对于底水油田的数值模拟,必须考虑垂直方向的油水运动,因此只能用三维模型,而且水锥都产生在井筒附近,所以要使计算指标符合实际,就必须在井筒附近加密网格划分。这样用一般的矩形网格,就会使得网格过多,计算无法进行。本文提出采用全油田三维矩形网格和单井轴对称网格结合,互相交替计算的方法,解决了这个问题。对两个油田进行了模拟计算,取得了良好的结果。 For the numerical simulation of the bottom water field, the oil-water movement in the vertical direction must be considered. Therefore, the three-dimensional model can only be used and the water cones are generated near the wellbore. Therefore, to make the calculation index practical, it must be encrypted mesh near the wellbore. This use of a general rectangular grid, it will make the grid too much, the calculation can not be carried out. This paper proposes a solution to this problem by using a combination of three-dimensional rectangular grids in the entire oilfield and symmetrical grids in a single well, which are alternately calculated. The two oilfields were simulated and achieved good results.