Downhole screw drilling tool capable of adaptively adjusting direction of centralizing strip

Abstract

The invention relates to the technical field of screw drilling tools, in particular to an underground screw drilling tool capable of adaptively adjusting the orientation of a centralizing strip, the outer side of a transmission shaft shell is rotationally sleeved with a centralizer, a sliding hole is formed in the position, corresponding to the centralizing strip, of the lower end of the centralizer, and a reversing spring bolt is slidably arranged in the sliding hole; the hole bottom of the sliding hole is provided with a pop-up piece used for controlling the shifting block to move downwards, the hole wall of the sliding hole is provided with a trigger hole communicated with the surface of the centralizing strip, the surface of the centralizing strip is provided with a wear-resisting layer, and a trigger and an elastic piece are movably arranged in the trigger hole. The elastic piece is used for pushing the trigger to be separated from the surface of the reversing spring bolt after the abrasion-resistant layer is abraded. A shifting block is arranged on the outer wall of the transmission shaft and located below the reversing spring bolt and used for driving the centralizer to rotate, and a second ejector block used for driving the reversing spring bolt to retract into the sliding hole is arranged on the surface of the transmission shaft shell and located below the centralizer. The problem that a centralizer centralizing strip of a screw drill does not have self-adaptive adjusting capacity underground is solved.

Description

Technical Field

[0001] The invention relates to the technical field of screw drill tools, and in particular to a screw drill tool capable of adaptively adjusting the orientation of a straightening bar in a well. Background Art

[0002] The screw drill is mainly composed of five parts: the transmission shaft assembly, the universal shaft assembly, the bent housing assembly, the motor assembly and the anti-drop assembly. Different drilling tool combinations are required according to different drilling conditions, and some screw drills need to be equipped with a centralizer. The centralizer of the screw drill is generally located on the outer shell of the transmission shaft assembly. Centralizers of different structures and sizes will be selected according to the size of the wellbore.

[0003] The centralizer of the screw drill is divided into an integrated centralizer and a replaceable centralizer, in which the replaceable centralizer is connected to the drive shaft assembly by a thread. The centralizer bar is a key component of the centralizer, which has the functions of controlling the wellbore trajectory, expanding the hole and trimming the wellbore wall. By adjusting the position and size of the centralizer, the drill tool structure can be changed, and its performance of increasing, stabilizing and decreasing the inclination can be changed, thereby reducing the sliding directional drilling footage and using drilling parameters that are more conducive to saving time. The centralizer bar is classified according to different wear-resistant layers, mainly divided into wear-resistant cladding layers, carbide wear-resistant blocks and heat-stable polycrystalline wear-resistant blocks. Regardless of the wear resistance of the centralizer bar, it will be worn eccentrically due to contact with the wellbore wall during use, which will affect the control of the wellbore trajectory and lead to the replacement of the screw drill.

[0004] However, the existing centralizer structure, whether it is an integrated centralizer or a replaceable centralizer, can only be returned to the factory for disassembly, repair or replacement once eccentric wear occurs.

[0005] The existing screw drill transmission shaft assembly centralizers have obvious deficiencies, which are mainly manifested as follows: 1. The centralizer's centralizing bar has no adaptive adjustment capability underground; 2. The wear resistance of the centralizer has a short board effect compared to the service life of the screw drill itself, which will affect the drilling cycle and efficiency. In the actual use of the centralizer, since the curved shell assembly has a certain curvature, the centralizer installed on the drive shaft assembly corresponds to the outermost centralizer strip of the curved shell assembly during use. The wear-resistant layer on the centralizer strip will be worn out first. Although the centralizer strip without the wear-resistant layer can also work normally, if the wear-resistant layer is not repaired or replaced after wear, the centralizer strip without the wear-resistant layer will wear out quickly, causing the entire centralizer to lose its function. Summary of the invention

[0006] The purpose of the present invention is to provide a screw drill with an adaptively adjustable position of a stabilizing bar in the well, so as to solve the problem in the prior art that the stabilizing bar of the screw drill has no adaptive adjustment capability in the well.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A screw drill tool capable of adaptively adjusting the position of a straightening bar in a well comprises an anti-drop assembly, a motor assembly, a bent housing assembly, a universal shaft assembly and a transmission shaft assembly which are sequentially arranged from top to bottom. The transmission shaft assembly comprises a transmission shaft housing and a transmission shaft rotatably arranged in the transmission shaft housing. A straightening device is rotatably sleeved on the outer side of the transmission shaft housing. A plurality of straightening bars are vertically arranged around the outer side of the straightening device. A sliding hole is arranged at the lower end of the straightening device at a position corresponding to the straightening bar. A reversing locking tongue is slidably arranged in the sliding hole. A pop-up member for controlling the downward movement of a toggle block is arranged at the bottom of the sliding hole. The hole wall of the sliding hole is provided with and A trigger hole is connected to the surface of the straightening bar, and a wear-resistant layer is provided on the surface of the straightening bar, which blocks the trigger hole. A trigger and an elastic member are movably provided in the trigger hole, and the outer end of the trigger abuts against the inner side of the wear-resistant layer, and the other end is clamped with the surface of the reversing lock tongue. The elastic member is used to push the trigger to separate from the surface of the reversing lock tongue after the wear-resistant layer is completely worn out; a toggle block is provided on the outer wall of the transmission shaft below the reversing lock tongue, and the lower end of the reversing lock tongue contacts the toggle block when it moves downward, so as to drive the straightener to rotate, and a second top block for driving the reversing lock tongue to retract to the sliding hole is provided on the surface of the transmission shaft housing below the straightener.

[0008] A further technical solution is that the pop-up part includes a telescopic rod and a first spring, an elastic hole is recessed in the bottom of the sliding hole, one end of the telescopic rod is connected to the bottom of the elastic hole, and the other end is connected to the upper end of the reversing lock tongue, the first spring is sleeved on the outer wall of the telescopic rod, and the upper end of the first spring is connected to the bottom of the elastic hole, and the lower end is connected to the upper end of the reversing lock tongue.

[0009] A further technical solution is that the elastic member is a second spring, a limiting nut is provided on the inner wall of the inner end of the trigger hole, a limiting ring is provided on the outer wall of the trigger on the outside of the limiting nut, the second spring is sleeved on the outer wall of the trigger between the limiting ring and the limiting nut, and the two ends of the second spring are respectively connected to the limiting ring and the limiting nut; the reversing lock tongue is provided with a clamping hole at the position aligned with the trigger hole, and the inner end of the trigger is clamped in the clamping hole through the limiting nut; one end of the trigger that fits the wear-resistant layer is set to a wear-prone material.

[0010] A further technical solution is that the lower end of the reversing lock tongue is connected with a driving block below the sliding hole, and a rotating groove is arranged in a side depression surrounding the lower end of the transmission shaft housing, the lower groove wall of the rotating groove is connected to the lower end of the transmission shaft housing, and a first top block is arranged on the inner side protrusion of the driving block, the inner side of the first top block is slidably fitted with the groove bottom of the rotating groove, the side of the first top block facing the rotation direction of the stabilizer is arranged as a first arc surface, the first arc surface gradually inclines along the rotation direction of the stabilizer from bottom to top, the second top block protrudes and is arranged at the groove bottom of the rotating groove, the spacing between the second top block and the upper groove wall of the rotating groove is greater than the height of the first top block, and the side of the second top block facing away from the rotation direction of the stabilizer is arranged as a second arc surface slidably fitted with the first arc surface; the hole wall of the sliding hole is provided with a first accommodating hole and a second accommodating hole at intervals below the trigger hole, and the reversing A locking hole is provided on the surface of the lock tongue, and a locking column is provided in the first accommodating hole. The locking column is connected to the bottom of the first accommodating hole by a third spring, and a nylon ball is provided in the locking hole, and the nylon ball is connected to the bottom of the locking hole by a fourth spring; when the inner end of the trigger is clamped in the clamping hole, the first accommodating hole and the locking hole are aligned, and the locking column and the nylon ball are in contact and fit, so that the nylon ball is placed in the locking hole, and the locking column is placed in the first accommodating hole; after the reversing lock tongue is moved downward, the second accommodating hole and the locking hole are aligned, and the fourth spring pushes the nylon ball into the second accommodating hole, and the depth of the second accommodating hole is the same as the diameter of the nylon ball; after the first top block and the second top block cooperate to push the reversing lock tongue to move upward, the first accommodating hole and the locking hole are aligned again, and the third spring pushes the inner end of the locking column to enter the locking hole.

[0011] A further technical solution is that a bearing movable sleeve is provided on the outer wall of the transmission shaft near the lower end, and the shifting block is arranged on the bearing movable sleeve.

[0012] A further technical solution is that a stopper is provided at the bottom of the rotating groove on the side of the reversing lock tongue at the outermost position of the corresponding bent shell assembly toward the rotation direction of the stabilizer, and the stopper is arranged in contact with the upper groove wall of the rotating groove, the height of the stopper is smaller than the spacing between the first accommodating hole and the second accommodating hole, and the thickness of the stopper is lower than the depth of the rotating groove.

[0013] A further technical solution is that a cross roller bearing is installed on the upper side of the centralizer of the transmission shaft housing, the inner ring of the cross roller bearing is connected to the outer wall of the transmission shaft housing, and the upper end of the centralizer is fixedly connected to the outer ring of the cross roller bearing by fixing bolts.

[0014] A further technical solution is that a cross roller bearing is installed at the connection between the transmission shaft housing and the bent housing assembly, a ratchet is arranged around the upper side of the outer ring of the cross roller bearing, a ratchet is arranged around the upper side of the ratchet, and a pawl matching the ratchet is arranged at the lower end of the bent housing assembly, and the pawl is used to limit the one-way rotation of the ratchet.

[0015] A further technical solution is that a stop ring is provided at the lower end of the surround bending shell assembly, a pawl is provided on the lower side of the stop ring, a telescopic groove is provided in the recessed portion of the surround bending shell assembly, an adjustment ring is provided at the upper end of the surround stopping ring, the adjustment ring is slid up and down in the telescopic groove, a fifth spring is installed in the telescopic groove, the upper end of the fifth spring is connected to the bottom of the telescopic groove, and the lower end is connected to the upper side of the stop ring; a limiting slide groove is provided at the lower end of the bending shell assembly, a limiting block matching the limiting slide groove is provided at the upper end of the stop ring, and the limiting block is slid up and down in the limiting slide groove.

[0016] A further technical solution is that the inner wall of the transmission shaft housing is rotatably connected to the outer wall of the transmission shaft through a composite sheet bearing.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Before the wear-resistant layer on the straightening strip is worn away, the wear-resistant layer is used to support the trigger, so that the inner end of the trigger is engaged with the surface of the reversing lock tongue, thereby fixing the reversing lock tongue. At this time, the toggle block always moves with the transmission shaft, but the toggle block is located at the lower end of the reversing lock tongue and is in contact, so that the straightening device cannot be driven to rotate. When the wear-resistant layer is worn away, the outer end of the commutator loses the obstruction of the wear-resistant layer. Under the push of the elastic member, the outer end of the trigger passes through the trigger hole, so that the inner end of the trigger is separated from the surface of the reversing lock tongue. At this time, the reversing lock tongue is pushed downward by the pop-up member until the lower end of the reversing lock tongue contacts the toggle block, so that the commutator is rotated under the push of the toggle block, so that the straightening strip with the worn-away wear-resistant layer moves away from the original direction, that is, moves away from the outermost position of the corresponding bent shell assembly, and the straightening strip without the worn-away wear-resistant layer moves to this position. After rotating into place, the lower end of the reversing lock tongue is supported by the second top block, and the reversing lock tongue is retracted into the sliding hole with the help of the second top block, so that the toggle block is separated from the reversing lock tongue, and the commutator cannot be driven to rotate. And when the wear-resistant layer on the straightening bar at the outermost position of the bent shell assembly is worn out, the above movement will be automatically repeated to rotate the next straightening bar to this position, thereby realizing automatic adjustment of the straightening bar. The present invention allows the straightening bar of the stabilizer to have downhole adaptive ability and realize automatic reversing after eccentric wear of the straightening bar. Improve the service life of the entire screw, solve the short board effect of the barrel caused by eccentric wear of the straightening bar, and improve drilling efficiency; 2. Greatly improve the drilling efficiency of the screw drilling tool and the utilization rate of the wear-resistant material of the straightening bar of the stabilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall schematic diagram of a screw drill tool capable of adaptively adjusting the position of a straightening bar in a well according to the present invention.

[0019] Figure 2 The present invention is a schematic diagram of a transmission shaft assembly of a screw drill capable of adaptively adjusting the position of a straightening bar in a well.

[0020] Figure 3 The present invention is a schematic diagram of a transmission shaft housing and a rotating groove of a screw drill tool capable of adaptively adjusting the orientation of a straightening bar in a well.

[0021] Figure 4 The present invention is a schematic diagram of a reversing locking tongue of a screw drill tool capable of adaptively adjusting the orientation of a straightening bar in a well.

[0022] Figure 5 The present invention is a cross-sectional schematic diagram of a transmission shaft assembly of a screw drill tool capable of adaptively adjusting the orientation of a straightening bar in a well.

[0023] Figure 6 for Figure 5 A partial enlargement of the mark A in the middle Figure 1 .

[0024] Figure 7 for Figure 5 A partial enlargement of the mark A in the middle Figure 2 .

[0025] Figure 8 for Figure 5 A partial enlargement of the mark A in the middle Figure 3 .

[0026] Fig. 9 for Figure 5 A partial enlarged schematic diagram of the area marked B in the middle.

[0027] Icons: 1-anti-drop assembly, 2-motor assembly, 3-bend housing assembly, 4-universal shaft assembly, 5-drive shaft assembly, 6-drive shaft housing, 7-drive shaft, 8-centralizer, 9-centralizer bar, 10-sliding hole, 11-reversing lock tongue, 12-trigger hole, 13-wear-resistant layer, 14-trigger, 15-sliding block, 16-second top block, 17-telescopic rod, 18-first spring, 19-elastic hole, 20-second spring, 21-limiting nut, 22-limiting ring, 23-card hole, 24-drive block, 25 -rotation groove, 26-first top block, 27-first arc surface, 28-second arc surface, 29-first accommodating hole, 30-second accommodating hole, 31-locking hole, 32-locking column, 33-third spring, 34-nylon ball, 35-fourth spring, 36-bearing sleeve, 37-stopper, 38-cross roller bearing, 39-fixing bolt, 40-ratchet, 41-ratchet, 42-pawl, 43-stop ring, 44-telescopic groove, 45-adjusting ring, 46-fifth spring, 47-composite sheet bearing, 48-limiting block. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] Figures 1 to 9 The upper end of the embodiment is Figure 1 , Figure 2 , Figure 3 , Figure 5 The right end shown in the figure, and the lower end is the left end in the above figure.

[0030] Embodiment 1: A screw drill tool capable of adaptively adjusting the position of a straightening bar in a well, comprising an anti-drop assembly 1, a motor assembly 2, a bent housing assembly 3, a universal shaft assembly 4 and a transmission shaft assembly 5 which are arranged in sequence from top to bottom, the transmission shaft assembly 5 comprising a transmission shaft housing 6 and a transmission shaft 7 rotatably arranged in the transmission shaft housing 6, a straightening device 8 is rotatably sleeved on the outer side of the transmission shaft housing 6, a plurality of straightening bars 9 are vertically arranged around the outer side of the straightening device 8, a sliding hole 10 is arranged at the lower end of the straightening device 8 at a position corresponding to the straightening bar 9, a reversing lock tongue 11 is slidably arranged in the sliding hole 10, a pop-up member for controlling the downward movement of a toggle block 15 is arranged at the bottom of the sliding hole 10, and a hole wall of the sliding hole 10 is provided with a straightening device 8 connected to the surface of the straightening bar 9 A trigger hole 12 is formed through the straightening strip 9, and a wear-resistant layer 13 is provided on the surface of the straightening strip 9. The wear-resistant layer 13 blocks the trigger hole 12. A trigger 14 and an elastic member are movably provided in the trigger hole 12. The outer end of the trigger 14 abuts against the inner side of the wear-resistant layer 13, and the other end is clamped with the surface of the reversing lock tongue 11. The elastic member is used to push the trigger 14 to separate from the surface of the reversing lock tongue 11 after the wear-resistant layer 13 is completely worn out; a toggle block 15 is provided on the outer wall of the transmission shaft 7 below the reversing lock tongue 11, and the lower end of the reversing lock tongue 11 contacts the toggle block 15 when it moves downward, so as to drive the straightening device 8 to rotate, and a second top block 16 for driving the reversing lock tongue 11 to retract to the sliding hole 10 is provided on the surface of the transmission shaft housing 6 below the straightening device 8. Before the wear-resistant layer 13 on the straightening bar 9 is worn away, the wear-resistant layer 13 is used to support the trigger 14, so that the inner end of the trigger 14 is engaged with the surface of the reversing lock tongue 11, thereby fixing the reversing lock tongue 11. At this time, the toggle block 15 always moves with the transmission shaft 7, but the toggle block 15 is located at the lower end of the reversing lock tongue 11 and is in contact with it, so it cannot drive the straightening device 8 to rotate. When the wear-resistant layer 13 is worn away, the outer end of the centralizer 8 loses the obstruction of the wear-resistant layer 13. Under the push of the elastic member, the outer end of the trigger 14 passes through the trigger hole 12, so that the inner end of the trigger 14 is separated from the surface of the reversing lock tongue 11. At this time, the reversing lock tongue 11 is pushed downward by the pop-up member until the lower end of the reversing lock tongue 11 contacts the toggle block 15. Thus, under the push of the toggle block 15, the centralizer 8 is rotated, so that the centralizer bar 9 with the wear-resistant layer 13 worn away moves away from the original direction, that is, moves away from the outermost position of the corresponding bent shell assembly 3, while the centralizer bar 9 without the wear-resistant layer 13 is moved to this position. After rotating in place, the lower end of the reversing lock tongue 11 contacts the second top block 16, and the reversing lock tongue 11 is retracted back to the sliding hole 10 with the help of the second top block 16, so that the toggle block 15 is separated from the reversing lock tongue 11, and thus the centralizer 8 cannot be driven to rotate. And when the wear-resistant layer 13 on the straightening bar 9 at the outermost position of the bent shell assembly 3 is completely worn, the above movement will be automatically repeated to rotate the next straightening bar 9 to this position, thereby realizing automatic adjustment of the straightening bar 9. The present invention allows the straightening bar 9 of the straightening device 8 to have downhole self-adaptive ability, thereby realizing automatic reversal of the straightening bar 9 after eccentric wear.The service life of the entire screw drill is increased, the short board effect of the barrel caused by the eccentric wear of the straightening bar 9 is solved, and the drilling efficiency is improved. The drilling efficiency of the screw drill and the utilization rate of the wear-resistant material of the straightening bar 9 are greatly improved.

[0031] The pop-up member includes a telescopic rod 17 and a first spring 18. The bottom of the sliding hole 10 is recessed with an elastic hole 19. One end of the telescopic rod 17 is connected to the bottom of the elastic hole 19, and the other end is connected to the upper end of the reversing lock tongue 11. The first spring 18 is sleeved on the outer wall of the telescopic rod 17, and the upper end of the first spring 18 is connected to the bottom of the elastic hole 19, and the lower end is connected to the upper end of the reversing lock tongue 11. By providing the first spring 18, when the trigger 14 is separated from the reversing lock tongue 11, the reversing lock tongue 11 is pushed downward and moved quickly by the elastic force of the first spring 18. By providing the telescopic rod 17, the first spring 18 can be supported to prevent the first spring 18 from bending during compression and extension, which causes the reversing lock tongue 11 to be unable to pop out quickly and smoothly.

[0032] The elastic member is a second spring 20, a limiting nut 21 is provided on the inner wall of the inner end of the trigger hole 12, a limiting ring 22 is provided on the outer side of the limiting nut 21 on the outer wall of the trigger 14, the second spring 20 is sleeved on the outer wall of the trigger 14 between the limiting ring 22 and the limiting nut 21, and the two ends of the second spring 20 are respectively connected with the limiting ring 22 and the limiting nut 21; the reversing lock tongue 11 is provided with a clamping hole 23 at a position aligned with the trigger hole 12, and the inner end of the trigger 14 passes through the limiting nut 21 and is clamped in the clamping hole 23; one end of the trigger 14 that is in contact with the wear-resistant layer 13 is set to be a wear-resistant material. Through the clamping hole 23, when the wear-resistant layer 13 is not worn off, the reversing lock tongue 11 can be fixed in the sliding hole 10 with the help of the clamping hole 23 and the trigger 14. The easily-worn material is plastic, low-density metal, or other materials that can be worn away in a short time, so that when the second spring 20 pushes the trigger 14 to move outside the trigger hole 12, the easily-worn material can be quickly worn away to achieve the inner end of the trigger 14 to be quickly separated from the reversing lock tongue 11. After the wear-resistant layer 13 is worn, the second spring 20 pushes the trigger 14 to move toward the outer end of the trigger hole 12 to make the outer end of the trigger 14 contact and rub against the wall of the wellbore, thereby quickly consuming the easily-worn material and separating the trigger 14 from the clamping hole 23.

[0033] The lower end of the reversing lock tongue 11 is connected to a driving block 24 below the sliding hole 10, and a rotating groove 25 is provided in the side depression around the lower end of the transmission shaft housing 6. The lower groove wall of the rotating groove 25 is connected to the lower end of the transmission shaft housing 6. The inner side protrusion of the driving block 24 is provided with a first top block 26. The inner side of the first top block 26 is slidably fitted with the groove bottom of the rotating groove 25. The side of the first top block 26 facing the rotation direction of the centralizer 8 is provided with a first arc surface 27. The first arc surface 27 gradually follows the rotation direction from bottom to top. The rotation direction of the centralizer 8 is inclined, the second top block 16 is convexly arranged at the bottom of the rotation groove 25, the distance between the second top block 16 and the upper groove wall of the rotation groove 25 is greater than the height of the first top block 26, and the side of the second top block 16 facing away from the rotation direction of the centralizer 8 is arranged as a second arc surface 28 that slides and fits with the first arc surface 27; the hole wall of the sliding hole 10 is provided with a first accommodating hole 29 and a second accommodating hole 30 at intervals below the trigger hole 12, and the surface of the reversing lock tongue 11 is provided with a locking hole 31, the first A locking column 32 is provided in the first receiving hole 29, and the locking column 32 is connected to the bottom of the first receiving hole 29 by a third spring 33. A nylon ball 34 is provided in the locking hole 31, and the nylon ball 34 is connected to the bottom of the locking hole 31 by a fourth spring 35. When the inner end of the trigger 14 is clamped in the clamping hole 23, the first receiving hole 29 and the locking hole 31 are aligned, and the locking column 32 and the nylon ball 34 are in contact with each other, so that the nylon ball 34 is placed in the locking hole 31, and the locking column 32 The first receiving hole 29 is placed in the first receiving hole 29; after the reversing lock tongue 11 moves downward, the second receiving hole 30 and the locking hole 31 are aligned, and the fourth spring 35 pushes the nylon ball 34 into the second receiving hole 30. The depth of the second receiving hole 30 is the same as the diameter of the nylon ball 34; after the first top block 26 and the second top block 16 cooperate to push the reversing lock tongue 11 to move upward, the first receiving hole 29 and the locking hole 31 are aligned again, and the third spring 33 pushes the inner end of the locking column 32 into the locking hole 31. Such a setting, such as Figure 6 As shown, when the wear-resistant layer 13 is not worn away, the inner end of the trigger 14 is inserted into the clamping hole 23 to fix the reversing lock tongue 11. At this time, the first receiving hole 29 and the locking hole 31 are aligned, and the locking column 32 and the nylon ball 34 are in contact with each other. By selecting the third spring 33 and the fourth spring 35 with different elastic forces, the nylon ball 34 and the locking column 32 are in a balanced state. The nylon ball 34 is placed in the locking hole 31, and the locking column 32 is placed in the first receiving hole 29. Figure 7As shown, after the friction wears off, the trigger 14 gradually separates from the locking hole 23. When the trigger 14 moves away from the locking hole 23, the reversing lock tongue 11 is quickly pushed downward by the thrust of the first spring 18, so that the lower end of the reversing lock tongue 11 can contact the toggle block 15. At this time, the locking hole 31 moves downward with the reversing lock tongue 11, from being aligned with the first accommodating hole 29 to being aligned with the second accommodating hole 30, and the nylon ball 34 is pushed into the second accommodating hole 30 by the fourth spring 35. When the toggle block 15 moves to the position of the reversing lock tongue 11 that pops out, the centralizer 8 is rotated under the drive of the toggle block 15. When the reversing lock tongue 11 that pops out moves to the position of the second top block 16, the reversing lock tongue 11 is pushed upward by the contact between the first arc surface 27 and the second arc surface 28, and retracted into the sliding hole 10 again, as shown in FIG. Figure 8 As shown, at this time, the locking hole 31 of the reversing lock tongue 11 moves from the position aligned with the second receiving hole 30 to the position aligned with the first receiving hole 29, so that the locking column 32 in the first receiving hole 29 enters the locking hole 31 under the push of the third spring 33 and compresses the fourth spring 35. At this time, the reversing lock tongue 11 is re-locked in the sliding hole 10. For example, when there are five straightening bars 9 distributed on the surface of a straightener 8, it pops out from the reversing lock tongue 11, contacts the second top block 16 under the push of the toggle block 15, and retracts into the sliding hole 10. In this process, the straightener 8 rotates 72 degrees, that is, the angle of one-fifth of a circle. And each subsequent reversing lock tongue 11 rotates this angle after it pops out until all five straightening bars 9 rotate to this position to work.

[0034] The outer wall of the transmission shaft 7 near the lower end is sleeved with a bearing sleeve 36, and the toggle block 15 is arranged on the bearing sleeve 36. The bearing sleeve 36 serves as a friction member between the transmission shaft housing 6 and the transmission shaft 7 to avoid direct friction contact between the transmission shaft 7 and the transmission shaft housing 6.

[0035] A stopper 37 is provided at the bottom of the rotation groove 25 on the side of the reversing lock tongue 11 at the outermost position of the curved shell assembly 3 facing the rotation direction of the centralizer 8. The stopper 37 is arranged in contact with the upper groove wall of the rotation groove 25. The height of the stopper 37 is less than the spacing between the first receiving hole 29 and the second receiving hole 30, and the thickness of the stopper 37 is less than the depth of the rotation groove 25. By providing the stopper 37, when the centralizer 8 is working, the part of the reversing lock tongue 11 protruding from the sliding hole 10, that is, the first top block 26 is in contact with the stopper 37, so that the centralizer 8 is restricted from rotating in the same direction as the transmission shaft 7 when working. When the reversing lock tongue 11 pops out, the first top block 26 moves downward to bypass the stopper 37 and then drives the centralizer 8 to rotate under the drive of the toggle block 15.

[0036] Embodiment 2: On the basis of Example 1, the transmission shaft housing 6 is provided with a cross roller bearing 38 on the upper side of the centralizer 8, the inner ring of the cross roller bearing 38 is connected to the outer wall of the transmission shaft housing 6, and the upper end of the centralizer 8 is fixedly connected to the outer ring of the cross roller bearing 38 by a fixing bolt 39. By providing the cross roller bearing 38, the centralizer 8 can smoothly rotate on the surface of the transmission shaft housing 6, and the centralizer 8 can work stably.

[0037] The cross roller bearing 38 is installed at the connection between the transmission shaft housing 6 and the bent housing assembly 3. A ratchet 40 is arranged around the upper side of the outer ring of the cross roller bearing 38, and a ratchet 41 is arranged around the upper side of the ratchet 40. A pawl 42 matching the ratchet 41 is arranged at the lower end of the bent housing assembly 3. The pawl 42 is used to limit the unidirectional rotation of the ratchet 40. The ratchet 40 and the pawl 42 cooperate to limit the rotation direction of the centralizer 8, so as to prevent the centralizer 8 from rotating in the opposite direction to the transmission shaft 7.

[0038] A stop ring 43 is provided at the lower end of the surrounding bending shell assembly 3, and a pawl 42 is provided on the lower side of the stop ring 43. A telescopic groove 44 is recessed at the lower end of the surrounding bending shell assembly 3, and an adjusting ring 45 is provided at the upper end of the surrounding stopping ring 43. The adjusting ring 45 is slidably arranged in the telescopic groove 44 up and down, and a fifth spring 46 is installed in the telescopic groove 44. The upper end of the fifth spring 46 is connected to the bottom of the telescopic groove 44 by contact, and the lower end is connected to the upper side of the stop ring 43 by contact; a limiting slide groove is provided at the lower end of the bending shell assembly 3, and a limiting block 48 matching the limiting slide groove is provided at the upper end of the stopping ring 43, and the limiting block 48 is slidably arranged in the limiting slide groove up and down. When the centralizer 8 rotates, the ratchet 41 on the ratchet 40 rotates with the ratchet 40, thereby pushing the pawl 42 engaged with the ratchet 41 to move upward, thereby pushing the stop ring 43 to move upward, and the stop ring 43 drives the adjustment ring 45 to compress the fifth spring 46 during the upward movement. Every time the ratchet 41 and the pawl 42 move a tooth gap distance, the fifth spring 46 will push the stop ring 43 to move downward to engage the ratchet 41 and the pawl 42. With the cooperation of the limiting slide groove and the limiting block 48, the stop ring 43 can be limited to rotate, thereby limiting the rotation of the centralizer 8 with the help of the stop ring 43.

[0039] The inner wall of the transmission shaft housing 6 is rotatably connected to the outer wall of the transmission shaft 7 via a composite sheet bearing 47 .

[0040] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A downhole screw drill capable of adaptively adjusting the orientation of a straightening bar, comprising an anti-drop assembly (1), a motor assembly (2), a bent housing assembly (3), a universal shaft assembly (4) and a transmission shaft assembly (5) arranged in sequence from top to bottom, wherein the transmission shaft assembly (5) comprises a transmission shaft housing (6) and a transmission shaft (7) rotatably arranged in the transmission shaft housing (6), characterized in that: The outer rotating sleeve of the transmission shaft housing (6) is provided with a centralizer (8), and a plurality of centralizer bars (9) are vertically arranged around the outer side of the centralizer (8). The lower end of the centralizer (8) is provided with a sliding hole (10) at a position corresponding to the centralizer bar (9), and a reversing lock tongue (11) is slidably arranged in the sliding hole (10). A pop-up member for controlling the downward movement of a toggle block (15) is provided at the bottom of the sliding hole (10). A trigger hole (12) connected to the surface of the centralizer bar (9) is provided on the wall of the sliding hole (10), and a wear-resistant layer (13) is provided on the surface of the centralizer bar (9). The wear-resistant layer (13) blocks the trigger hole (12), and a movable member in the trigger hole (12) is provided. A trigger (14) and an elastic member are provided, wherein the outer end of the trigger (14) abuts against the inner side of the wear-resistant layer (13), and the other end is clamped with the surface of the reversing lock tongue (11), and the elastic member is used to push the trigger (14) to separate from the surface of the reversing lock tongue (11) after the wear-resistant layer (13) is completely worn; an outer wall of the transmission shaft (7) is provided with a toggle block (15) below the reversing lock tongue (11), and the lower end of the reversing lock tongue (11) contacts the toggle block (15) when moving downward, so as to drive the centralizer (8) to rotate; and a second top block (16) is provided on the surface of the transmission shaft housing (6) below the centralizer (8) for driving the reversing lock tongue (11) to retract to the sliding hole (10).

2. The downhole screw drilling tool capable of adaptively adjusting the position of the straightening bar according to claim 1, characterized in that: The pop-up member comprises a telescopic rod (17) and a first spring (18); the bottom of the sliding hole (10) is recessed to form an elastic hole (19); one end of the telescopic rod (17) is connected to the bottom of the elastic hole (19), and the other end is connected to the upper end of the reversing lock tongue (11); the first spring (18) is sleeved on the outer wall of the telescopic rod (17), and the upper end of the first spring (18) is connected to the bottom of the elastic hole (19), and the lower end is connected to the upper end of the reversing lock tongue (11).

3. The downhole screw drilling tool capable of adaptively adjusting the position of the straightening bar according to claim 1, characterized in that: The elastic member is a second spring (20); a limiting nut (21) is arranged on the inner wall of the inner end of the trigger hole (12); a limiting ring (22) is arranged on the outer side of the limiting nut (21) on the outer wall of the trigger (14); the second spring (20) is sleeved on the outer wall of the trigger (14) between the limiting ring (22) and the limiting nut (21); and the two ends of the second spring (20) are respectively connected to the limiting ring (22) and the limiting nut (21); the reversing lock tongue (11) is provided with a clamping hole (23) at a position aligned with the trigger hole (12); the inner end of the trigger (14) passes through the limiting nut (21) and is clamped in the clamping hole (23); and one end of the trigger (14) that contacts the wear-resistant layer (13) is provided with an easily-worn material.

4. The downhole screw drilling tool capable of adaptively adjusting the position of the straightening bar according to claim 3, characterized in that: The lower end of the reversing lock tongue (11) is connected to a driving block (24) below the sliding hole (10); a rotation groove (25) is provided in a side depression surrounding the lower end of the transmission shaft housing (6); a lower groove wall of the rotation groove (25) is communicated with the lower end of the transmission shaft housing (6); a first top block (26) is provided on the inner side protrusion of the driving block (24); the inner side of the first top block (26) is slidably fitted with the groove bottom of the rotation groove (25); a side of the first top block (26) facing the rotation direction of the centralizer (8) is provided with a first arc surface (27); the first arc surface (27) gradually extends from bottom to top along the rotation direction of the centralizer (8); The second top block (16) is convexly arranged at the bottom of the rotating groove (25), the distance between the second top block (16) and the upper groove wall of the rotating groove (25) is greater than the height of the first top block (26), and the side of the second top block (16) facing away from the rotating direction of the centralizer (8) is arranged as a second arc surface (28) that is slidably fitted with the first arc surface (27); the hole wall of the sliding hole (10) is provided with a first receiving hole (29) and a second receiving hole (30) at intervals below the trigger hole (12), the surface of the reversing lock tongue (11) is provided with a locking hole (31), the first receiving hole (29) A locking column (32) is arranged inside the first receiving hole (29), and the locking column (32) is connected to the bottom of the first receiving hole (29) by a third spring (33). A nylon ball (34) is arranged inside the locking hole (31), and the nylon ball (34) is connected to the bottom of the locking hole (31) by a fourth spring (35). When the inner end of the trigger (14) is locked in the locking hole (23), the first receiving hole (29) and the locking hole (31) are aligned, and the locking column (32) and the nylon ball (34) are in contact with each other, so that the nylon ball (34) is placed in the locking hole (31) and the locking column (32) is placed in the first receiving hole (31). The first receiving hole (29) is arranged in a receiving hole (29); after the reversing locking tongue (11) is moved downward, the second receiving hole (30) and the locking hole (31) are aligned, and the fourth spring (35) pushes the nylon ball (34) into the second receiving hole (30), and the depth of the second receiving hole (30) is the same as the diameter of the nylon ball (34); after the first top block (26) and the second top block (16) cooperate to push the reversing locking tongue (11) to move upward, the first receiving hole (29) and the locking hole (31) are aligned again, and the third spring (33) pushes the inner end of the locking column (32) into the locking hole (31).

5. The downhole screw drilling tool capable of adaptively adjusting the position of the straightening bar according to claim 1, characterized in that: A bearing movable sleeve (36) is sleeved on the outer wall of the transmission shaft (7) near the lower end, and the shifting block (15) is arranged on the bearing movable sleeve (36).

6. The downhole screw drilling tool capable of adaptively adjusting the position of the straightening bar according to claim 1, characterized in that: A stopper (37) is provided at the bottom of the rotation groove (25) on the side of the reversing lock tongue (11) at the outermost position of the corresponding bent shell assembly (3) facing the rotation direction of the centralizer (8), and the stopper (37) is arranged to fit the upper groove wall of the rotation groove (25), the height of the stopper (37) is less than the spacing between the first accommodating hole (29) and the second accommodating hole (30), and the thickness of the stopper (37) is less than the depth of the rotation groove (25).

7. The downhole screw drilling tool capable of adaptively adjusting the position of the straightening bar according to claim 1, characterized in that: The transmission shaft housing (6) is provided with a cross roller bearing (38) on the upper side of the centralizer (8); the inner ring of the cross roller bearing (38) is connected to the outer wall of the transmission shaft housing (6); and the upper end of the centralizer (8) is fixedly connected to the outer ring of the cross roller bearing (38) via a fixing bolt (39).

8. The downhole screw drilling tool capable of adaptively adjusting the position of the straightening bar according to claim 7, characterized in that: The cross roller bearing (38) is installed at the connection between the transmission shaft housing (6) and the bent housing assembly (3); a ratchet (40) is arranged around the upper side of the outer ring of the cross roller bearing (38); ratchet teeth (41) are arranged around the upper side of the ratchet (40); a pawl (42) matching the ratchet teeth (41) is arranged at the lower end of the bent housing assembly (3); the pawl (42) is used to limit the ratchet (40) from rotating in one direction.

9. The downhole screw drilling tool capable of adaptively adjusting the position of the straightening bar according to claim 8, characterized in that: A stop ring (43) is arranged around the lower end of the bent shell assembly (3), the pawl (42) is arranged on the lower side of the stop ring (43), a telescopic groove (44) is arranged in a recessed manner around the lower end of the bent shell assembly (3), an adjustment ring (45) is arranged around the upper end of the stop ring (43), the adjustment ring (45) is arranged in the telescopic groove (44) for sliding up and down, a fifth spring (46) is installed in the telescopic groove (44), the upper end of the fifth spring (46) is connected to the bottom of the telescopic groove (44) by contact, and the lower end is connected to the upper side of the stop ring (43) by contact; a limited sliding groove is arranged at the lower end of the bent shell assembly (3), a limit block (48) matching the limit sliding groove is arranged at the upper end of the stop ring (43), and the limit block (48) is arranged in the limit sliding groove for sliding up and down.

10. The downhole screw drilling tool capable of adaptively adjusting the position of the straightening bar according to claim 1, characterized in that: The inner wall of the transmission shaft housing (6) is rotatably connected to the outer wall of the transmission shaft (7) via a composite sheet bearing (47).

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