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低渗透油藏不仅渗透率低,储层存在一定的应力敏感性,而且原油在地层中的流动不满足达西定律。文章针对这些特点,引入变启动压力梯度和渗透率模数,建立了低渗透油藏两相流试井解释模型,并采用数值方法求解,绘制压力和压力导数双对数曲线。结果表明:初始含水饱和度、相渗曲线会使得压力和压力导数曲线的中后期出现上移或者下移。
Low-permeability reservoirs not only have low permeability, some stress sensitivity exists in reservoirs, but also the flow of crude oil in the formation does not satisfy Darcy’s law. In view of these characteristics, this paper introduces a variable pressure gradient and permeability modulus, and establishes a well interpretation model for two-phase flow in low-permeability reservoirs. The numerical solution is used to obtain the double logarithmic curve of pressure and pressure derivative. The results show that the initial water saturation and phase - infiltration curves will make the pressure and pressure derivative curves move up or down in the middle and later periods.