论文部分内容阅读
本文应用三维三相黑油模型对等厚均质水平地层在不同流度比下,不同注入速度下,对五点系统、七点系统、直线排状系统及交错排状系统的面积扫油效率进行了系统计算。计算结果表明,井网系统不同,同一流度比下,面积波及系数也不同。五点系统最高,依次为交错排状、直线系统和七点系统。在不利流度比下,驱替的不稳定过程对五点和七点系统的波及系数的影响小于对交错排状和直线排状系统。当流度比从0.2增加至10时,波及系数急剧下降。当流度比进一步增大时,其递减速度减缓。见水后继续注水,面积波及系数可继续增大,直至地层全部水浸。在同一流度比下,含水率小于50％时,随着含水率的上升,面积波及系数增加缓慢。但当含水率高于60％时,随着含水的上升而急剧地增加。文中根据计算结果得出了不同井网条件下,不同注入孔隙体积倍数(或不同含水)时,波及系数与流度比的关系曲线,由这些曲线构成的图版可以用来进行注水井网动态过程的计算和确定油藏采收率。
In this paper, the three-phase three-phase black oil model is used to test the area sweeping efficiency of five-point system, seven-point system, straight row system and staggered row system for the equal thickness homogeneous horizontal stratum at different flow rates and different injection velocities The system was calculated. The calculation results show that the well network system is different, the same flow ratio, the area spread factor is also different. The highest five-point system, followed by staggered rows, linear systems and seven-point system. Under unfavorable flow ratio, the effect of displacement instability on the sweep coefficients of five-point and seven-point systems is less than that of staggered and straight row systems. When the flow ratio increases from 0.2 to 10, the sweep coefficient drops sharply. When the fluidity ratio further increases, its rate of decrease slows down. See the water after the injection, the area can continue to increase the factor, until the formation all flooding. Under the same flow ratio, when the water content is less than 50%, the coefficient of surface area increases slowly with the increase of water content. However, when the water content is higher than 60%, the water content increases drastically. According to the calculation results, the relation curves between the wave propagation coefficient and the flow ratio at different pore volume multiples (or different water contents) under different well pattern conditions are obtained. The plates formed by these curves can be used to carry out the dynamic process of water injection well pattern Calculation and determination of oil recovery.