A critical review of CO2 enhanced oil recovery in tight oil reservoirs of North America and China

Methane (CH4) wettability of shale is a key parameter which determines pore and reservoir-scale fluid distributions, CH4 reserves estimation, and ultimate recovery efficiency from shale gas reservo...

Methane (CH4) Wettability of Clay-Coated Quartz at Reservoir Conditions

The wetting characteristics of shale rocks at representative subsurface conditions remain an area of active debate. A precise characterization of shale wettability is essential for enhanced oil and...

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Shale wettability: Data sets, challenges, and outlook

We perform molecular dynamics simulation study of CO2, methane, and their mixture in the presence of brine over a broad range of temperature (311–473 K), pressure (up to about 100 MPa), and NaCl concentration (up to about 14 wt %). The general decrease in the interfacial tension (IFT) values of the CH4–brine system with pressure and temperature is similar to that obtained for the corresponding CH4–water system. The IFT of methane and brine is a linearly increasing function of salt concentration, and the resulting slopes are dependent on the pressure. A similar behavior as methane is observed for such systems containing CO2 and CO2–CH4 mixture. The IFT of CO2 and brine increases linearly with increasing salt content; however, the resulting slopes are independent of pressure. The simulations show that the presence of CO2 decreases the IFT values of the CH4–water and CH4–brine systems, but the degree of reduction depends on the amount of CO2 in each sample, which is consistent with experimental evidence. The...

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Molecular Dynamics Simulation Study of Carbon Dioxide, Methane, and Their Mixture in the Presence of Brine

Adsorption/desorption isotherms of CH4 and C2H6 on typical shale samples

Supercritical CO2 injection is a promising way to hydraulically fracture tight/shale gas formations as well as enhance gas recovery from these formations. Understanding of phase behavior and interfacial tension (IFT) of CO2/CH4/brine (NaCl) systems is important, because they affect the performance of such a process in tight/shale gas formations. In this study, we employ the axisymmetric drop shape analysis (ADSA) method to measure the IFT between CO2/CH4 mixtures and brine over the temperature range from 77.0 to 257.0 °F and the pressure range from 15 to 5027 psia. Test results show that the presence of CO2 decreases the IFT of CH4/H2O or CH4/brine (NaCl) systems, while the degree of reduction depends on the molar fraction of CO2 in the gas mixture. Salinity tends to cause an increase in IFT of CO2/CH4/brine (NaCl) systems; a higher salinity leads to an increased IFT for a given system. On the basis of the Parachor model (Weinaug and Katz J. Ind. Eng. Chem. 1943, 35, 239) and Firoozabadi’s model (Firoozab...

Yueliang Liu

Papers

Measurements and Modeling of Interfacial Tension for CO2/CH4/Brine Systems under Reservoir Conditions

Experimental study on methane hydrate formation in a partially saturated sandstone using low-field NMR technique

Competitive adsorption behavior of hydrocarbon(s)/CO2 mixtures in a double-nanopore system using molecular simulations

Using propanol as an additive to CO2 for improving CO2 utilization and storage in oil reservoirs

Absolute adsorption of light hydrocarbons on organic-rich shale: An efficient determination method