Rotary steering tool for well drilling

Abstract

The invention discloses a rotary steering tool for well drilling. The rotary steering tool for well drilling comprises a pair of hollow joints arranged up and down and in butt joint, wherein each hollow joint is provided with a threaded head section and a light pipe section which are of an integral structure, the threaded head sections of the upper hollow joint and the lower hollow joint are oppositely arranged, the light pipe sections of the upper hollow joint and the lower hollow joint are each provided with a rolling bearing, an outer sleeve is arranged on the periphery of each rolling bearing, and the outer sleeves are supported on the rolling bearings; three hollow windows arranged in the circumferential direction are formed in each outer sleeve, wherein each hollow window is providedwith a supporting block, each supporting block is provided with a hydraulic cylinder, and the hydraulic cylinders drive the supporting blocks to stretch out along the hollow windows and abut againstthe well wall with mud pressure difference between the interior and the exterior of a drill column as power; when no pressure difference exists between the inner mud and the outer mud of the drill column, reset springs of the hydraulic cylinders enable the supporting block to retract; and a mud channel is formed in the connecting portion of the upper hollow joint and the lower hollow joint, so that mud in the tool enters the hydraulic cylinder, and pistons can be driven to push the supporting blocks to stretch out; one hydraulic cylinder of one supporting block is further provided with a reversing valve which is used for enabling the hydraulic cylinder of the supporting block to communicate with the mud in the drill column or the mud outside the drill column. According to the rotary steering tool for well drilling, a stable inclined drilling working mode, a rotary steering working mode, a full-closed tripping working mode and a tripping working mode can be selectively realized.

Description

technical field [0001] The invention belongs to the field of oil drilling and production tools, and relates to a rotary steering tool for drilling. Background technique [0002] The rotary steerable drilling system is an advanced trajectory control system for directional wells and horizontal wells developed abroad in the last century. ) an indispensable base platform. Since the beginning of this century, various domestic oil fields and institutes have carried out a lot of research and development on rotary steerable systems, and achieved a series of results. Expensive, and no official product has been put into commercial application. [0003] Steering drilling is realized mainly by steering tools, which are divided into two categories: [0004] 1. Sliding guide tool [0005] The characteristic of the sliding steering tool is that the drill string does not rotate during the steering operation, and the drill string is pushed forward with the drill bit and slides along the ...

AI Technical Summary

Problems solved by technology

Sliding steering has many disadvantages: the torque and friction of the drill string are large; the wellbore cleaning is not thorough; the ROP is slow, etc., but it still dominates

[0010] At present, the rotary steerable tools used in my country's shale gas market are basically monopolized by a few foreign companies such as Schlumberger, Baker Hughes, and Halliburton. The tools have excellent performance and a high degree of automation, but the structure is very complicated and the price is very high. expensive

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