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| Dynamics analysis on partial abrasion and fracture of driving rod in screw pump wells |
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WANG Wei-zhang1,YAN Xiang-zhen2,WANG Hai-wen3,ZHANG Xian-feng2
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(1. College of Mechanical and Electronic Engineering in China University of Petroleum; Dongying 257061，Shandong Province, China;2. College of Transport & Storage and Civil Engineering in China University of Petroleum, Dongying 257061,Shandong Province, China;3. College of Petroleum Engineering in China University of Petroleum， Dongying 257061，Shandong Province, China)
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| Abstract: |
| The deviation of tubing or oil rod was considered to be the main reason for the partial abrasion and fracture of driving rod, but the corresponding prevention method can't solve the partial abrasion and fracture problem radically. The dynamic factors of the driving rod were analyzed. The results show that the lateral vibration of driving rod is the principal reason of its partial abrasion and fatigue fracture. A lateral vibration model of driving rod was established and a method of calculating the critical rotate speed of the driving rod based on the lateral vibration frequency was proposed. Thus, the lateral vibration of driving rod can be controlled through controlling its rotate speed. Meanwhile, check calculation was performed based on the safety factor method, which provides a solution for the problem of partial abrasion and fracture of driving rod from the dynam- |
| Key words: screw pump well driving rod partial abrasion fatigue fracture lateral vibration |
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