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NEW KNOWLEDGE ABOUT PRODUCTION PROFILE MODEL OF HIGH WATER CUT OIL RESERVOIR AND MEASURING METHOD

The residual oil saturation in oil payzone at late period of high water cut stage should distribute randomly, and the migration of flowing fluid in wells completely accords with the random process model. Some totally new conclusions can be got after the description and analysis to the model based on probability theory and random process theory. Due to the discrete randomness of the residual oil saturation parameter the situation of P(y i=c) =1 cannot exit. Based on experimental observation and strict mathematical theory demonstration this paper doubts the conventional method to extract water cut of high water cut oil reservoir and the measuring results. The expression should be used to extract the mean value of random variables, and according to "big sample principle" the value of n should be taken as big as possible; The water cut of flowing fluids in wells is randomly constant and its mathematical expectation is the water cut of oil payzone. Therefore, the method of fixed time continuous accumulation to extract the mean value is applied.