Abstract: Artificial lift oil production is required in the middle and late development of offshore oil and gas production platforms,most of which take electric submersible pump for oil production as the main implementation scheme. However,in daily maintenance,it is found that some electric submersible pumps frequently have huge current fluctuations,resulting in high-frequency pump shutdown,accompanied by the regular change of bottomhole flowing pressure,which seriously damages the service life of electric submersible pumps and threatens the stable production of the platform. By analyzing the bottomhole flowing pressure,dynamic liquid level,well history and various parameters of the electric submersible pump,it is finally determined that the actual lift under the current power of the electric submersible pump can not meet the lifting requirements. By increasing the frequency of the electric submersible pump,the problem of excessive current fluctuation and frequent pump shutdown is solved.

Key words: electric submersible pump, lift, bottomhole flowing pressure, dynamic liquid level