Hydraulic power slip of removable oil string

Abstract

A hydraulic power slip of a removable oil string comprises two anti-twist slip recesses (1), anti-twist slip bodies (2), a hydraulic cylinder (3), a hydraulic control system (4), anti-twist slip inserts (5), a supporting plate (6), a guide rod (7), a righting ring (8) and the like. The two anti-twist slip recesses (1) can be freely opened and closed, the anti-twist slip recesses and a turntable large square slip can be exchanged, the split anti-twist slip bodies (2) contact with the anti-twist slip recesses (1) through inner side faces, can vertically slide and are provided with circumferential anti-twist grooves, the anti-twist slip inserts (5) are mounted on the anti-twist slip bodies (2) and can clamp different sizes of oil strings, the hydraulic cylinder (3) is mounted on one anti-twist slip recess (1) and connected with the hydraulic control system (4), a piston rod of the hydraulic cylinder (3) and the guide rod (7) are simultaneously fixed on the supporting plate (6), and the righting ring (8) is mounted at the centers of the anti-twist slip recesses (1).

Description

technical field [0001] The invention relates to a wellhead hydraulic power tool that automatically holds and fixes drill pipes, drill collars or casings and prevents pipe strings from twisting during oil and natural gas drilling. 1. A hydraulic power slip for detachable oil pipe string. Background technique [0002] In the process of drilling and tripping in oil and natural gas wells, the double-elevator operation or single-elevator plus manual slip operation can no longer meet the requirements of modern drilling construction for high efficiency, safety, and environmental protection. Rod pneumatic slips, multi-functional pipe and rod pneumatic slips and drill collars, casing pneumatic slips, etc. have greatly improved the operational safety performance of the wellhead, reduced labor intensity of workers and improved the work efficiency of drilling and running in, but the pneumatic slips It cannot meet the requirements of preventing torsion of the oil pipe string when the pi...

AI Technical Summary

Problems solved by technology

[0002] In the process of drilling and tripping in oil and natural gas wells, the double-elevator operation or single-elevator plus manual slip operation can no longer meet the requirements of modern drilling construction for high efficiency, safety, and environmental protection. Rod pneumatic slips, multi-functional pipe and rod pneumatic slips and drill collars, casing pneumatic slips, etc. have greatly improved the operational safety performance of the wellhead, reduced labor intensity of workers and improved the work efficiency of drilling and running in, but the pneumatic slips It cannot meet the requirements of preventing torsion of the oil pipe string when the pipe string is directly disassembled, nor can it realize the different clamping force requirements when the pipe string is clamped and released, and there are problems such as unstable movement and noise; on the other hand , in order to meet the needs of drilling rig relocation and installation, the number of modern portable drilling rigs is increasing. Drill floor equipment configuration, such as removing heavy drilling string power tongs, iron drillers and other wellhead equipment, while realizing remote automatic control of drilling rigs, improving the level of automatic control of drilling rigs

[0003] Chinese patent: multi-functional rod and pipe pneumatic slips (CN201020519940.9) and Chinese patent: multi-functional drilling string pneumatic slips (CN201120039748.4) are the power slips that use the cylinder as the power to clamp the oil pipe string. The air source pressure is low, when the slip body is driven up and down, it mainly realizes the load-bearing effect on the pipe string and cannot fully realize the anti-twist function on the pipe string

Another example is the Chinese patent: multifunctional hydraulic power slips (201220149452.2) use two-stage hydraulic cylinders to drive the slip body up and down to clamp the oil pipe string, which has a certain anti-twist ability, but when the well depth is shallow Ordinary hydraulic clamping force is not large enough to realize the function of directly dismantling the oil pipe string by using the top drive device

Another example is the Chinese patent: the ram-type two-way self-tightening sealing slip (CN201320238790.8) adopts a hydraulic cylinder and a hydraulic control system to drive the slips to bidirectionally clamp or loosen the oil pipe, and is mainly used as a complete set for the snubbing operation equipment of oil and water wells in oil fields. It can hold the oil pipe and does not have the anti-twist function, neither can meet the requirements of the top drive drilling rig to clamp the pipe string and directly disassemble the buckle

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