低渗透储层流-固耦合渗流规律的研究

STUDY OF FLUID-SOLID COUPLING FLOW IN LOW PERMEABLABLE OIL RESERVOIR

考虑低渗透油藏渗流时启动压力梯度和低渗储层的流-固耦合特性,将渗流力学与弹塑性力学相结合,建立适合低渗透油藏的流-固耦合渗流数学模型,并给出其数值解。在黑油模型和弹塑性有限元程序的基础上,编制了计算低渗透油藏流-固耦合渗流的计算软件。通过数值模拟与不考虑流-固耦合时的计算结果相对比,从中可以看出,低渗透油藏中流-固耦合效应是十分明显的。

By combining elastio-plastic theory and porous flow mechanics ，the fluid-solid coupling mathematical model adapted to low permeable oil reservoir is established. The threshold pressure gradient and the fluid-solid coupling feature of low permeable reservoir are considered in the model. The calculation program of oil seepage is designed on the basis of black oil model. The calculation program deformation is designed according to the elasto-plastic FEM program. Using the software ，a low permeable reservoir is simulated. Contrasting to the result calculated by oil black model ，the fluid-solid coupling effect is obvious.