Well drilling bypass circulation tool

Abstract

The invention discloses a well drilling bypass circulation tool which comprises an outer cylinder structure. A central tube structure is coaxially arranged in the outer cylinder structure in a sleeving manner, an axially connected central through hole allowing drilling fluids to pass is formed in the central tube structure, an outlet end of the central through hole is provided with a throttle nozzle which can be axially fixed, an outer fluid passage allowing the drilling fluids to flow from inside to outside is formed in the side wall of the outer cylinder structure close to an inlet end of the central through hole, and an inner fluid passage is arranged on the side wall of the central tube structure in a connected manner, can be communicated with the outer fluid passage in an abutted manner and can circumferentially rotate to be staggered from the outer fluid passage. The tool solves the problems that a cuttings bed affects drilling progress in the drilling process of a highly-deviated well or horizontal well, and safety is poor in the prior art. By the tool, the cuttings bed can be removed at any time in the drilling process, and safety and efficiency in the drilling process are improved.

Description

technical field [0001] The invention relates to the technical field of drilling equipment and tools in the petroleum industry, in particular to a drilling bypass circulation tool. Background technique [0002] During the drilling process of highly deviated wells or horizontal wells, affected by factors such as well deviation and annular return velocity, the cuttings in the annulus are easily deposited on the bottom edge of the well wall under the action of gravity to form a cuttings bed, especially when the pump is stopped. This phenomenon is especially evident when The well section with larger inclination angle is more likely to form cuttings bed. [0003] The cuttings bed can seriously affect the ROP. During the drilling of highly deviated wells or horizontal wells, it is easy to cause downhole decompression, resulting in no pressure on the drill bit, no footage for a long time, slow project progress, and increased drilling costs. At the same time, the cuttings bed can e...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a drilling bypass circulation tool, which overcomes the problems in the prior art that the cuttings bed affects the drilling process and poor safety during the drilling process of highly deviated wells or horizontal wells. Removal of cuttings beds to improve safety and efficiency of the drilling process

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