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Title: Enhancing residual trapping of supercritical CO 2 via cyclic injections: Cyclic Injections Enhance scCO 2 Trapping

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2016GL070304· OSTI ID:1508036
 [1];  [2];  [2]
  1. Oregon State Univ., Corvallis, OR (United States); Australian National Univ., Canberra, ACT (Australia)
  2. Oregon State Univ., Corvallis, OR (United States)

We utilize synchrotron x-ray tomographic imaging to investigate the pore-scale characteristics and residual trapping of supercritical CO2 (scCO2) over the course of multiple drainage-imbibition (D-I) cycles in Bentheimer sandstone cores. Capillary pressure measurements are paired with image-based saturation and connectivity metrics which describe the extent of drainage and subsequent residual (end of imbibition) scCO2 trapping. For the first D-I cycle, residual scCO2 trapping is suppressed due to high imbibition capillary number (Ca≈10-6); however, residual scCO2 trapping dramatically increases for subsequent D-I cycles carried out at the same Ca value. The magnitude of scCO2 trapping increase is hysteretic and depends on the relative extent of the sequential drainage processes. Increased trapping as a function of D-I cycle has not been observed in other similar mutli-cycle experiments; this suggests that chemical/geochemical reactions specific to our scCO2-brine-sandstone experimental system may play a factor in the observed flow, mobilization, and residual trapping of scCO2.

Research Organization:
Univ. of Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
FG02-94ER14466
OSTI ID:
1508036
Report Number(s):
DOE-UCHICAGO-14466-4
Journal Information:
Geophysical Research Letters, Vol. 43, Issue 18; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (3)

Enhancement of CO 2 trapping efficiency in heterogeneous reservoirs by water-alternating gas injection : Original Research Article: Enhancement of CO journal July 2018
Topological Persistence for Relating Microstructure and Capillary Fluid Trapping in Sandstones journal January 2019
Capillary Trapping of CO 2 in Sandstone Using Low Field NMR Relaxometry journal December 2019

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