三维蒸汽辅助重力驱油过程的自适应网格法

Adaptive mesh refinement for three-dimensional SAGD process

针对蒸汽辅助重力热采稠油过程中,蒸汽腔周围存在的物理量变化十分剧烈的锋面及计算计算网格必须足够的小的问题,为了有效提高对蒸汽辅助重力驱油问题的数值计算效率,研究了考虑井筒与油藏间相互耦合的三维均匀油藏的蒸汽辅助重力驱油问题的自适应网格方法,自适应网格法和均匀精细网格法之间的计算结果对比表明自适应网格法可以大幅度地提高对于蒸汽辅助重力驱油这一复杂流场的计算速度并具有很好的精度。

In steam assisted gravity drainage(SAGD) process,there is a sharp interface around the steam chamber.Because of rapid variations of the physical quantities across the interface,numerical grids must be fine enough to achieve a reasonable accuracy.To improve the calculation efficiency for SAGD process,the adaptive mesh refinement(AMR) technique is applied in the numerical simulations of the three-dimensional SAGD process for homogeneous reservoir,where the coupling between the reservoir flow and the wellbore flow is considered.Numerical example indicates that the AMR technique is fast and can give good accuracy.