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CN-224228634-U - Torsion mechanism of hydraulic back-off device

CN224228634UCN 224228634 UCN224228634 UCN 224228634UCN-224228634-U

Abstract

The utility model discloses a torsion mechanism of a hydraulic back-off device, which comprises a ball outer cylinder, wherein a piston cylinder is arranged in the ball outer cylinder, a ball torque shaft is arranged in the piston cylinder, the lower end of the ball torque shaft is exposed from the lower end of the ball outer cylinder, a plurality of ball outer cylinder spiral guide grooves are formed in the inner wall surface of the lower part of the ball outer cylinder, a plurality of piston cylinder spiral guide grooves are formed in the outer wall surface of the lower part of the piston cylinder, a plurality of piston cylinder ball grooves are formed in the inner wall surface of the lower part of the piston cylinder, through holes penetrating through the wall surface of the piston cylinder are formed in both ends of the piston cylinder spiral guide grooves, the piston cylinder spiral guide grooves are communicated with the piston cylinder ball grooves at corresponding positions, a plurality of torque shaft ball grooves are formed in the outer wall surface of the upper part of the ball torque shaft, a plurality of steel balls are arranged in the piston cylinder spiral guide grooves and the piston cylinder ball grooves, and a plurality of limit bolts are arranged in a cavity between the outer wall surface of the ball torque shaft and the inner wall surface of the ball outer cylinder, and the limit bolts seal the steel balls in the piston cylinder ball grooves.

Inventors

  • DONG DAN

Assignees

  • 赛德斯达(成都)能源科技有限公司

Dates

Publication Date
20260512
Application Date
20250609

Claims (8)

  1. 1. The hydraulic back-off device torsion mechanism is characterized by comprising a ball outer cylinder (1), wherein a piston cylinder (2) is arranged in the ball outer cylinder (1), a ball torque shaft (5) is arranged in the piston cylinder (2), the lower end of the ball torque shaft (5) is exposed from the lower end of the ball outer cylinder (1), a plurality of ball outer cylinder spiral guide grooves (11) are formed in the inner wall surface of the lower part of the ball outer cylinder (1), a plurality of piston cylinder spiral guide grooves (21) are formed in the outer wall surface of the lower part of the piston cylinder (2), a plurality of piston cylinder ball grooves (22) are formed in the inner wall surface of the lower part of the piston cylinder (2), through holes (23) penetrating through the wall surface of the piston cylinder (2) are formed in both ends of the piston cylinder spiral guide grooves (21), the through holes (23) are used for communicating the piston cylinder spiral guide grooves (21) with the corresponding piston cylinder ball grooves (22) in positions, a plurality of torque shaft ball grooves (51) are formed in the outer wall surface of the upper part of the ball outer cylinder (1), a plurality of ball screw guide grooves (21) are formed in the outer wall surface of the upper part of the piston outer wall of the ball outer cylinder (1), a plurality of ball pins (4) are arranged between the piston cylinder spiral guide grooves (21) and the ball grooves (22) and the inner wall surfaces of the ball outer cylinder (4), the limiting bolt (4) seals the steel ball (3) in the ball groove (22) of the piston cylinder.
  2. 2. The hydraulic back-off device torsion mechanism according to claim 1, wherein the number of the ball outer cylinder spiral guide groove (11), the piston cylinder spiral guide groove (21), the piston cylinder ball groove (22), the limit plug pin (4) and the torque shaft ball groove (51) is the same.
  3. 3. The torsion mechanism of a hydraulic back-off device according to claim 2, wherein the number of the spiral guide grooves (11) of the ball outer cylinder is 5, and the spiral guide grooves extend spirally along the inner wall surface of the ball outer cylinder (1).
  4. 4. The hydraulic back-off device torsion mechanism according to claim 3, wherein the number of the piston cylinder spiral guide groove (21) and the piston cylinder ball groove (22) is 5.
  5. 5. The hydraulic back-off device twisting mechanism according to claim 4, wherein the piston cylinder ball grooves (22) extend in the axial direction, the lower ends of the piston cylinder ball grooves extend to the lower end face of the piston cylinder (2), and two through holes (23) on each piston cylinder ball groove (22) are respectively formed in the upper end and the lower part of the piston cylinder ball groove (22).
  6. 6. The hydraulic back-off device torsion mechanism of claim 5, wherein the number of the limit bolts (4) is 5, the limit bolts (4) are integrally fan-shaped, the cross section of the limit bolts along the axial direction is L-shaped, the lower part of the rear end of the limit bolts (4) is provided with a bulge (41) which is matched with a torque shaft ball groove (51), and the front end surface of the limit bolts (4) is provided with a cambered surface groove (42) which is matched with the shape of the steel ball (3).
  7. 7. The hydraulic inverter torsion mechanism according to claim 6 wherein the number of the torque shaft ball grooves (51) is 5, and the upper ends thereof extend in the axial direction to the upper end surfaces of the ball torque shafts (5).
  8. 8. The hydraulic back-off device torsion mechanism according to claim 7, wherein the upper end of the ball outer cylinder (1) is connected with an upper pipe column.

Description

Torsion mechanism of hydraulic back-off device Technical Field The utility model relates to the field of oil and gas well drilling and repairing, in particular to a torsion mechanism of a hydraulic back-off device. Background In the later exploitation process of the oil-gas well, a production increase measure is required to be implemented, a pipe column is frequently blocked in the drilling repair operation/production increase measure process, the operation period and the cost are increased once the blocking accident occurs, and the well shaft is seriously scrapped. At present, common treatment measures for pipe column blocking include (1) reversing the blocked point position through a reversing drill rod, (2) cutting the blocked point position in a cutting mode, (3) blasting and releasing the blocking technology, (4) a planetary gear type mechanical reversing tool, and (5) a special hydraulic reversing tool for a highly-inclined well and a horizontal well. However, these techniques have significant limitations in practical operation. For example, the back-fastened drill rod well site is not reserved and needs to be prepared independently, so that the production cost and the transportation cost are high, and a large construction site is occupied. The torque is transmitted from a wellhead to a bottom of a well, the energy loss is large, the practical service life of a drill rod is reduced, a cutting mode is adopted to damage a tubular column, the operation process is complex due to the limitation of space and other problems, the explosion tripping tool solves some field problems to a certain extent, the tripping operation can be well completed in the primary tripping operation process, but the operation is very unfavorable in the secondary and tertiary follow-up tripping operation engineering, the planetary gear tripping tool has small size and lower strength due to the limitation of the tool size, and the output torque of the whole tool is small and cannot meet the tripping operation requirement of larger torque. Therefore, a hydraulic back-off tool is developed for the back-off operation of the highly deviated well and the horizontal well, and the hydraulic back-off tool consists of a hydraulic anchor and a back-off device. The upper hydraulic anchor is pressed, set and anchored on the sleeve, the reaction force of the back-off is provided for the lower back-off device, and the risk of rotary back-off of the pipe column at the upper end of the anchor is avoided. The lower hydraulic back-off device mainly comprises a pressurizing mechanism, a torsion mechanism and a power output mechanism, wherein the pressurizing mechanism is composed of an upper piston and a lower piston and provides axial driving force, the existing torsion mechanism adopts the relative motion of a left-handed spiral mandrel and a left-handed spiral spline sleeve to convert the axial force into left-handed torsion, the power output mechanism adopts an inner ratchet wheel and an outer ratchet wheel set design, the inner ratchet wheel and the outer ratchet wheel are mutually independent, the inner ratchet wheel is not influenced by lower rotation torque, and the outer ratchet wheel ensures that the generated back-off torque cannot rotate. The tool is safe and reliable to operate and has large output torque. However, these methods have a large limitation in the actual operation. And the feedback is carried out in the use process of the operation site, under the action of axial large torsion, the contact area of the spiral mandrel and the sawtooth threads of the spiral spline housing is overlarge, so that the contact stress in the movement is overlarge, and the risk that the spiral mandrel threads are adhered and cannot reset can occur in the repeated back-off operation. Disclosure of utility model Aiming at the risk that the screw spindle thread adhesion can not reset in the repeated back-off operation of the existing hydraulic back-off tool, the utility model provides the hydraulic back-off device torsion mechanism which converts the axial driving force into the rotating torque force, and reduces the contact stress on the premise of meeting the requirement of large torque output, so that the operation is safer and more reliable. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the utility model provides a hydraulic pressure back-off ware torsion mechanism, includes the ball urceolus, the interior piston tube of ball urceolus is equipped with, the interior ball torque shaft of ball barrel is equipped with, the lower extreme of ball torque shaft exposes from the lower extreme of ball urceolus, set up many ball urceolus spiral guide slots on the lower part internal wall of ball urceolus, set up many piston barrel spiral guide slots on the lower part external wall of piston barrel, set up many piston barrel ball grooves on the lower part internal wall of piston barrel, the through-hole tha