圆形封闭双层油藏分层合采油井产能分析

针对圆形封闭双层油藏,应用Duhamel原理及叠加方法,给出了平面均质油藏层间无窜流、各层初始压力相等或不相等情形下油井井壁压力、各层层面流量的计算公式和方法.采用Stehfest数值反演方法分别计算了油井定产生产时,储层层面流量的变化及各层初始压力不相等时"倒灌"量的变化曲线图.对于给定的油藏-油井系统,分层合采较分层分采是否增产的问题主要决定于每层的初始压力对比情况,其影响由每层的储能系数和渗透系数控制.

Analysis of well productivity by commingled production from selective zones in circular sealed dual layer reservoir

Calculation equation and method for borehole wall pressure and bedding flow rate under conditions of areal homogeneous reservoir without interlayer channeling and equal or unequal initial pressure between each layer are given by using Duhamel theory and additive method in accordance with circular sealed dual layer reservoir.Stehfest numerical inversion is used to calculate the bedding flow rate when production is quantitative,and the "back-flow" rate when initial pressure is different between layers.For a given reservoir-well system,whether commingled production from selected zones is more effective than separated production from selected zones mainly depends on the initial pressure of individual zones,and is decided by reserve capacity factor and seepage factor.