低渗透油藏的非线性渗流理论探讨

针对拖市低渗透油田储集层天然裂缝发育、开发过程中油层渗透率非常数、地下流体渗流不服从达西安律的性质，从变形介质渗流理论研究入手，建立了变形介质带启动压力梯度的非线性渗流的数学模型，推导出了变形介质非线性稳定渗流条件下，油井的产油量和压力计算公式，并对弹性介质达西渗流、变形介质达西渗流、弹性介质非达西渗流和变形介质非线性渗流条件下，油井产油量进行了对比分析，研究表明在相同生产压差下，变形介质非线性渗流条件下油井产油量最低。

Discussion of Nonlinear Flow Theory for Low Permeability Reservoir

This paper developed a nonlinear flow numerical model with starting pressure gradient of de-formation medium zone,in light of such properties of Tuoshi low permeability reservoir as developed natural fractures,non-constant payzone permeability occurred during oilfield development,in-situ fluid flow that is not in accordance with Darcy's Law,and starting from deformation medium percolation theory.Also,it presented equations for well output and pressure under the condition of stable nonlinear flow for deformation medium,and made comparisons of well output under the conditions of Darcy's flow for elastic medium and deformation medium,as well as non-Darcy's flow for elastic medium and nonlinear flow of deformation medium.Study showed that well output for deformation medium nonlinear flow is the lowest at the same producing pressure differential.