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Title: Connecting Pressure-Saturation and Relative Permeability Models to Fracture Properties: The Case of Capillary-Dominated Flow of Supercritical CO2 and Brine

Journal Article · · Water Resources Research
DOI:https://doi.org/10.1029/2018wr023526· OSTI ID:1539770

Abstract Fractures are potential pathways for subsurface fluids. In the context of geologic CO 2 sequestration, fractures could threaten the security of reservoirs since they are pathways for leakage. However, the constitutive equations describing the pressure‐saturation and relative permeability‐saturation, key inputs for flow modeling and prediction, are poorly understood for two‐phase fracture flow at the field scale where each fracture might be an element of a complex fracture network or dual‐porosity domain. This knowledge is required for the safe storage of CO 2 under potentially fractured caprocks. To address this, we numerically simulated two‐phase viscous flow through horizontal heterogeneous fractures across a broad range of roughness and aperture correlation length. The numerical experiments, which solved the modified local cubic law, showed a weak to strong phase interference during the drainage process; that is, supercritical CO 2 displaces brine if the imposed pressure + local viscous force > local capillary force. The drainage process ended when no new brine cells can be further invaded by CO 2 . Afterward, we froze the saturation field for each individual phase and calculated the relative permeability by single‐phase flow modeling. Thousands of simulated pressure‐saturation and relative permeability curves enabled us to estimate and connect the parameters of the Van‐Genuchten model and of the generalized ν‐type model to fracture roughness and aperture correlation length. This empirical connection will be useful for assessing and predicting immiscible two‐phase flow in horizontal rough fractures at the large scale.

Research Organization:
Energy Frontier Research Centers (EFRC), Washington, D.C. (United States). Center for Frontiers of Subsurface Energy Security (CFSES); Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0001114; DE‐SC0001114
OSTI ID:
1539770
Alternate ID(s):
OSTI ID: 1474750
Journal Information:
Water Resources Research, Vol. 54, Issue 9; ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (1)

Roughness Control on Multiphase Flow in Rock Fractures journal November 2019