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| 非均相复合驱非连续相渗流特征及提高驱油效率机制 |
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侯健1,2,吴德君1,2,韦贝1,2,周康1,2,巩亮3,曹绪龙4,郭兰磊5
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(1.非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛 266580;2.中国石油大学(华东)石油工程学院,山东青岛 266580;3.中国石油大学(华东)新能源学院,山东青岛 266580;4.中国石化胜利油田分公司,山东东营 257015;5.中国石化胜利油田分公司勘探开发研究院,山东东营 257015)
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| 摘要: |
| 非均相复合驱是聚合物驱后油藏大幅度提高采收率的重要方法。微流控实验及室内双管岩心流动实验均表明非均相复合驱具有非连续相渗流特征,表现为压力一定条件下微通道内流速仍大幅波动、不同渗透率双管岩心中分流量持续交替变化。综合考虑凝胶颗粒弹性变形特征、聚合物增黏与非牛顿特性、表面活性剂降低界面张力作用及润湿改变等化学剂作用机制,建立非均相复合驱微观渗流格子玻尔兹曼模拟方法。基于微观数值模拟结果,揭示非均相复合驱提高驱油效率机制,颗粒暂堵升压后变形运移、固液增阻导致液流转向、驱替液增黏抑制黏性指进、强化启动微观剩余油,进而提高微观波及系数及微观洗油效率。 |
| 关键词: 非均相复合驱 非连续相渗流 凝胶颗粒 微观渗流模拟 |
| DOI：10.3969/j.issn.1673-5005.2019.05.014 |
| 分类号::TE 312 |
| 文献标识码:A |
| 基金项目:国家自然科学基金杰出青年基金项目(51625403)；国家自然科学基金项目(51574269)；“十三五”国家油气重大专项(2016ZX05011-003) |
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| Percolation characteristics of discontinuous phase and mechanisms of improving oil displacement efficiency in heterogeneous composite flooding |
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HOU Jian1,2, WU Dejun1,2, WEI Bei1,2, ZHOU Kang1,2, GONG Liang3, CAO Xulong4, GUO Lanlei5
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(1.Key Laboratory of Unconventional Oil ＆ Gas Development(China University of Petroleum(East China)), Ministry of Education, Qingdao 266580, China;2.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;3.College of New Energy in China University of Petroleum (East China), Qingdao 266580, China;4.Shengli Oilfield Branch Company, SINOPEC, Dongying 257015, China;5.Shengli Oilfield Exploration and Development Research Institute, SINOPEC, Dongying 257015, China)
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| Abstract: |
| Heterogeneous composite flooding is an important method for greatly improving oil recovery after polymer flooding. The microfluidic and double-sandpacks displacement experiments show that the heterogeneous composite flooding appeared with percolation characteristics of discontinuous phase, which can be reflected by a large fluctuation of flow velocity in the microchannels and the continuous alternating change of fractional flow in sandpacks with different permeability. In this study, a microscopic percolation lattice Boltzmann method for heterogeneous composite flooding was established, in which the elastic deformation characteristics of gel particles, the viscosity increase and non-Newtonian properties of polymers and the interfacial tension reduction and wettability altering mechanism of surfactants were considered and simulated. Based on the simulation results, the mechanisms of improving oil displacement efficiency via heterogeneous composite flooding were revealed. Firstly, temporary blockage of flow pathways by gel particles can lead to pressure increase, and then the particles can remigrate with their deformation under high pressure. Secondly, the particle-liquid interactions can increase flow resistance, and consequently change the flow direction. Meanwhile, the polymer in the flooding fluid can increase the fluid 's viscosity and inhibit viscous fingering. At last, the composite fluid can also move up of the remaining oil in microscopic state. The combination of these mechanisms can improve both the microcosmic sweep coefficient and microcosmic oil displacement efficiency. |
| Key words: heterogeneous composite flooding discontinuous phase flow gel particles microscopic percolation simulation |
