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将自适应网格法推广到复杂边界稠油油藏的蒸汽注采过程,针对复杂边界附近的网格提出相应的粗化算法。首先,在实施自适应网格算法之前对边界上最精细网格上的计算参数进行预处理以提高计算精度,然后,再利用同样的预处理方法对自适应网格法中边界处的各层次粗网格的渗透率进行粗化。在建立动态AMR网格系统的网格粗化准则中,仅采用油藏温度和各相饱和度的空间变化作为控制阈值,这样边界区域在相变锋面未到达时将自适应地采用粗网格进行计算。数值算例显示边界附近自适应地采用粗网格进行计算并不影响油藏数值模拟的计算精度,自适应网格法在保持计算精度的同时,大幅度提高了计算速度。
The adaptive grid method is extended to the process of steam injection and production of heavy oil reservoirs with complex boundaries. Corresponding roughening algorithms are proposed for the grids near complex boundaries. First of all, before the adaptive grid algorithm is implemented, the calculation parameters on the finest grid on the boundary are preprocessed to improve the accuracy of the calculation. Then, the same preprocessing method is applied to the grids at the boundaries Coarse mesh permeability is roughened. In the grid roughening criterion of dynamic AMR grid system, only the spatial variation of reservoir temperature and saturation of each phase is used as the control threshold, so that the boundary region will adaptively adopt the coarse grid when the phase change front has not arrived Calculation. The numerical examples show that the adaptive calculation of coarse grid near the boundary does not affect the calculation accuracy of reservoir numerical simulation. The adaptive grid method can greatly improve the calculation speed while maintaining the calculation accuracy.