A pulse torsion buckle for well repair

Abstract

The invention discloses a pulse torsion backhoe for well repair, comprising an outer cylinder component (10); a pulse pressure generator composed of a valve stem component (20) and a central shaft component (30) is arranged in the outer cylinder component (10) from top to bottom, and the pulse shaft thrust generated by the pulse pressure generator is converted into a pulse rotation torque through a conversion component (40); the pulse rotation torque forms a pulse torque on the required backhoe thread through a torque transmission component (50), thereby improving the success rate of backhoe of the drilling tool. The invention performs backhoe operation together with the backhoe drilling tool, and after applying the maximum backhoe torque, the lower drilling tool still cannot be backhoeped. At this time, the mud pump can be turned on, and the mud pressure is converted into a pulse torque through the pulse torsion backhoe and provided to the mandrel, thereby increasing the backhoe impact torque, thereby improving the success rate of backhoe.

Description

Technical Field

[0001] The invention relates to a pulse torsion buckle for well repair, belonging to the technical field of oilfield drilling tools. Background Art

[0002] In the prior art, when repairing a well, the reverse drilling tool is generally used to reverse the well. The success rate of reverse drilling is low. When the maximum torque is reached and the drill cannot be reversed, the torque is increased to force the reverse drilling tool to break. Forced reverse drilling is very likely to cause the reverse drilling tool to break. Another method is to reverse the well after explosive loosening. The cost of explosive loosening is too high and the operation is complicated. It is generally not considered and is only used as a last resort. Therefore, the prior art still has shortcomings and needs to be further improved. Summary of the invention

[0003] The object of the present invention is to provide a pulse torsion backhoe for well repair, which increases the backhoe impact torque by converting mud pressure into pulse torque and providing it to the mandrel, thereby improving the backhoe success rate and overcoming the shortcomings of the prior art.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A pulse torsion screwdriver for well repairing of the present invention comprises an outer cylinder assembly; a pulse pressure generator composed of a valve stem assembly and a central axis assembly is arranged in sequence from top to bottom in the outer cylinder assembly; the pulse shaft thrust generated by the pulse pressure generator is converted into a pulse rotation torque through a conversion assembly; the pulse rotation torque forms a pulse torque on the thread required for screwing of the drilling tool through a torque transmission assembly, thereby improving the success rate of screwing of the drilling tool.

[0006] In the aforementioned pulse torsion buckle for well repair, the outer cylinder assembly includes an upper joint, an upper connector, a connector, a spline body, and a spline sleeve which are threadedly connected in sequence from top to bottom; and connection sealing rings are provided outside all threaded connections.

[0007] In the aforementioned pulse torsion buckle for well repair, the valve stem assembly is located in the upper joint, and the valve stem assembly includes a valve stem; an upper ring sleeve, a middle ring sleeve and a lower ring sleeve are arranged on the outside of the valve stem from top to bottom; a spring is arranged between the upper ring sleeve and the middle ring sleeve; a valve stem rectangular spring is arranged between the middle ring sleeve and the lower ring sleeve; an adjustment pad is arranged between the bottom of the valve stem rectangular spring and the lower ring sleeve.

[0008] In the aforementioned pulse torsion buckle for well repair, bypass holes are provided at the upper and lower ends of the valve stem and on the upper ring sleeve and the middle ring sleeve.

[0009] In the aforementioned pulse torsion reverser for well repair, the central shaft assembly is located inside the upper connector and the connector, and the central shaft assembly includes a central shaft; a valve seat is provided on the top of the central shaft; a central shaft rectangular spring is provided between the shaft shoulder of the central shaft and the upper end surface of the connector, and a limit sleeve is provided outside the central shaft rectangular spring; and a top ring is provided on the lower end surface of the central shaft.

[0010] In the aforementioned pulse torsion turnbuckle for well repair, the valve seat is connected to the central axis via a stabilizing pin.

[0011] In the aforementioned pulse torsion screwdriver for well repair, the conversion assembly is located in the upper inner part of the spline body; the conversion assembly includes a torque transmission sleeve; the outer circle of the torque transmission sleeve is spline-connected to the spline of the spline body; the inner circle of the torque transmission sleeve is connected to the torque transmission shaft via a nine-head large pitch and small helix angle thread, driving the torque transmission shaft to rotate; a torque transmission shaft rectangular spring is provided outside the torque transmission shaft; a retaining ring is provided on the top of the torque transmission shaft rectangular spring.

[0012] In the aforementioned pulse torsion screwdriver for well repair, the torque transmission assembly is located in the lower part of the spline body; the torque transmission assembly includes a transmission sleeve; the upper part of the inner hole of the transmission sleeve is connected to the torque transmission shaft tooth shape; the lower part of the inner hole of the transmission sleeve is threadedly connected to the core shaft located in the spline sleeve.

[0013] In the aforementioned pulse torsion screwdriver for well repair, sealing rings are provided between the stabilizing pin and the central shaft, between the central shaft and the upper connector, between the torque transmission shaft and the spindle, and between the spindle and the spline sleeve.

[0014] In the aforementioned pulse torsion buckle for well repair, wear-resistant belts are provided between the central shaft and the torque transmission shaft and between the mandrel and the spline sleeve; and a dust ring is provided between the mandrel and the spline sleeve.

[0015] Due to the adoption of the above technical scheme, compared with the prior art, the present invention performs backlash operation together with the backlash drill bit. After applying the maximum backlash torque, the lower drill bit still cannot be reversed. At this time, the mud pump can be turned on to convert the mud pressure into a pulse torque through the pulse torsion backlash device and provide it to the core shaft, thereby increasing the backlash impact torque and thus improving the success rate of backlash. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the outer cylinder assembly of the present invention;

[0018] Figure 3 is a schematic structural diagram of a valve stem assembly of the present invention;

[0019] Figure 4 is a schematic structural diagram of a central axis assembly of the present invention;

[0020] Figure 5 is a schematic diagram of the structure of the conversion assembly of the present invention;

[0021] Figure 6 It is a schematic structural diagram of the torque transmission assembly of the present invention.

[0022] The markings in the attached drawings are: 01-seal ring, 02-wear-resistant belt, 03-dust ring, 10-outer tube assembly, 11-upper joint, 12-upper connector, 13-connector, 14-spline body, 15-spline sleeve, 16-connecting seal ring, 20-valve stem assembly, 21-valve stem, 22-upper ring sleeve, 23-middle ring sleeve, 24-lower ring sleeve, 25-spring, 26-valve stem rectangular spring, 27-adjusting pad, 2 8-bypass hole, 30-center shaft assembly, 31-center shaft, 32-valve seat, 33-center shaft rectangular spring, 34-limit sleeve, 35-top ring, 36-stabilizing pin, 40-conversion assembly, 41-torque transmission outer sleeve, 42-nine-head large pitch small helix angle thread, 43-torque transmission shaft, 44-torque transmission shaft rectangular spring, 45-retaining ring, 50-torque transmission assembly, 51-transmission sleeve, 52-central shaft. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] A pulse torsion buckle for well repairing of the present invention, such as Figure 1 to Figure 6 As shown, it includes an outer cylinder component 10; a pulse pressure generator composed of a valve stem component 20 and a central axis component 30 is arranged in sequence from top to bottom in the outer cylinder component 10; the pulse shaft thrust generated by the pulse pressure generator is converted into a pulse rotation torque through a conversion component 40; the pulse rotation torque forms a pulse torque on the required undercut thread through a torque transmission component 50, thereby improving the success rate of undercutting of the drilling tool.

[0025] The outer cylinder assembly 10 comprises an upper joint 11, an upper connector 12, a connector 13, a spline body 14, and a spline sleeve 15 which are threadedly connected in sequence from top to bottom; all threaded connections are provided with connection sealing rings 16.

[0026] The above-mentioned valve stem assembly 20 is located in the upper joint 11, and the valve stem assembly 20 includes a valve stem 21; an upper ring sleeve 22, a middle ring sleeve 23 and a lower ring sleeve 24 are arranged on the outside of the valve stem 21 from top to bottom; a spring 25 is arranged between the upper ring sleeve 22 and the middle ring sleeve 23; a valve stem rectangular spring 26 is arranged between the middle ring sleeve 23 and the lower ring sleeve 24; an adjustment pad 27 is arranged between the bottom of the valve stem rectangular spring 26 and the lower ring sleeve 24.

[0027] Bypass holes 28 are provided at the upper and lower ends of the valve stem 21 as well as the upper ring sleeve 22 and the middle ring sleeve 23 .

[0028] The above-mentioned central axis assembly 30 is located inside the upper connector 12 and the connector 13, and the central axis assembly 30 includes a central axis 31; a valve seat 32 is provided on the top of the central axis 31; a central axis rectangular spring 33 is provided between the shaft shoulder of the central axis 31 and the upper end surface of the connector 13, and a limit sleeve 34 is provided outside the central axis rectangular spring 33; a top ring 35 is provided on the lower end surface of the central axis 31.

[0029] The valve seat 32 is connected to the central shaft 31 via a stabilizing pin 36 .

[0030] The above-mentioned conversion assembly 40 is located at the upper inner part of the spline body 14; the conversion assembly 40 includes a torque transmission sleeve 41; the outer circle of the torque transmission sleeve 41 is spline-connected with the spline body 14; the inner circle of the torque transmission sleeve 41 is connected to the torque transmission shaft 43 through a nine-head large pitch and small helix angle thread 42, driving the torque transmission shaft 43 to rotate; a torque transmission shaft rectangular spring 44 is provided outside the torque transmission shaft 43; a retaining ring 45 is provided on the top of the torque transmission shaft rectangular spring 44.

[0031] The torque transmission assembly 50 is located in the lower part of the spline body 14 ; the torque transmission assembly 50 includes a transmission sleeve 51 ; the upper part of the inner hole of the transmission sleeve 51 is toothedly connected to the torque transmission shaft 43 ; the lower part of the inner hole of the transmission sleeve 51 is threadedly connected to the spindle 52 located in the spline sleeve 15 .

[0032] Sealing rings 01 are provided between the stabilizing pin 36 and the central shaft 31 , between the central shaft 31 and the upper connector 12 , between the torque transmission shaft 43 and the spindle 52 , and between the spindle 52 and the spline sleeve 15 .

[0033] A wear-resistant belt 02 is provided between the central shaft 31 and the torque transmission shaft 43 and between the spindle 52 and the spline sleeve 15 ; a dustproof ring 03 is provided between the spindle 52 and the spline sleeve 15 .

[0034] Working principle of the invention

[0035] When the pulse torsion buckle for well repairing of the present invention is used, pulse pressure is generated under the action of mud. The high-speed flow of mud drives the valve stem 21 to move downward, and at the same time drives the upper ring sleeve 22 to move downward, compressing the spring 25. The spring force acts on the middle ring sleeve 23, thereby compressing the valve stem rectangular spring 26. When the valve stem 21 moves to the point where the lower end face fits with the upper end face of the valve seat 32, a closed space is formed. Due to the action of the mud pump, high pressure is formed. This high pressure acts on the central axis 31 to form a thrust. At the moment when the valve stem 21 fits with the upper end face of the valve seat 32, the entire cavity above the valve seat 32 is a closed cavity, and the mud flow stops. Under the action of the spring force, the valve stem 21 returns to its original position. At the moment when the central axis 31 moves downward, the mud flow resumes. Under the action of the central axis rectangular spring 33, the central axis 31 is restored to its initial position, so that the mud resumes high-speed flow and the next thrust will begin. This thrust will form a pulse thrust with a certain period. The pulse thrust is transmitted downward to the top ring 35, and the top ring 35 is transmitted to the torque transmission sleeve 41. The torque transmission sleeve 41 is connected to the spline body 14 through an external spline so that it can only slide up and down, and can only slide up and down under the action of the thrust. Under the action of the rectangular spring 44 of the torque transmission shaft, the torque transmission sleeve 41 is restored to its original position after one transmission. The torque transmission sleeve 41 is connected to the torque transmission shaft 43 through the nine-head large pitch and small helix angle thread 42, which converts the pulse thrust into a pulse torque. The torque transmission shaft 43 is connected to the transmission sleeve 51 by a toothed connection to transmit the pulse torque to the mandrel 52. A pulse impact torque is formed on the required undercut thread through the mandrel 52 to improve the success rate of undercutting the drilling tool.

[0036] The present invention performs back-cutting operation together with the back-cutting drill bit. After applying the maximum back-cutting torque, if the lower drill bit still cannot be back-cut, the mud pump can be turned on at this time, and the mud pressure is converted into a pulse torque through the pulse torsion back-cutting device and provided to the mandrel, thereby increasing the back-cutting impact torque and improving the back-cutting success rate.

Claims

1. A pulse torsion backhoe for well repair, comprising an outer cylinder assembly (10); characterized in that: A pulse pressure generator consisting of a valve stem assembly (20) and a central shaft assembly (30) is arranged in sequence from top to bottom in the outer cylinder assembly (10). The pulse shaft thrust generated by the pulse pressure generator is converted into a pulse rotation torque through a conversion assembly (40). The pulse rotation torque forms a pulse torque on the thread required for undercutting the drill tool through a torque transmission assembly (50), thereby improving the success rate of undercutting the drill tool. The outer cylinder assembly (10) comprises an upper joint (11), an upper connecting body (12), a connecting body (13), a spline body (14), and a spline sleeve (15) which are threadedly connected in sequence from top to bottom; all threaded connections are provided with connecting sealing rings (16); The valve stem assembly (20) is located in the upper joint (11), and comprises a valve stem (21); an upper ring sleeve (22), a middle ring sleeve (23) and a lower ring sleeve (24) are arranged outside the valve stem (21) in order from top to bottom; a spring (25) is arranged between the upper ring sleeve (22) and the middle ring sleeve (23); a valve stem rectangular spring (26) is arranged between the middle ring sleeve (23) and the lower ring sleeve (24); an adjustment pad (27) is arranged between the bottom of the valve stem rectangular spring (26) and the lower ring sleeve (24); Bypass holes (28) are provided at the upper and lower ends of the valve stem (21) and on the upper ring sleeve (22) and the middle ring sleeve (23); The central shaft assembly (30) is located inside the upper connecting body (12) and the connecting body (13), and comprises a central shaft (31); a valve seat (32) is provided at the top of the central shaft (31); a central shaft rectangular spring (33) is provided between the shaft shoulder of the central shaft (31) and the upper end surface of the connecting body (13), and a limit sleeve (34) is provided outside the central shaft rectangular spring (33); and a top ring (35) is provided at the lower end surface of the central shaft (31); The conversion assembly (40) is located at the upper inner portion of the spline body (14); the conversion assembly (40) comprises a torque transmission outer sleeve (41); the outer circle of the torque transmission outer sleeve (41) is spline-connected to the spline body (14); the inner circle of the torque transmission outer sleeve (41) is connected to the torque transmission shaft (43) via a nine-start large pitch small helix angle thread (42), driving the torque transmission shaft (43) to rotate; a torque transmission shaft rectangular spring (44) is disposed outside the torque transmission shaft (43); a retaining ring (45) is disposed at the top of the torque transmission shaft rectangular spring (44); The torque transmission assembly (50) is located in the lower part of the spline body (14); the torque transmission assembly (50) comprises a transmission sleeve (51); the upper part of the inner hole of the transmission sleeve (51) is tooth-connected to the torque transmission shaft (43); the lower part of the inner hole of the transmission sleeve (51) is threadedly connected to the spindle (52) located in the spline sleeve (15); The valve seat (32) is connected to the central shaft (31) via a stabilizing pin (36); Sealing rings (01) are provided between the stabilizing pin (36) and the central shaft (31), between the central shaft (31) and the upper connecting body (12), between the torque transmission shaft (43) and the spindle (52), and between the spindle (52) and the spline sleeve (15); A wear-resistant belt (02) is provided between the central shaft (31) and the torque transmission shaft (43) and between the central shaft (52) and the spline sleeve (15); and a dustproof ring (03) is provided between the central shaft (52) and the spline sleeve (15).

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