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Impact of Confining Stress on Capillary Pressure Behavior During Drainage Through Rough Fractures

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2019gl082744· OSTI ID:1612956
 [1];  [2];  [3];  [4];  [5]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); DOE/OSTI
  2. Univ. of Minnesota, Twin Cities, MN (United States)
  3. Wuhan Univ. (China)
  4. Technical Univ. of Madrid (Spain); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

In this work we study, numerically, the behavior of capillary pressure $$(P_c)$$ during slow immiscible displacement in a rough fracture as a function of the degree of fracture aperture heterogeneity that results from two distinct mechanisms: normal confining stress and fracture surface correlation. We generate synthetic self-affine rough fractures at different correlation scales, solve the elastic contact problem to model the effect of confining stress, and simulate slow immiscible displacement of a wetting fluid by a nonwetting one using a modified invasion percolation model that accounts for in-plane curvature of the fluid-fluid interface. Our modeling results indicate that the power spectral density, $S(f)$, of $$P_c$$, can be used to qualitatively characterize fracture aperture heterogeneity. We show that the distribution of forward avalanche sizes follows a power law $$N_f (S_f)$$ ∝ $$S^{-a}_f$$ , with exponent $$α$$ = 2, in agreement with previously reported values for porous media and equal to the expected theoretical exponent for a self-organized criticality process.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Korea Ministry of Environment (MOE); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0018357
OSTI ID:
1612956
Alternate ID(s):
OSTI ID: 1542668
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 13 Vol. 46; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Roughness Control on Multiphase Flow in Rock Fractures journal November 2019

Figures / Tables (4)


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