Anti-torque automatic balancing device, drilling string and method for screw drilling tools

Abstract

The present invention proposes a kind of anti-twist automatic balance, drilling pipe string and method for screw drilling tools. The device includes an upper sub; The drilling fluid in the inner cavity can flow to the screw drilling tool through the inner cavity of the core barrel to make the screw drilling tool drill; the lower joint fixed at the lower end of the core barrel; the lower joint arranged between the outer wall of the core barrel and the inner wall of the upper joint an automatic balancing assembly driven by hydraulic pressure generated by a portion of the drilling fluid flowing through the inner cavity of the upper sub, wherein friction occurs between the upper sub and the core barrel when the displacement of the drilling fluid is equal to a first predetermined value The torque is equal to the reaction torque generated on the casing of the screw drilling tool for directional drilling. When the drilling fluid displacement is higher than the first predetermined value, the friction torque generated between the upper joint and the core barrel is greater than that on the casing of the screw drilling tool. The generated reaction torque makes the core barrel drive the casing of the screw drilling tool to rotate for compound drilling.

Description

Technical field [0001] The present invention relates to the field of oil and gas well construction, and more particularly to a counter torque automatic balancing device for screw drilling, a drilling tube string including it, and a method of drilling using the drilling tube string. Background technique [0002] At present, the direction of the well and the horizontal well mainly use the screw drill to perform well trajectory control. During the working process, when the drilling is slid, the drill string does not rotate to ensure the stability of the screw drill tool surface, but this will result in a large axial glass of the drill string and the well wall, especially for the length of the long-segment segment and Large axial shifting, huge axial rubbers caused the drilling transfer and low mechanical drilling. [0003] In order to solve the shortcomings of the mechanical drilling speed when the screw drill sliding, various technologies have been developed at home and abroad, and...

AI Technical Summary

Problems solved by technology

However, since the rotary steerable tool is an electromechanical-hydraulic integrated device, the use and maintenance costs are expensive, which is not conducive to the reduction of drilling costs

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