浅析两相采油指数与单相采油指数的关系

对溶解气驱饱和油藏甚至未饱和油藏来说 ,当井底流压低于饱和压力时 ,井筒附近存在两相流动 ,油井有一个两相采油指数 ;当井底流压高于或等于饱和压力时 ,井筒附近存在单相流动 ,油井有一个单相采油指数。经对 Hasan、Fetkovich、陈元千和李晓平等得出的采油指数的数学表达式分析对比表明 ,两相采油指数和单相采油指数之间存在一定的关系 ,但两相采油指数不能用产量与压力关系曲线的切线来代表

Simple Analysis of the Relationship Between Two Phase Productivity Index and Single Phase ProductivityIndex.

For dissolved gas drive saturated reservoir and even unsaturated reservoir,when bottom hole flowing pressure isbelow saturation pressure,it exists two phash flow near wellbore,there is a two phase productivity index in theoil well. While bottom hole flowing pressure is above or equal to saturation pressure,it exists single phase flownear wellbore, there is a single phase productivity index in the oil well. Through analysis and comparison tomathematical expression of productivity index generated by Hasan,Fetkovich,Chen Yuan qian and Li Xiaoping,it indicates that there is a certain relationship between two phase productivity index and single phase productivityindex, but two phase productivity index can not be represented by the tangent line of production rate versuspressure relation curve.