Department of Civil and Environmental Eng., School of Mining and Petroleum Engineering, 7-277 Donadeo Innovation Centre for Engineering, University of Alberta, 9211 - 116th Street, Edmonton, AB, T6G 1H9, Canada.
Sci Rep. 2023 Mar 18;13(1):4507. doi: 10.1038/s41598-023-31651-3.
Phase-alteration phenomenon has a considerable influence on the dynamics and distribution of fluids in porous media. One of the major factors affecting the phase behaviour of fluids in reservoirs is the capillarity effect, which becomes unavoidably significant as the media becomes tighter (confinement effect) and contains more pores at nano sizes. Comprehending the nature of vaporization and condensation of hydrocarbon in such confined media is important for accurate modelling of two-phase envelopes and thereby the performance of energy production from hydrocarbon reservoirs. This paper studies the vaporization of single- and multicomponent hydrocarbons in different types of rocks (namely sandstones, limestones, tight sandstones, and shales). The vaporization temperatures were measured experimentally in each rock type and compared with boiling points measured at bulk conditions to investigate the deviation between the phase-change temperatures in capillary media and bulk values. The deviation between the measured vaporization temperatures and the bulk measurements ranged from 4.4% (1.6% in Kelvin unit) to 19.7% (5.2% in Kelvin unit) with single-component solvents and 1.4% (0.4% in Kelvin unit) to 27.6% (5.3% in Kelvin unit) with the hydrocarbon mixtures. The vaporization temperatures, obtained from the experiments, were also compared with the computed two-phase envelopes, calculated by the classical Peng-Robinson Equation of State. The deviation percentages of measured vaporization temperatures from the computed values were at least 4.4% (1.6% in Kelvin unit) with single-component solvents and 2.1% (0.7% in Kelvin unit) with the hydrocarbon mixtures.
相变现象对多孔介质中流体的动力学和分布有很大的影响。影响储层中流体相行为的一个主要因素是毛细效应，当介质变得更紧密（约束效应）且包含更多纳米大小的孔隙时，毛细效应变得不可避免地显著。理解在这种受限介质中烃类的蒸发和凝结的性质对于准确模拟两相包络线以及从而从烃类储层中生产能源的性能是很重要的。本文研究了单组分和多组分烃在不同类型岩石（即砂岩、石灰岩、致密砂岩和页岩）中的蒸发。在每种岩石类型中都进行了实验测量蒸发温度，并与在整体条件下测量的沸点进行了比较，以研究在毛细介质中的相变换温度与整体值之间的偏差。测量的蒸发温度与整体测量值之间的偏差范围为 4.4%（1.6%在开尔文单位）到 19.7%（5.2%在开尔文单位），对于单组分溶剂，以及 1.4%（0.4%在开尔文单位）到 27.6%（5.3%在开尔文单位），对于烃混合物。从实验中获得的蒸发温度也与通过经典的 Peng-Robinson 状态方程计算的两相包络线进行了比较。测量的蒸发温度与计算值的偏差百分比至少为 4.4%（1.6%在开尔文单位），对于单组分溶剂，以及 2.1%（0.7%在开尔文单位），对于烃混合物。
