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本文研究了裂—隙油藏渗透率不同的两个同心圆柱形地层中,中心一口生产井生产时的不稳定渗流问题。利用拉普拉斯变换,求出了两个区域中压力分布的精确解和长时渐近解。通过电子计算机对精确解的计算结果分析,揭示了这类油藏中的基本渗流特征,讨论了与均质裂—隙油藏渗流特征的差异。同时,本文也推出了实用的压力降和压力恢复公式,给出了确定近井变渗透率区地层大小的方法,以及指出了反求这类油藏其它参数的方法。
In this paper, we study the unsteady seepage problems in the production of a central well in two concentric cylindrical formations with different permeability of fractured-gap reservoirs. Using Laplace transform, the exact solution and long-term asymptotic solution of pressure distribution in two regions were obtained. The computational results of the exact solution are analyzed by computer, revealing the basic seepage characteristics of these reservoirs and discussing the difference with the seepage characteristics of homogeneous fractured-gap reservoirs. At the same time, the paper also presents practical pressure drop and pressure recovery formulas, gives the method of determining the formation size of the near-well permeability zone, and points out the methods of reverse seeking the other parameters of this type of reservoir.