化学驱驱替前缘动态追踪数值模拟研究

Reservoir simulation of chemical flooding by dynamically tracking the displacement fronts

将快速自适应组合网格方法用于化学驱动态局部网格加密研究,并在国产化学驱软件ASP上实现了动态局部网格加密,局部加密区域可以随驱替前缘的移动而改变。所研制的动态局部网格加密的模拟结果与全细网格计算的结果非常接近,而CPU时间比整个模拟区域都采用细网格减少一半以上。进行化学驱数值模拟实验,给出了用3种网格系统(粗网格、全细网格以及组合网格)模拟得到的生产井含水率、井网格含油饱和度对比曲线以及含油饱和度的平面等值图。数值模拟实验结果还表明,化学驱对网格大小很敏感,采用细网格或动态局部网格加密是必要的。

Fast Adaptive Composite Grid (FAC) is applied to dynamically tracking chemical flooding fronts and implemented in existing chemical reservoir simulator ASP (alkali/surfactant/ polymer) developed by RIPED, PetroChina. Local grid refinements with less grid blocks and over 50% less computer time than global refinement over the whole domain can be moved and visualized as displacement fronts change without loss of quality and accuracy. With chemical flooding reservoir simulations utilizing proposed FAC method, water cut curves, water breakthrough time and oil saturation contour maps are compared in the three grid systems (global coarse grid system, global fine grid system and composite grid system). The numerical experiments also show that chemical flooding reservoir simulation is sensitive to its grid sizes and it is essential to adopt the global refinement over the whole domain or dynamic local grid refinement.