关键词: 钻具, 钻具组合, 井况, 动态分析, 钻柱力学

Abstract: In this paper tri dimensional straight beam elements are used to discretize a bottom-hole drilling assembly and a numerical model is presented to simulate the transient dynamic behavior of the bottom-hole assembly during drilling. Bit weight, rotary speed, friction and hole curvature etc. are considered in the development of the dynamic differential equations and wilson numerical integration is used for solving them. The contact of the drill pipe with the wall is modeled by instantaneous shocks of pipe on the wall. A new method is used to determine the instant of contact.The results of dynamic analysis are discussed. The time averages of inclination forces and azimuth forces are used to predict the motion tendencies of BHA, and they are identical with the results of static analysis. The dynamic analysis and computer program given in this paper can be used for directional drilling.