角点网格传导系数计算

油藏数值模拟在油藏开发和提高原油采收率方面具有重要的指导意义,传导系数的计算是油藏数值模型中的重要部分,在很大程度上决定了数值模型模拟的准确性。文中在实际地层结构的基础上,考虑了角点网格的复杂性以及相邻网格间交接面的不规则性等因素,建立了角点网格间传导系数的数值计算模型。该方法克服了块中心网格不能很好地描述复杂裂缝形状和流体流动状态等不足,充分体现了相邻网格间不同形状交接面对传导系数的影响。最后,按照该方法,针对1个有代表性的油藏实例(包括带有断层、尖灭等复杂情况),计算出相应角点网格的传导系数,并与通用商业软件Eclipse的计算结果进行对比,二者较为接近。

Computation of transmissibility between corner-point grids

The reservoir numerical simulation plays an important part in petroleum reservoir exploitation and enhanced oil recovery. The computation of transmissibility is an essential part in the reservoir numerical model, which largely affects the accuracy of the model. Considering the complexity of comer-point grid and the irregularity of the interface between grids, this paper establishes the computational numerical model for the transmissibility between comer-point grids on basis of the actual stratum structure. This method overcomes the disadvantage that the grids in block center can not describe the complex fracture shape and fluid flow state, and fully reflects how the interface shape between grids will affect the transmissibility. Finally, using the method proposed in this paper, we choose a typical reservoir which includes fault and pinch-out to compute its transmissibility between comer-point grids. By comparing our result with the result derived by the software Eclipse, it is shown that our algorithm is more accuracy.