Confinement Correction to Mercury Intrusion Capillary Pressure of Shale Nanopores.
Confinement Correction to Mercury Intrusion Capillary Pressure of Shale Nanopores.
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DOI：
10.1038/srep20160
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发表时间：
2016-02-01
影响因子：
4.6
通讯作者：
Feng Q
中科院分区：
文献类型：
--
作者：
Wang S;Javadpour F;Feng Q
我们优化了分子动力学模型中的潜在参数，以重现具有调谐电位的宏观汞液滴的实验接触角。富含页岩纳米孔。从理论模型中预测的液滴，我们提出了一种技术，以纠正汞入侵毛细管压力（MICP）测量的纳米多孔材料（例如页岩）的测量。添加吸附的孔径分布，尤其是对半径小于5 nm的孔。随着44％的样本 - 包含较小孔的样本偏离更多。在页岩中可以从MICP获得。
We optimized potential parameters in a molecular dynamics model to reproduce the experimental contact angle of a macroscopic mercury droplet on graphite. With the tuned potential, we studied the effects of pore size, geometry, and temperature on the wetting of mercury droplets confined in organic-rich shale nanopores. The contact angle of mercury in a circular pore increases exponentially as pore size decreases. In conjunction with the curvature-dependent surface tension of liquid droplets predicted from a theoretical model, we proposed a technique to correct the common interpretation procedure of mercury intrusion capillary pressure (MICP) measurement for nanoporous material such as shale. Considering the variation of contact angle and surface tension with pore size improves the agreement between MICP and adsorption-derived pore size distribution, especially for pores having a radius smaller than 5 nm. The relative error produced in ignoring these effects could be as high as 44%—samples that contain smaller pores deviate more. We also explored the impacts of pore size and temperature on the surface tension and contact angle of water/vapor and oil/gas systems, by which the capillary pressure of water/oil/gas in shale can be obtained from MICP. This information is fundamental to understanding multiphase flow behavior in shale systems.