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在低渗透气藏开发领域的理论研究与工程实际应用中,需要根据渗流运动定律建立渗流数学模型,以对工程技术指标进行定量计算与分析。文章分析了在含束缚水条件下低渗透岩石介质气体渗流实验结果,得到了其渗流规律及特征,即在气体渗流速度与压力梯度的关系图上表现为从较低压力梯度下的凹形曲线至较高压力梯度下的直线连续变化的非线性渗流曲线。根据渗流实验结果,建立了含束缚水的低渗渗透岩石介质气体非线性渗流定律。该定律与气体渗流实验结果吻合很好。达西线性渗流定律只是本定律的特例。新的非线性渗流定律可运用于低渗透介质气体非线性渗流理论及工程应用研究,为低渗透介质天然气资源开发与低渗透岩石介质环境地质工程评价奠定了理论基础,对多种领域的工程实际应用具有重要指导意义。

GAS NONLINEAR PERCOLATION LAW IN LOW PERMEABLE MEDIUM WITH IRREDUCIBLE WATER 1)

In the theoretic study and practical application to develop low permeable gas reservoirs, the mathematical model of percolation should be established based on percolation moving law to quantitatively calculate and analyze the engineering technical indexes. The article analyzes the experiment results of gas percolating in low permeable medium with irreducible water, and gets its percolation law and features,that appear on the relational chart of percolation velocity vs. pressure gradient as a nonlinear percolation curve which changes continuously from a concave curve under low pressure gradient to a straight line under high pressure gradient. According to the experiment results of percolation,the gas nonlinear percolation law in low permeable medium with irreducible water is found. The law matches the experiment results of gas percolation well. The Darcy linear percolation law is a special case in the law. The new nonlinear percolation law can be used for study of gas nonlinear percolation theory in low permeable medium and engineering application. It provides the theoretical ground for the development of gas resource in low permeable medium and the geological evaluation of low permeable medium environment, and makes the important reference for practical engineering application of many fields.