Extension of Characterization Method of Concave-S Shape Water Cut Rising Law in Water Flooding Oilfield
Aimed at the issue that the concave-S-shaped water cut rising law of water flooding oilfield is difficult to diagnose and the fitting effect is unsatisfactory,considering the circumstance that the S-shaped water cut rising curve deviates from the straight line in the high water cut stage,and the concave water cut rising curve strengthens or weakens the S-shaped water cut rising curve,the quadratic term,the logarithmic term related to water saturation and the morphological index n related to water cut are introduced,and the extended water flooding curve equation characterizing the"concave S-shaped"water cut rising law is established.The new equation integrates the charac-teristics and advantages of concave and S-shaped water cut rising curves,broadens the application scope of conven-tional water cut rising curves,and enhances the accuracy of the description of the water cut rising law.The research results are applied to WZ Oilfield.The outcomes reveal that the relevant parameters of the equation are acquired by employing the multiple regression analysis method,and the"concave-S shaped"water cut rising law is comprehen-sively characterized.The fitting effect is significantly enhanced,and the fitted R2 reaches 0.977 8.In the actual ap-plication process,the coefficient of the extended waterflooding curve equation can be acquired through regression based on the existing production data,and the cumulative oil production at different water cuts can be predicted cor-respondingly,or the water cut at different cumulative oil production can be predicted.The research outcomes play a crucial role in accurately analyzing or predicting the law of water cut rise in oilfields.
concave-S shape water cut rising lawwaterflooding curvemorphological indexcharacterization meth-odmultiple regression
万方数据
维普
