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Oscillation mechanism of ground drive screw pump load torque
YANG Yong hua1,2, ZHENG Xue cheng3
(1.College of Petroleum Engineering in China University of Petroleum, Beijing 102249,China;2.Quality Management & Energy Conservation Department, Daqing Oilfield Limited Company, Daqing 163412, China;3.Oil Production Technology Institute, Daqing Oilfield Limited Company, Daqing 163453,China)
Abstract:
The ground drive screw pump systems used in deep wells and ASP flooding wells suffered from severe torque oscillation and resulted in the rod and pump stator earlier fatigues and lower running lives in Daqing Oilfield. A model of stick slip phenomenon of the pump system was developed and critical speed was derived. The precautions of the stick slip phenomenon and the trial results were also given.The results show that when the static friction coefficient of the metal rotor and rubber stator of a pump is greater than its dynamic sliding friction coefficient or the rate of the dynamic sliding friction coefficient change is negative, stick slip phenomenon may be induced in the screw pump system with the constant driving torque and rotation. The stick slip phenomenon of pump screw system has a large damage to on site equipment. It can be solved by reducing the critical stick slip speed.
Key words:  screw pump  torque oscillation  friction  stick slip  mechanism