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According to the problem of screw fracture of electric submersible pump unit in Shengtuo oilfield, the reasons for the screw fracture are analyzed from three aspects: material, strength and pretightening force. The preliminary result shows that the imbalanced pretightening force of screw is the main reason of screw fracture. By means of Ansys software, the static and modal analyses for the electric submersible pump adapter are conducted respectively in condition of the consistent and inconsistent pretightening forces. The numerical simulation results show that when the pretightening force is inconsistent, the sharp increase of maximum stress of the screw accelerates the screw fracture, and the dynamic performance of screw in the vicinity of 3809.7Hz is the worst. Based on it, the special torque wrench is developed and then the pretightening quality of screw is improved greatly by using this wrench.

Research on Fracture Mechanism and Improvement Methods of Electric Submersible Pump Unit’s Joint Screw