不同井网砂岩油藏三维数值研究

Three-dimensional Numerical Simulation of Sandstone Reservoir With Different Well Pattern

基于流体力学以及渗流力学原理,将油藏假定为多孔介质,建立了多孔介质水驱油流固耦合方程,对同一油藏的三种不同井网进行了三维数值研究。得出整个油藏平面的压力分布,不同采油年份剩余油质量分数分布规律、以及采油过程中关键因素采收率,得到准确的采油能力大小排列,并最终选出最优井网。采油从开始到采油2 a这段时间内,3种井网采油率由小到大的排列顺序为:排状法<5点法<9点法,采油2 a到8 a间采油率有小到大的排列顺序为:排状法<9点法<5点法,三种采油方式都是采油达到8 a时采收率达到最高值,采油时间达到6 a之前,采油率增长较为明显。

Fluid and solid coupled heat transfer control equation of water-driven oil in porous media was established by the theory of percolation mechanics and fluid mechanics. Three-dimensional numerical simulation of the same reservoir with three different well patterns was carried out. The plane pressure distribution of the reservoir was obtained as well as different year oil remaining oil content distribution and key factors in the process of oil recovery. The order of oil production capacity was determined, and the optimal well spacing was ultimately got. The results show that, within two years from the beginning of oil production, three kinds of well patterns＇ productivity order is： row-like method five-point method nine-point method; from the third year to the eighth year, three kinds of well patterns＇ productivity order is： row-like method nine-point method five-point method; the productivity of all three methods can reach the highest value in the eighth year; in initial six years, the growth of productivity is obvious.