Bubble/dew point and hysteresis of hydrocarbons in nanopores from molecular perspective

被引:44
作者
Jin, Zhehui [1 ]
机构
[1] Univ Alberta, Sch Min & Petr Engn, Dept Civil & Environm Engn, Edmonton, AB T6G 1H9, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Phase behavior in nanopores; Grand canonical Monte Carlo simulation; Density functional theory; Shale; Bubble/dew point; Hydrocarbons; DENSITY-FUNCTIONAL THEORY; EQUATION-OF-STATE; PHASE-EQUILIBRIA; MCM-41; SILICA; SHALE GAS; N-ALKANES; ADSORPTION; SIMULATION; BEHAVIOR; CONFINEMENT;
D O I
10.1016/j.fluid.2017.11.022
中图分类号
O414.1 [热力学];
学科分类号
摘要
The effect of nano-confinement on the thermodynamic behavior and saturation properties of petroleum fluids in nanoporous media are important parameters for shale gas/oil production. Confined petroleum fluids can have hysteresis and bubble/dew point behaviors can be very different depending on the thermodynamic route. In this work, we use grand canonical Monte Carlo (GCMC) simulations and engineering density functional theory (DFT) to study the effect of pressure, temperature, and nanopore sizes on the bubble/dew point and hysteresis of hydrocarbons in nanopores. By comparing to GCMC simulations, engineering DFT reliably predicts the vapor-liquid equilibrium of confined hydrocarbon, fluids. We also find that dew point of pure confined fluids approaches bulk saturation point as pore size increases, but bubble point can be very different from bulk even for very large pores. As a result, the hysteresis between bubble and dew points increases with pore size. For single-component, the hysteresis decreases as pressure approaches critical pressure. For binary mixtures, the dependence of hysteresis on temperature is dependent on the pore sizes. The cricondentherm point of confined mixtures is shifted toward higher temperatures comparing to the bulk. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:177 / 185
页数:9
相关论文
共 39 条
  • [1] Al-Kindi I., 2017, SPE ANN TECHN C EXH
  • [2] Alfi M., 2017, SPE ANN TECHNICAL C
  • [3] Curvature Dependence of the Liquid-Vapor Surface Tension beyond the Tolman Approximation[J]. Bruot, Nicolas;Caupin, Frederic. PHYSICAL REVIEW LETTERS, 2016(05)
  • [4] Civan F., 2013, SPE UNC RES C CAN SO
  • [5] Theoretical Fundamentals, Critical Issues, and Adequate Formulation of Effective Shale Gas and Condensate Reservoir Simulation[J]. Civan, Faruk;Devegowda, Deepak;Sigal, Richard. POROUS MEDIA AND ITS APPLICATIONS IN SCIENCE, ENGINEERING, AND INDUSTRY, 2012
  • [6] DENSITY-FUNCTIONAL THEORY OF SIMPLE CLASSICAL FLUIDS .1. SURFACES[J]. EBNER, C;SAAM, WF;STROUD, D. PHYSICAL REVIEW A, 1976(06)
  • [7] NEW PHASE-TRANSITION PHENOMENA IN THIN ARGON FILMS[J]. EBNER, C;SAAM, WF. PHYSICAL REVIEW LETTERS, 1977(25)
  • [8] A new intermolecular potential model for the n-alkane homologous series[J]. Errington, JR;Panagiotopoulos, AZ. JOURNAL OF PHYSICAL CHEMISTRY B, 1999(30)
  • [9] FINDENEGG GH, 1994, STUD SURF SCI CATAL, V87, P71
  • [10] Firoozabadi A., 2015, THERMODYNAMICS APPL, Vfirst