Annular drill pipe power tong

Abstract

The invention provides an annular drill pipe power tong. The annular drill pipe power tong comprises a base and a clamping mechanism; the base comprises a central through hole; the clamping mechanism comprises a driving assembly, a gland assembly that can be driven by the driving assembly to move in an axial direction of the central through hole, a plurality of power tong slips distributed in a circumferential direction of the central through hole, and a connecting rod, wherein one end of the connecting rod is hinged to the gland assembly, while the other end of the connecting rod is hinged to the power tong slips; when the driving assembly drives the gland assembly to move in the axial direction of the central through hole, the gland assembly is capable of driving the power tong slips to close in or expand in a radial direction of the central through hole through the connecting rod. The annular drill pipe power tong is capable of clamping a drill pipe in a continuously circular drilling process, and providing enough clamping force to the drill pipe to ensure no relative sliding between the annular drill pipe power tong, the drill pipe and the clamping mechanism after the drill pipe is clamped and to guarantee that an indentation of the drill pipe is as small as possible.

Description

technical field [0001] The invention relates to the field of drilling equipment in the petroleum industry, in particular to an annular drill pipe power tong. Background technique [0002] Continuous circulation drilling achieves stable equivalent circulation density and uninterrupted cuttings discharge during the entire drilling period, which improves wellbore conditions and drilling safety in an all-round way. This technology is especially suitable for safe drilling under the condition of narrow drilling fluid density window. In addition, in extended-reach wells, horizontal wells, high-pressure / high-temperature wells, and underbalanced wells, this technology can ensure that the well wall does not collapse to the greatest extent, avoid stuck pipe, reduce drilling accidents, and increase the ROP. [0003] The power tongs in the prior art are the key components of the main engine of the continuous circulation drilling device. They are mainly composed of four parts: the base, ...

AI Technical Summary

Problems solved by technology

Therefore, the power tongs used for continuous circulation drilling must be able to provide sufficient clamping force to ensure that after the power tong slips clamp the drill pipe, there will be no relative sliding between the power tong slips and the drill pipe, and ensure the indentation of the drill pipe As small as possible, the power tongs in the prior art cannot guarantee that the power tongs can reliably and safely clamp the drill pipe body to realize the functions of turning buckle and make-up and breakout

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