随钻易冲蚀部件定子转子流场分析

Flow field analysis on the erosion prone parts of the drilling equipment-stator and rotor

针对随钻仪器受钻井液冲蚀后造成钻井系统性能不稳定、寿命短的问题,研究了冲蚀与磨损机理.通过有限元方法,计算出易冲蚀部件定子和转子的流场分布、表面压力及钻井液流动速度.结果表明:钻井液对部件冲蚀严重的位置在壁面曲线曲率突然改变的地方及应力场变化率较大的地方,为随钻仪器设计、优化、修复提供理论依据.

The erosion and wear mechanism for drilling equipment is studied in this paper, which is for the problem of unstable performance of drilling system and short lifetime caused by the erosion of drilling equipment by drilling fluid. The flow field, surface pressure of the erosion prone parts stator and rotor and drilling fluid flow rate are calculated by the finite element method. The results demon- strate the parts eroded seriously by drilling fluid appear in where the curvature of the curve of the wall changes suddenly and where the rate of change in the stress field is greater, which provide a theoretical basis on design, optimization and repair of drilling equipment.