低渗透油藏水平井分段采油优化模型

针对低渗透油藏水平井的分段采油,考虑变盲筛比的分段完井方法,引入启动压力梯度,基于势的叠加、镜像反映原理和微元线汇思想,分别建立了低渗透封闭油藏和低渗透底水油藏的分段采油耦合模型。以水平井的产量作为目标函数,以生产水平井段的长度和中心点位置作为优化变量,分别建立了两种边界条件的低渗透油藏水平井分段采油优化模型。利用遗传算法,编制数值模拟软件,对水平井分段采油时分段方案进行了优化设计,分别给出了不同分段模式下的最优分段方案。

Research on optimization of horizontal wells with separated production scheme in low permeability reservoir

For the separated production scheme of horizontal well in low permeability,using the potential superposition principle,the mirror image principle and the theory of infinitesimal line congruence,two reservoir/wellbore coupling models were built up,including no flow boundary and bottom water-drive boundary.And the threshold pressure gradient was considered in these new models.Taking the production as the objective function and taking the length and location of horizontal intervals as the optimization variables,two new optimization models for horizontal well with selective completion are built.Applying the genetic algorithm and writing the numerical stimulation software,seven optimized schemes are proposed.