Continuous cyclic drilling device

Abstract

The invention discloses a continuous cyclic drilling device used in the technical field of petroleum drilling. A drill pipe power tong is fixed on a power tong baseplate on the top of a balance compensation hydraulic cylinder, the balance compensation hydraulic cylinder is vertically fixed below the upper connection board of a support assembly, the piston rod of the balance compensation hydrauliccylinder passes through the upper connection board, and the top of the piston rod of the balance compensation hydraulic cylinder is fixedly provided with the power tong baseplate. A cavity assembly is fixed between the upper connection board and the lower connection board of the support assembly, the lower end of a drilling power slip is fixed in the bushing of a drilling turntable, the upper endof the drilling power slip is connected with the support assembly through a bearing beam, and the centers of the drill pipe power tong, the cavity assembly and the drilling power slip are coincident.The device has the effects of keeping the continuous cycling of the drilling fluid to discharge the drilling cuttings during the period of making a connection, avoiding the damage to the drill pipe caused by the up tong when screwing on and screwing off, eliminating the adverse effect of the slip holding capacity caused by the upset force of the drilling fluid, and improving the stress state between the slip and the drill string.

Description

technical field [0001] The invention relates to the field of drilling equipment in the petroleum industry, in particular to a drilling device for maintaining uninterrupted circulation of drilling fluid during the connection of a single drill pipe. Background technique [0002] At present, in conventional drilling operations, before a single drill pipe is connected, the drilling fluid pump must be turned off first to stop the drilling fluid circulation. When the drilling fluid circulation stops, the negative excitation pressure and cuttings settlement at the bottom of the well can easily lead to accidents such as well kick, gas invasion, well wall collapse and drill sticking; Drilling fluid circulation, at this time, the positive excitation pressure at the bottom of the well may exceed the formation fracture pressure, resulting in drilling fluid loss. Therefore, the conventional drilling fluid circulation method cannot meet the drilling requirements of complex formations suc...

AI Technical Summary

Problems solved by technology

[0005] During the making-up and breaking-out operation of the drill pipe with the main engine, the drilling power slips stuck on the drill pipe body not only have to bear the weight of the entire drill string, but also provide make-up and break-out reaction torque as a back tong, resulting in damage to the drill pipe. Rod body, may even cause serious accidents such as drill pipe breakage during drilling

In addition, due to the upward force of the drilling fluid generated during the make-up and breakout process on the drill pipe power tongs of the main engine, the main engine is subjected to an upward force, causing the drilling power slips to move upward, making it clamp the drill pipe The reduced holding force may cause the slips to slip during make-up and breakout, and the make-up cannot be undone, and even the accident of the drill string sliding down

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