Flush fluid dynamic pushback rotary steerable directional continuous wireline coring drill and method

Abstract

The application discloses a kind of flushing liquid dynamic push back rotary directional build angle continuous rope coring drill tools and methods, including rotary directional build angle drill tool and its inside continuous coring drill tool;Rotary directional build angle drill tool includes sequentially connected coring drill head, dynamic push back build angle device, positioning nipple and coring drill rod;Continuous coring drill tool includes sequentially connected coring tube, measurement and control guide flow nipple and positioning fishing mechanism and rope fishing device.The application combines dynamic push back rotary directional build angle and continuous rope coring, utilizes high-pressure flushing liquid provided by mud pump as driving power source, realizes build angle direction control by dynamic control flushing liquid flow passage mode, realizes efficient extraction core by rope fishing, can be while continuous sampling rock sample in borehole trajectory accurate control, improves the rock and mineral core acquisition rate and acquisition accuracy of geological drilling exploration, provides technical equipment support for mineral resources evaluation, underground engineering survey, geological disaster prevention and the like.

Description

Technical Field

[0001] This invention belongs to the field of geological exploration technology and relates to a continuous wireline coring drill bit and method for dynamic pushing and rotating directional drilling with flushing fluid. Background Technology

[0002] Core drilling is an important technical means for geological exploration, such as resource assessment, engineering investigation, and detection and verification of geological anomalies. The core recovery rate and the accuracy of the core location are important factors in evaluating the effectiveness of geological drilling.

[0003] Core drilling is a drilling method and process aimed at obtaining cylindrical rock cores. Wireline coring, reverse circulation coring and other techniques enable continuous rock core extraction without lifting the drill, resulting in high sampling efficiency. However, they cannot measure and control the borehole trajectory while drilling, which can lead to deviations from the target area and a low effective core recovery rate.

[0004] In recent years, to balance the needs of rock sampling and trajectory control, geological drilling has adopted an alternating approach of core drilling and directional drilling. When the actual drilling trajectory deviates little from the designed trajectory, core drilling is used for rock and mineral core extraction; when the actual drilling trajectory deviates from the designed trajectory, directional drilling is used to correct the deviation and bring the borehole back to the designed trajectory. This method has the following shortcomings:

[0005] (1) The inability to extract rock and mineral cores in directional drilling sections results in many invalid sections and a low overall core extraction rate.

[0006] (2) The two processes use different drilling tools. Switching between processes requires tripping the drill string to change the drilling tools, which results in high labor intensity for workers and low overall efficiency.

[0007] (3) Directional drilling and core drilling have different requirements for drilling equipment such as drilling rigs, mud pumps, and drilling tools. A large amount of drilling materials need to be prepared at the construction site, resulting in high equipment costs.

[0008] (4) Correction is only performed when the drilling trajectory deviates from the design trajectory, resulting in a lag in trajectory control and an need to improve accuracy.

[0009] (5) When directional drilling is carried out, a screw motor is used as the bottom-hole directional drilling tool and a sliding directional drilling method is used for trajectory correction. The screw motor has low rock breaking power and a narrow applicable stratum range, and cannot be used in hard rock. The sliding directional drilling trajectory has poor smoothness, which restricts the drilling depth of the core drilling. Summary of the Invention

[0010] To address the shortcomings of existing technologies, the present invention aims to provide a continuous wireline coring tool and method for dynamic flushing fluid pushing and rotating directional drilling, thereby solving the problems of difficulty in monitoring and controlling the coring trajectory during geological drilling exploration.

[0011] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0012] A continuous wireline coring drill string with dynamic flushing fluid push-back rotary directional drilling includes a rotary directional drilling string and a continuous coring drill string disposed therein; the rotary directional drilling string includes a coring drill bit, a dynamic push-back directional drilling device, a positioning sub and a coring drill rod connected in sequence; the continuous coring drill string includes a coring tube, a measurement and control guide sub and a positioning and retrieval mechanism connected in sequence, and a wireline retrieval device detachably connected to the positioning and retrieval mechanism;

[0013] After the continuous coring drill bit is positioned inside the rotary directional drilling tool, the high-pressure flushing fluid is controlled by the energy-saving control of the measuring and control guide section to flow into a certain channel in the dynamic push-back directional drilling device, and the push block of the push-back guide mechanism in that channel is radially pushed out and supported on the borehole wall to generate a directional force to control the directional direction. After the rope retrieval device is connected to the positioning and retrieval mechanism, the continuous coring drill bit can be pulled out of the borehole by pulling the rope retrieval device outward to extract the rock core in the coring tube, and the borehole trajectory data measured by the measuring and control guide section can be read. While the borehole trajectory is precisely controlled, continuous coring can be performed.

[0014] The present invention also includes the following technical features:

[0015] Specifically, the dynamic push-and-adjustment device includes an outer tube for inclination. The outer wall of the front part of the outer tube is provided with circumferentially distributed grooves as push chambers, and each push chamber is provided with a radially retractable push-and-adjustment guide mechanism. The inner wall of the rear part of the outer tube is provided with multiple circumferentially distributed guide ports and a positioning slope. The inner side wall of the outer tube is provided with multiple flow channels. The flow channel connecting the guide ports and the push chambers is a guide flow channel, and the flow channel connecting the push chambers and the front end of the outer tube is a pressure relief flow channel.

[0016] Specifically, the push-guide mechanism includes a reciprocating seat, a limiting screw, a spring A, and a push block; the limiting screw is arranged radially along the outer tube of the skew-forming tube, and the limiting screw passes vertically through the reciprocating seat and is screwed to the bottom of the push chamber; the spring A is sleeved on the limiting screw and rests between the nut of the limiting screw and the reciprocating seat; the push block is connected to the reciprocating seat and closely adheres to the side wall of the push chamber; when high-pressure liquid flows through the flow channel, it can radially push the reciprocating seat and compress the spring A, causing the push block to extend radially and support the hole wall to generate a skew-forming force.

[0017] Specifically, the measurement and control flow guide section includes a positioning distribution valve, a measurement and control outer pipe, and a transition joint connected in sequence;

[0018] The front end of the measurement and control outer tube is closed and has a small hole, while the rear end is open and connected to a transition joint. Inside, there is a servo motor, a control module, a power supply module, and a measurement module. The measurement module can measure the rotation speed, vibration, and drilling trajectory of the rotary directional drilling tool in real time. The drive shaft of the servo motor extends out of the small hole at the front end of the measurement and control outer tube.

[0019] The rear end of the positioning distribution valve is a blind hole, and a rotary distribution valve connected to the drive shaft of the servo motor is installed inside the blind hole. The outer wall of the front part of the positioning distribution valve is a sloping structure and can be matched with the positioning sloping surface of the dynamic push-and-adjustment device. The side wall of the positioning distribution valve is provided with circumferentially distributed positioning distribution valve ports, which can correspond one-to-one with the guide ports. The rotary distribution valve can make the positioning distribution valve ports and their corresponding guide ports connect, thereby controlling the push block of the push-and-adjustment mechanism to extend radially in a predetermined direction to generate an sloping force.

[0020] The transition connector is equipped with an aviation plug, which is electrically connected to the control module.

[0021] Specifically, the outer surface of the positioning distribution valve is a three-stage stepped surface. The outer diameter of the first step surface at the rear end is the same as the outer diameter of the measurement and control outer tube, which is smaller than the inner diameter of the dynamic push-and-shove directional device. The inner wall of the rear end of the first step surface is provided with a female thread for connecting to the measurement and control outer tube, and three rectangular flow ports are evenly distributed circumferentially. The outer diameter of the second step surface in the middle is larger than that of the first step surface, and sealing ring grooves A and B are provided at its front and rear ends. Three positioning distribution valve ports are evenly distributed circumferentially on the second step surface between the two sealing ring grooves. The third step surface at the front end is a sloping structure, which corresponds to and matches the positioning sloping surface of the dynamic push-and-shove directional device. The inner wall of the third step surface is provided with a female thread for connecting to the core tube.

[0022] Specifically, the number of flow guides, flow channels, push chambers, and pressure relief channels are the same and correspond one-to-one, forming a total of three sets;

[0023] The opening angle of the positioning distribution valve is 60°; the rotary distribution valve is a stepped cylindrical structure with a thinner rear and a thicker front, the rear cylinder is connected to the servo motor drive shaft, the outer diameter of the front cylinder is the same as the inner diameter of the positioning distribution valve, and a fan-shaped groove is provided along the circumference; the opening angle of the fan-shaped groove is 65° to 75°.

[0024] Specifically, the positioning and retrieval mechanism includes a sliding outer shell and a limiting ring A connected in sequence, as well as a retrieval spearhead disposed within the sliding outer shell; the rear of the retrieval spearhead is a conical structure extending out of the sliding outer shell, and the front is a two-stage stepped surface structure, with the diameter of the first stage surface at the rear being smaller than the diameter of the cone and larger than the diameter of the second stage surface; a rack is provided on the first stage surface, and a limiting ring B is connected to the front end of the rack; the second stage surface extends out of the limiting ring A, and its front end is connected to the transition joint of the measurement and control guide section; a spring B is fitted on the second stage surface, and the spring B is limited by the limiting ring A and the limiting ring B;

[0025] The sliding outer shell is symmetrically provided with two keyways, and two limiting blocks are inserted in the keyways. One end of the limiting block is semi-circular and is provided with a gear that cooperates with the rack of the retrieval spearhead. The other end is square and is chamfered at the right angle. The limiting block is positioned on the sliding outer shell by spring pin A.

[0026] The inner wall of the positioning section is provided with a limiting groove, which cooperates with the limiting block of the positioning and retrieval mechanism to limit the positioning and retrieval mechanism.

[0027] Specifically, the rope retrieval device includes a retrieval base with a three-step outer surface. The first step surface has a male thread for installing a locking nut to fix the core drilling rod. The outer diameter of the second step surface is the same as the inner diameter of the core drilling rod, and two keyways are machined on it. A retrieval hook is installed in the keyway through a spring pin B, and a spring C is connected to the rear of the retrieval hook. When the spring C is in a free state, the axis of the retrieval hook is parallel to the axis of the retrieval base. The retrieval hook can rotate around the spring pin B, and its front end has an L-shaped hook head with a guide slope at the front. The front end of the third step surface has an inner conical surface that matches the conical structure of the retrieval spearhead.

[0028] Specifically, the core drill bit adopts a ring structure; the core tube adopts a hollow structure; and the core drill rod adopts an inner and outer flat structure.

[0029] A method for dynamic flushing fluid pushing and shoving rotary directional drilling continuous wireline coring, the method being implemented based on the aforementioned dynamic flushing fluid pushing and shoving rotary directional drilling continuous wireline coring tool, includes the following steps:

[0030] Step 1: Connect the rotary directional drilling tool: Connect the core drill bit, dynamic pusher directional drilling tool, positioning sub and core drill rod in sequence, and lower them to the bottom of the borehole;

[0031] Step 2: Connection and lowering of continuous coring drill string: Based on the borehole design trajectory and actual drilling trajectory, formulate borehole trajectory control instructions and import them into the measurement and control guide section; after connecting the coring tube, measurement and control guide section and positioning and retrieval mechanism in sequence, place it into the rotary directional drilling tool; turn on the mud pump to inject high-pressure flushing fluid into the rotary directional drilling tool, and under the push of the high-pressure flushing fluid, the continuous coring drill string reaches the bottom of the hole and is keyed and positioned inside the rotary directional drilling tool;

[0032] Step 3: Rotary directional drilling: Start the mud pump to supply high-pressure flushing fluid into the rotary directional drilling tool. After the flushing fluid returns from the borehole, start the drilling rig to rotate the rotary directional drilling tool for annular drilling and rock breaking. During the drilling process, use the control guide sub to monitor the rotation speed of the rotary directional drilling tool in real time, and adjust the orientation of the rotary distribution valve according to the control command and the rotation speed of the rotary directional drilling tool to control the flow channel of the high-pressure flushing fluid. After the high-pressure flushing fluid enters the corresponding guide channel, it pushes out the corresponding push block and supports it on the borehole wall, generating a drilling trajectory directional force to control the drilling trajectory to drill in the predetermined direction; the cylindrical rock core generated during drilling enters the core sampler.

[0033] Step 4: Retrieval of Continuous Core Drilling String: After the core tube is filled with core, first stop rotating the rotary directional drilling string and lift it 10-20cm to break the core. Next, turn off the mud pump, retract all the push blocks of the dynamic pusher, and hold for 30-50 seconds. Measure the borehole trajectory parameters using the control guide sub. Then, place the rope retrieval device into the rotary directional drilling string and turn on the mud pump to inject high-pressure flushing fluid into the rotary directional drilling string. Driven by the high-pressure flushing fluid, the rope retrieval device reaches the continuous core drilling string and connects with the positioning retrieval spearhead. Then, use a winch to pull the rope retrieval device outwards to pull the continuous core drilling string out of the hole. Finally, remove the core from the core tube, disassemble the positioning retrieval mechanism, and read the borehole trajectory data measured by the control guide sub.

[0034] Step 5; Continuous directional coring: Repeat steps 2 to 4 to perform continuous directional coring until the designed hole depth is reached.

[0035] Compared with the prior art, the present invention has the following technical effects:

[0036] This invention employs a combination of dynamic push-and-rotate directional drilling and continuous wireline coring. It utilizes high-pressure flushing fluid provided by a drilling mud pump as the driving power source, dynamically controlling the flushing fluid flow channel to control the directional drilling direction, and efficiently extracting cores via wireline retrieval. This solves problems in geological drilling exploration such as high equipment costs, low overall efficiency, lagging trajectory control, low coring rate, narrow applicable strata range, and limited exploration distance. It allows for continuous rock sampling while precisely controlling the borehole trajectory, improving the core recovery rate and accuracy in geological drilling exploration, and providing technical equipment support for mineral resource assessment, underground engineering exploration, and geological disaster prevention.

[0037] The drilling tool of this invention has a simple structure and low purchase cost. A single set of drilling tools can achieve both directional drilling and continuous coring, reducing the amount of drilling equipment required and lowering equipment purchase costs.

[0038] This invention offers high overall efficiency for continuous directional coring. It combines precise borehole trajectory control with continuous coring capabilities, eliminating the need for frequent tripping in and out of the drill string, resulting in high overall efficiency.

[0039] This invention features high real-time trajectory control accuracy. During drilling, the borehole trajectory is measured in real-time and feedback control is implemented, improving the accuracy of borehole trajectory control and ensuring accurate coring.

[0040] This invention features a high core recovery rate. Cores can be retrieved from the entire directional borehole section, resulting in a high core recovery rate and ensuring that important stratigraphic information is not missed.

[0041] This invention is applicable to a wide range of formations and allows for deep coring. The drilling power comes from the borehole head drill, which is more than ten times more powerful than the bottom screw motor, thus improving drilling efficiency and the range of applicable formations. During borehole trajectory control, the drill rod keeps rotating, resulting in good borehole wall smoothness, low drilling and slag removal resistance, and facilitating deep-hole coring operations. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of a continuous wireline coring drill string with dynamic flushing fluid pushing and rotating directional drilling.

[0043] Figure 2 This is a schematic diagram of the dynamic push-and-adhesion tilter structure.

[0044] Figure 3 This is a schematic diagram of the dynamic pushing and guiding mechanism of the tilting device.

[0045] Figure 4 This is a structural schematic diagram of the AA section of the dynamic push-adjustment inclinometer.

[0046] Figure 5 This is a schematic diagram of the reciprocating seat structure.

[0047] Figure 6 This is a schematic diagram of the measurement and control flow guide section structure.

[0048] Figure 7 This is a schematic diagram of the BB cross-section of the measurement and control guide section.

[0049] Figure 8 This is a schematic diagram of the positioning distribution valve structure.

[0050] Figure 9 This is a schematic diagram of the positioning short section structure.

[0051] Figure 10 This is a schematic diagram of the positioning and salvage mechanism.

[0052] Figure 11 This is a schematic diagram of the rope retrieval device.

[0053] The meanings of the labels in the diagram are as follows:

[0054] 1. Core drill bit, 2. Dynamic push-and-adhesion directional control device, 3. Positioning sub, 4. Core drill pipe, 5. Core tube, 6. Measurement and control guide sub, 7. Positioning and retrieval mechanism, 8. Rope retrieval device, 9. Directional control outer tube, 10. Push-and-adhesion chamber, 11. Guide port, 12. Positioning inclined surface, 13. Guide flow channel, 14. Pressure relief flow channel, 15. Reciprocating seat, 16. Limit screw, 17. Spring A, 18. Push-and-adhesion block, 19. Positioning distribution valve, 20. Measurement and control outer tube, 21. Transition joint, 22. Servo motor, 23. 24. Control module, 25. Power supply module, 26. Measurement module, 27. Flow port, 28. Sealing ring groove A, 29. Sealing ring groove B, 30. Positioning distribution valve port, 31. Rotary distribution valve, 32. Aviation plug, 33. Limiting groove, 34. Sliding housing, 35. Limiting ring A, 36. Salvage spearhead, 37. Limiting ring B, 38. Spring B, 39. Limiting block, 40. Spring pin A, 41. Salvage seat, 42. Locking nut, 43. Spring C, 44. Spring pin B, 45. Salvage hook. Detailed Implementation

[0055] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0056] Example 1:

[0057] This embodiment provides a continuous wireline coring drill bit with dynamic push-back swivel directional drilling, including a swivel directional drilling tool and a continuous coring tool disposed inside the swivel directional drilling tool; the swivel directional drilling tool includes a coring drill bit 1, a dynamic push-back directional drilling device 2, a positioning sub 3 and a coring drill rod 4 connected in sequence; the continuous coring tool includes a coring tube 5, a measurement and control guide sub 6 and a positioning and retrieval mechanism 7 connected in sequence, and a wireline retrieval device 8 detachably installed with the positioning and retrieval mechanism.

[0058] After the continuous coring drill bit is positioned inside the rotary directional drilling tool, the control and guidance sub 6 can control the high-pressure flushing fluid to flow into a certain channel in the dynamic push-back directional drilling device 2, and cause the push block 18 of the push-back guide mechanism in that channel to be radially pushed out and supported on the borehole wall, so as to generate a directional force to control the directional direction; after the rope retrieval device 8 is connected to the positioning and retrieval mechanism 7, the continuous coring drill bit can be pulled out of the borehole by pulling the rope retrieval device 8 outward to extract the rock core in the coring tube 5, and the borehole trajectory data measured by the control and guidance sub 6 can be read, so as to continuously cor the drill bit while accurately controlling the borehole trajectory.

[0059] The dynamic push-and-adjust directional controller 2 includes a directional controller outer tube 9. The outer wall of the front part of the directional controller outer tube 9 is provided with circumferentially distributed grooves as push-and-adjustment chambers 10. Each push-and-adjustment chamber 10 is provided with a radially retractable push-and-adjustment guide mechanism. The inner wall of the rear part of the directional controller outer tube 9 is provided with multiple circumferentially distributed guide ports 11 and a positioning inclined surface 12. The inner side wall of the directional controller outer tube 9 is provided with multiple flow channels. The flow channel connecting the guide ports 11 and the push-and-adjustment chambers 10 is a guide flow channel 13, and the flow channel connecting the push-and-adjustment chambers 10 and the front end of the directional controller outer tube 9 is a pressure relief flow channel 14.

[0060] The push-guide mechanism includes a reciprocating seat 15, a limiting screw 16, a spring A17, and a push block 18. The limiting screw 16 is arranged radially along the skew-forming outer tube 9. The limiting screw 16 passes vertically through the reciprocating seat 15 and is screwed to the bottom of the push chamber 10. The spring A17 is sleeved on the limiting screw 16 and abuts between the nut of the limiting screw 16 and the reciprocating seat 15. The push block 18 is connected to the reciprocating seat 15 and is in close contact with the side wall of the push chamber 10. When high-pressure liquid flows through the flow channel, it can radially push the reciprocating seat 15 and compress the spring A17, causing the push block 18 to extend radially and support the hole wall to generate a skew-forming force.

[0061] Specifically, the outer tube 9 for inclination is provided with a male thread at the front end and a female thread at the rear end; three circular push chambers 10 are evenly arranged circumferentially on the outer surface of the outer tube 9 near the male thread, and three guide ports 11 and a positioning slope 12 are evenly arranged on the inner surface near the female thread; three guide channels 13 and three pressure relief channels 14 are provided in the body of the outer tube 9; the highest point of the positioning slope 12 is on the same cross-section as the center of one of the guide ports 11; a threaded hole is machined at the center of the push chamber 10. The limiting screw 16 is connected to the push-back chamber 10. Its front end is provided with a two-stage stepped surface. The first stepped surface is provided with a male thread corresponding to the threaded hole of the push-back chamber 10, and the second stepped surface is an external hexagonal structure. The reciprocating seat 15 is positioned in the push-back chamber 10 by the limiting screw 16. The center of the reciprocating seat 15 is provided with an inward-facing circular boss. The circular boss is provided with an internal hexagonal hole corresponding to the external hexagonal structure of the limiting screw 16. A spring A17 is provided between the reciprocating seat 15 and the limiting screw 16. A push-back block 18 is connected to the reciprocating seat 15. The push-back block 18 is provided with an internal hexagonal mounting hole.

[0062] The measurement and control flow guide section 6 includes a positioning distribution valve 19, a measurement and control outer pipe 20, and a transition joint 21 connected in sequence.

[0063] The front end of the measurement and control outer tube 20 is closed and has a small hole, while the rear end is open and connected to the transition joint 21. Inside it are a servo motor 22, a control module 23, a power supply module 24, and a measurement module 25. The measurement module 25 can measure the rotation speed, vibration, and drilling trajectory of the rotary directional drilling tool in real time. The drive shaft of the servo motor 22 extends out of the small hole at the front end of the measurement and control outer tube 20.

[0064] The rear end of the positioning distribution valve 19 is a blind hole, and a rotary distribution valve 30 connected to the drive shaft of the servo motor 22 is provided in the blind hole. The front outer wall of the positioning distribution valve 19 is a sloping structure and can be matched with the positioning sloping surface of the dynamic push-and-adjust device 2. The side wall of the positioning distribution valve 19 is provided with circumferentially distributed positioning distribution valve ports 29, which can correspond one-to-one with the guide ports 11. The rotary distribution valve 30 can make the positioning distribution valve ports 29 and their corresponding guide ports 11 connect, thereby controlling the push block 18 of the push-and-adjust mechanism to extend radially in a predetermined direction to generate an sloping force.

[0065] The transition connector 21 is equipped with an aviation plug 31, which is electrically connected to the control module 23.

[0066] The outer surface of the positioning distribution valve 19 is a three-step surface. The outer diameter of the first step surface at the rear end is the same as the outer diameter of the measuring and control outer tube 20. The outer diameter of the measuring and control outer tube 20 is smaller than the inner diameter of the dynamic push-and-shove 2. The inner wall of the rear end of the first step surface is provided with a female thread for connecting to the measuring and control outer tube 20, and three rectangular flow ports 26 are evenly distributed circumferentially. The outer diameter of the second step surface in the middle is larger than that of the first step surface. The front and rear ends of the second step surface are provided with sealing ring grooves A27 and B28. The second step surface between the two sealing ring grooves is evenly distributed circumferentially with three rectangular positioning distribution valve ports 29. The third step surface at the front end is a slope structure, which corresponds to and matches the positioning slope 12 of the dynamic push-and-shove 2. Its highest point is on the same cross section as the center line of one of the positioning distribution valve ports 29. The inner wall of the third step surface is provided with a female thread for connecting to the core tube 5.

[0067] The number of flow inlets 11, guide channels 13, push chambers 10, and pressure relief channels 14 are the same and correspond one-to-one, forming three groups. Each group of components is located on the same cross-section and is interconnected.

[0068] The opening angle of the positioning distribution valve port 29 is 60°; the rotary distribution valve 30 is a stepped cylindrical structure with a thinner rear and a thicker front. The rear cylinder is connected to the drive shaft of the servo motor 22, and the outer diameter of the front cylinder is the same as the inner diameter of the positioning distribution valve 19. A fan-shaped groove is provided along the circumference; the opening angle of the fan-shaped groove is 65° to 75°.

[0069] The positioning and salvage mechanism 7 includes a sliding outer shell 33 and a limiting ring A34 connected in sequence, and a salvage spearhead 35 disposed inside the sliding outer shell 33. The rear of the salvage spearhead 35 is a conical structure that extends out of the sliding outer shell 33, and the front is a two-stage stepped surface structure. The diameter of the first stage surface at the rear is smaller than the diameter of the cone and larger than the diameter of the second stage surface. A rack is provided on the first stage surface, and a male thread is provided at the front end of the rack. A limiting ring B36 is connected to the male thread. The second stage surface extends out of the limiting ring A34, and its front end is provided with a male thread that connects to the transition joint 21 of the measurement and control guide section 6. A spring B37 is fitted on the second stage surface, and the spring B37 is limited by the limiting ring A34 and the limiting ring B36.

[0070] Two keyways are symmetrically provided on the sliding housing 33. Two limiting blocks 38 are inserted in the keyways. One end of the limiting block 38 is semi-circular and has a gear that cooperates with the rack of the salvage spearhead 35. The other end is square and has a chamfer at the right angle. The limiting block 38 is positioned on the sliding housing 33 by a spring pin A39.

[0071] The inner wall of the positioning section 3 is provided with a limiting groove 32, which cooperates with the limiting block 38 of the positioning and retrieval mechanism 7 to limit the positioning and retrieval mechanism 7.

[0072] The rope retrieval device 8 includes a retrieval base 40, the outer surface of which has a three-step surface, specifically:

[0073] The first step surface is provided with male threads for installing and fixing the core-collecting rope with a locking nut 41;

[0074] The outer diameter of the second step surface is the same as the inner diameter of the core drill rod 4. Two keyways are machined on it. A retrieval hook 44 is installed in the keyway through a spring pin B43. The rear of the retrieval hook 44 is connected to a spring C42. The width of the keyway is the same as the thickness of the retrieval hook 44. When the spring C42 is in a free state, the axis of the retrieval hook 44 is parallel to the axis of the retrieval seat 40. The retrieval hook 44 can rotate around the spring pin B43. Its front end is provided with an L-shaped hook head, and a guide slope is provided at the front of the hook head.

[0075] The front end of the third step has an inner conical surface, which matches the conical structure of the retrieval spearhead 35.

[0076] In this embodiment, the core drill bit 1 adopts a ring structure; the core tube 5 adopts a hollow structure; and the core drill rod 4 adopts an inner and outer flat structure.

[0077] The monitoring and control guide section 6 measures its own vibration in real time and controls the guide section to operate in three modes based on the vibration frequency and amplitude:

[0078] State 1: Sleep mode: When the measured vibration frequency and amplitude are below the threshold, it is determined that the drilling is not started and the control guide section 6 is in sleep mode to save energy;

[0079] State 2: Rotation speed measurement and control mode: When the measured vibration frequency and amplitude are higher than the threshold, it is determined that the drilling is in progress. The measurement and control guide section 6 starts the rotation speed measurement function and uses the servo motor 22 to control the orientation of the rotary distribution valve 30 to control the drilling trajectory.

[0080] State 3: Drilling trajectory parameter measurement mode: When the measured vibration frequency and amplitude drop from above the threshold to below the threshold, it is determined that the drilling is stopped. The measurement and control guide section 6 starts the trajectory parameter measurement function and uses the stable data between 30 and 50 seconds of stillness as the drilling trajectory measurement data. After the measurement is completed, the measurement and control guide section 6 enters the sleep mode.

[0081] Example 2:

[0082] This embodiment provides a method for dynamic flushing fluid pushing and shoving rotary directional drilling continuous wireline coring, which is based on the dynamic flushing fluid pushing and shoving rotary directional drilling continuous wireline coring tool of Embodiment 1 above, and includes the following steps:

[0083] Step 1: Connect the rotary directional drilling tool: Connect the core drill bit 1, the dynamic pusher directional drilling tool 2, the positioning sub 3, and the core drill rod 4 in sequence, and lower them to the bottom of the borehole;

[0084] Step 2: Connection and lowering of continuous coring tool: Based on the borehole design trajectory and actual drilling trajectory, formulate borehole trajectory control instructions and import them into the measurement and control guide section 6; after connecting the coring tube 5, the measurement and control guide section 6 and the positioning and retrieval mechanism 7 in sequence, place it into the rotary directional drilling tool; turn on the mud pump to inject high-pressure flushing fluid into the rotary directional drilling tool, and under the push of the high-pressure flushing fluid, the continuous coring tool reaches the bottom of the hole and is positioned in the rotary directional drilling tool by a key;

[0085] Step 3: Rotary directional drilling: Start the mud pump to supply high-pressure flushing fluid into the rotary directional drilling tool in the hole. After the flushing fluid returns from the hole, start the drilling rig to rotate the rotary directional drilling tool for annular drilling and rock breaking. During the drilling process, the rotation speed of the rotary directional drilling tool is monitored in real time using the control guide section 6. The valve port orientation of the rotary distribution valve 30 is adjusted according to the control command and the rotation speed of the rotary directional drilling tool to control the flow channel of the high-pressure flushing fluid. After the high-pressure flushing fluid enters the corresponding guide channel 13, it pushes out the corresponding push block 18 and supports it on the hole wall, generating a drilling trajectory directional force to control the drilling trajectory to drill in the predetermined direction. The cylindrical rock core generated during drilling enters the core tube 5.

[0086] Step 4: Continuous Core Drilling Tool Retrieval: After the core tube 5 is filled with core, first stop rotating the rotary directional drilling tool, raise the rotary directional drilling tool 10-20cm, and cut off the core; then turn off the mud pump, and retract all the push blocks 18 of the dynamic pusher directional drilling tool 2, remain stationary for 30-50s, and measure the borehole trajectory parameters using the control guide sub 6; then place the rope retrieval device 8 into the rotary directional drilling tool, turn on the mud pump to inject high-pressure flushing fluid into the rotary directional drilling tool, and under the push of the high-pressure flushing fluid, the rope retrieval device 8 reaches the continuous core drill tool and connects with the positioning retrieval spearhead 35; then use the winch to pull the rope retrieval device 8 outwards to pull the continuous core drill tool out of the hole; finally, remove the core from the core tube 5, remove the positioning retrieval mechanism 7, and read the borehole trajectory data measured by the control guide sub 6.

[0087] Step 5; Continuous directional coring: Repeat steps 2 to 4 to perform continuous directional coring until the designed hole depth is reached.

[0088] During the rotary directional drilling in step three above, the continuous coring tool and the rotary directional drilling tool rotate synchronously.

[0089] Step two above, connecting and lowering the continuous coring drill bit, includes the following sub-steps:

[0090] Step 2.1: Importing borehole trajectory control commands: Connect the aviation plug 31 of the telemetry and control guide section 6 to the ground data processing host via a data cable, and import the borehole trajectory control commands to the telemetry and control guide section 6 through the ground processing host;

[0091] Step 2.2: Continuous coring tool lowering: The high-pressure flushing fluid provided by the mud pump pushes the continuous coring tool to move towards the bottom of the hole. During the movement, the limiting block 38 rotates towards the hole opening along the rack on the retrieval spearhead 35 under the constraint of the inner hole of the rotary directional drilling tool. It retracts inward until the outer diameter is smaller than the inner diameter of the rotary directional drilling tool, and at the same time drives the sliding outer shell 33 to move towards the rear end, compressing the spring B37.

[0092] Step 2.3: Positioning of the continuous coring tool: When the third step of the positioning distribution valve 19 of the control guide section 6 enters the positioning slope 12 of the dynamic pusher directional drilling device 2, the axial front end and circumferential front end of the continuous coring tool are limited under the guidance of the positioning slope 12 of the dynamic pusher directional drilling device 2. At this time, the limiting block 38 enters the limiting groove 32 of the positioning section 3. Under the action of the spring B37, the sliding shell 33 moves to the front end, driving the limiting block 38 to rotate and open along the rack on the retrieval spearhead 35 towards the bottom of the hole, supporting it in the limiting groove 32 of the positioning section 3, and limiting the axial rear end of the continuous coring tool.

[0093] The above step three, rotary directional drilling, includes the following sub-steps:

[0094] Step 3.1: Positioning of the rotary distribution valve 30 in the control guide section 6: Turn on the mud pump to provide high-pressure flushing fluid into the rotary directional drilling tool in the hole. The control guide section 6 starts working. According to the drilling trajectory control command, the servo motor 22 drives the rotary distribution valve 30 to rotate and rotate the rotary distribution valve 30 to the designated position.

[0095] Step 3.2: Dynamic control of flushing fluid flow channel: Using the directional drilling rig to rotate the rotary directional drilling tool, the flow control sub 6 measures the rotation speed of the rotary directional drilling tool in real time, and rotates the rotary distribution valve 30 in the opposite direction at the same speed, so that the orientation of the rotary distribution valve 30 remains unchanged; when the positioning distribution valve port 29 rotates into the relative angle range of the rotary distribution valve 30, the flushing fluid enters the positioning distribution valve port 29 along the rotary distribution valve 30 and enters the guide port 11 of the dynamic pusher directional drilling device 2; other positioning distribution valve ports 29 and guide ports 11 are closed, and no flushing fluid flows in;

[0096] Step 3.3: Dynamic Push-and-Side Deflection Correction: After the flushing fluid enters the guide port 11, it flows along the guide channel 13 to the push-and-side chamber 10. Due to the narrowing of the channel, under the high pressure of the flushing fluid, it pushes the reciprocating seat 15, which drives the push-and-side block 18 to extend radially along the borehole to the dynamic push-and-side deflection device 2, supporting it on the borehole wall. This, in turn, applies the opposite deflection force to the core drill bit 1, causing the borehole trajectory to deviate according to the design direction. After the high-pressure flushing fluid flows through the push-and-side chamber 10, it flows out along the pressure relief channel, enters the bottom of the borehole, cools the core drill bit 1, and carries the rock cuttings generated during drilling back out of the borehole.

[0097] Step 3.4: Continuous directional drilling and correction: When the rotary directional drilling tool rotates to break the rock, the positioning distribution valve port 29 of the control guide section 6 is connected to the rotary distribution valve 30 in sequence, and the corresponding push block 18 is pushed out in a fixed direction to support the borehole wall, forming a continuous directional drilling force and continuously controlling the drilling trajectory.

[0098] Step 3.5: Core extraction: The core drill bit 1 breaks the rock in an annular shape, and the cylindrical core produced in the center enters the core extraction tube 5.

[0099] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0100] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0101] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A continuous wireline coring drill string with dynamic flushing fluid pushing and directional drilling, characterized in that, It includes a rotary directional drilling tool and a continuous coring tool located inside it; the rotary directional drilling tool includes a coring bit (1), a dynamic pusher directional drilling device (2), a positioning sub (3), and a coring drill rod (4) connected in sequence; the continuous coring tool includes a coring tube (5), a measurement and control guide sub (6), and a positioning and retrieval mechanism (7) connected in sequence, as well as a rope retrieval device (8) detachably connected to the positioning and retrieval mechanism; After the continuous coring drill bit is positioned inside the rotary directional drilling tool, the measurement and control guide section (6) can control the high-pressure flushing fluid to flow into a certain channel in the dynamic push-back directional drilling device (2) and cause the push block (18) of the push-back guide mechanism in the channel to be radially pushed out and supported on the borehole wall to generate a directional force to control the directional direction; after the rope retrieval device (8) is connected to the positioning retrieval mechanism (7), the continuous coring drill bit can be pulled out of the hole by pulling the rope retrieval device (8) outward to extract the rock core in the coring tube (5), and the borehole trajectory data measured by the measurement and control guide section (6) can be read, so as to continuously coring while accurately controlling the borehole trajectory.

2. The flushing fluid dynamic pushing and shoving rotary directional drilling continuous wireline coring tool as described in claim 1, characterized in that, The dynamic push-back skewing device (2) includes a skewing outer tube (9). The outer wall of the front part of the skewing outer tube (9) is provided with circumferentially distributed grooves as push-back chambers (10). Each push-back chamber (10) is provided with a push-back guide mechanism that can retract radially. The inner wall of the rear part of the skewing outer tube (9) is provided with multiple circumferentially distributed guide ports (11) and a positioning inclined surface (12). The inner side wall of the skewing outer tube (9) is provided with multiple flow channels. The flow channel connecting the guide ports (11) and the push-back chambers (10) is a guide flow channel (13), and the flow channel connecting the push-back chambers (10) and the front end of the skewing outer tube (9) is a pressure relief flow channel (14).

3. The flushing fluid dynamic pushing and swerving rotary directional drilling continuous wireline coring tool as described in claim 2, characterized in that, The push-guide mechanism includes a reciprocating seat (15), a limiting screw (16), a spring A (17), and a push block (18). The limiting screw (16) is arranged radially along the skew-forming outer tube (9). The limiting screw (16) passes vertically through the reciprocating seat (15) and is screwed to the bottom of the push chamber (10). The spring A (17) is sleeved on the limiting screw (16) and the spring A (17) abuts between the nut of the limiting screw (16) and the reciprocating seat (15). The push block (18) is connected to the reciprocating seat (15) and closely adheres to the side wall of the push chamber (10). When high-pressure liquid flows through the flow channel, it can radially push the reciprocating seat (15) and compress the spring A (17) so that the push block (18) extends radially and supports the hole wall to generate a skew-forming force.

4. The flushing fluid dynamic pushing and swivel rotary directional drilling continuous wireline coring tool as described in claim 2, characterized in that, The measurement and control flow guide section (6) includes a positioning distribution valve (19), a measurement and control outer tube (20), and a transition joint (21) connected in sequence; The front end of the measurement and control outer tube (20) is closed and has a small hole, while the rear end is open and connected to the transition joint (21). Inside, there is a servo motor (22), a control module (23), a power supply module (24), and a measurement module (25). The measurement module (25) can measure the rotation speed, vibration, and drilling trajectory of the rotary directional drilling tool in real time. The drive shaft of the servo motor (22) extends out of the small hole at the front end of the measurement and control outer tube (20). The rear end of the positioning distribution valve (19) is a blind hole and a rotary distribution valve (30) connected to the drive shaft of the servo motor (22) is provided in the blind hole. The front outer wall of the positioning distribution valve (19) is a slope structure and can be matched with the positioning slope of the dynamic push-and-adjust device (2). The side wall of the positioning distribution valve (19) is provided with circumferentially distributed positioning distribution valve ports (29) and can correspond one-to-one with the guide port (11). The rotary distribution valve (30) can make the positioning distribution valve port (29) and its corresponding guide port (11) connect, thereby controlling the push block (18) of the push-and-adjust mechanism to extend radially in a predetermined direction to generate an inclined force. The transition connector (21) is equipped with an aviation plug (31), which is electrically connected to the control module (23).

5. The continuous wireline coring drill string with dynamic flushing fluid pushing and directional drilling as described in claim 4, characterized in that, The outer surface of the positioning distribution valve (19) is a three-stage stepped surface. The outer diameter of the first step surface at the rear end is the same as the outer diameter of the measuring and control outer tube (20). The outer diameter of the measuring and control outer tube (20) is smaller than the inner diameter of the dynamic push-and-adjust skewer (2). The inner wall of the rear end of the first step surface is provided with a female thread that connects to the measuring and control outer tube (20), and three rectangular flow ports (26) are evenly distributed along the circumference. The outer diameter of the second step surface in the middle is larger than that of the first step surface. The front and rear ends of the second step surface are provided with sealing ring grooves A (27) and B (28). The second step surface between the two sealing ring grooves is evenly distributed with three positioning distribution valve ports (29) along the circumference. The third step surface at the front end is a sloping structure that corresponds to and cooperates with the positioning sloping surface (12) of the dynamic push-and-adjust skewer (2). The inner wall of the third step surface is provided with a female thread that connects to the core tube (5).

6. The flushing fluid dynamic pushing and shoving rotary directional drilling continuous wireline coring tool as described in claim 5, characterized in that, The number of the flow guide (11), the flow guide channel (13), the push chamber (10), and the pressure relief channel (14) are the same and correspond one-to-one, forming a total of three groups; The opening angle of the positioning distribution valve port (29) is 60°; the rotary distribution valve (30) is a stepped cylindrical structure with a thinner rear and a thicker front. The rear cylinder is connected to the drive shaft of the servo motor (22), and the outer diameter of the front cylinder is the same as the inner diameter of the positioning distribution valve (19), and a fan-shaped groove is provided along the circumference; the opening angle of the fan-shaped groove is 65° to 75°.

7. The continuous wireline coring drill string with dynamic flushing fluid pushing and directional drilling as described in claim 1, characterized in that, The positioning and retrieval mechanism (7) includes a sliding outer shell (33) and a limiting ring A (34) connected in sequence, and a retrieval spearhead (35) disposed in the sliding outer shell (33); the rear part of the retrieval spearhead (35) is a conical structure that extends out of the sliding outer shell (33), and the front part is a two-stage stepped surface structure. The diameter of the first step surface located at the rear is smaller than the diameter of the cone and larger than the diameter of the second step surface; a rack is provided on the first step surface, and a limiting ring B (36) is connected to the front end of the rack; the second step surface extends out of the limiting ring A (34), and its front end is connected to the transition joint (21) of the measurement and control guide section (6); a spring B (37) is fitted on the second step surface, and the spring B (37) is limited by the limiting ring A (34) and the limiting ring B (36); The sliding outer shell (33) is symmetrically provided with two keyways, and two limiting blocks (38) are inserted in the keyways. One end of the limiting block (38) is semi-circular and is provided with a gear that cooperates with the rack of the salvage spearhead (35). The other end is square and is chamfered at the right angle. The limiting block (38) is positioned on the sliding outer shell (33) by spring pin A (39). The inner wall of the positioning section (3) is provided with a limiting groove (32), which cooperates with the limiting block (38) of the positioning and retrieval mechanism (7) to limit the positioning and retrieval mechanism (7).

8. The continuous wireline coring drill string with dynamic flushing fluid pushing and directional drilling as described in claim 7, characterized in that, The rope retrieval device (8) includes a retrieval base (40), the outer surface of which is a three-step surface; the first step surface is provided with a male thread for installing a locking nut (41) to fix the core drilling rope; the outer diameter of the second step surface is the same as the inner diameter of the core drilling rod (4), and two keyways are machined on it. A retrieval hook (44) is installed in the keyway through a spring pin B (43), and the rear of the retrieval hook (44) is connected to a spring C (42); when the spring C (42) is in a free state, the axis of the retrieval hook (44) is parallel to the axis of the retrieval base (40); the retrieval hook (44) can rotate around the spring pin B (43), and its front end is provided with an L-shaped hook head, and a guide slope is provided at the front of the hook head; the front end of the third step surface has an inner conical surface, which matches the conical structure of the retrieval spearhead (35).

9. The continuous wireline coring drill string with dynamic flushing fluid pushing and directional drilling as described in claim 1, characterized in that, The core drill bit (1) adopts a ring structure; the core tube (5) adopts a hollow structure; and the core drill rod (4) adopts an inner and outer flat structure.

10. A method for coring continuous ropes by dynamically pushing and propelling oscillating fluid to create a directional tilting profile, characterized in that, This method is based on the dynamic pushing and swirl of the flushing fluid to achieve the continuous wireline coring drill string as described in any one of claims 2 to 9, and includes the following steps: Step 1: Connecting the rotary directional drilling tool: Connect the core drill bit, dynamic pusher directional drilling tool, positioning sub and core drill rod in sequence, and lower them to the bottom of the borehole; Step 2: Connection and lowering of continuous coring drill string: Based on the borehole design trajectory and actual drilling trajectory, formulate borehole trajectory control instructions and import them into the measurement and control guide section; after connecting the coring tube, measurement and control guide section and positioning and retrieval mechanism in sequence, place it into the rotary directional drilling tool; turn on the mud pump to inject high-pressure flushing fluid into the rotary directional drilling tool, and under the push of the high-pressure flushing fluid, the continuous coring drill string reaches the bottom of the hole and is keyed and positioned inside the rotary directional drilling tool; Step 3: Rotary directional drilling: Start the mud pump to supply high-pressure flushing fluid into the rotary directional drilling tool. After the flushing fluid returns from the borehole, start the drilling rig to rotate the rotary directional drilling tool for annular drilling and rock breaking. During the drilling process, use the control guide sub to monitor the rotation speed of the rotary directional drilling tool in real time, and adjust the orientation of the rotary distribution valve according to the control command and the rotation speed of the rotary directional drilling tool to control the flow channel of the high-pressure flushing fluid. After the high-pressure flushing fluid enters the corresponding guide channel, it pushes out the corresponding push block and supports it on the borehole wall, generating a drilling trajectory directional force to control the drilling trajectory to drill in the predetermined direction; the cylindrical rock core generated during drilling enters the core sampler. Step 4: Retrieval of Continuous Core Drilling String: After the core tube is filled with core, first stop rotating the rotary directional drilling string and lift it 10-20cm to break the core. Next, turn off the mud pump, retract all the push blocks of the dynamic pusher, and hold for 30-50 seconds. Measure the borehole trajectory parameters using the control guide sub. Then, place the rope retrieval device into the rotary directional drilling string and turn on the mud pump to inject high-pressure flushing fluid into the rotary directional drilling string. Driven by the high-pressure flushing fluid, the rope retrieval device reaches the continuous core drilling string and connects with the positioning retrieval spearhead. Then, use a winch to pull the rope retrieval device outwards to pull the continuous core drilling string out of the hole. Finally, remove the core from the core tube, disassemble the positioning retrieval mechanism, and read the borehole trajectory data measured by the control guide sub. Step 5; Continuous directional coring: Repeat steps 2 to 4 to perform continuous directional coring until the designed hole depth is reached.

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