Determining method for resonable drawdown pressure of oil reservoir with edge and bottom water

The study on the critical oil output and oil recovery with no water in the oil reservoir with edge and bottom water is more embedded at present,but the study on the optimization of drawdown pressure of oil well after produced water is not enough.So,a new method for determining the drawdown pressure of oil well with different water_cut sections is presented.A whole oil reservoir is treated as the studied object on the basis of the systematic well test.According to the raising feature of containing water in oil well,the water cut is subdivided into several sections.The correction between increasing rates of containing water and the drawdown pressure in the different water_cut sections was studied.This method is on lots of production data and has a good maneuverability.An effective application of the method can dig the potentiality of oil reservoir during medium high water cut period and may enhance the oil recovery.A favorable effect of application in the CB,ZS and YA oil reservoirs with edge and bottom water has been obtained.