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 ...

AI Technical Summary

Problems solved by technology

[0003] When the drilling or workover string locker of the above two driving methods unlocks the slip structure, the drilling or workover string must be pulled to separate from the cone seat before the slips can be opened. For drilling or workover strings, it is very difficult to complete the slip unlocking operation

In addition, the existing drilling or workover string lockers can be divided into two types according to their functions: anti-drop lockers and anti-top lockers. Lock and fix it when the situation occurs, and the anti-top locker is used to lock and fix it when the drilling or workover pipe string is topped. Both types of lockers have the defect of single function

At the same time, the existing locking devices for drilling or workover strings still have deficiencies in the following aspects: one is that the lockers rely on the friction generated between the drilling or workover strings and the slips to send the slips into the cone seat If the slips hold the drilling or workover string tightly and lock it, when the friction force between the drilling or workover string and the slips is not enough to send the slips into the cone seat, it is very easy to cause flying pipe damage People or pipe string fall accidents; second, the existing drilling or workover pipe string locker slips are mostly two-half structure, and different types of slips are required for drilling pipe strings of different diameters, and the universal performance is poor The third is that the existing drilling or workover string locker does not have the function of rotation and is not suitable for rotary drilling and workover operations under pressure

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