稠油降粘剂辅助CO2泡沫驱提高采收率机理及剩余油状态研究：二维微可视化实验案例,Energy & Fuels

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稠油降粘剂辅助CO2泡沫驱提高采收率机理及剩余油状态研究：二维微可视化实验案例
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-11-18 , DOI: 10.1021/acs.energyfuels.3c03212
Wenyang Shi ₁ , Yunpeng Ma ₁ , Lei Tao ₁ , Na Zhang ₂ , Chunhui Ma ₃ , Jiajia Bai ₁ , Zhengxiao Xu ₁ , Qingjie Zhu ₁ , Youlin Zhong ₄

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传统的降粘剂辅助水驱虽然可以提高稠油采收率，但相对于扩大波及范围、推进驱替前缘深度等方面还没有足够的优势。CO ₂泡沫可以很好地弥补驱油过程中降粘剂的不足，减少绿色气体CO ₂的体积。_{然而，CO 2}泡沫驱与降粘剂相结合的机理仍不清楚。针对这一问题，对降粘剂辅助CO ₂泡沫驱过程中稠油的流动特性和剩余油状态进行了分析。本研究采用蚀刻微玻璃和高温高压位移可视化装置来模拟CO ₂泡沫和降粘剂稠油的流动行为。从宏观和微观角度观察并比较了不同溢流通道位置的蚀刻玻璃中残留油的状态和位置。实验结果表明如下。(i)降黏剂辅助CO ₂泡沫驱采收率前期上升明显，后期趋于缓慢上升。(ii)CO ₂泡沫降粘剂溶液可以堵塞水道，调节流线，使水驱前沿均匀推进。波及范围向两侧扩大，上扫区还形成有效的油水流动通道。(iii)由于CO ₂与泡沫状降粘剂的协同降粘作用，油水界面张力降低，原油粘度大幅下降，原油在孔隙中的流动能力显着提高。采收率提高43.2%证实了CO ₂泡沫降粘剂的驱油效果。

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Study of the Enhanced Oil Recovery Mechanism and Remaining Oil State of Heavy Oil after Viscosity-Reducer-Assisted CO2 Foam Flooding: 2D Microvisualization Experimental Case

Although traditional viscosity-reducer-assisted water flooding can improve heavy oil recovery, it does not have a sufficient advantage over expanding the sweep range and advancing the displacement front deeply. The CO₂ foam can make up for the lack of a viscosity reducer very well in the flooding process and decrease the volume of green-gas CO₂. However, the mechanism of combining the flooding of CO₂ foam with a viscosity reducer is still unclear. To solve this problem, the flow characteristics and remaining oil state of heavy oil in the process of CO₂ foam flooding assisted by a viscosity reducer are analyzed. In this study, an etched microglass and high-temperature and high-pressure displacement visualization device are used to simulate the flow behavior of heavy oil derived by CO₂ foam and a viscosity reducer together. The state and location of the remaining oil in the etched glass are observed and compared at different flooding channel positions from macro and micro points of view. The experimental results show the following. (i) The oil recovery factor increases obviously in the early stage and tends to increase slowly in the later stage of CO₂ foam flooding assisted by a viscosity reducer. (ii) The CO₂ foam viscosity-reducer solution can block the water channel, adjust the streamline, and make the flooding front advance evenly. The sweep range expands to both sides, and an effective oil–water flow channel is also formed at the upsweep zone. (iii) Due to the synergistic viscosity reduction effect of CO₂ and a foamy viscosity reducer, the oil–water interfacial tension decreases, the viscosity of crude oil decreases greatly, and the flow ability of crude oil in the pore is significantly improved. The 43.2% increase in oil recovery confirmed the flooding effect of a CO₂ foam viscosity reducer.

更新日期：2023-11-18

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