缝洞型油藏拟颗粒法多尺度流动模拟

缝洞型油藏储集空间类型多样，且尺度差异非常大，储层中多种流动状态共存，既有孔隙渗流，又有溶洞自由
流，属典型的多尺度多相复杂流动，物理仿真实验及常规数值模拟难以准确地描述此类油藏流动特征。基于拟颗粒方
法建立油水两相流动多尺度离散计算模型，利用其在界面追踪上的优势，通过在两相界面处引入一种斥力的方式实现
表面张力模拟，建立了表面张力模型，实现了缝洞型油藏的油水流动模拟，并通过理论分析及与实验现象对比的方法，
验证了模型的正确性。结果表明：该方法能够在不同尺度上刻画此类油藏油水流动特征，可以取代室内物理仿真实
验，确定不同缝洞组合类型下的剩余油分布情况，能够进行宏观油藏模拟，为此类油藏的高效开发奠定基础。

A Study on Fracture Vuggy Reservoir Multi-scale Flow Simulation Based on Pseudo-particle Method

Abstract：Fractured vuggy reservoirs have various types of reservoir space which are greatly different. There are many typical
multi-scale and multi-phase complex flow states in the reservoir，including flow in porous medium，free flow in the cave，etc.，
which makes it difficult to accurately describe the flow characteristics of such reservoirs based on the physical simulation results
and conventional numerical simulation methods. In this paper，we establish two phase flow multi-scale discrete calculation
models based on pseudo-particle method. Relying on its advantages in the interface tracking，simulated the surface tension
through introducing a repulsion between the two phase interfaces，the surface tension model is established to realize the two
phase flow simulation of fractured vuggy reservoirs. Then we verified correctness of the model through theoretical analysis
and comparison with the physical experimental phenomena. The results show that this method can simulate two phase flow of
this type reservoir in different scale，which can replace the physics simulation experiment，and determine the distribution of
remaining oil in different fractured vuggy combination type as well as can simulate large scale macroscopic reservoir，it is to
lay a foundation for efficient development of this type reservoir.