项目名称： 缝洞型碳酸盐岩油藏多相流体流动规律与剩余油形成机理研究

项目编号： No.51504268

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 矿业工程

项目作者： 宋兆杰

作者单位： 中国石油大学（北京）

项目金额： 20万元

中文摘要： 我国缝洞型碳酸盐岩油藏油气探明储量和产量逐年增加，已成为西部油气资源的重要接替。该类油藏存在基质渗流能力极弱、大裂缝和溶洞发育、流体管流特征明显等特点。目前研究大多借鉴碎屑岩的渗流理论，部分考虑了缝洞型介质流体管流特征，但模型假设较理想，生产应用中预测误差较大，难以有效指导油井产能评价。本课题拟根据我国典型缝洞型油藏裂缝和溶洞分布特征，制作不同缝洞尺度、缝-缝和缝-洞连通模式、缝-缝和缝-洞组合关系的裂缝系统和缝洞系统物理模型，通过室内实验和模拟计算，开展油水、油气流动两相界面影响因素分析，揭示缝洞型油藏流体管流流动规律；应用多相管流理论分析与描述裂缝和溶洞中流体流动特征，建立缝洞型油藏流体流动数学评价模型；基于上述研究成果，利用与实际储层相似的多缝多洞组合缝洞网络模型，通过室内实验明确多因素影响的剩余油分布特征，揭示剩余油形成机理，为缝洞型油藏剩余油挖潜和提高采收率技术应用提供科学依据。

中文关键词： 碳酸盐岩油藏；缝洞网络；多相流体流动；物理模拟；剩余油

英文摘要： The annually increasing proved reserves and production promote that fractured-vuggy carbonate reservoirs serve as a significant substitution of hydrocarbon resources in West China. The features of fractured-vuggy carbonate reservoir include the ultra-low permeability of carbonate rocks, the co-existence of large fractures and vugs, and the fluid pipe flow. Most of previous emphases were placed on fluid flow characterization using the systemic theory of clastic reservoirs. The pipe flow characteristics were considered in some studies, while the model assumption was too ideal, which causes that the field application is limited and the studies do not work well for the evaluation of well productivity. Based on the fractures and vugs distribution of typical fractured-vuggy carbonate reservoirs in China, fracture system models and fractured-vuggy system models will be fabricated with a consideration of the size, connected mode and conjunction of fractures and vugs. Combining physical simulation with reservoir simulation executions, the governing factors of oil-water and oil-gas interfaces are discussed. And thus, the fluid pipe flow mechanisms are demonstrated in fractured-vuggy carbonate reservoir. The theory of multi-phase pipe flow is used to quantitatively characterize fluid flow, and the mathematical model is established. Based on the complex fractured-vuggy network models that are more in accordance with reservoir features, the distribution and formation mechanisms of remaining oil are illustrated through further laboratory experiments. This research work could provide a practical guide on the recovery of remaining oil and the implementation of EOR projects in fractured-vuggy carbonate reservoirs.

英文关键词： Carbonate reservoir;Fractured-vuggy network;Multi-phase fluid flow;Physical simulation;Remaining oil