低渗透油藏微乳液驱非线性渗流规律研究

摘要

以低渗透油藏为研究主体,分析低渗透岩心微观渗流特征,对比低渗透油藏水驱和微乳液驱条件下启动压力梯度的变化,从引起低渗透油藏存在启动压力梯度的边界层性质出发,研究低渗透油藏表面活性剂微乳液驱条件下的低速非线性渗流规律,建立相应的非达西渗流方程,并通过模拟已实验过的低渗透油藏岩样的实验结果来验证所建立非达西渗流方程的准确性.%In this paper,the micro-seepage characteristics of low-permeability cores in low permeability reservoirs are analyzed,and on the basis of experimental research,the changes of starting pressure gradient under the condition of water flooding and microemulsion flooding in low permeability reservoir are compared.Based on the boundary layer properties that initiate the pressure gradient of the low permeability reservoir,the low velocity nonlinear seepage flow under the condition of microemulsion flooding in the low permeability reservoir is studied,and the corresponding non-Darcy percolation equation is established.And the accuracy of the non-Darcy percolation equation is verified by simulating the experimental results of the experimental rock samples.