Poromechanics Constitutive Relations and Analytical Solution for Nonlinear Gas Transport and Sorption in Deformable Rocks

Zhang, Wei; Mehrabian, Amin

doi:10.1007/s11242-023-01990-w

Cited by 1 publication

(1 citation statement)

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“…In addition, further study with larger-scale and longer-time simulations is still required to close the gap between the nanopore scale and real pore-network scale. The simulation to pore-scale and with consideration of possible swelling effects as CO 2 -fracking, for instance, is known to affect kerogen and reduce shale permeability. , Furthermore, the salinity effects on oil movability in realistic systems with various buried depths, complex fluids, complicated pore networks, and different surfaces need to be further evaluated.…”

Section: Resultsmentioning

confidence: 99%

Molecular Insights into the Salinity Effects on Movability of Oil–Brine in Shale Nanopore-Throat Systems

Cheng,

Lu,

et al. 2023

Langmuir

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Low-salinity flooding has been well recognized as a promising strategy to increase shale oil recovery, but the underlying mechanism remains unclarified, especially for complex nanopore networks filled with oil–brine fluids. In this study, the pressure-driven flow of an oil–brine fluid with varying salinities in shale nanopore-throat channels was first investigated based on molecular dynamics simulations. The critical pressure driving oil to intrude into a nanothroat filled with brine of varying salinities was determined. Simulation results indicate that the salinity of brine exhibits great effects on the movability of oil, and low salinity favors the increase of oil movability. Further analysis of the interactions between fluid and pore walls as well as the displacement pressures reveals dual effects of brine salinity on oil transportation in a nanopore-throat. On the one hand, hydrated cations anchoring onto throat walls enlarge the effective flow width in the throat before the hydration complexes reach the maximum. On the other hand, the interfacial tension between oil and brine increases with the brine salinity, which increases the capillary resistance and leads to a higher displacement pressure. These findings highlight the effects of brine salinity on oil movability in a nanopore-throat, which will promote the understanding of oil accumulation and dissipation in petroleum systems, as well as help to develop enhanced oil recovery.

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Section: Resultsmentioning

confidence: 99%