Automatic reactive torque balancing device for screw drill, drilling pipe string and method

Abstract

The invention provides an automatic reactive torque balancing device for a screw drill, a drilling pipe string and a method. The device comprises an upper joint, a core tube, a lower joint and an automatic balancing component, wherein an inner cavity of the core tube communicates with the downstream screw drill, so that the drilling fluid from the inner cavity of the upper joint can flow to the screw drill through the inner cavity of the core tube in order to enable the screw drill to drill; the lower joint is fixedly arranged at the lower end of the core tube; the automatic balancing assemblyis arranged between the outer wall of the core tube and the inner wall of the upper joint, and the automatic balancing component is driven by the liquid pressure generated by a part of the drilling fluid flowing into the inner cavity of the upper joint, wherein when the displacement of the drilling fluid is equal to a first predetermined value, the friction torque generated between the upper joint and the core tube is equal to the reactive torque generated on a shell of the screw drill for directional drilling; and when the displacement of the drilling fluid is higher than the first preset value, the friction torque generated between the upper joint and the core tube is larger than the reactive torque generated on the shell of the screw drill, so that the core tube drives the shell of thescrew drill to rotate for composite drilling.

Description

technical field [0001] The invention relates to the technical field of oil and gas well construction, in particular to an anti-torque automatic balancing device for a screw drilling tool, a drilling string containing the same and a drilling method using the drilling string. Background technique [0002] At present, directional wells and horizontal wells mainly use screw drilling tools for wellbore trajectory control. During the working process, when sliding drilling, the drill string does not rotate to ensure the stability of the tool face of the screw drilling tool, but this will cause a large axial friction between the drill string and the well wall, especially for horizontal wells with long horizontal sections and In extended-reach wells, huge axial friction will lead to poor transmission of drilling pressure and low ROP. [0003] In order to solve the shortcoming of low ROP during sliding directional drilling of screw drilling tools, various technologies have been devel...

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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