Analysis on the sensitivity of the system efficiency of pumping well and its application

The conventional optimum design method of pumping units,which aims to increase wellhead yield,does not meet the production requirement of high water cut oil wells.Therefore,this paper analyzes the sensitivity of the system efficiency of pumping wells,finds out the most import parameter that affects the system efficiency and improves.As a result,the system efficiency of pumping wells is improved.The main methods employed in this paper include that:the summing up and sensitivity analysis of the 13 factors that affect one pumping well from the perspectives of analyzing ground surface and underground conditions,the utilization of the principles of system engineering and technical economics,the establishment of a sensitivity analysis model consisting of 15 parameters,and the building of internet-based system optimization design software aiming at the coordination and unification between output,efficiency,and lifespan.The new methods have been applied in about 5000 wells of 12 oilfields,such as PetroChina Daqing and Huabei Oilfields.The application results show that the system efficiency of improved individual wells increases by 6% on average,as well as the remarkable results are obtained in technical energy saving and oil production increment.