基于Cluster的大型油藏数值模拟的并行计算

Parallel computing for large-scale numerical simulations of oil reservoirs based on Cluster systems

大规模整体油田的精细油藏数值模拟需要并行处理。该文基于Cluster并行系统,将三维三相油藏压力计算,转化为以油层为并行计算粒度、通过井筒压力耦合全油藏压力的多层二维二相的压力计算,用网格节点排序方法和预处理算法等缩短计算时间,实现了100.2万网格点的实际大规模油藏数值模拟问题,在17个处理机并行计算时,加速比达6.75。结果表明,该并行计算具有较好的效果,该并行软件正在胜利油田得到应用。

Fine numerical simulations of large scale subsurface oil reservoirs require parallel processing. However, the many oil and roch layers in reservoirs in eastern China made three dimensional, threephase analysis of oil layer pressures prohibitive even with parallel processing so a twodimensional, twophase calculation was used for the pressure. The analysis treats the layers as a porous matrix and couples the well pressure to the pressure of the whole reservoir. A nonuniform grid cell distribution and an effective preconditioning algorithm were used to reduce the oil layer pressure calculation time. The numerical simulation of a large reservoir with more than one million elements was significantly faster than previous analyses which allowed more accurate simulation of the reservoirs. The parallel calculation used 17 processors with an acceleration ratio of 6.75. The numerical results show that the parallel implementation can provide large computer simulations of reservoir problems. The parallel software is being applied to study the Shengli Oil Field.