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针对油气两相流动试井的规律无法用解析方法得到准确认识的事实 ,提出用数值解法来求解的思路 .用数值方法对在均质油藏不存在初始饱和度梯度情况下 ,油气两相流压恢试井的一般规律进行了研究 ,分析了初始饱和度分布、油气两相黏度比及相对渗透率关系的影响 ;进而又研究了初始饱和度梯度对试井规律的影响 .研究首次发现 ,由于高压缩性气体参与渗流 ,会使压力导数曲线表现出了类似于单相流双重介质的“凹子”特征
Aiming at the fact that the law of well test of oil-gas two-phase flow can not be accurately recognized by analytical method, a numerical solution method is proposed to solve the problem.Under the condition of no initial saturation gradient in homogeneous reservoir, The general laws of pressure-well testing are studied, and the influence of the initial saturation distribution, the viscosity ratio of two phases to the relative permeability, and the influence of the initial saturation gradient on the well testing law are also studied. For the first time, Due to the high compressibility of the gas in the seepage, the pressure derivative curve shows a “concave” feature similar to the single-phase dual flow media