Comparison of oil displacement mechanisms and performances between continuous and dispersed phase flooding agents

• 作者: JIANG Weidong KANG Xiaodong LI Qiang LU Xiangguo SUN Zhe WU Xingcai ZHANG Jing
• 来源期刊: 石油勘探与开发:英文版
• 学科: 工学
• 关键词: POLYMER FLOODING particle-type POLYMER POLYMER water dispersion PARTICLE phase separation microfluidic technology deep fluid DIVERSION ability oil DISPLACEMENT mechanism
• 年，卷（期）: 2019,（1）
• 页码范围: 121-129
• 页数: 9页
• 分类号: TE357.46

摘要

To compare the oil displacement mechanisms and performances of continuous phase flooding agent(traditional polymer solution) and dispersed phase flooding agent(particle-type polymer SMG dispersion), the particle phase separation of SMG dispersion migrating in pores was simulated by using the microfluidic technology. Theoretically guided by the tree fork concentration distribution of red cells in biological fluid mechanics, the concentration distribution mathematical model of SMG in different pores is established. Furthermore, the micro and macro physical simulation experiments of continuous and dispersed phase flooding agents were carried out. The results show that the continuous flooding agent enters all the swept zones and increases the flow resistance in both larger and small pores. On the contrary, the particle phase separation phenomenon occurs during the injection process of dispersed flooding agent. The SMG particles gather in the larger pore to form bridge blinding, and the carrier fluid displace oil in the small pore. Working in cooperation, the SMG particle and carrier fluid drive the residual oil in the low permeability layers step by step and achieve the goal of enhanced oil recovery. The laboratory experimental results indicate that, the oil increment and water reduction effect of dispersed flooding agent is much better than that of continuous flooding agent, which is consistent with the field test results.