关键词: 弯曲井, 钻其组合, 有限元

Abstract: The wells are in the state of serious bending in building segment of horizontal or greatly inclined wells.The strict requirement of well path control needs doing a deep analysis of the deformation and stress for BHA.In the paper,according to theory of elastieity and energy principle,detailed theoretical analysis of finite element has been finished on geometrical nonlinear problem for BHA,and,a method of corresponding solution is presented.Using the result obtained above.linear and nonlinear analysis and their comparison have been done for effects of different inclination and azimuth curveture on bit side forces.Conclusian gotten may give a reference to personnel concerned.