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Study on improving efficiency of sucker-rod pumping system

ZHENG Hai-jin DENG Ji-bin TANG Dong-yue YUAN Lin CHEN Yan (Reida Petroleum Engineering Company of Jiangsu Oil Field,Yangzhou 225009,China)  
The input power of a sucker-rod pumping system was divided into hydraulic horsepower,surface mechanical loss power,down-hole viscous friction loss power,down-hole sliding friction loss power and solution gas expanding power.The influencing factors for each power were determined,and their functional relations were derived.In order to calculate the input power corresponding with different geophysical parameters and liquid properties,different borehole deviations,and parameters of different production and different devices,some mathematical formulas were developed.According to these formulas,a new design method for choosing combination of the production parameters with the parameters of devices was proposed,on the principle of the least energy consumption or the least cost.The new method can be used to determine the most economic combination of parameters for production and devices,and the efficiency of the suck-rod pumping system can be improved greatly.Accordingly,an economical goal for oil production can be achieved.
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