Composite abrasive material polishing tool for surface treatment of drill rod of ultra-deep well and use method of composite abrasive material polishing tool

Abstract

The invention relates to the technical field of drill rod surface composite abrasive polishing, and discloses a composite abrasive polishing tool for ultra-deep well drill rod surface treatment and a using method.The composite abrasive polishing tool comprises a platform, two bases are symmetrically and fixedly connected to the bottom end of the platform, and grooves are formed in the connecting positions of the outer sides of the two bases and the platform; two supporting pieces are symmetrically arranged on the upper portion of the platform, the two supporting pieces can oppositely slide on the upper portion of the platform and support the inner wall of the drill rod, and polishing pieces are connected to the two sides of the platform in the extending direction of the platform in a sliding mode. The inner walls of drill rods of different sizes can be positioned through the supporting piece, the drill rods of different specifications can be conveniently positioned, grinding operation is conducted in cooperation with the polishing piece, and the grinding efficiency of the drill rods can be effectively improved; and under the action of the grinding belt formed by mixing the composite grinding materials, the drill rod grinding device can adapt to grinding of drill rods with different diameters, and after single-time grinding operation is completed, the drill rod can be rotated under the cooperation of the polishing piece, so that all-directional grinding of the drill rod is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of compound abrasive polishing for drill pipe surfaces, and particularly to a compound abrasive polishing tool and a usage method for surface treatment of drill pipes in ultra-deep wells. Background Art

[0002] Drill pipes in ultra-deep wells are the core equipment for deep-earth exploration. They consist of a seamless steel pipe body and tool joints, and the connection strength is enhanced through thickening treatment (internal thickening, external thickening, or both internal and external thickening). The drill pipe transmits the surface power to the drill bit through rotation to drive the drill bit to break the formation rock. In ultra-deep wells, the drill pipe needs to bear more self-weight loads.

[0003] When the drill pipe rotates or moves up and down in the wellbore, the rough outer wall will have intense friction with the well wall, resulting in energy loss and drill pipe wear. Therefore, it is necessary to polish the outer wall of the drill pipe. The polished smooth surface can reduce the adhesion of cuttings and mud, avoid the risk of sticking the drill pipe, reduce the friction coefficient, and ultimately improve the drilling efficiency.

[0004] The polishing tool carries abrasive particles and rotates at high speed, contacting the drill pipe surface to generate frictional force, cutting and removing the surface oxide layer, burrs, and dents, and gradually grinding down the rough peak points.

[0005] Therefore, in order to improve the polishing efficiency of the surface of drill pipes in ultra-deep wells and be able to position and adaptively polish drill pipes of different specifications, a compound abrasive polishing tool and a usage method for surface treatment of drill pipes in ultra-deep wells are specifically proposed. Summary of the Invention

[0006] To solve the technical problems raised in the background art, the present invention provides a compound abrasive polishing tool and a usage method for surface treatment of drill pipes in ultra-deep wells.

[0007] The present invention is realized by the following technical solutions: A compound abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells includes a platform, a support member, and a polishing member.

[0008] Two bases are symmetrically and fixedly connected to the bottom end of the platform. There are grooves at the connection between the outer sides of the two bases and the platform. Two support members are symmetrically arranged on the upper part of the platform. The two support members can slide towards each other on the upper part of the platform and support the inner wall of the drill pipe. The polishing members are slidably connected along the extension direction of the platform on both sides of the platform. The polishing members can be attached to the outer wall of the drill pipe and polish the drill pipe as they slide horizontally.

[0009] After the upper part of the outer wall of the drill pipe is polished with the polishing member, when the polishing member continues to move vertically downward, its bottom end can further be attached to the drill pipe, and under the loosening of the two support members, the drill pipe is driven to flip, so that the unpolished outer wall of the drill pipe rotates to the upper part, and the polishing member is restarted to polish the drill pipe again.

[0010] As a further improvement of the above solution, the support member includes a displacement unit and a spreading unit. The displacement unit includes slide bars symmetrically and fixedly connected to both sides of the upper end of the platform. The slide bars are parallel to the extending direction of the platform. Communication ports are provided on both sides of the two slide bars. The top ends of the two slide bars are horizontally and slidably connected with movable plates. The bottom ends of the two movable plates are fixedly connected with bottom slide plates. The bottom slide plates slide horizontally in the communication ports. And a threaded groove opening is provided at the position of the bottom slide plate below the platform. One side of the platform is fixedly connected with a first motor. The output shaft of the first motor is fixedly connected with a bidirectional lead screw. The two sides of the bidirectional lead screw are respectively threadedly connected with the threaded groove openings of the bottom slide plates for synchronously driving the two movable plates to slide towards each other.

[0011] Specifically, pulleys are arranged at the joints of the two sides of the bottom end of the movable plate and the top of the platform.

[0012] Two hydraulic rods I are fixedly connected to the top ends of the two movable plates. The top ends of the two hydraulic rods I are fixedly connected with a top plate. A hydraulic rod II is installed at the top end of the top plate. A support I is fixedly connected to the outside of the hydraulic rod II and the hydraulic rod II is fixed by the support I. The output end of the hydraulic rod II faces the inside direction of the platform.

[0013] As a further improvement of the above solution, the spreading unit includes a sleeve coaxially and fixedly connected to one side of the hydraulic rod II. A circular plate is fixedly connected to the outside of the sleeve. A number of groups of vertical grooves I are circumferentially provided on the circular plate. The number of the vertical grooves I is at least three groups. A limiting slide plate is slidably connected in each vertical groove I along the radial direction of the circular plate. Specifically, the limiting slide plate can only slide horizontally along the vertical groove I. A side connecting rod is fixedly connected to the outside of each limiting slide plate outside the circular plate. Each side connecting rod is parallel to the end face of the circular plate. A support plate is fixedly connected to the outer end of each side connecting rod. A rubber strip is arranged at the connection between the outside of the support plate and the inner wall of the drill pipe.

[0014] An active block is fixedly connected to the outside of the circular plate at the output end of the hydraulic rod II. A number of side plates are circumferentially fixedly connected to the outer wall of the active block. The number of the side plates is the same as that of the vertical grooves I. An inclined groove opening is provided in each side plate. A first slide rod is slidably connected in each inclined groove opening. Each first slide rod is fixedly connected to the side connecting rod. When the output end of the hydraulic rod II expands and contracts, under the sliding connection between the inclined groove opening and the first slide rod, multiple support plates slide outwards / inwards synchronously to realize the support of the inner wall of the drill pipe and cooperate with the polishing part to rotate when the support is released.

[0015] As a further improvement of the above solution, the polishing part includes a support II fixedly connected to one side of the platform. A second motor is fixedly connected to the top of the support II. A screw rod is fixedly connected to the output shaft of the second motor. A connecting plate is threadedly connected to the screw rod. Two hydraulic rods III are symmetrically and fixedly connected to both sides of the connecting plate. The bottom ends of the two hydraulic rods III are fixedly connected with side slide plates. The two side slide plates are symmetrically and horizontally slidably connected to the outer groove of the platform.

[0016] The tops of two hydraulic rods three are respectively fixedly connected with outer plates. On the inner sides of the two outer plates, guiding plates are symmetrically and fixedly connected. On both sides of the two guiding plates, horizontal grooves are symmetrically opened. In both horizontal grooves, two sliding rods two are symmetrically and horizontally slidably connected. On both sides of the middle parts of the two guiding plates where the two sliding rods two are located, two folding frames are respectively fixedly connected. In the middle of the tops of the two groups of folding frames, a driving roller is rotatably connected. At the bottoms of the two groups of folding frames, driven rollers are respectively rotatably connected. And a polishing belt is sleeved outside the two driven rollers and one driving roller. Among them, protrusions are arranged at the driving roller and the driven rollers, and grooves matching the protrusions are arranged at the joints of the polishing belt and the three, so as to increase the transmission friction. On both sides of the two groups of folding frames, hanging rods are symmetrically and fixedly connected. And hanging springs are sleeved at the two hanging rods on the same side, which are used to keep the polishing belt in a tensioned state. Rubber protrusions are arranged on both sides of the outer walls of the two driven rollers. When the hydraulic rod three drives the whole outer plate to move downward, it cooperates with the rubber protrusions to bend and abut against the outer wall of the drill pipe. In the middle of the outer wall of one of the guiding plates, a support three is fixedly connected. The longitudinal section of the support three is L-shaped. A vertical slot two is opened in the middle of the upper section of the support three. A connecting block is vertically slidably connected in the vertical slot two. On one side of the connecting block, a sliding frame is fixedly connected. At the bottom end of the sliding frame, a motor three is fixedly connected. The output end of the motor three is coaxially fixedly connected with the driving roller.

[0017] The using method of the composite abrasive polishing tool for the surface treatment of ultra-deep well drill pipes is as follows: S1. Drill pipe conveying and positioning: After conveying the drill pipe to directly above the platform, start the displacement of the two supporting members and fix the inner walls of both ends of the drill pipe by expanding them. Specifically, start the motor one to drive the bidirectional lead screw to rotate, so that the bottom sliding plate can slide inward synchronously and contract. When the movable plate drives the hydraulic rod two at the top to move to both ends of the drill pipe, drive the two hydraulic rods two to expand and contract, and when the side plates are driven to displace by the movable block at the telescopic end of the hydraulic rod two, synchronously drive a plurality of supporting plates to slide outward synchronously and abut against the inner wall of the drill pipe; S2. Drill pipe polishing: While driving the polishing member to horizontally displace, polish the upper part of the drill pipe. Specifically, start the motor two to drive the screw rod to drive the whole polishing member to slide along the platform, and after sliding to the edge of the drill pipe, drive the hydraulic rod three to contract downward. As the bottom of the polishing belt descends, it will contact the upper part of the drill pipe and gradually fit with the outer surface of the drill pipe. The outside of the polishing belt grinds the drill pipe under the drive of the motor three, and when grinding, the motor two will rotate orderly, so that the whole hydraulic rod three slides to the other end of the drill pipe, completing the grinding of the contact area of the upper part of the drill pipe; S3. Drill pipe rotation and polishing: After completing the polishing of a single drill pipe, rotate the drill pipe with the cooperation of the polishing part and the support part, and finally complete the overall grinding of the drill pipe through the polishing part during the reciprocating sliding process. Specifically, it is necessary to continuously contract the hydraulic rod three to make the grinding belt fit more closely to the outer wall of the drill pipe, and make the rubber protrusions at the two driven rollers close to the drill pipe. The rotation of the drill pipe is realized by the abutment of the rubber protrusions and the drill pipe, so that the drill pipe rotates the unground area to the upper part and continues to be ground under the polishing part. S4. Drill pipe output and detection: After completing the overall inspection of the drill pipe, move the polishing part outside the platform, take out the drill pipe and detect its smoothness. Specifically, the smoothness should be lower than 0.8μm. The detection equipment for the outer wall of the drill pipe includes but is not limited to a laser scanning surface roughness meter. Drill pipes that do not meet the standard need to be re-ground, and drill pipes that meet the standard are transported to the storage area.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention can position the inner wall of drill pipes of different sizes through the support part, facilitate the positioning of drill pipes of different specifications, and cooperate with the polishing part for grinding operations, which can effectively improve the grinding efficiency of drill pipes.

[0019] 2. Under the action of the grinding belt made of composite abrasives, the present invention can adapt to drill pipes of different diameters for grinding. After completing a single grinding operation, it can rotate the drill pipe with the cooperation of the polishing part to achieve all-round grinding of the drill pipe.

[0020] 3. Under the elastic action of the two hanging springs, the present invention can make the two sets of folding frames expand outwards and keep the grinding belt in a tensioned state. After the abutment with the drill pipe is released after the polishing operation, it can still maintain the tensioned state. It can also quickly replace the grinding belt under the rotational connection between the two sets of folding frames and the driving roller to meet the normal polishing needs. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the overall structure of the composite abrasive polishing tool for the surface treatment of ultra-deep well drill pipes provided in Embodiment 1 of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the right side view structure; Figure 3 For the present invention Figure 1 Schematic diagram of the top view structure; Figure 4 For the present invention Figure 1 Schematic diagram of the bottom view structure; Figure 5 For the present invention Figure 1 Schematic diagram of the structure from the bottom view perspective; Figure 6 Structural schematic diagram of the support member of the present invention; Figure 7 For the present invention Figure 6 Explosion schematic diagram of the partial structure; Figure 8 Structural schematic diagrams of two states of the polishing member of the present invention; Figure 9 Three-dimensional structural schematic diagram of the polishing member of the present invention in the grinding state.

[0022] Main symbol description: 1. Platform; 2. Base; 3. Slide bar; 4. Movable plate; 5. Communication port; 6. Bottom slide plate; 7. First motor; 8. Bi-directional lead screw; 9. First hydraulic rod; 10. Top plate; 11. First bracket; 12. Second hydraulic rod; 13. Sleeve; 14. Circular plate; 15. First vertical groove; 16. Movable block; 17. Side plate; 18. Oblique groove opening; 19. First slide rod; 20. Side connecting rod; 21. Support plate; 22. Limit slide plate; 23. Side slide plate; 24. Third hydraulic rod; 25. Connecting plate; 26. Second bracket; 27. Second motor; 28. Screw; 29. Outer plate; 30. Guide plate; 31. Horizontal groove; 32. Second slide rod; 33. Folding bracket; 34. Driving roller; 35. Third motor; 36. Sliding bracket; 37. Connecting block; 38. Third bracket; 39. Second vertical groove; 40. Driven roller; 41. Grinding belt; 42. Rubber protrusion; 43. Hanging rod; 44. Hanging spring. Specific embodiments

[0023] Next, in combination with the accompanying drawings and specific embodiments, the present invention will be further described. It should be noted that, on the premise of no conflict, any combination of the following-described embodiments or technical features can form a new embodiment.

[0024] Embodiment 1: Please refer to Figure 1 , the composite abrasive polishing tool for surface treatment of ultra-deep well drill pipes in this embodiment includes a platform 1, a support member, and a polishing member.

[0025] At the bottom end of the platform 1, two bases 2 are symmetrically and fixedly connected. There are grooves at the connection between the outer sides of the two bases 2 and the platform 1. Two support members are symmetrically arranged on the upper part of the platform 1. The two support members can slide towards each other on the upper part of the platform 1 and support the inner wall of the drill pipe. On both sides of the platform 1, a polishing member is slidably connected along the extending direction of the platform 1. The polishing member can be attached to the outer wall of the drill pipe and polish the drill pipe as it slides horizontally.

[0026] After the polishing part completes grinding the upper outer wall of the drill rod, the polishing part can continue to move vertically downward, and its bottom end can further fit the drill rod, and the drill rod can be driven to flip when the supporting parts on both sides are loosened, so that the outer wall of the drill rod that has not been polished yet is rotated to the upper part, and the polishing part is started again to grind the drill rod.

[0027] The support member includes a displacement unit and an opening unit. The displacement unit includes slide bars 3 symmetrically fixedly connected to both sides of the upper end of the platform 1. The slide bars 3 are parallel to the extension direction of the platform 1. Connecting ports 5 are provided on both sides of the two slide bars 3. The top ends of the two slide bars 3 are horizontally slidably connected to movable plates 4. The bottom ends of the two movable plates 4 are fixedly connected to bottom slide plates 6. The bottom slide plates 6 slide horizontally in the connecting port 5, and the bottom slide plates 6 are provided with a threaded groove below the platform 1. One side of the platform 1 is fixedly connected to a motor 7. The output shaft of the motor 7 is fixedly connected to a bidirectional screw rod 8. The two sides of the bidirectional screw rod 8 are respectively threadedly connected to the threaded grooves of the bottom slide plate 6, so as to synchronously drive the two movable plates 4 to slide toward each other.

[0028] Specifically, pulleys are provided at the connection points between the bottom sides of the movable plate 4 and the top of the platform 1 .

[0029] The top ends of the two movable plates 4 are fixedly connected to two hydraulic rods 9, the top ends of the two hydraulic rods 9 are fixedly connected to a top plate 10, a hydraulic rod 2 12 is installed on the top end of the top plate 10, the hydraulic rod 2 12 is fixedly connected to a bracket 11 outside, and the hydraulic rod 2 12 is fixed by the bracket 11, and the output end of the hydraulic rod 2 12 faces the inner direction of the platform 1.

[0030] The expansion unit includes a sleeve 13 coaxially fixedly connected to one side of the hydraulic rod 12, a circular plate 14 is fixedly connected to the outer side of the sleeve 13, a plurality of groups of vertical grooves 15 are circumferentially opened on the circular plate 14, and the number of vertical grooves 15 is at least three groups. A limiting slide 22 is radially slidably connected to the circular plate 14 in each vertical groove 15. Specifically, the limiting slide 22 can only slide horizontally along the vertical groove 15. Each limiting slide 22 is located outside the circular plate 14 and is fixedly connected to a side connecting rod 20. Each side connecting rod 20 is parallel to the end face of the circular plate 14. The outer end of each side connecting rod 20 is fixedly connected to a support plate 21, and a rubber strip is provided at the connection between the outside of the support plate 21 and the inner wall of the drill pipe.

[0031] The output end of the second hydraulic rod 12 is fixedly connected with a movable block 16 outside the circular plate 14. A plurality of side plates 17 are fixedly connected to the outer wall of the movable block 16 in the circumferential direction. The number of side plates 17 is the same as that of the first vertical grooves 15. Each side plate 17 is provided with an obliquely inclined notch 18. A first sliding rod 19 is slidably connected in each notch 18. Each first sliding rod 19 is fixedly connected to a side connecting rod 20. When the output end of the second hydraulic rod 12 expands and contracts, under the sliding connection between the notch 18 and the first sliding rod 19, multiple support plates 21 can slide outward / inward synchronously, so as to realize the support for the inner wall of the drill pipe and cooperate with the polishing part to rotate when the support for the inner wall of the drill pipe is released.

[0032] The implementation principle of the composite abrasive polishing tool for surface treatment of ultra-deep well drill pipes in the embodiment of the present application is as follows: The drill pipe to be polished is conveyed to the device by a clamping robotic arm (including but not limited to a clamping robotic arm, and other conveying devices can also be used as long as the conveying function is achieved). The first motor 7 is started to drive the bidirectional lead screw 8 to rotate. Due to the characteristics of the bidirectional lead screw 8, the bottom sliding plates 6 on both sides can slide inward and contract synchronously. With the cooperation of the first hydraulic rod 9, the telescopic end of the second hydraulic rod 12 is coaxially aligned with the drill pipe. When the movable plate 4 drives the second hydraulic rod 12 at the top to move to both ends of the drill pipe, the two second hydraulic rods 12 are synchronously driven to perform telescopic actions. Since the position of the circular plate 14 remains unchanged relative to the second hydraulic rod 12, when the movable block 16 expands and contracts outward with the telescopic end of the second hydraulic rod 12, it will synchronously drive the side plates 17 to displace outward. When the side plates 17 displace, multiple support plates 21 can be synchronously driven to slide outward and press against the inner wall of the drill pipe, ensuring the stability of the subsequent grinding operation of the drill pipe.

[0033] After the upper area of the outer wall of the drill pipe is ground subsequently, the two support plates 21 can be synchronously controlled to contract slightly inward, so as to provide a moving space for the rotation of the drill pipe, enabling the drill pipe to rotate synchronously to achieve the overall polishing operation of the outer wall of the drill pipe.

[0034] Embodiment 2: Combining Figure 1 、 Figure 2 、 Figure 5 、 Figure 8 and Figure 9 On the basis of Embodiment 1, the further improvement of this embodiment lies in: The polishing part includes a second bracket 26 fixedly connected to one side of the platform 1. A second motor 27 is fixedly connected to the top of the second bracket 26. A screw rod 28 is fixedly connected to the output shaft of the second motor 27. The screw rod 28 is threadedly connected to a connecting plate 25. Hydraulic rods three 24 are symmetrically and fixedly connected to both sides of the connecting plate 25. The bottom ends of the two hydraulic rods three 24 are both fixedly connected to side sliding plates 23. The two side sliding plates 23 are symmetrically and horizontally slidably connected to the outer grooves of the platform 1.

[0035] The tops of two hydraulic rods three 24 are respectively fixedly connected with outer plates 29. The inner sides of the two outer plates 29 are symmetrically and fixedly connected with guide plates 30. Horizontal grooves 31 are symmetrically formed on both sides of the two guide plates 30. Two sliding rods two 32 are symmetrically and horizontally slidably connected to the two horizontal grooves 31. Two folding frames 33 are respectively fixedly connected to the middle sides of the two guide plates 30 where the two sliding rods two 32 are located. The middle parts of the tops of the two groups of folding frames 33 are rotatably connected with a driving roller 34. The bottoms of the two groups of folding frames 33 are respectively rotatably connected with driven rollers 40. A polishing belt 41 is sleeved outside the two driven rollers 40 and one driving roller 34. Protrusions are arranged at the driving roller 34 and the driven rollers 40. Grooves matching the protrusions are arranged at the connection parts of the polishing belt 41 and the three to increase the driving friction. Hanging rods 43 are symmetrically and fixedly connected to both sides of the two groups of folding frames 33. Hanging springs 44 are sleeved at the two hanging rods 43 on the same side for keeping the polishing belt 41 in a tensioned state. Rubber protrusions 42 are arranged on both outer sides of the outer walls of the two driven rollers 40. When the hydraulic rod three 24 drives the whole outer plate 29 to move downward, the polishing belt 41 is bent and abuts against the outer wall of the drill pipe in cooperation with the rubber protrusions 42. The middle part of the outer wall of one of the guide plates 30 is fixedly connected with a support three 38. The longitudinal section of the support three 38 is L-shaped. A vertical slot two 39 is formed in the middle of the upper section of the support three 38. A connecting block 37 is vertically slidably connected in the vertical slot two 39. One side of the connecting block 37 is fixedly connected with a sliding frame 36. The bottom end of the sliding frame 36 is fixedly connected with a motor three 35. The output end of the motor three 35 is coaxially and fixedly connected with the driving roller 34.

[0036] Specifically, when the polishing belt 41 does not abut against the outer wall of the drill pipe, the two hanging springs 44 can push the folding frames 33 to expand outward elastically, and the two driven rollers 40 at the bottom ends can pull the polishing belt 41 outward to keep it in a tensioned state. When the polishing belt 41 directly abuts against the outer wall of the drill pipe and deforms after fitting the outer wall of the drill pipe, the two driven rollers 40 will synchronously move towards the bottom end of the drill pipe and contract, so that the polishing belt 41 can better fit the outer wall of the drill pipe. Under the friction of the rubber protrusions 42 abutting against the drill pipe, the drill pipe can be driven to rotate, so that the surface of the unpolished drill pipe can be adjusted to the upper part (as shown on the right side in the figure), so as to better cooperate with the polishing belt 41 for polishing operation. After the adjustment is completed, the hydraulic rod three 24 rises again to make the polishing belt 41 return (as shown on the left side in the figure). Figure 8 The right side in the figure), so as to better cooperate with the polishing belt 41 for polishing operation. After the adjustment is completed, the hydraulic rod three 24 rises again to make the polishing belt 41 return (as shown on the left side in the figure). Figure 8 The left side in the figure).

[0037] The implementation principle of the composite abrasive polishing tool for the surface treatment of ultra-deep well drill pipes in the embodiment of the present application is as follows: After the drill pipe is supported, start the second motor 27 to drive the screw rod 28 to rotate, and rely on the screw rod 28 to drive the connecting plate 25 and the side sliding plates 23 on both sides to slide along the platform 1. After the side sliding plates 23 slide to the edge of the drill pipe, synchronously drive the two third hydraulic rods 24 to contract downward, so that the two outer plates 29 drive the guiding plate 30 to descend. At this time, the upper part of the drill pipe directly above the platform 1 will first contact the bottom of the grinding belt 41. As the third hydraulic rod 24 continues to descend, the two driven rollers 40 will synchronously contract inward under the contact of the grinding belt 41 and the upper part of the drill pipe (as shown in Figure 8 the left state schematic diagram), then start the third motor 35 to drive the driving roller 34. Under the transmission inside the grinding belt 41 between the driving roller 34 and the grinding belt 41, synchronously drive the two driven rollers 40 to follow, so as to realize the grinding of the contact area of the drill pipe by the grinding belt 41. During the grinding, the second motor 27 will rotate orderly, so that the third hydraulic rod 24 drives the grinding belt 41 to move synchronously, gradually slide from one end of the drill pipe to the other end, and complete the grinding of the upper part of the drill pipe.

[0038] At this time, continuously contract the third hydraulic rod 24 to make the grinding belt 41 fit more closely to the outer wall of the drill pipe, and make the rubber protrusions 42 at the two driven rollers 40 press tightly against the drill pipe. At the same time, loosen the support of the inner wall of the drill pipe, drive the third motor 35 to make the drill pipe rotate under the abutment of the rubber protrusions 42 and the drill pipe, so that the drill pipe rotates the unground area to the upper part, then drive the third hydraulic rod 24 to rise to make it in the grinding operation state, and at the same time start the second motor 27 and the third motor 35 for the grinding operation during the return journey.

[0039] When the grinding operation is completed, move the entire side sliding plate 23 outside the drill pipe through the second motor 27, so as to facilitate the removal of the drill pipe.

[0040] Example 3: Combine Figures 1-9 , the usage method of the composite abrasive polishing tool for the surface treatment of ultra-deep well drill pipes is as follows: S1. Drill pipe transportation and positioning: After transporting the drill pipe directly above the platform 1, start the displacement of the two support members and expand and fix the inner walls of both ends of the drill pipe. Specifically, start the first motor 7 to drive the bidirectional lead screw 8 to rotate, so that the bottom sliding plate 6 can synchronously slide inward and contract. When the movable plate 4 drives the top third hydraulic rod 12 to move to both ends of the drill pipe, drive the two third hydraulic rods 12 to perform telescopic actions, and drive the side plates 17 to displace synchronously through the movable blocks 16 when the telescopic ends of the third hydraulic rods 12 change, and synchronously drive a plurality of support plates 21 to slide outward and abut against the inner wall of the drill pipe; S2. Drill pipe polishing: While driving the polishing part to move horizontally, the upper part of the drill pipe is polished. Specifically, start Motor 27 to drive the screw rod 28 to drive the entire polishing part to slide along the platform 1. After sliding to the edge of the drill pipe, drive the third hydraulic rod 24 to contract downward. As the bottom of the polishing belt 41 descends, it will contact the upper part of the drill pipe and gradually fit the outer surface of the drill pipe. The outside of the polishing belt 41 is driven by Motor 35 to polish the drill pipe. When polishing, Motor 27 will rotate orderly, so that the entire third hydraulic rod 24 slides to the other end of the drill pipe, completing the polishing of the contact area on the upper part of the drill pipe; S3. Drill pipe rotation and polishing: After completing the polishing of a single drill pipe, the drill pipe is rotated with the cooperation of the polishing part and the support part, and the entire drill pipe is finally polished through the polishing part during the reciprocating sliding process. Specifically, it is necessary to continuously contract the third hydraulic rod 24 to make the polishing belt 41 fit the outer wall of the drill pipe more closely, and make the rubber protrusions 42 at the two driven rollers 40 press against the drill pipe. The rotation of the drill pipe is realized by the abutment of the rubber protrusions 42 against the drill pipe, so that the unpolished area of the drill pipe is rotated to the upper part and continues to be polished under the polishing part; S4. Drill pipe output and inspection: When the comprehensive inspection of the drill pipe is completed, move the polishing part outside the platform 1, take out the drill pipe and inspect its smoothness. Specifically, the smoothness should be lower than 0.8μm. The inspection equipment for the outer wall of the drill pipe includes but is not limited to a laser scanning surface roughness meter. Drill pipes that do not meet the standards need to be polished again, and drill pipes that meet the standards are transported to the storage area.

[0041] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A composite abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells, characterized in that Including: A platform (1), at the bottom end of the platform (1), two bases (2) are symmetrically and fixedly connected. There are grooves at the connection between the outer sides of the two bases (2) and the platform (1). Two support members are symmetrically arranged on the upper part of the platform (1). The two support members can slide towards each other on the upper part of the platform (1) and support the inner wall of the drill pipe. On both sides of the platform (1), polishing members are slidably connected along the extending direction of the platform (1). The polishing members can be attached to the outer wall of the drill pipe and polish the drill pipe as they slide horizontally; Among them, after the upper part of the outer wall of the drill pipe is polished by the polishing member, when the polishing member continues to move vertically downward, its bottom end can further be attached to the drill pipe, and under the loosening of the two support members, the drill pipe is driven to flip, so that the unpolished outer wall of the drill pipe rotates to the upper part, and the polishing member is restarted to polish the drill pipe again.

2. The composite abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells according to claim 1, characterized in that, The support member includes a displacement unit and a spreading unit. The displacement unit includes slide bars (3) symmetrically and fixedly connected to both sides of the upper end of the platform (1). The slide bars (3) are parallel to the extending direction of the platform (1). Communication ports (5) are opened on both sides of the two slide bars (3). At the top ends of the two slide bars (3), movable plates (4) are horizontally slidably connected. At the bottom ends of the two movable plates (4), bottom slide plates (6) are fixedly connected. The bottom slide plates (6) slide horizontally in the communication ports (5), and a threaded groove opening is provided at the position of the bottom slide plates (6) below the platform (1). A motor one (7) is fixedly connected to one side of the platform (1). The output shaft of the motor one (7) is fixedly connected with a bidirectional lead screw (8). The two sides of the bidirectional lead screw (8) are respectively threadedly connected with the threaded groove openings of the bottom slide plates (6) for synchronously driving the two movable plates (4) to slide towards each other.

3. The composite abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells according to claim 2, characterized in that, At the top ends of the two movable plates (4), two hydraulic rods one (9) are fixedly connected. At the top ends of the two hydraulic rods one (9), a top plate (10) is fixedly connected. At the top end of the top plate (10), a hydraulic rod two (12) is installed. A support one (11) is fixedly connected to the outside of the hydraulic rod two (12), and the hydraulic rod two (12) is fixed by the support one (11). The output end of the hydraulic rod two (12) faces the inside direction of the platform (1).

4. The composite abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells according to claim 3, characterized in that, The spreading unit includes a sleeve (13) coaxially and fixedly connected to one side of the hydraulic rod two (12). A circular plate (14) is fixedly connected to the outside of the sleeve (13). A number of groups of vertical slots one (15) are circumferentially opened on the circular plate (14). The number of the vertical slots one (15) is at least three groups. In each vertical slot one (15), a limiting slide plate (22) is slidably connected along the radial direction of the circular plate (14). Outside the circular plate (14), a side connecting rod (20) is fixedly connected to each limiting slide plate (22). Each side connecting rod (20) is parallel to the end face of the circular plate (14). At the outer ends of each side connecting rod (20), a support plate (21) is fixedly connected.

5. The composite abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells according to claim 4, characterized in that, The output end of the second hydraulic rod (12) is located outside the circular plate (14) and fixedly connected with a movable block (16). A plurality of side plates (17) are fixedly connected to the outer wall of the movable block (16) in the circumferential direction. The number of side plates (17) is the same as that of the first vertical grooves (15). Each side plate (17) is provided with an obliquely inclined slotted opening (18). A first sliding rod (19) is slidably connected in each slotted opening (18). Each first sliding rod (19) is fixedly connected with a side connecting rod (20). When the output end of the second hydraulic rod (12) expands and contracts, under the sliding connection between the slotted opening (18) and the first sliding rod (19), a plurality of support plates (21) can slide out / inside synchronously.

6. The composite abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells according to claim 1, characterized in that, The polishing part includes a second bracket (26) fixedly connected to one side of the platform (1). A second motor (27) is fixedly connected to the top of the second bracket (26). A screw rod (28) is fixedly connected to the output shaft of the second motor (27). A connecting plate (25) is threadedly connected to the screw rod (28). Two third hydraulic rods (24) are symmetrically and fixedly connected to both sides of the connecting plate (25). The bottom ends of the two third hydraulic rods (24) are both fixedly connected with side sliding plates (23). The two side sliding plates (23) are symmetrically and horizontally slidably connected to the outer groove of the platform (1).

7. The composite abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells according to claim 6, characterized in that, The top ends of the two third hydraulic rods (24) are respectively fixedly connected with outer plates (29). Guide plates (30) are symmetrically and fixedly connected to the inner sides of the two outer plates (29). Horizontal grooves (31) are symmetrically opened on both sides of the two guide plates (30). Second sliding rods (32) are symmetrically and horizontally slidably connected in the two horizontal grooves (31). Two folding frames (33) are respectively fixedly connected to the middle parts of both sides of the two second sliding rods (32) located on both sides of the two guide plates (30). A driving roller (34) is rotatably connected to the middle parts of the tops of the two groups of folding frames (33). Driven rollers (40) are respectively rotatably connected to the bottom ends of the two groups of folding frames (33). A polishing belt (41) is sleeved outside the two driven rollers (40) and a driving roller (34).

8. The composite abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells according to claim 7, characterized in that, Hanging rods (43) are symmetrically and fixedly connected to both sides of the two groups of folding frames (33). Hanging springs (44) are sleeved at the two hanging rods (43) on the same side, which is used to keep the polishing belt (41) in a tensioned state. Rubber protrusions (42) are arranged on both sides of the outer walls of the two driven rollers (40). When the third hydraulic rod (24) drives the whole outer plate (29) to move downwards, the rubber protrusions (42) are used to bend and abut against the outer wall of the drill pipe in cooperation.

9. The composite abrasive polishing tool for surface treatment of drill pipes in ultra-deep wells according to claim 7, characterized in that, A third bracket (38) is fixedly connected to the middle part of the outer wall of one of the guide plates (30). The longitudinal section of the third bracket (38) is L-shaped. A vertical second vertical groove (39) is opened in the middle part of the upper section of the third bracket (38). A connecting block (37) is vertically slidably connected in the second vertical groove (39). A sliding frame (36) is fixedly connected to one side of the connecting block (37). A third motor (35) is fixedly connected to the bottom end of the sliding frame (36). The output end of the third motor (35) is coaxially and fixedly connected to the driving roller (34).

10. Method for using a composite abrasive polishing tool for surface treatment of drill pipes for ultra-deep wells, characterized in that, It is applied to the composite abrasive polishing tool for surface treatment of ultra-deep well drill pipes according to any one of claims 1-9. The using method is as follows: S1. Drill pipe transportation and positioning: After transporting the drill pipe to directly above the platform (1), start the displacement of the two support members and expand and fix the inner walls at both ends of the drill pipe. S2. Drill pipe polishing: While driving the polishing member to move horizontally, polish the upper part of the drill pipe. S3. Drill pipe rotation and polishing: After completing the polishing of a single drill pipe, rotate the drill pipe under the cooperation of the polishing member and the support member, and with the polishing member sliding reciprocally, complete the overall polishing of the drill pipe. S4. Drill pipe output and inspection: When the overall inspection of the drill pipe is completed, move the polishing member outside the platform (1), take out the drill pipe and inspect its smoothness.

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