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对复杂断层油藏蒸汽注采过程采用自适应网格法进行了数值研究,将断层处理成绝对渗透率极低的介质,而不是内边界.当利用自适应网格法划分网格时,并没有将断层区域处理成细网格,而是当蒸汽锋面尚未波及时自适应地采用粗网格.对于最精细层上含有断层的网格的渗透率提出了简单的计算方法,在此基础上利用重正化方法计算自适应网格各层粗网格的等效渗透率.数值结果表明:断层附近物理量变化较缓时采用较粗层次的网格不影响计算精度,采用自适应网格法可以大幅度地提高复杂断层油藏蒸汽注采过程的计算速度.
In the process of fault injection and recovery of complex fault reservoirs, an adaptive grid method was used to conduct numerical study, and the fault was processed into a medium with extremely low absolute permeability, rather than the inner boundary. When using adaptive gridding method to divide grids, Instead of processing the fault area into a fine grid, the coarse grid is adapted adaptively when the front of the steam has not yet spread, and a simple calculation method is proposed for the permeability of the grid containing the fault on the finest layer Using the renormalization method, the equivalent permeability of the coarse grid in each layer of the adaptive grid is calculated.The numerical results show that the coarse grid does not affect the calculation accuracy when the changes of the physical quantities near the fault are slow, and the adaptive grid method Can greatly improve the calculation speed of steam injection and production process in complex fault reservoirs.