A drilling trajectory maintaining device for a flexible drilling tool used in prospecting engineering

Abstract

The present invention discloses a drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering, and relates to the technical field of flexible drilling tool equipment. The present invention aims to solve the problem that the existing flexible drill rod has poor integrity and is difficult to maintain a fixed arc or maintain a straight direction for drilling. It includes a drill bit, the drill bit is provided with evenly distributed connecting tubes, and the other connecting tubes are all fixedly connected with spherical joints, a fixing ring is fixedly connected in the connecting tube, a first sliding tube is slidably connected in the connecting tube, the first sliding tube is fixedly connected with a tension sensor, and the tension sensor is fixedly connected with a wire rope. The present invention actively pulls adjacent spherical joints through circumferentially evenly distributed steel wire ropes to change the rotation angle of adjacent spherical joints, thereby controlling the rotation angle between the spherical joint and the adjacent and ball-connected connecting tubes, avoiding excessive deflection of adjacent connecting tubes when subjected to the reaction force of the drill bit and the rock wall, thereby ensuring that the drilling trajectory of the drill bit will not be deflected.

Description

Technical Field

[0001] The invention relates to the technical field of flexible drilling tool equipment, and in particular discloses a drilling trajectory maintaining device for a flexible drilling tool used in prospecting engineering. Background Art

[0002] In the mining project, ultra-short radius horizontal well drilling technology is often used for prospecting. Ultra-short radius horizontal wells are drilled using flexible or semi-flexible drilling tools connected by multiple short sections. The flexible drilling tools drill along a predetermined path with a smaller curvature in the well, thereby reducing invalid drilling paths and increasing drilling efficiency. Existing flexible or semi-flexible drilling tools are connected by multiple short sections of drill pipe. The drill pipe is divided into a fixed sleeve for transmitting the thrust on the well and a rotating shaft for transmitting the torque on the well. The two adjacent fixed sleeves are limited by a ball joint, and the two adjacent rotating shafts are connected by a coupling. Therefore, the integrity of the drill pipe during the drilling process is improved. The existing flexible drill rod is difficult to maintain a fixed arc or a fixed straight rod form for drilling. When the drill bit is drilling harder rock, the driving force on the flexible drill rod and the resistance when drilling the rock can easily cause the flexible drill rod to deflect irregularly, resulting in excessive deflection of multiple interconnected fixing sleeves near the drill bit, causing the direction of the drill bit to deviate from the predetermined direction, thereby causing the drilling trajectory of the drill bit to deviate. The staff needs to frequently adjust the drilling direction of the drill bit to correct the drilling trajectory of the drill bit. Therefore, it is difficult for the staff to maintain the drill bit to drill along the predetermined trajectory. Summary of the invention

[0003] In order to overcome the shortcomings of the existing flexible drill rods, such as poor integrity and difficulty in maintaining a fixed arc or a straight direction for drilling, the present invention provides a drilling trajectory maintaining device for a flexible drill tool for prospecting engineering.

[0004] The technical solution is: a drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering, comprising a drill bit, the drill bit is provided with evenly distributed connecting tubes, the connecting tube close to the drill bit is fixedly connected to the drill bit, and the other connecting tubes are fixedly connected to a spherical joint on the side close to the drill bit, the connecting tube is far away from the drill bit and is limited by the adjacent spherical joint, a fixing ring is fixedly connected to the side of the connecting tube away from the drill bit, a transmission shaft is slidably connected in the fixing ring, the input shaft of the drill bit is fixedly connected to the adjacent transmission shaft, a coupling is installed between two adjacent transmission shafts, the transmission shaft is located in adjacent connecting tubes, a first sliding tube is slidably connected in the connecting tube, a tension sensor is fixedly connected to the side of the first sliding tube away from the drill bit, the tension sensor is fixedly connected to a wire rope, the wire rope is fixedly connected to the adjacent spherical joint, the first sliding tube is threadedly connected to a first threaded rod, and the first threaded rod is rotatably connected to the adjacent connecting tube.

[0005] Furthermore, a rotating ring is rotatably connected inside the spherical joint, and a pressing ring is fixedly connected to a side of the rotating ring close to the adjacent fixed ring, and the pressing ring is pressed and matched with the adjacent fixed ring.

[0006] Furthermore, the contact points between the extrusion ring and the adjacent fixed ring are both spherical surfaces, and the center of the extrusion ring surface and the center of the adjacent fixed ring surface both coincide with the center of the adjacent spherical joint.

[0007] Furthermore, the outer side surface of the extrusion ring is circular, the inner side of the extrusion ring is a waist-shaped hole, the transmission shaft slides in the waist-shaped hole of the adjacent extrusion ring, the radius of the transmission shaft is smaller than the radius of the waist-shaped hole on the adjacent extrusion ring, and the difference between the two is less than 1mm.

[0008] Furthermore, a micro motor is fixedly connected in the spherical joint, teeth grooves evenly distributed circumferentially are arranged in the rotating ring, and a gear meshing with the teeth grooves evenly distributed circumferentially on the adjacent rotating ring is fixedly connected to the output shaft of the micro motor.

[0009] Furthermore, the width of the tooth groove in the rotating ring is greater than the width of the gear on the adjacent micromotor output shaft, and the preload force between the rotating ring and the adjacent spherical joint is greater than the preload force between the connecting tube and the adjacent spherical joint away from the drill bit.

[0010] Furthermore, the connecting cylinder is fixedly connected with uniformly distributed first electric rotating shafts, the first electric rotating shafts are coaxial with the adjacent first threaded rods, and the first electric rotating shafts are connected with the adjacent first threaded rods via splines.

[0011] Furthermore, it also includes a fixing mechanism for fixing adjacent spherical joints and evenly distributed, the fixing mechanism is arranged on a side of the adjacent connecting tube close to the adjacent fixing ring, the fixing mechanism includes a second electric shaft, the second electric shaft is installed on a side of the adjacent connecting tube close to the adjacent fixing ring, the connecting tube is rotatably connected with a second threaded rod on the side close to the adjacent second electric shaft, the second threaded rod is spline-connected to the adjacent second electric shaft, the second threaded rod is threadedly connected with a second sliding tube, the second sliding tube is fixedly connected with a sliding ring, the sliding ring is fixedly connected with an extrusion block evenly distributed in the circumferential direction, the connecting tube is slidably connected with a first limit block evenly distributed in the circumferential direction on the side away from the drill bit, the first limit block is limitedly matched with the adjacent spherical joint, the first limit block is slidably connected with the second limit block, the second limit block is extrusion-matched with the adjacent extrusion block, the spherical joint is slidably connected with an extrusion plate evenly distributed in the circumferential direction, a spring is fixedly connected between the extrusion plate and the adjacent spherical joint, and the extrusion plate is extrusion-matched with the adjacent first limit block.

[0012] Furthermore, the extrusion block is provided with an inclined surface, and the angle between the inclined surface of the extrusion block and the axial direction of the adjacent connecting cylinder is less than 30°. The extrusion block is extruded and matched with the adjacent second limiting block through its inclined surface.

[0013] Furthermore, the first limit block is slidably connected to symmetrically distributed sliding blocks, tension springs are fixed between the symmetrically distributed sliding blocks, the symmetrically distributed sliding blocks are squeezed and matched with adjacent second limit blocks, and the sliding blocks are squeezed and matched with adjacent spherical joints.

[0014] The beneficial effects of the present invention are as follows: the present invention actively pulls adjacent spherical joints through circumferentially evenly distributed steel wire ropes to change the rotation angle of the adjacent spherical joints, thereby controlling the rotation angle between the spherical joints and the adjacent and ball-connected connecting tubes, avoiding excessive deflection of the adjacent connecting tubes when subjected to the reaction force of the drill bit and the rock wall, thereby ensuring that the drilling trajectory of the drill bit will not deviate.

[0015] The present invention increases the contact area between the spherical joint and the adjacent ball-jointed connecting tube by extruding and fitting the extrusion ring with the adjacent fixing ring, increases the force stability between the spherical joint and the adjacent ball-jointed connecting tube, and avoids plastic deformation of the connection between the spherical joint and the adjacent ball-jointed connecting tube.

[0016] The present invention locks the spherical joint and the adjacent ball-jointed connecting tube by means of a fixing mechanism, and fixes the adjacent spherical joint with auxiliary circumferentially evenly distributed steel wire ropes. When the locking mechanism gradually fails due to wear, the locking force for the spherical joint and the adjacent ball-jointed connecting tube is enhanced, thereby ensuring the drilling effect when the drill bit drills in a straight line. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the drill bit, the connecting tube and the spherical joint of the present invention;

[0019] Figure 3 It is a cross-sectional view of the connecting tube, the spherical joint and the fixing ring of the present invention;

[0020] Figure 4 is a cross-sectional view of the ball joint, the fixing ring and the transmission shaft of the present invention;

[0021] Figure 5 An exploded view of the fixed ring, the rotating ring and the extrusion ring of the present invention;

[0022] Figure 6 It is a special state diagram of the connecting cylinder, the fixing ring and the transmission shaft of the present invention;

[0023] Figure 7 It is a three-dimensional structural schematic diagram of the connecting cylinder, the fixing ring and the transmission shaft of the present invention;

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the connecting cylinder, the first threaded rod and the first electric rotating shaft of the present invention;

[0025] Fig. 9 It is a schematic diagram of the three-dimensional structure of the connecting cylinder, the second electric rotating shaft and the second threaded rod of the present invention;

[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the sliding ring, the first limit block and the second limit block of the present invention.

[0027] The marks in the accompanying drawings are: 1-drill bit, 2-connecting cylinder, 3-spherical joint, 4-fixed ring, 5-transmission shaft, 6-coupling, 7-rotating ring, 8-extrusion ring, 9-micro motor, 10-first sliding cylinder, 101-tension sensor, 11-wire rope, 12-first threaded rod, 13-first electric rotating shaft, 14-second electric rotating shaft, 15-second threaded rod, 16-second sliding cylinder, 17-sliding ring, 18-extrusion block, 19-first limit block, 20-second limit block, 21-extrusion plate, 22-sliding block. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] Embodiment 1: Because the integrity of existing flexible drilling tools is poor, when the drill bit encounters harder rock, the resistance encountered by the drill bit during drilling and the thrust delivered downward from the well are difficult to maintain on the same straight line, which leads to irregular torsional deflection between the drill bit and the adjacent fixed sleeve. When the fixed sleeve near the drill bit is excessively deflected, it is easy to cause the direction of the drill bit to deviate from the predetermined direction, which in turn causes the drilling trajectory of the drill bit to deviate. In order to ensure that the drill bit always drills along the predetermined trajectory, the staff must frequently adjust the drilling direction of the drill bit to reduce the error between the drilling trajectory of the drill bit and the predetermined trajectory. This method will undoubtedly make the work of the staff more difficult and the workload greater.

[0030] In view of the above problems, the present invention proposes a drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering, as shown in the attached Figure 1 -Attached Figure 8As shown, it includes a drill bit 1, and the drill bit 1 is provided with necessary devices such as a hydraulic motor for guiding, a guide blade, a signal transmission device and a remote control device. A plurality of evenly distributed connecting tubes 2 are provided on the right side of the drill bit 1. The leftmost connecting tube 2 is fixedly connected to the drill bit 1, and the left sides of the other connecting tubes 2 are fixedly connected to a spherical joint 3. The right side of the connecting tube 2 is connected to the adjacent spherical joint 3 by a limiting ball joint (as shown in the attached figure). Figure 3 and attached Figure 4As shown in the figure, a fixing ring 4 is fixedly connected to the right side of the connecting tube 2, and a transmission shaft 5 is slidably connected in the fixing ring 4. The transmission shaft 5 is used to transmit the rotational power to the drill bit 1. The input shaft of the drill bit 1 is fixedly connected to the adjacent transmission shaft 5. A coupling 6 is installed between two adjacent transmission shafts 5. The coupling 6 is used to transmit the power between the two adjacent transmission shafts 5. The transmission shaft 5 is located in the adjacent connecting tube 2. A rotating ring 7 is rotatably connected in the spherical joint 3. An extrusion ring 8 is fixedly connected to the left side of the rotating ring 7. The contact points between the extrusion ring 8 and the adjacent fixing ring 4 are spherical. The spherical center of the extrusion ring 8 and the spherical center of the adjacent fixing ring 4 coincide with the spherical center of the adjacent spherical joint 3. The extrusion ring 8 is extruded and matched with the adjacent fixing ring 4, so that the adjacent connecting tube 2 provides the adjacent and right spherical joint 3. The outer side of the extrusion ring 8 is circular, and the inner side of the extrusion ring 8 is a waist-shaped hole. The transmission shaft 5 slides in the waist-shaped hole of the adjacent extrusion ring 8. The waist-shaped hole is only used to facilitate the swing of the adjacent transmission shaft 5 in the adjacent extrusion ring 8. Therefore, the length of the waist-shaped hole is set according to the farthest distance of the adjacent transmission shaft 5 swinging in a single direction. The radius of the transmission shaft 5 is smaller than the radius of the waist-shaped hole on the adjacent extrusion ring 8, and the difference between the two is less than 1mm, so as to ensure that the transmission shaft 5 and the adjacent extrusion ring 8 will not contact each other, and the contact area between the extrusion ring 8 and the adjacent fixed ring 4 is increased as much as possible. A micro motor 9 electrically connected to the remote control device is fixed in the spherical joint 3, and the rotating ring 7 The micromotor 9 is provided with circumferentially evenly distributed tooth grooves, and the output shaft of the micromotor 9 is fixedly connected with a gear meshing with the circumferentially evenly distributed tooth grooves on the adjacent rotating ring 7. The micromotor 9 is used to drive the adjacent rotating ring 7 to rotate, so that the adjacent transmission shaft 5 always swings along the waist round hole of the adjacent extrusion ring 8 to adapt to the situation that the transmission shaft 5 swings in different directions. The width of the tooth groove in the rotating ring 7 is greater than the width of the gear on the output shaft of the adjacent micromotor 9. Therefore, the output shaft of the micromotor 9 will not bear the extrusion force between the adjacent rotating ring 7 and the adjacent ball joint 3. The pre-tightening force between the rotating ring 7 and the adjacent ball joint 3 is greater than the pre-tightening force between the connecting tube 2 and the adjacent and right ball joint 3. Therefore, when the ball joint 3 and the adjacent connecting tube 2 rotate frequently, the first First, wear the connection between the rotating ring 7 and the adjacent spherical joint 3 to reduce the wear of the ball joint between the spherical joint 3 and the adjacent connecting tube 2. The first sliding tube 10 is slidably connected in the connecting tube 2. The right side of the first sliding tube 10 is fixedly connected with a tension sensor 101 electrically connected to the remote control device. The tension sensor 101 is fixedly connected with a wire rope 11. The wire rope 11 is fixedly connected to the adjacent spherical joint 3. The four wire ropes 11 cooperate with each other to pull the adjacent spherical joint 3 to rotate, thereby accurately controlling the rotation direction of the adjacent spherical joint 3. The left side of the first sliding tube 10 is threadedly connected with a first threaded rod 12. The first threaded rod 12 is rotatably connected to the adjacent connecting tube 2. The first threaded rod 12 forms a self-locking relationship with the adjacent first sliding tube 10 to pull the wire rope 11 more stably.The connecting tube 2 is fixed with first electric rotating shafts 13 which are evenly distributed and electrically connected to the remote control device. The first electric rotating shafts 13 are coaxial with the adjacent first threaded rods 12. The first electric rotating shafts 13 are connected with the adjacent first threaded rods 12 through splines, so the first electric rotating shafts 13 do not bear the tension of the adjacent first threaded rods 12.

[0031] When the staff uses the device for drilling operations, the staff controls the opening direction of the guide blades in the drill bit 1 through the remote control device, and then controls the drilling direction of the drill bit 1. The staff transmits the power to control the rotation of the drill bit 1 through the transmission shaft 5 and the coupling 6 connected in sequence. When the staff controls the drill bit 1 to change the drilling direction, the staff sequentially controls the four first electric shafts 13 on all the connecting tubes 2 to work, so that the multiple connecting tubes 2 are driven by the adjacent first electric shafts 13 and adjacent components and are actively deflected in the drilling direction of the drill bit 1 in sequence as the drilling process progresses. Take the upward deflection of the drill bit 1 as an example (refer to Figure 6 position):

[0032] The staff controls the three first electric rotating shafts 13 on the upper side through the remote control device to drive the adjacent first threaded rods 12 to rotate. The first threaded rods 12 rotate to control the adjacent first sliding cylinders 10 to move a certain distance to the left. The first sliding cylinders 10 and the tension sensor 101 tighten the adjacent steel wire ropes 11. The staff controls the first electric rotating shafts 13 on the lower side through the remote control device to drive the adjacent first threaded rods 12 to rotate. The first threaded rods 12 rotate to control the adjacent first sliding cylinders 10 to move a certain distance to the right. The first sliding cylinders 10 and the tension sensor 101 loosen the adjacent steel wire ropes 11. The four steel wire ropes 11 are The wire ropes 11 work together to pull the adjacent spherical joints 3 to deflect relative to the adjacent connecting tubes 2, thereby controlling the two connecting tubes 2 at that location to deflect by a certain angle. The remote control device sequentially controls the connecting tube 2 on the right and the transmission shaft 5 therein to deflect by a fixed angle in the above manner, thereby optimizing the force relationship between the connecting tube 2 and the drill bit 1, and preventing some of the connecting tubes 2 from being excessively deflected due to the reaction force of the drill bit 1 and the rock wall, causing the support force on the drill bit 1 to deviate from the drilling angle expected by the staff, resulting in additional deflection of the drill bit 1 during the drilling process, causing the drill bit 1 to deviate during the rotational drilling process.

[0033] When the staff is ready to control the rotation of the spherical joint 3 relative to the connecting tube 2 on its left side, the staff starts the micro motor 9 through the remote control device. The micro motor 9 drives the adjacent rotating ring 7 to rotate through the gear of its output shaft, and the rotating ring 7 drives the adjacent extrusion ring 8 to rotate until the waist hole of the extrusion ring 8 rotates to the direction in which the long axis of the waist hole coincides with the direction in which the connecting tube 2 is ready to deflect. At this time, the remote control device turns off the micro motor 9. Subsequently, when the staff controls the rotation between the spherical joint 3 and the adjacent connecting tube 2, the transmission shaft 5 rotates along the waist hole of the adjacent extrusion ring 8. The inner wall of the extrusion ring 8 will not hinder the transmission shaft 5 from rotating with the connecting tube 2. In the process of the spherical joint 3 driving the rotating ring 7 and the extrusion ring 8 to rotate together, the extrusion ring 8 rotates along the spherical surface of the fixed ring 4. When the staff controls the drill bit 1 to drill, the connecting tube 2 and the spherical joint 3 on the right side receive the support force transmitted to the spherical joint 3 by the fixed ring 4 through the extrusion ring 8 and the rotating ring 7.

[0034] Because the spherical surfaces on the rotating ring 7 and the extrusion ring 8 are concentric with the spherical surfaces of the adjacent spherical joints 3, and the contact surfaces of the rotating ring 7 and the extrusion ring 8 are closer to the direction of the drilling resistance on the vertical drill bit 1, the force areas of the rotating ring 7 and the extrusion ring 8 are larger than the force areas between the conventional connecting tube 2 and the spherical joint 3. Therefore, the force between the extrusion ring 8 and the fixed ring 4 is more stable than the force between the conventional connecting tube 2 and the spherical joint 3. After rotation occurs between the connecting tube 2 and the spherical joint 3, a stable force relationship can still be maintained between the extrusion ring 8 and the fixed ring 4. The supporting force between the connecting tube 2 and the spherical joint 3 will not be deflected due to rotation. Therefore, the drill bit 1 will not be deflected due to uneven force on the connected connecting tube 2, resulting in a deviation in the drilling direction of the drill bit 1.

[0035] When the spherical joint 3 and the connecting tube 2 are subjected to the reaction force of the drill bit 1 and the force that promotes the deflection between the spherical joint 3 and the connecting tube 2 with which the spherical joint is ball-connected, the tension between the wire rope 11 and the adjacent spherical joint 3 changes, and part of the wire rope 11 is subjected to a greater force. At this time, the wire rope 11 pulls the adjacent first sliding tube 10 through the tension sensor 101. The first sliding tube 10 is limited by the thread of the adjacent first threaded rod 12 to provide a force to resist the tension. At this time, the first threaded rod 12 is limited by the adjacent connecting tube 2 to provide the resistance, and the adjacent first electric shaft 13 is spline-connected to the first threaded rod 12. Therefore, the first electric shaft 13 will not be subjected to additional axial force, thereby providing protection for the first electric shaft 13. The first electric shaft 13 only needs to provide a torsional force to drive the adjacent first threaded rod 12 to rotate, thereby preventing the first electric shaft 13 from being subjected to a large axial force and being damaged.

[0036] When the staff finishes drilling, they take out the drill bit 1, the connecting tube 2 and other parts in sequence along the wellbore.

[0037] Embodiment 2: Based on embodiment 1, as shown in the attached Figure 7 , Attachment Fig. 9 and attached Fig.10 As shown, it also includes a fixing mechanism that is arranged on the right side of the connecting cylinder 2 and is evenly distributed. The number of the fixing mechanisms is the same as the number of the connecting cylinders 2. The fixing mechanism is used to fix the adjacent spherical joint 3. The fixing mechanism includes a second electric shaft 14 that is electrically connected to the remote control device. The second electric shaft 14 is installed on the right side of the adjacent connecting cylinder 2. The right side of the connecting cylinder 2 is rotatably connected with a second threaded rod 15. The second threaded rod 15 is spline-connected to the adjacent second electric shaft 14, so the second electric shaft 14 does not bear the tension of the adjacent second threaded rod 15. The second threaded rod 15 is threadedly connected to a second sliding cylinder 16. A self-locking structure is formed between the second threaded rod 15 and the adjacent second sliding cylinder 16. A sliding ring 17 is fixed to the right part of the second sliding cylinder 16. Four extrusion blocks 18 evenly distributed circumferentially are fixed to the right part of the sliding ring 17. Four first limit blocks 19 evenly distributed circumferentially are slidably connected to the right side of the connecting cylinder 2. The spherical joint 3 is provided with four grooves evenly distributed circumferentially. The first limit block 19 is inserted into The groove of the adjacent spherical joint 3 limits the adjacent spherical joint 3. The first limit block 19 is slidably connected to the second limit block 20. The extrusion block 18 is provided with an inclined surface. The angle between the inclined surface of the extrusion block 18 and the axial direction of the adjacent connecting tube 2 is less than 30°. Therefore, when the extrusion block 18 squeezes the adjacent second limit block 20 through its inclined surface, the extrusion block 18 only needs a small force to push the adjacent second limit block 20 to move. The groove of the spherical joint 3 is slidably connected to four extrusion blocks evenly distributed in the circumference. The extrusion plate 21 is fixedly connected with a spring between the extrusion plate 21 and the adjacent spherical joint 3. The extrusion plate 21 is extruded and matched with the adjacent first limit block 19 to release the limit of the adjacent first limit block 19 on the adjacent spherical joint 3. The first limit block 19 is slidably connected with two symmetrically distributed sliding blocks 22. A tension spring is fixedly connected between the two sliding blocks 22. The tension force of the tension spring on the sliding block 22 is greater than the elastic force of the spring on the adjacent extrusion plate 21. The two sliding blocks 22 are extruded and matched with the adjacent second limit block 20 (as shown in the attached Fig.10 As shown), the sliding block 22 is squeezed and matched with the adjacent spherical joint 3, and the sliding block 22 is used to supplement the worn area between the first limit block 19 and the adjacent spherical joint 3, thereby ensuring that the spherical joint 3 and the adjacent connecting tube 2 are always in a fixed state.

[0038] When the staff needs to control the drill bit 1 to drill in a straight line, the staff first controls the first electric shaft 13 and adjacent parts through the remote control device to drive the first sliding cylinder 10 and other parts to move. The first sliding cylinder 10 pulls the adjacent spherical joint 3 to rotate through the adjacent wire rope 11, so that the two adjacent connecting cylinders 2 are in a parallel state. At this time, the extrusion plate 21 on the spherical joint 3 is aligned with the adjacent first limit block 19. The staff controls the second electric shaft 14 through the remote control device to drive the second threaded rod 15 and other parts to rotate. The second threaded rod 15 drives the adjacent second sliding cylinder 16 to move to the right through the thread. The second sliding cylinder 16 pushes the adjacent four extrusion blocks 18 to move to the right together through the sliding ring 17. The extrusion blocks 18 move to the right through the tilting The inclined surface squeezes the adjacent second limit block 20, and the second limit block 20 is squeezed to drive the two adjacent sliding blocks 22, the adjacent first limit block 19 and the adjacent extrusion plate 21 to move toward the axis of the connecting tube 2. The two sliding blocks 22 and the adjacent first limit blocks 19 are inserted into the adjacent grooves on the adjacent spherical joints 3 together, and the spring on the extrusion plate 21 is compressed. When the extrusion plate 21 moves to the extreme position, the remote control device controls the second electric shaft 14 to stop rotating. At this time, the positions of the connecting tube 2 and the spherical joint 3 of the ball joint are relatively locked, and the two are in a fixed state, so that the connecting tube 2 on the right side of the drill bit 1 remains in a horizontal state, thereby further stabilizing the support force received by the drill bit 1 during the drilling process, thereby assisting the drill bit 1 to drill along a straight line.

[0039] When the drill bit 1 is subjected to excessive force during the drilling process, and the fitting between the first limit block 19 and the adjacent spherical joint 3 is worn, the connection between the adjacent connecting tube 2 and the adjacent spherical joint 3 gradually loses stability. At this time, the amplitude of vibration of the connecting tube 2 and the adjacent spherical joint 3 when the drill bit 1 is subjected to force during the drilling process gradually increases. When the spherical joint 3 is vibrated, the adjacent tension sensors 101 are continuously dragged through the adjacent four wire ropes 11. The tension sensors 101 on the adjacent four first sliding tubes 10 detect unstable tension signals. The tension sensors 101 transmit signals to the remote control device. After receiving the signals, the remote control device controls the second electric shaft 14 to rotate again to control the second sliding tube 16, the sliding ring 17 and the extrusion block 1 8 and other parts move further to the right, and the extrusion block 18 squeezes the adjacent second limit block 20 through the inclined surface and continues to move toward the axis of the connecting tube 2. At this time, the first limit block 19 and the adjacent extrusion plate 21 cannot move further because they have moved to the limit position, and the second limit block 20 squeezes the two adjacent sliding blocks 22 through its lower inclined surface. The sliding block 22 is forced to move toward the outside of the adjacent first limit block 19, and the sliding block 22 is squeezed and matched with the adjacent spherical joint 3 to further tighten the spherical joint 3. The tension spring between the two adjacent sliding blocks 22 is stretched and stored. At this time, the connection between the spherical joint 3 and the adjacent connecting tube 2 is further reinforced, reducing the vibration amplitude between the connecting tube 2 and the adjacent and ball-connected spherical joint 3.

[0040] When the staff needs the drill bit 1 to drill along a curved path, the staff controls the second electric shaft 14 to rotate and reset through the remote control device. The rotation of the second electric shaft 14 drives the adjacent parts to rotate and reset. The sliding block 22 and the extrusion plate 21 push the adjacent parts to reset under the action of the adjacent tension springs and the adjacent springs respectively. The connecting tube 2 releases the connection with the adjacent and ball-connected spherical joint 3, so that the connecting tube 2 and the adjacent spherical joint 3 can swing accordingly during the subsequent drilling process.

[0041] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering, comprising a drill bit (1), wherein the drill bit (1) is provided with evenly distributed connecting tubes (2), wherein the connecting tube (2) close to the drill bit (1) is fixedly connected to the drill bit (1), and the other connecting tubes (2) are fixedly connected to a spherical joint (3) on one side close to the drill bit (1), and the connecting tube (2) is limitedly connected to an adjacent spherical joint (3) on the side away from the drill bit (1), and a fixing ring (4) is fixedly connected to the side of the connecting tube (2) away from the drill bit (1), and a transmission shaft (5) is slidably connected in the fixing ring (4), and the input shaft of the drill bit (1) is fixedly connected to the adjacent transmission shaft (5), and a coupling (6) is installed between two adjacent transmission shafts (5), and the transmission shaft (5) is located in the adjacent connecting tube (2), wherein: It also includes uniformly distributed first sliding cylinders (10), wherein the first sliding cylinders (10) are slidably connected to the adjacent connecting cylinders (2), a tension sensor (101) is fixedly connected to the side of the first sliding cylinder (10) away from the drill bit (1), the tension sensor (101) is fixedly connected to a steel wire rope (11), the steel wire rope (11) is fixedly connected to the adjacent spherical joint (3), the first sliding cylinder (10) is threadedly connected to a first threaded rod (12), and the first threaded rod (12) is rotationally connected to the adjacent connecting cylinder (2).

2. The drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering according to claim 1 is characterized by: A rotating ring (7) is rotatably connected inside the spherical joint (3), and a pressing ring (8) is fixedly connected to one side of the rotating ring (7) close to the adjacent fixed ring (4), and the pressing ring (8) is pressed and matched with the adjacent fixed ring (4).

3. The drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering according to claim 2 is characterized by: The contact points between the extrusion ring (8) and the adjacent fixing ring (4) are both spherical surfaces, and the center of the spherical surface of the extrusion ring (8) and the center of the spherical surface of the adjacent fixing ring (4) both coincide with the center of the spherical surface of the adjacent spherical joint (3).

4. The drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering according to claim 3 is characterized by: The outer side surface of the extrusion ring (8) is circular, and the inner side of the extrusion ring (8) is a waist-shaped hole. The transmission shaft (5) slides in the waist-shaped hole of the adjacent extrusion ring (8). The radius of the transmission shaft (5) is smaller than the radius of the waist-shaped hole on the adjacent extrusion ring (8), and the difference between the two is less than 1 mm.

5. The drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering according to claim 3 is characterized by: A micro motor (9) is fixedly connected inside the spherical joint (3), tooth grooves evenly distributed in the circumferential direction are provided inside the rotating ring (7), and the output shaft of the micro motor (9) is fixedly connected to a gear meshing with the tooth grooves evenly distributed in the circumferential direction on the adjacent rotating ring (7).

6. The drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering according to claim 5 is characterized by: The width of the tooth groove inside the rotating ring (7) is greater than the width of the gear on the output shaft of the adjacent micro motor (9), and the preload force between the rotating ring (7) and the adjacent spherical joint (3) is greater than the preload force between the connecting tube (2) and the spherical joint (3) adjacent to and away from the drill bit (1).

7. The drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering according to claim 6 is characterized by: The connecting cylinder (2) is fixedly connected with uniformly distributed first electric rotating shafts (13), the first electric rotating shafts (13) are coaxial with the adjacent first threaded rods (12), and the first electric rotating shafts (13) are connected with the adjacent first threaded rods (12) via splines.

8. The drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering according to claim 7 is characterized by: The invention also comprises a fixing mechanism for fixing the adjacent spherical joints (3) and being evenly distributed. The fixing mechanism is arranged on a side of the adjacent connecting tube (2) close to the adjacent fixing ring (4). The fixing mechanism comprises a second electric rotating shaft (14). The second electric rotating shaft (14) is installed on a side of the adjacent connecting tube (2) close to the adjacent fixing ring (4). The side of the connecting tube (2) close to the adjacent second electric rotating shaft (14) is rotatably connected to a second threaded rod (15). The second threaded rod (15) is spline-connected to the adjacent second electric rotating shaft (14). The second threaded rod (15) is threadedly connected to a second sliding tube (16). The second sliding tube (16) is fixedly connected to a sliding A ring (17) is fixedly connected with a circumferentially uniformly distributed extrusion block (18); a side of the connecting tube (2) away from the drill bit (1) is slidably connected with a circumferentially uniformly distributed first limit block (19); the first limit block (19) is limitedly matched with the adjacent spherical joint (3); the first limit block (19) is slidably connected with a second limit block (20); the second limit block (20) is extruded and matched with the adjacent extrusion block (18); the spherical joint (3) is slidably connected with a circumferentially uniformly distributed extrusion plate (21); a spring is fixedly connected between the extrusion plate (21) and the adjacent spherical joint (3); the extrusion plate (21) is extruded and matched with the adjacent first limit block (19).

9. The drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering according to claim 8 is characterized by: The extrusion block (18) is provided with an inclined surface, the angle between the inclined surface of the extrusion block (18) and the axial direction of the adjacent connecting tube (2) is less than 30 degrees, and the extrusion block (18) is extruded and matched with the adjacent second limiting block (20) through its inclined surface.

10. The drilling trajectory maintaining device for a flexible drilling tool for prospecting engineering according to claim 9, characterized in that: The first limit block (19) is slidably connected to symmetrically distributed sliding blocks (22), tension springs are fixedly connected between the symmetrically distributed sliding blocks (22), the symmetrically distributed sliding blocks (22) are all pressed and matched with the adjacent second limit blocks (20), and the sliding blocks (22) are pressed and matched with the adjacent spherical joints (3).

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