Impact of Capillary Pressure and Nanopore Confinement on Phase Behaviors of Shale Gas and Oil

Zuo, Julian Y.; Guo, Xuqiang; Liu, Yansheng; Pan, Shu; Canas, Jesus Alberto; Mullins, Oliver C.

doi:10.1021/acs.energyfuels.7b03975

Cited by 85 publications

(27 citation statements)

References 37 publications

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“…The equilibrium relation between the pressures on the two sides of an interface can be expressed by well-known Young-Laplace equation as given below for a spherical meniscus in a cylindrical tube [37,38]:…”

Section: Effect Of Surface Tension Of the Fluids On Capillary Rise Dynamicsmentioning

confidence: 99%

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

et al. 2021

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Capillary-driven action is an important phenomenon which aids the development of high-performance heat transfer devices, such as microscale heat pipes. This study examines the capillary rise dynamics of n-butanol/water mixture in a single vertical capillary tube with different radii (0.4, 0.6, and 0.85 mm). For liquids, distilled water, n-butanol, and their blends with varying concentrations of butanol (0.3, 0.5, and 0.7 wt.%) were used. The results show that the height and velocity of the capillary rise were dependent on the tube radius and liquid surface tension. The larger the radius and the higher the surface tension, the lower was the equilibrium height (he) and the velocity of rise. The process of capillary rise was segregated into three characteristic regions: purely inertial, inertial + viscous, and purely viscous regions. The early stages (purely inertial and inertial + viscous) represented the characteristic heights h1 and h2, which were dominant in the capillary rise process. There were linear correlations between the characteristic heights (h1, h2, and he), tube radius, and surface tension. Based on these correlations, a linear function was established between each of the three characteristic heights and the consolidated value of tube radius and surface tension (σL/2πr2).

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Section: Effect Of Surface Tension Of the Fluids On Capillary Rise Dynamicsmentioning

confidence: 99%

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

et al. 2021

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“…In contrast, other researchers have used EOS parameters derived from the shifted critical properties of confined pure fluids, − resulting from theoretical works. , For such models, the calculated phase envelope of confined mixtures differs dramatically from that of the bulk phase, notably the displacement of the critical point. However, it should be noted that the trend of the shift of the critical point is not consistent among different studies.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Criticality of a Methane/Ethane Mixture Confined in Nanoporous Media

et al. 2019

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For the first time, the critical region of a methane/ethane mixture confined in nanoporous media (SBA-15) is experimentally investigated using differential scanning calorimetry with an isochoric cooling procedure. The results reveal that the supercritical region of the confined fluid mixture exists at a lower pressure than its counterpart in the bulk space. The shift of the critical region is dependent on the pore size, which is similar to that of pure fluids [Tan et al., J. Phys. Chem. C, 2019, 123, 9824–9830]. Specifically, compared to that in bulk, the shift is greater for smaller pore size. The heat of capillary condensation of this mixture is also discussed. The findings in this work would shed some light on the understanding of confined phase behavior, especially criticality, in investigations toward more complex confined mixtures encountered in practical engineering application, for example, oil and gas recovery from unconventional reservoirs.

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“…The correlations used for critical temperature and pressure versus pore radius are either analytical [28] or built from molecular simulation results [26,27]. The two methods of capillary pressure consideration and shift of critical properties are also applied together [20,29,30,31]. Other extensions of EOS have been proposed by including the pore/fluid interaction effect.…”

Section: Introductionmentioning

confidence: 99%

Phase behavior of hydrocarbons in nano-pores

Sobecki

Nieto‐Draghi

Lella

et al. 2019

Fluid Phase Equilibria

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Inside nanopores, solid-fluid interactions are of the same order of magnitude as intermolecular interactions of fluid molecules. This fact strongly modifies the thermodynamic properties of confined fluids with respect to bulk phases. Tight oil and shale gas reservoirs, where the proportion of micro (below 2 nm) and mesopores (between 2 and 50 nm) can reach more than 20% of the volume distribution, represent an environment with such problems and industrial challenges to hydrocarbon fluid pressure/volume/temperature (PVT) modeling. This study provides a detailed understanding of the thermodynamic behavior of confined fluid and reference data of the thermodynamic properties of pure components (methane, ethane, n-pentane, n-decane) and mixtures (methane/ethane, ethane/n-pentane) confined in graphite slit pores. Furthermore, a detailed explanation of the different pressures considered in a porous medium with nano-pores is given. The Gibbs Ensemble Monte Carlo (GEMC) NVT simulation is used for pure components instead of the more traditional Grand Canonical Monte Carlo ensemble (GCMC) simulation to get more precise results of liquid and vapor confined pressure avoiding the phase change location determination problem. The evolution of critical temperature and pressure versus pore radius is compared to literature correlations and confined vapor and liquid densities are calculated. A new and robust method in the GEMC ensemble called GEMC NPT Bubble point Monte Carlo (BPMC) completed with GEMC NVT simulations has been developed to get thermodynamic properties including pressures at equilibrium of confined mixtures. Pressure versus density diagrams, pressure versus molar fraction isotherms and examples of pressure versus temperature diagram for a specific composition are built. The phase envelope of the confined fluid is shifted and closes with respect to phase envelope of bulk fluid. The critical temperature and pressure are shifted from the bulk value to a lower value and the bubble point pressure is decreased as the dew point pressure is increased. With regards to the selectivity of the confined system compared to the bulk fluid, for the methane/ethane and ethane/n-pentane mixtures, the heavier component is preferentially adsorbed in the vapor phase and the lighter component is preferentially adsorbed in the liquid phase. All these results for pure components and mixtures provide relevant information concerning the understanding of the phase behavior in confined systems such as shale gas and tight oil reservoirs, emphasizing the difference from the bulk fluid. Furthermore all these data may be used as references for pore radius dependent equation of state (EOS) calibration.

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Impact of Capillary Pressure and Nanopore Confinement on Phase Behaviors of Shale Gas and Oil

Cited by 85 publications

References 37 publications

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

Experimental Study on the Criticality of a Methane/Ethane Mixture Confined in Nanoporous Media

Phase behavior of hydrocarbons in nano-pores

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