网格方向性对水驱油油藏数值模拟结果的影响

本文研究了网格方向性对水驱油油藏数值模拟结果的影响。研究表明,在直角坐标系中,如果采用五点差分法,油藏数值模拟结果受网格方向性的影响很严重,且随着原油粘度增加,其影响程度愈来愈强。平行网格系统所模拟的生产井见水时间比对角网格系统所模拟的生产井见水时间短,前者比实际见水时间短,后者比实际见水时间长。若采用九点差分法,可以消除网格方向性对水驱油油藏数值模拟结果的影响,九点差分法模拟的生产井见水时间介于上述两者之间,而且更接近实际情况。

The Influences of Grid Orientation on the Results of Reservoir Simulation in oil Reservoir Drived by Water

This paper is a report on the study of the influences of grid orientation on the results of reservoir simulation in oil reservoir drived by water. It has been proved that the results of reservoir simulation are affected seriously by the grid orientation when using five-point-difference method in X-Y coordinates system. The influences become more serious when oil viscosity increases. Water-breakthrough-time in production wells simulated in parallel grid system is shorter than that in production wells simulated in diagonal grid system. The former is shorter and the latter is longer than the actual water-breakthrough-time. The influences of grid orientation on the results of reservoir simulation can be eliminated by using nine-point-difference method. The water-breakthrough-time simulated in nine-point-difference is between the both above-mentioned and approximate to actual value.