低渗透油藏非线性两相渗流研究  

THE STUDY OF TWO PHASE NON-LINEAR FLOW IN LOW PERMEABILITY RESERVOIR

作　　者：时宇[1] 杨正明[1] 黄延章[1] 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊065007

出　　处：《力学与实践》2008年第5期16-18,23,共4页Mechanics in Engineering

基　　金：中国石油天然气股份有限公司重点科技攻关项目资助(06-02A-02-01).

摘　　要：根据岩心实验提出了两参数的非线性渗流方程,并在此基础上结合Buckly-Leverett方程建立了非线性非混相驱替方程.通过对该方程求解分析可知,与线性达西渗流相比,非线性渗流的驱油相率较差;同一含水饱和度下的含水率更高;而储层中各点的压力梯度更大,导致所需注采压差更大.说明有效的开发低渗透油藏需要比中高渗油藏更小的井距和更高的注采压力体系.Darcy formula is not valid for flows in low permeability reservoirs, due to the obvious non-linear characteristics of the flows. Based on the experiment data of low permeability core, a non-linear formula with two parameters is proposed in this paper. Combining with the Buckly-Leverett formula, non-linear displacement formula is obtained. From the solution of the displacement formula, is compared with the linear flow, it is seen that the displacement efficiency of non-linear flow is lower, the water cut is higher with the same sw, especially, and the pressure gradient is bigger, which means the higher injection/production pressure difference. So, smaller well distance and higher injection/production pressure difference are needed for effectively developing low permeability reservoirs.

关 键 词：非线性渗流 低渗透油藏 两相驱替 

分 类 号：O175.8[理学—数学] TE348[理学—基础数学]