Pointing Rotary Steering Drilling Tools

Abstract

The invention discloses a directional rotating guide drilling tool. The directional rotating guide drilling tool comprises an outer barrel upper section and an outer barrel, wherein a drill stem and a mandrel are sequentially connected to the outer barrel upper section and the outer barrel from the top to the bottom, the drill stem is connected with the mandrel through a hollow cardan joint, the drill stem is in rotating connection with the outer barrel upper section through a cylindrical roller bearing, a pressure relief cavity positioned in the outer barrel is arranged at the lower end part of the drill stem, the pressure relief cavity is communicated with a draining hole in the drill stem, a biasing mechanism and a knuckle bearing assembly which are positioned in the outer barrel are respectively arranged at the upper end part and the middle of the mandrel, the pressure relief cavity is communicated with the biasing mechanism through a guide pipe, and a drill bit is fixedly connected to the lower end of the mandrel. The biasing of the mandrel is realized by an integrated hydraulic cylinder. The use of the tool is not affected by geological stratification, so that stable and higher drift angle buildup can be obtained. Various work states can be realized without lifting the drill.

Description

technical field [0001] The invention relates to a drilling tool in the field of oil, natural gas and other drilling, in particular to a pointing rotary steerable drilling tool. Background technique [0002] At present, drilling technology has been developed in the direction of ultra-deep wells, extended-reach wells and directional wells. Traditional sliding drilling tools can no longer meet the current drilling needs. Rotary steerable drilling technology has gradually been applied and developed as a high-tech drilling technology. [0003] Rotary steerable tools currently on the market mainly include Schlumberger's PowerDrive, Baker Hughes' AutoTrack and Halliburton's Geo-Pilot. The first two belong to the push-by rotary steerable drilling tools, and the characteristic of these two drilling tools is that they can obtain a large bias force at the drill bit. However, due to different geological conditions and changes in drilling fluid pressure, the build-up rate of tools will ...

AI Technical Summary

Problems solved by technology

However, due to different geological conditions and changes in drilling fluid pressure, the build-up rate of tools will be affected, resulting in unsmooth wellbore trajectory, poor wellbore quality and wellbore conditions, and downhole accidents are prone to occur

[0004] Halliburton's Geo-Pilot system is a pointing rotary steerable drilling tool. It uses the control of the drill string bending characteristics to achieve effective guidance and control of the drill bit axis. The effect is obvious in soft and heterogeneous formations, but the core bearing is subjected to high-intensity alternating stress, and the mandrel is prone to fatigue damage, which affects the tool life

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