A New Type of Well Inflow Performance Relationship of Low Permeable Oil Field and Its Application in Optimizing the Suction Parameters of Rod Pumping System

In China's oil fields,the numbers of oil wells of low liquid output and low permeability are increasing year by year,but the behaviors of the well inflow performance relationship of low permeability oilfield are not researched perfectly or are not paid attention to in designing the pumping parameters.In the paper,a new type of well inflow performance relationship is setup.The relationship equation that is used to distinguish whether or not the inflow performance relationship is of inflection point is established,and the formula of calculating the reasonably flowing pressure at which the liquid output can get the maximal value is setup.When the new inflow performance relationship is used to direct the design of suction parameters of rod pumping wells,the oil wells can run at the reasonably flowing pressure and the maximal liquid output,which is of important significance to raise economic effects of low permeability oil field.