Drag-reducing and torque-reducing device

Abstract

A drag-reducing and torque-reducing device for a pipe string comprises a body, a sliding sleeve, cylindrical rollers, a threaded locking ring, a tightening screw, metal abrasion-proof gaskets and seal rings, wherein four spiral ridges are longitudinally and uniformly distributed on the outer surface of the sliding sleeve in the circumferential direction; the outer contour of a cross section of the sliding sleeve is elliptical; four circles of roller grooves are formed in the surface of the body in the circumferential direction, are fully filled with the rollers, and are matched with the sliding sleeve; the sliding sleeve sleeves the body; the seal rings are arranged at two ends of the part, connected with the body, of the sliding sleeve; the sliding sleeve is limited by a shoulder at the male buckle end of the body and the threaded locking ring mounted at the female buckle end of the body; the threaded locking ring is fastened with the tightening screw; the metal abrasion-proof gaskets are arranged between the sliding sleeve, and the body and the threaded locking ring. The drag-reducing and torque-reducing device has the advantages that the structural reliability is high; loss in a drilling torque transmission process can be reduced; abrasion on the pipe string is reduced; vortex motion of the pipe string can be reduced to a certain extent; the work efficiency is further improved.

Description

technical field [0001] The invention belongs to the field of machinery, in particular to a drilling tool. Background technique [0002] In the development of oil and gas fields, with the advancement of drilling technology, the wellbore structure is becoming more and more complex. During drilling and casing running and other pipe string running operations, the pipe string will bear greater frictional resistance, so that: (1) lifting When the pipe string is lowered, the resistance is large, and the drill pressure transmission is difficult during the drilling process; (2) the friction torque of the drill string is large, the ROP is reduced, and the torque transmission is difficult; (3) the excessive torque will cause the pipe string to break; (4) the drill pipe and The casing wears seriously, which brings heavy losses to the oil field. [0003] Therefore, it is of great significance to study a tool that can reduce frictional resistance and torque. Contents of the invention ...

AI Technical Summary

Problems solved by technology

[0002] In the development of oil and gas fields, with the advancement of drilling technology, the wellbore structure is becoming more and more complex. During drilling and casing running and other pipe string running operations, the pipe string will bear greater frictional resistance, so that: (1) lifting When the pipe string is lowered, the resistance is large, and the drilling pressure is difficult to transmit during the drilling process; (2) the friction torque of the drill string is large, which reduces the ROP and the torque transmission is difficult; (3) the excessive torque will cause the pipe string to break; (4) the drill pipe and Casing wear is serious, causing heavy losses to the oil field

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