各向异性油藏水平井开发井网设计方法

为解决水平井井网开发各向异性油藏的布井问题，对各向异性油藏水平井开发井网特征进行分析研究。各向异性渗透率对水平井网具有非常显著的破坏性作用。理论分析认为：各向异性油藏布井时，应该使主渗透率方向、井排方向和水平井段方向三者呈两两平行或垂直关系，其中水平井段垂直于最大主渗透率方向，井网几何参数由各向异性强度计算确定。油藏数值模拟实例计算结果与理论分析一致。各向异性油藏和等价各向同性油藏具有相同的开发指标，优化井网的油藏开发指标明显好于非优化井网。通过等价各向同性油藏水平井网分析对各向异性油藏水平井网进行优化；选取井网单元的面积、横向井距和水平井段长度作为独立参数，形成了84种模板方案，为实际油藏工程设计提供依据。图6表2参10

Methodology for horizontal well pattern design in anisotropic oil reservoirs

Anisotropic permeability has prominent affects on horizontal well networks. Well lines, horizontal sections of the wells, and the principal direction of anisotropic permeability should be parallel or perpendicular to each other, in which the horizontal well sections should be perpendicular to the direction of the maximum principal permeability. The geometric parameters of the well pattern are calculated with the degree of anisotropy. Numerical reservoir simulation results are consistent with the theoretical analyses. The reservoir development results of the optimized well pattern considering the affects of anisotropy are remarkably better than that of non-optimized well pattern. With the selection of area of well pattern unit, lateral well spacing and horizontal well length as the independent parameters, 84 kinds of model cases are provided as references for practical reservoir engineering designing.