Wire line coring drilling tool and method for directional drilling

Abstract

The drilling tool comprises a straight drill rod, a hollow motor, a torque transmission mechanism, a flexible drill rod, a drill bit and a coring mechanism, and the straight drill rod, the hollow motor, the torque transmission mechanism, 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 driving fit with the torque transmission mechanism, and the torque transmission mechanism, the flexible drill rod and the drill bit are fixedly connected in sequence and can be driven by the hollow motor to synchronously rotate; 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 method has a wider range of deflecting amplitude, can be suitable for directional drilling construction with different deflecting amplitude requirements, and effectively improves the deflecting efficiency and the drilling efficiency of directional drilling.

Description

Technical Field

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

[0002] Engineering drilling is the most commonly used exploration technical means in engineering exploration and is widely used in industries such as transportation, municipal administration, 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, so there are certain limitations in the application fields; for example, in cross-riverbed exploration, when the borehole needs to cross the bottom of the river from one bank to the other, both vertical drilling and inclined drilling cannot 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 means 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, so as to obtain a certain directional drilling ability. However, current directional drilling has not been maturely applied in the engineering industry and mainly has the following disadvantages: 1. In an underground borehole, it is relatively difficult to control the direction of the eccentric mechanism in the circumferential direction of the drill pipe. Especially when the drill pipe rotates, the eccentric mechanism may also rotate synchronously, resulting in a large deviation of the borehole trajectory and even losing control of the drilling direction; 2. Using the eccentric mechanism to apply an eccentric force to the rigid drill pipe can only cause slight bending deformation of the rigid drill pipe, so the resulting deviation angle is also small. If a certain directional deviation angle is to be obtained, a sufficient drilling length must be extended to achieve it, and the deviation efficiency is extremely low; 3. It is necessary to frequently lift the drill to take cores, and both the core-taking efficiency and the drilling efficiency are relatively low; 4. A hole-opening power drill is used to provide power. When the drilling depth is relatively deep, the power transmission distance between the drill and the drill bit is relatively long. Especially under the action of the friction force between the drill pipe and the borehole, it will cause 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 for directional drilling that can effectively improve the deviation efficiency and core-taking efficiency of directional drilling.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows: A wireline coring drill for directional drilling, comprising a straight drill pipe, a hollow motor, a torque transmission mechanism, a flexible drill pipe, a drill bit and a coring mechanism. The straight drill pipe, the hollow motor, the torque transmission mechanism, the flexible drill pipe and the drill bit are all of 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 a connection end for the drilling rig. The hollow motor is drivingly matched with the torque transmission mechanism, and the torque transmission mechanism, the flexible drill pipe and the drill bit are sequentially fixedly connected 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 to the above solution: The hollow motor includes an outer stator, an inner rotor and an outer extension pipe. The outer stator is sleeved outside the inner rotor, and the outer stator is rotationally matched with the inner rotor relatively, and thread-like protrusion structures are provided on the mating surfaces of the outer stator and the inner rotor. The two ends of the outer stator are respectively threadedly connected to the straight drill pipe and the outer extension pipe. One end of the inner rotor close to the straight drill pipe is a free end, and the other end of the inner rotor is threadedly connected to the torque transmission mechanism. The outer extension pipe is sleeved outside the torque transmission mechanism and is in clearance fit with the torque transmission mechanism.

[0007] As an improvement to the above solution: The torque transmission mechanism includes a torque transmission spring, a filling layer, a first connection part and a second connection part. The torque transmission spring is a circular tube structure formed by winding steel bars in a spiral shape, and all parts of the steel bars are in contact with each other. The filling layer is formed by pouring flexible rubber to fill the inside and outside of the torque transmission spring. It also includes a connecting pipe, and the connecting pipe is a hollow cylindrical structure fixedly connected between the torque transmission mechanism and the flexible drill pipe. One end of the torque transmission spring is threadedly connected to the inner rotor through the first connection part, and the other end of the torque transmission spring is threadedly connected to the connecting pipe through the second connection part. The end of the outer extension pipe extends to the outside of the connecting pipe, and the connecting pipe forms a relative rotational fit with the outer extension pipe through a limiting bearing. Fixed grooves for snap-fit with the coring mechanism are provided on the inner wall of the outer extension pipe.

[0008] As an improvement to the above solution: The flexible drill pipe includes a spring rod, a protective sleeve, a first connection head and a second connection head. The spring rod is a circular tube structure formed by winding steel bars in a spiral shape, and the protective sleeve is sleeved outside the spring rod and is in contact with the spring rod. The protective sleeve is a flexible protective sleeve. One end of the flexible drill pipe is threadedly connected to the connecting pipe through the first connection head, and the other end of the flexible drill pipe is threadedly connected to the drill bit through the second connection head.

[0009] As an improvement to the above solution: It also includes a reaming ring, and the reaming ring is a hollow cylindrical structure coaxially arranged between the flexible drill pipe and the drill bit. The outer diameter of the reamer is larger than the outer diameter of the drill bit, and cutting teeth are radially protruded on the outer wall of the reamer.

[0010] 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 sealing ring that forms a sealing fit with the inner wall of the inner rotor is fixedly arranged at the connection part between the fishing head and the fixing part; two fixing lugs are arranged on the fixing part, one ends of the two fixing lugs are rotatably connected to the fixing part through a fixing shaft, the other ends of the two fixing lugs are respectively expanded to both sides and inserted into the fixing grooves to form a snap fit, and the two fixing lugs are connected by a compression spring; the single rotator is composed of two rotating monomers that are rotatably connected through a rotating shaft, one of the rotating monomers is threadedly connected to the fixing part, and the other rotating monomer is threadedly connected to the core barrel; one end of the guiding head is threadedly connected to the core barrel, the other end of the guiding head is a conical cutting end, and the guiding head is slidably matched with the axial movement channel of the coring mechanism through a guiding bearing; the core barrel is slidably matched with the axial movement channel of the coring mechanism through a sliding bearing.

[0011] As an improvement to the above solution: It further includes an equipment installation mechanism arranged between the single rotator and the core barrel; both ends of the equipment installation mechanism are respectively threadedly connected to the single rotator and the core barrel; an attitude detector is arranged inside the equipment installation mechanism, and the attitude detector is electrically connected and composed of a three-dimensional positioning system, a data acquisition system, a battery, a storage medium, and a wireless receiving and transmitting device.

[0012] As an improvement to the above solution: The core barrel is a flexible core barrel, and the flexible core barrel is a flexible circular tube structure formed by winding steel bars in a spiral shape. Flexible wear-resistant layers are fixedly arranged on both the inner and outer sides of the flexible core barrel; the flexible core barrel bends 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, and the rigid core barrel is a rigid circular tube structure; the rigid core barrel restricts the flexible drill pipe from bending when the flexible drill pipe is subjected to axial pressure.

[0014] The present invention also discloses a wireline coring method for directional drilling. Using the wireline coring drill for directional drilling as described above, it is carried out according to the following steps: Step 1: Assemble the wireline coring drill for directional drilling. Select the core barrel according to the drilling purpose required for the borehole and the characteristics of the borehole section. Use a flexible core barrel when carrying out directional drilling, and use a rigid core barrel when carrying out straight drilling; Step 2: Fix the straight drill pipe to the drill rig. Place the coring mechanism with the rigid coring tube into the drill string through the catcher and fix it. Apply a vertical force to the straight drill pipe through the drill rig. Input drilling slurry under high pressure at the top of the drill string. Drive the hollow motor to rotate through the drilling slurry and drive 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, salvage the coring mechanism through the catcher and take out the core. Step 3: Repeat the straight drilling work and coring work in Step 2 until drilling straight to the predetermined depth. 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 with the flexible coring tube into the drill string through the catcher 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. Input drilling slurry under high pressure at the top of the drill string. Drive the hollow motor to rotate through the drilling slurry and drive the drill string 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, salvage the coring mechanism through the catcher and take out the core. Step 6: Repeat the directional drilling work and coring work in Step 5 until drilling in a directional manner to the predetermined depth. Step 7: Obtain the spatial trajectory during the directional drilling process, and compare the actual drilling trajectory curve with the designed drilling trajectory curve. 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. Make the actual drilling trajectory return to the designed drilling trajectory by adjusting the magnitude and direction of the eccentric force applied by the drill rig. Step 8: Obtain the three-dimensional spatial coordinates of each depth position in the borehole and import them into the three-dimensional geological model. Import the geological information carried by the core into the three-dimensional geological model, obtain the geological information of each drilling part, and realize the advanced prediction of underground chambers and the classification of surrounding rocks relying on directional drilling.

[0015] The beneficial effects of the present invention are: 1. The present invention effectively improves the core sampling efficiency by arranging a core sampling mechanism inside the drill string and successively connecting a straight drill pipe, a hollow motor, a torque transmission mechanism, a flexible drill pipe, and a drill bit to form a channel for the axial movement of the core sampling mechanism, without affecting the core sampling by the core sampling mechanism during the drilling process. The core sampling mechanism of the present invention can be selectively configured with a flexible core tube or a rigid core tube, and can select the corresponding core tube according to the characteristics of the borehole section during the drilling process, enabling the core sampling work to be adapted to the drilling work. The flexible core tube can automatically adjust its bending posture along with the drilling posture of the drill string during directional drilling, while the rigid core tube can limit the bending deformation of the flexible drill pipe during straight drilling, thereby effectively improving the applicability of directional drilling work. 2. The present invention effectively improves the inclination forming efficiency and drilling efficiency of directional drilling by arranging a flexible drill pipe between the straight drill pipe and the drill bit. The flexible drill pipe has the characteristic of complete deformability. When the pressure applied by the hole-opening drilling rig is transmitted from the straight drill pipe to the flexible drill pipe, the flexible drill pipe will produce corresponding bending deformation, and the degree of bending deformation of the flexible drill pipe is different under the action of different pressures of the hole-opening drilling rig, enabling the present invention to have a wider range of inclination forming amplitudes and being applicable to directional drilling construction with different inclination forming amplitude requirements. 3. The present invention arranges the hollow motor, which is a drilling power component, close to the drill bit. The hollow motor directly drives the flexible drill pipe and the drill bit to rotate, thereby improving the existing hole-opening drilling power to hole-bottom drilling power. As the drilling depth increases, since the distance between the hollow motor and the drill bit remains unchanged, there will be no obvious power attenuation, and it will not affect the core sampling work by the core sampling mechanism. 4. The present invention can obtain the spatial trajectory of the drill string in real time during the entire drilling process, thereby guiding the direction of the drill string during directional bending drilling in real time and correcting the drilling direction based on the obtained spatial trajectory. It has the function of measuring the trajectory while drilling, is more convenient for controlling the drilling trajectory, and improves the drilling efficiency by ensuring the accuracy of the drilling trajectory. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a sectional view of the present invention in the natural state; Figure 2 is a sectional view of the present invention in the directional drilling state; Figure 3 is a sectional view of the present invention in the straight drilling state; Figure 4 is a schematic structural view of the core sampling mechanism of the present invention; Figure 5 is a schematic structural view of the flexible drill pipe of 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] In the figure, the markings are: 100 - straight drill pipe, 200 - hollow motor, 210 - outer stator, 220 - inner rotor, 230 - extension pipe, 300 - torque transmission mechanism, 310 - torque transmission spring, 320 - filling layer, 330 - first connection part, 340 - second connection part, 350 - connecting pipe, 360 - limit bearing, 400 - flexible drill pipe, 410 - spring rod, 420 - protective sleeve, 430 - first connection head, 440 - second connection head, 500 - drill bit, 600 - core sampling mechanism, 610 - core sampling pipe, 620 - fishing head, 630 - guiding head, 640 - fixing part, 650 - single rotator, 660 - sealing ring, 670 - fixing clamp ear, 680 - guiding bearing, 690 - sliding bearing, 700 - reaming ring, 800 - equipment installation mechanism, 810 - attitude detector. Specific embodiments

[0018] For the convenience of understanding the present invention, the present invention will be further described below with reference to 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 tool for directional drilling disclosed by the present invention includes a straight drill pipe 100, a hollow motor 200, a torque transmission mechanism 300, a flexible drill pipe 400, a drill bit 500 and a coring mechanism 600. 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 tool can also be extended by increasing the number of straight drill pipes 100 and connecting them. The hollow motor 200 serves as a power component for the drilling operation, provides power for the drilling of the drill tool, and improves the prior art solution where the power component is located at the borehole orifice by arranging the hollow motor 200 near the bottom end of the drill bit 500 of the drill tool. The distance between the hollow motor 200 as the power component and the drill bit 500 remains unchanged. The torque transmission mechanism 300 is used to transmit the upward acting force. The torque transmission mechanism 300 can convert the upward eccentric acting force into an axial acting force and transmit it downward. The flexible drill pipe 400 can be bent and deformed when subjected to an upward acting force, and the flexible drill pipe 400 bends correspondingly according to the magnitude of the acting force received, so as to obtain an appropriate deviation angle. The drill bit 500 cuts the rock of the borehole through its own rotation, enabling the drill tool to continuously drill deeper. In the present invention, the straight drill pipe 100, the hollow motor 200, the torque transmission mechanism 300, the flexible drill pipe 400 and the drill bit 500 are all arranged in a hollow cylindrical structure, and the hollow parts of the above components are connected axially to form a channel for the coring mechanism 600 to move. The coring mechanism 600 realizes the taking of the core by axially moving in this channel; the coring mechanism 600 is equipped with a detachable coring tube 610, and the coring tube 610 takes and stores the core during the drilling process of the drill tool.

[0021] Specifically, as Figures 1 to 3 shown in the figure, the straight drill pipe 100 in the present invention is in a hollow cylindrical structure. The hollow part of the straight drill pipe 100 is a part of the moving channel of the coring mechanism 600. In addition, the hollow part of the straight drill pipe 100 can also provide a flow channel for the drilling slurry. 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 a drill rig connection end. The straight drill pipe 100 can be threadedly connected to the drill rig at the orifice 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 connection number of the 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 drill rig at the surface drill opening, and the length of the entire drill tool is extended to adapt to the drilling depth. The straight drill pipe 100 is a rigid structure, and the straight drill pipe 100 can directly bear the drilling pressure and eccentric force applied by the drill rig at the orifice. The straight drill pipe 100 serves as a force transmission component to transmit the acting force applied by the drill rig at the orifice downward.

[0022] Specifically, asFigures 1 to 3 As shown, the hollow motor 200 in the present invention is composed of an outer stator 210, an inner rotor 220 and an extension tube 230. The hollow motor 200 is arranged between the straight drill pipe 100 and the torque transmission mechanism 300. The outer stator 210, the inner rotor 220 and the extension tube 230 that make up the hollow motor 200 are hollow cylindrical structures with different size specifications and coaxial settings. The hollow motor 200 is used to drive the components connected below, including the torque transmission mechanism 300, the flexible drill pipe 400 and the drill bit 500, to rotate synchronously. The outer stator 210 is sleeved outside the inner rotor 200. The upper end of the outer stator 210 is threadedly connected to the straight drill pipe 100 above, and the lower end of the outer stator 210 is threadedly connected to the extension tube 230 below. The inner rotor 220 is located inside the outer stator 210. The lower end of the inner rotor 220 is threadedly connected to the torque transmission mechanism 300, and the upper end of the inner rotor 220 is a free end that is not fixed. There is a clearance fit between the outer stator 210 and the inner rotor 220 and they can rotate relative to each other. The outer side surface of the outer stator 210 is a smooth surface, and the inner side surface of the inner rotor 220 is a smooth surface. On the opposite surfaces of the outer stator 210 and the inner rotor 220, that is, on the inner side surface of the outer stator 210 and the outer side surface of the inner rotor 220, there are thread-like raised structures, and the thread-like raised structures of the outer stator 210 and the inner rotor 220 cooperate with each other. The free end of the inner rotor 220 is located in the through hole of the straight drill pipe 100, so that the through hole of the straight drill pipe 100 can communicate with the fit clearance between the outer stator 210 and the inner rotor 220. Then, the drilling slurry can be conveyed to the fit clearance between the outer stator 210 and the inner rotor 220 through the channel of the straight drill pipe 100. When the drilling slurry passes through the mating surface where the outer stator 210 and the inner rotor 220 are provided with thread-like protrusions, it can drive the inner rotor 220 to rotate, so that the hollow motor 200 generates a rotational force and drives the torque transmission mechanism 300 connected to the lower part of the inner rotor 220 to rotate synchronously.

[0023] Furthermore, in order to reduce the wear of the thread-like raised structures of the outer stator 210 and the inner rotor 220, the present invention also fixes a layer of wear-resistant rubber layer on the surfaces of the thread-like raised structures of the outer stator 210 and the inner rotor 220, so as to reduce the mechanical wear caused by the mutual friction of the thread-like raised structures and improve the service life of the hollow motor 200.

[0024] Since the rotation of the inner rotor 220 is achieved by the flow of the drilling slurry in cooperation with the threaded convex structure, the rotation of the inner rotor 220 is an eccentric rotation, which will drive the lower mechanism connected to the inner rotor 220 to generate an eccentric rotation, thus being unfavorable for controlling the drilling direction. The present invention limits the rotation of the lower mechanism by providing an extension pipe 230. The extension pipe 230 is sleeved outside the torque transmission mechanism 300 and is in clearance fit with the torque transmission mechanism 300. The upper end of the extension pipe 230 is fixedly connected to the outer stator 210 by threads, and the lower end of the extension pipe 230 is a free end. By providing the extension pipe 230, the mechanism located inside the extension pipe 230 is limited to only generate an axial rotation under the drive of the eccentric rotation of the inner rotor 220; at the same time, the extension pipe 230 can also protect the mechanism inside, avoiding damage to the mechanism located inside the extension pipe 230 caused by impurities such as rock blocks and rock cuttings.

[0025] Specifically, as Figures 1 to 3 shown, the torque transmission mechanism 300 in the present invention is composed of a torque transmission spring 310, a filling layer 320, a first connecting portion 330, a second connecting portion 340, and a connecting pipe 350. The torque transmission spring 310 is a circular tube structure formed by winding steel bars in a spiral shape. The steel bars for preparing the torque transmission spring 310 can be circular steel bars or square steel bars; in the present invention, it is preferred to use circular steel bars because using circular steel bars can reduce the contact area of each part of the torque transmission spring 310. Since the torque transmission spring 310 is driven by the high-speed eccentric motion of the inner rotor 220, reducing the contact area between each part of the torque transmission spring 310 can effectively reduce the mutual friction inside the torque transmission spring 310. The filling layer 320 is a flexible rubber casting layer. The gaps inside and outside the torque transmission spring 310 are cast by the flexible rubber, so that the torque transmission mechanism 300 as a whole forms a hollow cylindrical structure. By providing the filling layer 320, the inner and outer walls of the torque transmission mechanism 300 can be smooth surfaces, facilitating the movement of the core-taking mechanism 600; by providing the torque transmission spring 310 and the filling layer 320, the torque transmission mechanism 300 as a whole can be flexible. The eccentric rotation force of the inner rotor 220 in the hollow motor 200 is transmitted to the torque transmission mechanism 300. The torque transmission mechanism 300 deforms in any direction through the torque transmission spring 310 and the filling layer 320, and through the stretchable and compressible characteristics of the torque transmission spring 310, the eccentric rotation force transmitted by the inner rotor 220 is converted into the axial rotation force of the lower connecting pipe 350, changing the direction of the rotation force while realizing the transmission of the rotation force.

[0026] The connecting pipe 350 of the torque transmission mechanism 300 is a hollow cylindrical structure fixedly connected between the torque transmission mechanism 300 and the flexible drill pipe 400; one end of the torque transmission spring 310 is threadedly connected to the inner rotor 220 through the first connecting portion 330, and the other end of the torque transmission spring 310 is threadedly connected to the connecting pipe 350 through the second connecting portion 340. The other end of the connecting pipe 350 is threadedly connected to the flexible drill pipe 400 below; the end of the extension pipe 230 extends to the outside of the connecting pipe 350. A limiting bearing 360 is sleeved outside the connecting pipe 350. The outer ring of the limiting bearing 360 forms an axial limiting fit with the extension pipe 230 to limit the upward axial movement of the connecting pipe 350. The inner ring of the limiting bearing 360 is fixedly connected to the connecting pipe 350. The connecting pipe 350 forms a relative rotational fit with the extension pipe 230 through the limiting bearing 360; by providing the limiting bearing 360, the connecting pipe 350 can only perform axial rotation.

[0027] Specifically, such as Figures 1 to 3 and Figure 5 、 Figure 7As shown in the figure, the flexible drill pipe 400 in the present invention is composed of a spring rod 410, a protective sleeve 420, a first connector 430 and a second connector 440. The spring rod 410 is a circular tube structure formed by winding a steel bar in a spiral shape; the steel bar for preparing the spring rod 410 can be a round steel bar or a square steel bar. In the present invention, it is preferred to use a square steel bar as the steel bar for preparing the spring rod 410 because the square steel bar can increase the contact area of each part of the spring rod 410. When the spring rod 410 is not bent, it ensures that each part of the spring rod 410 is closely attached, and using a square steel bar can also increase the stiffness of the spring rod 410 when it is bent. The flexible drill pipe 400 can be flexible through the spring rod 410. After receiving the axial force transmitted by the upper torque transmission mechanism 300, the spring rod 410 in the flexible drill pipe 400 will bend and deform, driving the overall bending of the flexible drill pipe 400, so as to provide sufficient hole deviation amplitude for the drill tool and realize the directional bending drilling of the drill tool. Both the first connector 430 and the second connector 440 are hollow cylindrical structures with conical surfaces. A conical threaded interface is provided on the inner side of the upper end of the first connector 430, and a conical threaded interface is provided on the outer side of the lower end of the second connector 440; both ends of the spring rod 410 are welded to the first connector 430 and the second connector 440 respectively. One end of the flexible drill pipe 400 is threadedly connected to the connecting pipe 350 through the first connector 430, and the other end of the flexible drill pipe 400 is threadedly connected to the drill bit 500 through the second connector 440. Considering that during the directional bending drilling of the drill tool, when the spring rod 410 of the flexible drill pipe 400 bends and deforms, the side where the spring rod 410 bends and expands will continuously rub against the borehole wall. In order to reduce the wear of the spring rod 410, the present invention protects the spring rod 410 by sleeving a protective sleeve 420 on the outer side of the spring rod 410; during the rotation of the flexible drill pipe 400, the protective sleeve 420 is in direct contact with the borehole wall, and the protective sleeve 420 bears the friction of the borehole wall, avoiding direct contact between the borehole wall and the spring rod 410 and causing wear; in addition, the protective sleeve 420 can also isolate the spring rod 410 from the borehole wall, and can prevent rock debris in the borehole from entering the flexible drill pipe 400. The protective sleeve 420 can be made of a rubber sleeve or a stainless steel braided sleeve with good wear resistance, and also has flexible characteristics and can bend together with the spring rod 410.

[0028] Specifically, as Figures 1 to 3As shown, the present invention sets a reaming ring 700 between the flexible drill rod 400 and the drill bit 500. The drill bit 500 adopts a hollow circular tube structure, and the drill bit 500 is fixedly connected to the flexible drill rod 400 through the reamer 700. A plurality of cutting teeth are fixedly arranged at one end of the drill bit 500 away from the flexible drill rod 400. The drill bit 500 rotates under the drive of the flexible drill rod 400 to cooperate with the cutting teeth to cut the rock in the borehole, so that the drilling tool can drill continuously. The reaming ring 700 is also a hollow circular tube structure, and cutting teeth are radially protruding on the outer wall of the reaming ring 700. The two ends of the reaming ring 700 are respectively threadedly connected to the flexible drill rod 400 and the drill bit 500. The reaming ring 700 rotates under the drive of the flexible drill rod 400 and uses the cutting teeth on the outer wall to cut the wall of the borehole, so as to further expand the diameter of the borehole, leaving enough space for the complete deformation of the flexible drill rod 400. The outer diameter of the expansion ring 700 is preferably set to be larger than the outer diameter of the drill bit 500 so that the expansion hole diameter of the expansion ring 700 is larger than the drilling hole diameter of the drill bit 500.

[0029] Specifically, Figures 1 to 4 As shown, the coring mechanism 600 of the present invention includes, in addition to the coring tube 610 , a fishing head 620 , a guide head 630 , a fixing portion 640 and a single rotator 650 .

[0030] The fishing head 620 of the coring mechanism 600 is used to connect with the fishing device. The fishing device can connect the coring mechanism 600 by fixing and releasing the fishing head 620. After the fishing device is connected with the fishing head 620, the coring mechanism 600 can be fished to extract the core, and the coring mechanism 600 can also be lowered into the drilling tool through the fishing device; one end of the fishing head 620 is provided with a conical cap, and the other end of the fishing head 620 is welded and fixed to the fixing part 640 through a round tube or other connecting parts; the space between the fishing head 620 and the fixing part 640 is A sealing ring 660 is also fixedly provided on the connecting component. The sealing ring 660 is a flexible rubber sealing ring. The sealing ring 660 is in contact with the inner wall of the inner rotor 220 to form a sealing fit. The sealing ring 660 can seal and waterproof the inner wall of the inner rotor 220, so that the drilling slurry retained in the channel of the straight drill rod 100 cannot enter under the sealing ring 660, but can only flow into the channel between the inner rotor 220 and the outer stator 210, so as to ensure the driving of the inner rotor 220 by the conveying of the drilling slurry and ensure the operation of the hollow motor 200.

[0031] The guide head 630 of the coring mechanism 600 is used to guide the movement of the coring mechanism 600 in the channel. One end of the guide head 630 is threadedly connected to the bottom end of the core barrel 610 through a tubular guide pipe provided with a tapered thread interface. The other end of the guide head 630 is a tapered cut end with a tapered cut. Through the tapered cut end of the guide head 630, the contact between the guide head 630 and the drill tool can be reduced, making it easier for the guide head 630 to drive the entire coring mechanism 600 to move inside the drill tool. In addition, a guide bearing 680 is fixed outside the guide head 630. There are balls outside the guide bearing 680. The balls of the guide bearing 680 are in sliding fit with the channel for the axial movement of the coring mechanism 600. Through the guide bearing 680, the movement of the guide head 630 in the channel can be limited to ensure the smooth movement of the guide head 630. And by setting the guide bearing 680, the guide head 630 can form a relative rotational fit with the external mechanism to avoid synchronous rotation between the guide head 630 and the external mechanism. At the same time, a sliding bearing 690 is fixedly installed at the upper end of the core barrel 610. There are balls outside the sliding bearing 690. The sliding bearing 690 and the guide bearing 680 installed on the guide head 630 play the same role. The sliding bearing 690 limits the movement of the core barrel 610 inside the drill tool and ensures the smooth movement of the core barrel 610. By setting the sliding bearing 690, the core barrel 610 can form a relative rotational fit with the external mechanism to avoid synchronous rotation of the core barrel 610.

[0032] The fixing part 640 of the coring mechanism 600 is used to fix the coring mechanism 600 inside the drill tool. One end of the fixing part 640 is fixedly welded to the fishing head 620 through a connecting component. The other end of the fixing part 640 is threadedly connected to the single swivel 650. Two fixing lugs 670 are provided on the fixing part 640. One end of the two fixing lugs 670 is rotatably connected to the fixing part 640 through a fixing shaft. The other ends of the two fixing lugs 670 extend to both sides of the fixing part 640. There is a fixing groove on the inner wall of the extension pipe 230. The extended ends of the two fixing lugs 670 can be inserted into the fixing groove and snap-fitted with the fixing groove, thus realizing the fixing of the fixing part 640 and the entire coring mechanism 600 inside the drill tool. A compression spring is also connected between the two fixing lugs 670. Through the elasticity of the compression spring 670, a pressing force is applied to the two fixing lugs 670 to press the two fixing lugs 670 in the fixing groove. When it is necessary to fish the coring mechanism 600, the fishing device lifts the entire coring mechanism 600 through the fishing head 620. The fixing lugs 670 are pulled upward and contract inward to compress the compression spring. The compression spring is compressed, and the fixing lugs 670 disengage from the fixing groove.

[0033] The single rotator 650 of the coring mechanism 600 is composed of two rotating monomers. The two rotating monomers are connected by a rotating shaft to form a relative rotating 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 640 and the coring tube 610. Since the two rotating monomers of the single rotator 650 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 640 rotates, the lower rotating monomer connected to the coring tube 610 does not rotate. This avoids the wear of the core in the coring tube caused by rotation, especially the wear of the core structural plane.

[0034] Further, as Figures 1 to 4 and Figure 6 shown, an equipment installation mechanism 800 is also provided in the coring mechanism 600 of the present invention. The equipment installation mechanism 800 is arranged between the single rotator 650 and the coring tube 610. An attitude detector 810 is installed in the equipment installation mechanism 800 through an equipment bin. The equipment installation mechanism 800 is of a cylindrical structure, and the equipment bin is located in the middle of the equipment installation mechanism 800. A conical thread interface is provided on the inner side of the upper end of the equipment installation mechanism 800 and is threadedly connected to the lower rotating monomer of the single rotator 650. A conical thread interface is provided on the outer side of the lower end of the equipment installation mechanism 800 and is threadedly connected to the coring tube 610. The attitude detector 810 is electrically connected by a three-dimensional positioning system, a data acquisition system, a battery, a storage medium, and a wireless receiving transmitter. The three-dimensional positioning system is used for three-dimensional space positioning. The three-dimensional positioning system is composed of a gyroscope, a three-axis magnetoresistive sensor, and a three-axis acceleration sensor. The data acquisition system is used for collecting and processing data. The storage battery provides electrical energy for the entire attitude detector 810. The storage medium is used for storing data. The radio receiving transmitter is used for receiving the instructions of the drilling hole mouth instrument and sending the acquired data to the drilling hole mouth instrument. The attitude detector 810 can collect the three-dimensional space coordinates at each drilling depth and each time point during the drilling process of the drill tool, and sequentially obtain the space trajectory of the drill tool during the entire drilling process, so as to be able to be used to guide the direction of the drill tool during directional bending drilling in real time, and can correct the drilling direction, with the function of measuring the trajectory while drilling, and can strengthen the production of subsequent geological section diagrams through the drilling space trajectory.

[0035] The coring tube 610 configured in the coring mechanism 600 of the present invention can be disassembled and replaced. The coring tube 610 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. A flexible coring tube is used for directional drilling, and a rigid coring tube is used for straight drilling.

[0036] As Figure 1 and Figure 2As shown, the core barrel 610 uses a flexible core barrel. The framework structure of the flexible core barrel is a spring tube formed by winding steel bars in a spiral shape. The steel bars used to prepare the spring tube can be square steel bars or round steel bars. Since the framework structure of the flexible core barrel will not rotate synchronously when the drilling tool rotates, as long as it can produce a certain amount of bending deformation, the framework structure of the flexible core barrel can also use other tubular structures that can produce a certain amount of bending deformation. Flexible wear-resistant layers are also provided on the inner and outer sides of the spring tube, and the flexible wear-resistant layers are made of flexible rubber. By setting the flexible wear-resistant layers, the inner and outer walls of the flexible core barrel are straight and smooth, which is convenient for the core inside the core barrel 610 to slide in and out, and at the same time, it can reduce the wear of the core on the contacting parts. The top of the flexible core barrel is provided with a top connection port. The top connection port uses a hollow cylinder. The inner wall of the upper end of the top connection port is provided with a tapered thread connection port and is threadedly connected to the upper equipment installation mechanism 800. The lower end of the top connection port is welded to the spring tube. The bottom of the flexible core barrel is provided with a bottom connection port. The bottom connection port uses a hollow cylinder. The outer wall of the lower end of the bottom connection port is provided with a tapered thread connection port and is threadedly connected to the lower guide head 630. The upper end of the bottom connection port is welded to the spring tube. When the flexible core barrel is under axial pressure from the flexible drill pipe 400, it can bend and deform synchronously with the flexible drill pipe 400, so that when the drilling tool performs directional bending drilling, it can bend and deform in the same trend as the flexible drill pipe 400 and make corresponding bending adjustments according to the drilling attitude of the drilling tool.

[0037] As Figure 3 shown, the core barrel 610 uses a rigid core barrel. The rigid core barrel is a rigid circular tube structure that cannot produce bending deformation. The top of the rigid core barrel is provided with a top connection port. The top connection port uses a hollow cylinder. The inner wall of the upper end of the top connection port is provided with a tapered thread connection port and is threadedly connected to the upper equipment installation mechanism 800. The lower end of the top connection port is welded to the spring tube. The bottom of the rigid core barrel is provided with a bottom connection port. The bottom connection port uses a hollow cylinder. The outer wall of the lower end of the bottom connection port is provided with a tapered thread connection port and is threadedly connected to the lower guide head 630. The upper end of the bottom connection port is welded to the spring tube. Since the rigid core barrel cannot produce bending deformation, when performing straight drilling, the rigid core barrel can limit the bending deformation of the flexible drill pipe 400 when the flexible drill pipe 400 is under axial pressure through its own rigidity, ensuring that the flexible drill pipe 400 remains in a straight state.

[0038] The present invention also discloses a wireline coring method for directional drilling, which uses the wireline coring drill for directional drilling as described above and is carried out according to the following steps: Step 1: Assemble the wireline coring drill for directional drilling. Select the core barrel according to the drilling purpose required for the borehole and the characteristics of the borehole section. Use the flexible core barrel when carrying out directional drilling, and use the rigid core barrel when carrying out 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 the 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 string. Drive the hollow motor 200 to rotate through the drilling slurry and drive 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, fish out the coring mechanism 600 through the catcher and take out the core. Step 3: Repeat the straight drilling work and coring work in Step 2 until drilling straight to the predetermined depth. Step 4: Disassemble the rigid coring tube from the coring mechanism 600 and replace it with a flexible coring tube. Step 5: Place the coring mechanism 600 equipped with the flexible coring tube into the drill string through the 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 400 and the flexible coring tube are synchronously bent and deformed. Input drilling slurry at high pressure at the top of the drill string. Drive the hollow motor 200 to rotate through the drilling slurry and drive the drill string 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, fish out the coring mechanism 600 through the catcher and take out the core. Step 6: Repeat the directional drilling work and coring work in Step 5 until drilling in a directional manner to the predetermined depth. Step 7: Obtain the spatial trajectory during the directional drilling process, and compare the actual drilling trajectory curve with the designed drilling trajectory curve. 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. Control the space of the drilling trajectory and correct the deviation of the drilling trajectory by adjusting 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. Step 8: Obtain the three-dimensional space coordinates of each depth position in the borehole and import them into the three-dimensional geological model. Import the geological information carried by the core into the three-dimensional geological model to obtain the geological information of each drilling part, and realize the underground chamber advanced prediction and surrounding rock classification relying on directional drilling.

Claims

1. Wireline coring drill for directional drilling, characterized in that: It includes a straight drill pipe (100), a hollow motor (200), a torque transmission mechanism (300), a flexible drill pipe (400), a drill bit (500) and a coring mechanism (600). The straight drill pipe (100), the hollow motor (200), the torque transmission mechanism (300), the flexible drill pipe (400) and the drill bit (500) are all hollow cylindrical structures and are sequentially connected to form a channel for the axial movement of the coring mechanism (600). 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 matched with the torque transmission mechanism (300), and the torque transmission mechanism (300), the flexible drill pipe (400) and the drill bit (500) are sequentially fixedly connected and can rotate synchronously under the drive of the hollow motor (200). The coring mechanism (600) includes a detachable coring pipe (610), and the coring pipe (610) is located inside the flexible drill pipe (400). The coring pipe (610) is a flexible coring pipe or a rigid coring pipe.

2. The wireline coring drill for directional drilling according to claim 1, characterized in that: The hollow motor (200) includes an outer stator (210), an inner rotor (220) and an outer extension pipe (230). The outer stator (210) is sleeved outside the inner rotor (220), and the outer stator (210) is rotationally matched with the inner rotor (220), and threaded convex structures are provided on the mating surfaces of the outer stator (210) and the inner rotor (220). The two ends of the outer stator (210) are respectively threadedly connected to the straight drill pipe (100) and the outer extension pipe (230). One end of the inner rotor (220) close to the straight drill pipe (100) is a free end, and the other end of the inner rotor (220) is threadedly connected to the torque transmission mechanism (300). The outer extension pipe (230) is sleeved outside the torque transmission mechanism (300) and is in clearance fit with the torque transmission mechanism (300).

3. The wireline coring drill for directional drilling according to claim 2, wherein: The torque transmission mechanism (300) includes a torque transmission spring (310), a filling layer (320), a first connection part (330) and a second connection part (340). The torque transmission spring (310) is a circular tube structure formed by winding steel bars in a spiral shape, and all parts of the steel bars are in contact with each other. The filling layer (320) is formed by pouring flexible rubber to fill the inside and outside of the torque transmission spring (310). It also includes a connecting pipe (350), and the connecting pipe (350) is a hollow cylindrical structure fixedly connected between the torque transmission mechanism (300) and the flexible drill pipe (400). One end of the torque transmission spring (310) is threadedly connected to the inner rotor (220) through the first connection part (330), and the other end of the torque transmission spring (310) is threadedly connected to the connecting pipe (350) through the second connection part (340). The end of the outer extension pipe (230) extends to the outside of the connecting pipe (350), and the connecting pipe (350) forms a relative rotational fit with the outer extension pipe (230) through a limit bearing (360). Fixed grooves for snap-fit with the coring mechanism (600) are provided on the inner wall of the outer extension pipe (230).

4. The wireline coring drill for directional drilling according to claim 3, wherein: The flexible drill pipe (400) includes a spring rod (410), a protective sleeve (420), a first connector (430) and a second connector (440); the spring rod (410) is a circular tube structure formed by winding steel bars in a spiral shape, the protective sleeve (420) is sleeved outside the spring rod (410) and abuts against the spring rod (410), and the protective sleeve (420) is a flexible protective sleeve; one end of the flexible drill pipe (400) is threadedly connected to the connecting pipe (350) through the first connector (430), and the other end of the flexible drill pipe (400) is threadedly connected to the drill bit (500) through the second connector (440).

5. The wireline coring drill for directional drilling according to claim 4, characterized in that: It further includes a reaming ring (700), and the reaming ring (700) is a hollow cylindrical structure coaxially arranged between the flexible drill pipe (400) and the drill bit (500); the outer diameter of the reaming ring (700) is larger than the outer diameter of the drill bit (500), and cutting teeth are radially protruded on the outer wall of the reaming ring (700).

6. The wireline coring drill for directional drilling according to claim 3, characterized in that: The coring mechanism (600) further includes a fishing head (620), a guide head (630), a fixing part (640) and a single rotator (650); one end of the fishing head (620) is provided with a conical cap, the other end of the fishing head (620) is fixedly connected to the fixing part (640), and a sealing ring (660) that forms a sealing fit with the inner wall of the inner rotor (220) is fixedly arranged at the connecting part between the fishing head (620) and the fixing part (640); two fixing lugs (670) are arranged on the fixing part (640), one ends of the two fixing lugs (670) are rotatably connected to the fixing part (640) through a fixing shaft, the other ends of the two fixing lugs (670) are respectively unfolded to both sides and inserted into the fixing slots to form a snap fit, and the two fixing lugs (670) are connected by a compression spring; the single rotator (650) is composed of two rotating monomers rotatably connected through a rotating shaft, one of the rotating monomers is threadedly connected to the fixing part (640), and the other rotating monomer is threadedly connected to the coring tube (610); one end of the guide head (630) is threadedly connected to the coring tube (610), the other end of the guide head (630) is a conical cut end, and the guide head (630) is slidably fitted with the axial movement channel of the coring mechanism (600) through a guide bearing (680); the coring tube (610) is slidably fitted with the axial movement channel of the coring mechanism (600) through a sliding bearing (690).

7. The wireline coring drill for directional drilling according to claim 6, characterized in that: It further includes an equipment installation mechanism (800) arranged between the single rotator (650) and the coring tube (610); both ends of the equipment installation mechanism (800) are threadedly connected to the single rotator (650) and the coring tube (610) respectively; an attitude detector (810) is arranged inside the equipment installation mechanism (800), and the attitude detector (810) is electrically connected by a three-dimensional positioning system, a data acquisition system, a battery, a storage medium and a wireless receiving and transmitting device.

8. The wireline coring drill for directional drilling according to claim 1, characterized in that: The coring tube (610) is a flexible coring tube. The flexible coring tube is a flexible circular tube structure formed by helically winding steel bars. Flexible wear-resistant layers are fixedly arranged on both the inner and outer sides of the flexible coring tube; when the flexible drill pipe (400) is subjected to axial pressure, the flexible coring tube bends and deforms synchronously with the flexible drill pipe (400).

9. The wireline coring drill tool for directional drilling according to claim 1, wherein: The coring tube (610) is a rigid coring tube. The rigid coring tube is a rigid circular tube structure; when the flexible drill pipe (400) is subjected to axial pressure, the rigid coring tube restricts the flexible drill pipe (400) from bending and deforming.

10. Wireline coring method for directional drilling, characterized in that: The wireline coring drill for directional drilling 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 for directional drilling. Select the coring tube 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 to the drilling rig. Place the coring mechanism equipped with the rigid coring tube into the drill tool through the catcher and fix it. Apply a vertical force to the straight drill pipe (100) through the drilling 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 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, fish out the coring mechanism (600) through the catcher and take out the core. Step 3: Repeat the straight drilling work and coring work in Step 2 until the straight drilling reaches the predetermined depth. Step 4: Disassemble the rigid coring tube from the coring mechanism (600) and replace it with a flexible coring tube. Step 5: Place the coring mechanism (600) equipped with the flexible coring tube into the drill tool through the catcher and fix it. Apply an eccentric force opposite to the predetermined drilling direction to the straight drill pipe (100) through the drilling rig, so that the flexible drill pipe (400) and the flexible coring tube bend and deform synchronously. Input drilling slurry at high pressure at the top of the drill tool. Drive the hollow motor (200) to rotate through the drilling slurry and drive the drill tool 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, fish out the coring mechanism (600) through the catcher and take out the core. Step 6: Repeat the directional drilling work and coring work in Step 5 until the directional drilling reaches the predetermined depth. Step 7: Obtain the spatial trajectory during directional drilling, and compare the actual drilling trajectory curve with the designed drilling trajectory curve; referring 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, then reduce the eccentric force applied by the drill rig, and if the drill bit in the actual drilling trajectory is below the drill bit in the designed drilling trajectory, then increase the eccentric force applied by the drill rig; referring 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, then adjust the direction of the eccentric force applied by the drill rig to the left, and if the drill bit in the actual drilling trajectory is on the right side of the drill bit in the designed drilling trajectory, then 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. Step 8: Obtain the three-dimensional spatial coordinates of each depth position in the borehole and import them into the three-dimensional geological model, import the geological information carried by the core into the three-dimensional geological model, obtain the geological information of each drilling part, and realize the underground cavern advance prediction and surrounding rock classification relying on directional drilling.

Images