低渗透油层注水开发的层间突进研究

Study on Interlayer Fingering During Water-flooding Development of Low-permeability Reservoir

低渗透油田层启动压力梯度注水开发应根据储层物性和油水前缘来合理划分层序 ,制定方案更为有效 .针对渗透油层的储层特性 ,利用低渗透储层的渗流理论 ,研究低渗油层注水开发层间突进 ,推导出适合低渗油层注水开发时水驱油的前缘公式 ,并利用推导的公式进行油田实例计算 .结果表明 ,在低渗透油田的开发计算中 ,须考虑低渗透油田储层特性的影响 ,否则会引起较大误差 .得出 ,当启动压力梯度越大时 ,考虑启动压力梯度算出的水驱前缘要远小于不考虑启动压力梯度算出的水驱前缘的结论 .

The difference in the characteristics of oil bearing strata, especially permeability, can lead to the finger advance of oil water front during the waterflooding development of regular multilayer reservoir. In order to avoid severe watered out and to make development program more effective, the different characteristics of oil bearing strata and oil water front should be considered before water drive development. During the development of low permeability reservoir, the existence of starting pressure gradient makes this problem even complex. By using porous flow theory of low permeability reservoir, this paper reduces a water oil front movement formula suitable to waterflooding development of low permeability reservoir. The effect of starting pressure gradient on the advance of the oil water front is analyzed.