低渗透油田建立有效驱替压力系统研究

Establish effective displacement pressure system in low permeability oilfield

启动压力规律和渗流理论研究表明,只有当驱替压力梯度完全克服油层启动压力梯度时,注采关系才能建立,因此克服低渗透油层启动压力梯度的最小驱替压力梯度所对应的注采井距,即是注水井和生产井之间能够建立有效驱替的最大注采井距。根据低渗透油田油气渗流理论推导出不等产量的注水井和生产井之间驱替压力梯度的分布表达式,可以反映出注水井与生产井之间的压力分布情况。模拟计算表明,若将该成果应用于低渗透注水开发油田将会明显改善开发效果。

The study of starting pressure and percolation theory shows that the injection-production relation can be established only when the displacement pressure gradient totally overcomes reservoir starting pressure gradient.Therefore,the producer-injector spacing corresponding to the minimum displacement pressure gradient overcoming the starting pressure gradient of low permeability reservoir is just the maximum spacing for establishing effective displacement between injector and producer.The expression of the distribution of displacement pressure gradient between injectors and producers with various productions is deduced pursuant to oil and gas percolation theory in low permeability reservoir,showing pressure distribution between injectors and producers.Simulated calculation indicates that if this result is used in waterflooded low permeability oilfield,the development response will be improved obviously.