly connected to the fixing part (740), and a water-blocking plug (760) that forms a sealing fit with the inner wall of the motor rotor (220) is fixedly arranged at the connecting part between the fishing head (720) and the fixing part (740); the fixing part (740) is in snap-fit with the fixing groove; the single-rotator (750) is composed of two rotating monomers rotatably connected by a rotating shaft, one of the rotating monomers is fixedly connected to the fixing part (740), and the other rotating monomer is fixedly connected to the coring tube (710); one end of the guiding head (730) is fixedly connected to the coring tube (710), the other end of the guiding head (730) is a conical cutting end, and the guiding head (730) is slidably fitted with the axial movement channel of the coring mechanism (700) through a guiding bearing (780).

6. The wireline coring drill with a dual power system for ultra-deep hole directional drilling according to claim 5, characterized in that: Two fixing lugs (770) are arranged on the fixing part (740), one ends of the two fixing lugs (770) are rotatably connected to the fixing part (740) through a fixing shaft, the other ends of the two fixing lugs (770) expand to both sides and are inserted into the fixing groove to form a snap-fit, and the two fixing lugs (770) are connected by a compression spring.

7. The wireline coring drill with a dual power system for ultra-deep hole directional drilling according to claim 5, characterized in that: It further includes an electronic bin (800) arranged between the single-rotator (750) and the coring tube (710); both ends of the electronic bin (800) are fixedly connected to the single-rotator (750) and the coring tube (710) respectively; a three-dimensional positioning device is arranged in the electronic bin (800); the electronic bin (800) is slidably fitted with the axial movement channel of the coring mechanism (700) through a limiting bearing (790).

8. The wireline coring drill with a dual power system for ultra-deep hole directional drilling according to claim 7, characterized in that: The coring tube (710) is a flexible coring tube, which is a flexible circular tube structure formed by integrally casting flexible rubber and a plurality of axially arranged steel rings. An opening is provided on the steel ring; both ends of the flexible coring tube form a radial limiting fit with the electronic bin (800) and the guide head (730) respectively through limiting cuts and are fixedly connected by bolts; when the flexible drill pipe (500) is subjected to axial pressure, the flexible coring tube bends and deforms synchronously with the flexible drill pipe (500).

9. The wireline coring drill with a dual power system for ultra-deep hole directional drilling according to claim 7, wherein: The coring tube (710) is a rigid coring tube, which is a rigid circular tube structure. Both ends of the rigid coring tube form a radial limiting fit with the electronic bin (800) and the guide head (730) respectively through limiting cuts and are fixedly connected by bolts; when the flexible drill pipe (500) is subjected to axial pressure, the rigid coring tube restricts the flexible drill pipe (500) from bending and deforming.

10. Wireline coring method for ultra-deep hole directional drilling, characterized in that: The wireline coring drill with a dual power system for ultra-deep hole directional drilling as described in any one of claims 1 to 9 is used and carried out according to the following steps: Step 1: Assemble the wireline coring drill with a dual power system for ultra-deep hole directional drilling. Select the coring tube (710) according to the drilling purpose required for the borehole and the characteristics of the borehole section. Use a flexible coring tube for directional drilling and a rigid coring tube for straight drilling. Step 2: Fix the straight drill pipe (100) to the drill rig. Place the coring mechanism (700) equipped with the rigid coring tube into the drill tool through a catcher and fix it. Apply a vertical force to the straight drill pipe (100) through the drill rig. Input drilling slurry at high pressure at the top of the drill tool. Drive the hollow motor (200) to rotate through the drilling slurry. At the same time, turn on the power supply of the hollow motor (400) to make the hollow motor (400) rotate synchronously with the hollow motor (200), and drive the drill tool to continuously drill straight into the rock formation. The core enters the rigid coring tube. When the core capacity in the rigid coring tube is about to reach the upper limit, stop the drilling work of the drill tool. Use the catcher to fish out the coring mechanism and take out the core in the rigid coring tube. Step 3: Repeat the straight drilling work and coring work in Step 2, and increase the number of assembled straight drill pipes (100) according to the change in the drilling depth until straight drilling reaches the starting position of directional drilling. Step 4: Disassemble the rigid coring tube from the coring mechanism (700) and replace it with a flexible coring tube. Step 5: Place the coring mechanism equipped with the flexible coring tube into the drill tool through a catcher and fix it. Apply an eccentric force opposite to the predetermined drilling direction to the straight drill pipe (100) through the drill rig, so that the flexible drill pipe and the flexible coring tube bend and deform synchronously in the direction of the designed trajectory curve. Input drilling slurry at high pressure at the top of the drill tool. Drive the hollow motor (200) to rotate through the drilling slurry. At the same time, turn on the power supply of the hollow motor (400) to make the hollow motor (400) rotate synchronously with the hollow motor (200), and drive the drill tool to continuously drill in a directional and curved manner into the rock formation. The core enters the flexible coring tube. When the core capacity in the flexible coring tube is about to reach the upper limit, stop the drilling work of the drill tool. Use the catcher to fish out the coring mechanism and take out the core in the flexible coring tube. Step 6: Repeat the directional drilling work and coring work in Step 5, and increase the number of assembled straight drill pipes (100) according to the change in drilling depth until the directional drilling reaches the predetermined directional bending target point; Step 7: Replace the flexible coring tube with a rigid coring tube, and repeat the straight drilling work and coring work in Step 2, and increase the number of assembled straight drill pipes (100) according to the change in drilling depth until the straight drilling reaches the predetermined depth; Step 8: Obtain the drilling trajectory of the drill string, analyze the actual drilling trajectory and determine the direction of directional drilling. Compare the actual drilling trajectory curve with the designed drilling trajectory curve to determine the deviation direction and offset of the actual drilling trajectory, and correct the drilling direction. Refer to the vertical section view of the actual drilling trajectory curve. If the drill bit in the actual drilling trajectory is above the drill bit in the designed drilling trajectory, reduce the eccentric force applied by the drill rig. If the drill bit in the actual drilling trajectory is below the drill bit in the designed drilling trajectory, increase the eccentric force applied by the drill rig. Refer to the horizontal section view of the actual drilling trajectory curve. If the drill bit in the actual drilling trajectory is on the left side of the drill bit in the designed drilling trajectory, adjust the direction of the eccentric force applied by the drill rig to the left. If the drill bit in the actual drilling trajectory is on the right side of the drill bit in the designed drilling trajectory, adjust the direction of the eccentric force applied by the drill rig to the right. Adjust the magnitude and direction of the eccentric force applied by the drill rig to make the actual drilling trajectory return to the designed drilling trajectory.

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