传统油藏数值模拟软件只能考虑静态裂缝,无法模拟长期注水过程中裂缝扩展对于井网开发的影响,模拟结果与实际生产动态数据的拟合效果较差。针对该问题,基于嵌入式离散裂缝模型(EDFM),通过前处理算法的动态改进,形成了复杂动态裂缝网络的表征方法,并通过耦合交叉裂缝判别准则建立了一种高效的注水诱导裂缝模拟方法。研究表明:注水诱导裂缝模拟方法能够高效模拟油藏注水开发过程中裂缝的动态变化,反映天然裂缝对于主裂缝扩展路径的影响;与Abaqus软件计算结果一致,计算效率更高。实践应用表明,该方法对注水诱导裂缝数值模拟具有较好的适应性,可准确实现对现场注水井组含水上升规律的拟合,对超低渗透油藏的生产动态分析、后期井网调整具有较好的借鉴意义。
Traditional reservoir numerical simulation software just only consider the static fractures but cannot simulate the impact of fracture expansion on well network development during long-term water injection, and the simulation results are poorly fitted to the actual production dynamic data. To address this problem, a characterization method for complex dynamic fracture networks is developed based on the embedded discrete fracture model (EDFM) with dynamic improvement of pre-processing algorithms. The study shows that an efficient waterflood-induced fracture simulation method is established by coupling cross-fracture discrimination criteria, which can efficiently simulate the dynamic changes of fractures during reservoir injection and development and reflect the influence of natural fractures on the main fracture propagation path; the results are consistent compared with Abaqus software, while the computational efficiency is higher. The application example shows that the method has good adaptability for numerical simulation of waterflood-induced fractures, can accurately achieve the fitting of the water cut rising rules of the field water injection well cluster, which and has good reference significance for production dynamic analysis of ultra-low permeability reservoirs and later well pattern adjustment.
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