This paper makes a calculation of bit side force to the flexible pendulum stem and pendulum stem on the basis of vertial and horizontal bending theory, which, theoretically, shows that flexible pendulum stem has a better inclination correction effect than pendulum stem.

This paper makes a calculation of bit side force to the flexible pendulum stem and pendulum stem on the basis of vertial and horizontal bending theory, which, theoretically, shows that flexible pendulum stem has a better inclination correction effect than pendulum stem.

Experimental study on longitudinal vibration characteristics of pendulum assembly in straight hole;

According to hole straightening technique in drilling straight wells and sidetracking technique in drilling directional well,this paper proposes 3 lateral drilling methods in open holes,which are sidetracking by pendulum assembly,sidetracking by milling fish and sidetracking by downhole assembly.

Pendulum assembly is a kind of BHA for hole straightening, which is applied widely in drilling practice.

5mm well as example to study the design approach of inverted pendulum drill assembly and provide the basis for Inverted pendulum drill assembly optimized design.

It was hard to control well path while drilling by using conventional pendulum assembly with single stabilizer.