Abstract: Based on the analysis of dynamics behavior of sucker rod pumping system,the model for fault diagnosis of sucker rod pumping system in directional and straight wells in consideration of flexibility of hanging system is established.A method to diagnose the fault of sucker rod pumping system based on B/S Mode is studied.Fault diagnosis system of sucker rod pumps which is based on B/S mode software by using Internet and Web technology is developed.The diagnosis system can diagnose fault of sucker rod pumping system by browsing swiftly and accurately.And then the paper gives an calculation example,the result proves the validity of this system.The fault diagnosis based on B/S mode has great significance for preventing blindness of underground operation,improving the system efficiency,reducing the oil production cost and raising scientific management level of oil well.Meanwhile,it improves enterprise′s information based degree of oil field,lays the foundations of realizing Digital Oil Field.

Key words: sucker rod pumping system, dynamics analysis, modeling, B/S mode, fault diagnosis