Oriented rotational guide drilling tool

Abstract

The present invention relates to an oriented rotational guide drilling tool which comprises a hollow housing with two through ends. The housing is communicated with a hollow drill collar through an upper female buckle. The lower end of the housing is inserted with a hollow mandrel. The cup-shaped port on the upper end of the hollow mandrel clings to the inner wall of the housing. The upper outer wall of the mandrel which clings to the cup-shaped port is sequentially sleeved and fixed with an upper floating sealing assembly and an upper floating bearing for supporting the mandrel from up to bottom. The mandrel penetrates an eccentric mechanism which is installed and fixed on the inner wall of the housing. The lower end of the mandrel extends out from the housing and is sequentially connected with a hollow rotating head and a drill. The outer wall which is in the lower chamber of the casing and clings to the mandrel is sequentially sleeved with a lower sealing assembly and a lower fixing bearing from up to bottom. The lower sealing assembly and the lower fixing bearing are fixedly connected with the inner wall and the mandrel of the housing. The oriented rotational guide drilling tool of the invention not only has high control precision, but also has a simple structure and therefore can be widely applied for various strata with different mechanic characteristics of surface.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a pointing rotary steerable drilling tool. Background technique [0002] Controlling the wellbore trajectory refers to guiding the wellbore so that the inclination and azimuth of the wellbore are operated according to the pre-designed inclination and azimuth to achieve the pre-designed goal. At present, there is a Chinese patent, and the application number is 200720021462.7 "Sliding Push-to-Push Steering Drilling Tool", which has realized the control of the wellbore trajectory, but the structure of this drilling tool is complicated, and the control accuracy is not high. More importantly, the drilling tool It also depends on the softness of the formation. Other conventional rotary steerable drilling tools also mainly rely on the surface mechanical properties of the formation, which greatly limits the possibility to control the wellbore trajectory. Contents of the invention [0003] In view o...

AI Technical Summary

Problems solved by technology

At present, there is a Chinese patent, and the application number is 200720021462.7 "Sliding Push-to-Push Steering Drilling Tool", which has realized the control of the wellbore trajectory, but the structure of this drilling tool is complicated, and the control accuracy is not high. More importantly, the drilling tool Also depends on the softness of the formation

Other conventional rotary steerable drilling tools also mainly rely on the surface mechanical properties of the formation, which greatly limits the possibility to control the trajectory of the wellbore

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