Al-Kindi Ilyas, Babadagli Tayfun
Department of Civil and Environmental Engineering, School of Mining and Petroleum Engineering, University of Alberta, 7-277 Donadeo Innovation Centre for Engineering, 9211-116th Street, Edmonton, AB, T6G 1H9, Canada.
Sci Rep. 2021 Mar 22;11(1):6573. doi: 10.1038/s41598-021-86075-8.
The thermodynamics of fluids in confined (capillary) media is different from the bulk conditions due to the effects of the surface tension, wettability, and pore radius as described by the classical Kelvin equation. This study provides experimental data showing the deviation of propane vapour pressures in capillary media from the bulk conditions. Comparisons were also made with the vapour pressures calculated by the Peng-Robinson equation-of-state (PR-EOS). While the propane vapour pressures measured using synthetic capillary medium models (Hele-Shaw cells and microfluidic chips) were comparable with those measured at bulk conditions, the measured vapour pressures in the rock samples (sandstone, limestone, tight sandstone, and shale) were 15% (on average) less than those modelled by PR-EOS.
由于表面张力、润湿性和孔隙半径的影响（如经典开尔文方程所述），受限（毛细管）介质中流体的热力学与整体条件不同。本研究提供了实验数据，表明毛细管介质中丙烷蒸气压与整体条件下的偏差。还与彭 - 罗宾逊状态方程（PR - EOS）计算的蒸气压进行了比较。虽然使用合成毛细管介质模型（赫勒 - 肖槽和微流控芯片）测量的丙烷蒸气压与在整体条件下测量的相当，但岩石样品（砂岩、石灰岩、致密砂岩和页岩）中测量的蒸气压平均比PR - EOS模型预测的值低15%。
