Establishment and Application of Type Ⅱ Generalized Gas-Water Miscible Flooding Characteristic Curve
Based on the Type Ⅱ generalized water drive characteristic curve,the concept of underground gas-water cut was introduced,and the Type Ⅱ generalized gas-water miscible flooding characteristic curve was established on the basis of analogy.The mathematical model of gas-water cut corresponding to the Type Ⅱ generalized gas-water miscible flooding characteristic curve can be transformed to describe the S-shaped gas-water cut variation and also the convex,S-convex,S-concave,concave,and other shapes of gas-water cut variations,when the characteristic values n and m take different values.This provides additional methods for evaluating development effects of gas-water miscible flooding.The paper put forward a general formula for the Type Ⅱ gas-water miscible flooding characteristic curve and correspond-ing methods for solving the mathematical model of gas-water cut,and evaluated the development effects of the water-alternating-gas misci-ble flooding in the reservoir of Sanjianfang formation in Pubei oilfield and the gas cap+edge water miscible flooding in S31 reservoir in Jin-zhou oilfield,respectively,showing a high fitting accuracy.This work provides a valuable reference for developing other oil reservoirs.
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万方数据
维普
