关键词: 无因次, 求解方法, 油井, 曲线图, 高于饱和压力, 压力恢复曲线, 采出程度, 未饱和油藏, 井底流动压力, 溶气驱

Abstract: The dimensionless IPR (Inflow performance relationship) Curves for a solution gas drive wells presented by Vogel is a very important tool in predicting productivity. At present, the use of Vogel's equation has been expanded to undersaturated reservoirs P_b) and water producing wells in water drive reservoirs. But Vogel's equation can be only used for an "ideal" well (a well without any negative or positive skin factor) and in a stage of primary production. For real wells (damaged or stimulated wells), Standing has developed a modified form to Vogel's equation and presented a set of dimensionless IPR Curves for different flow efficiencies. Richardson and Shaw presented another modified form of Vogel's equation with a parameter V replacing the constant coefficient in Vogel's equation by taking the degree of recovery into consideration. But they do not give a method to determine the value of V. A general formula of the dimensionless IPR Curves is formulated in this paper by combining the above 3 formula together and is linearized against the bottom hole flowing pressure. A method of determining the parameter V is presented, thus the formula can be solved easily and reasonably giving a practical application to the formula. Two examples presented in this paper illustrate that this formula can be used to determine both the maximum productivity and the production rates of a well under different bottom hole flowing pressures.