CO2 activating hydrocarbon transport across nanopore throat: insights from molecular dynamics simulation.
CO2 activating hydrocarbon transport across nanopore throat: insights from molecular dynamics simulation.
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DOI：
10.1039/c7cp05759h
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
Youguo Yan;Zihan Dong;Yingnan Zhang;Pan Wang;Timing Fang;Jun Zhang
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文献类型：
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作者：
Youguo Yan;Zihan Dong;Yingnan Zhang;Pan Wang;Timing Fang;Jun Zhang
致密油藏中，纳米孔喉作为流体通道最窄的一段，决定了原油的运移性能；注入CO2对原油的流动有显著的促进作用。尽管作出了大量努力，但上述现象的潜在传输机制仍不清楚。采用分子动力学模拟方法，研究了石油在纳米孔喉道中的输运过程。由构象变形、油/孔相互作用和Jamin效应形成的高能垒阻碍了原油的运移。CO_2对原油运移有激活作用，且与CO_2的量成正比。从原油溶胀、界面张力和表面滑移等方面对其内在机理进行了详细的阐述。我们的研究为了解石油在纳米孔喉道中的运移和CO2的活化效应提供了基础；研究结果在CO2驱提高采收率方面具有很好的应用前景。
In tight oil reservoirs, nanopore throat acting as the narrowest section of fluidic channel determines the oil transport performance; injecting CO2 is found to significantly promote the oil flow. Despite substantial efforts, the underlying transport mechanism of above phenomenon remains unclear. Employing molecular dynamics simulation, the oil transport through a nanopore throat is studied. A high energy barrier derived of conformation deformation, oil/pore interaction and Jamin effect is found to impede the oil transport. The CO2 activating effect for oil transport is present, and a dependence on CO2 amount is observed. The underlying mechanism was well documented from the aspects of oil swelling, interfacial tension and surface sliding. Our study provides fundamental insight into the oil transport across nanopore throat and CO2 activating effect; the results have promising applications in enhanced oil recovery in CO2 flooding.