含水与沉没度对杆管偏磨的影响研究

通过对抽油机井最小载荷随含水和沉没度变化规律及杆管摩擦磨损规律的实验研究，找出了含水、沉没度对杆管偏磨的影响规律。高含水抽油机井在低沉没度条件下运行时，抽油泵因严重供液不足而产生液击，会加剧抽油杆柱振动，降低抽油机悬点最小载荷，从而减少抽油杆柱的轴向分布力与杆管产生偏磨的临界轴向压力，加大了下冲程时抽油杆柱下部受压段的长度，容易造成抽油杆柱屈曲而导致杆管偏磨。高含水是导致杆管偏磨速度加快的主要原因。

Effect of Water Cut and Submergence Depth on Eccentric Wear of Rods and Tubing

According to the research on the changing rules of the minimum load for the rod pumped wells with the change of water cut and submergence depth and the rubbing wear rules for the rods and tubing,the effect of water cut and submergence depth on the eccentric wear of rods and tubing has been understood.When the high water cut rod pumped wells run under low submergence depth,the liquids supply of the rod pumped wells is seriously non-sufficient,which results in liquids heat.This kind of heat will enhance the shake of rod string,decrease the minimum polished rod load of the rod pumped wells,and decrease the critical axial pressure which is resulted from the eccentric wear between the axial force of the rod string and rod and tubing,and then will increase the compression depth at the lower part of the rod string during down stroke.Finally,the rod string will be buckled easily to result in the eccentric wear of rods and tubing.High water cut is one main reason for the speeding up of the eccentric wear of rods and tubing.