... Abstract Currently, the methods of nanofluidic chip and molecular dynamics simulation have been widely applied to characterize the effect of nanoscale confinement on the fluid phase behavior in shale rocks. However, most of the published literatures just concentrate on the pure nanoscale pores...

... Abstract Building a robust PVT model critically relies on accurate phase behavior data which has been traditionally obtained using PVT cells. While the PVT cell can provide accurate data, it requires a large volume of downhole or recombined samples which are usually expensive to collect...

... Abstract State-of-the-art chemical flooding simulators typically use nonpredictive phase behavior and property models to design a surfactant flood. For example, a variation of the black-oil model is often used to represent phase behavior in several commercial simulators. We examine...

...Phase behavior modeling of alkali/surfactant/crude oil systems Modeling the phase behavior of the oil/brine/surfactant system is a challenging process. The Hand's rule is a classic empirical method which describes the binodal curves and tie lines. Many research studies and numerical simulation...

.... In recent years, CO 2 huff-and-puff has been widely applied to unlock the shale reservoirs. But on account of the high adsorption selectivity of CO 2 , after the injection of CO 2 , the original vapor-liquid equilibria of hydrocarbons is changed. The purpose of this study is to predict the phase behavior...

... mobilization of trapped oil, while also avoiding formation of gel/viscous microemulsions. This paper investigates the potential field application of injecting alkali to generate in situ soap and favorable phase behavior for a high TAN oil. Oil analysis results show that the acids in the crude are a complex...

... temperature and increased critical density are observed under confinement. In addition, the effect of fluid-solid interaction strength on phase behavior is studied. It is found that a larger fluid-solid force leads to a more heterogenous density distribution in nanopores. However, the average liquid/vapor...

... Abstract The phase behavior shifts of hydrocarbons confined in nanopores have been extensively verified with experiments and molecular dynamics simulations. However, the impact of confinement on large-scale reservoir production is not fully understood. This work is to put forward a valid method...

... salinity is lower than 5 wt% NaCl solution. A surfactant solution was considered aqueous stable if it remained as a clear homogeneous single-phase solution after equilibration at a given temperature. Phase behavior experiments Fixed volumes of oil and surfactant solution were mixed in pipettes...

...-temperature (PVT) analysis procedures that are employed in conventional reservoirs are also applicable to shale and tight reservoirs. However, traditional PVT analysis does not account for the nanoporosity of the shale and, therefore, neglects the ability of nanopores to significantly alter the phase behavior...

... Abstract Co-solvents are used with surfactants in modern chemical enhanced oil recovery (CEOR) formulations to avoid formation of viscous microemulsion phases (and reduce costs) in porous media. Modeling the effect of co-solvents on phase behavior is critical to CEOR reservoir simulations...

... Abstract Phase behavior of hydrocarbons in confined nanopores is quite different from that of the bulk. In confined space, the high capillary pressure between vapor phase and liquid phase, and depressed critical properties under confinement will all affect the in-situ phase behavior. According...

...-rich shale reservoirs are known to possess a broad pore size distribution. In macropores and fractures, the porous geometries are in the size of micrometers. However, in organic matter, a significant amount of porosity consists of nanopores. In the nanopores, the fluid phase behavior deviates from...

... of LSW process at field scale. The phase behavior of an oil-water-microemulsion system was modeled without the need of modeling type III microemulsion explicitly. The approach has been successfully applied to model both conventional Alkaline-Surfactant-Polymer (ASP) flooding and emerging EOR processes...

..., and mineralogy on phase behavior of fluids confined in nanopores of tight formations has been studied by many researchers ( Salahshoor et al., 2018 ). Phase behavior alterations as a result of confinement require very careful consideration and management so as to avoid possible irreversible losses...

... Abstract Phase behavior of hydrocarbon mixtures is affected by the petrophysical properties of the formation. This paper integrates several important thermodynamic and petrophysical aspects of the problem in a rigorous way, and introduces a solution that can be applied over the range of pore...

... Abstract Pore diameters for shale reservoirs are on the order of few nanometers which become even smaller during production because of rock deformation. This dynamic interaction between pore fluid pressure and rock stress affects the phase behavior in unconventional reservoirs. In this paper...

.... slug size heterogeneity incremental efficiency surfactant chemical flooding methods concentration Simulation recovery phase behavior model enhanced recovery incremental oil SP slug numerical dispersion reservoir Upstream Oil & Gas Phase Behavior waterflood recovery factor Oil...

... Abstract The phase behavior of reservoir fluids plays a fundamental role in predicting well performance and ultimate recovery. Currently, the uncertainty in phase behavior is one of the greatest challenges in developing unconventional shale resources. The complex phase behavior is attributed...

... Abstract Recent studies on phase behavior in nanopore confinement reveal inconsistent and contradicting results about the shift of the phase diagram and critical point. This paper focuses on statistical mechanics and molecular simulation to model the PVT behavior in confinement. Grand Canonical...