A hydraulic rotary drilling or workover pipe string two-way locking device

Abstract

The invention provides a hydraulic rotary drilling or repairing tubular column two-way locking device and belongs to the technical field of drilling equipment. The hydraulic rotary drilling or repairing tubular column two-way locking device comprises an upper shell, a lower shell and a locking device core. The upper shell and the lower shell are assembled through a bolt assembly. The locking device core is arranged in a cavity defined by the upper shell and the lower shell. A slip fixed seat, slips, slip sliding seats, radial driving oil cylinders and slip locking sleeves are arranged in the locking device core, wherein the slips, the slip sliding seats, the radial driving oil cylinders and the slip locking sleeves are symmetrically arranged at the upper end and the lower end of the slip fixed seat. The slips are embedded into the inner side walls of the slip sliding seats, pistons of the radial driving oil cylinders and the slip sliding seats are assembled in a screwed mode, the inner walls of the slip locking sleeves are of a conical surface structure, a set of axial locking double-acting oil cylinders are evenly arranged between the upper slip sleeve and the lower slip sleeve in the circumferential direction, and the upper slip sleeve and the lower slip sleeve are connected with piston rods of the axial locking double-acting oil cylinders respectively. A drilling tubular column can be automatically locked and unlocked, and anti-ejecting and anti-falling two-way locking functions are achieved.

Description

technical field

[0001] The invention relates to a locking device for drilling or workover pipe strings, in particular to a hydraulic rotary locker suitable for holding and locking the drilling or workover pipe strings when they go up and down. Drilling equipment technical field. Background technique

[0002] At present, most of the pipe string lockers used in oil drilling, pipe pulling and casing removal, conventional and hot workover operations use slip locking structures, and can be divided into manual mechanical lockers and pneumatic, hydraulic lockers according to their driving methods. Dynamic lock. Among them, the manual mechanical lock requires that the slip diameter is slightly smaller than the diameter of the drilling or workover string, and the gap between the slips and the drilling or workover string is very small when the slips are opened. When jacking up or falling, the friction generated between the drilling or workover string and the slips will quickly send ...

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