低渗透油藏反九点井网面积波及系数研究

Research on Sweep Efficiency of Inverted Nine-Spot Pattern in Low Permeability Reservoir

将反九点井网划分为角井注采单元和边井注采单元,利用流线积分法计算反九点井网面积波及系数,分析角边井控制单元分界线位置与角边井工作制度之间的关系,以及启动压力梯度、注采压差等参数对反九点井网水驱面积波及系数的影响。研究结果表明,充分考虑角边井控制单元分界线位置的变化,并适当增大角井的注采压力,有利于实现均衡驱替及增大反九点井网面积波及系数。

After the reverse nine point well pattern is divided into corner well injection production unit and side well injection production unit,calculation of area sweep efficiency of inverse nine point well pattern is carried out by flow line integral method,and the relationship between the boundary position of the control unit and the working system of the corner well is analyzed.The effects of threshold pressure gradient and injection production parameters on the areal sweep efficiency of square inverted nine-spot pattern are analyzed.Research results show that change of boundary between corner well cell and edge well cell can effect calculated results of sweep efficiency,and it is profitable to increase injection-production pressure difference of corner well appropriately for equilibrium displacement and increase sweep efficiency of inverse nine-spot pattern.