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Wettability impact on supercritical CO2 capillary trapping: Pore-scale visualization and quantification

Journal Article · · Water Resources Research
DOI:https://doi.org/10.1002/2017WR020721· OSTI ID:1469958
 [1];  [2];  [2];  [2]
  1. Wuhan Univ. of Technology (China). State Key Lab. of Water Resources and Hydropower Engineering Science; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Geosciences Division
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
How the wettability of pore surfaces affects supercritical (sc) CO2 capillary trapping in geologic carbon sequestration (GCS) is not well understood, and available evidence appears inconsistent. Using a high-pressure micromodel-microscopy system with image analysis, we studied the impact of wettability on scCO2 capillary trapping during short-term brine flooding (80 s, 8–667 pore volumes). Experiments on brine displacing scCO2 were conducted at 8.5 MPa and 45°C in water-wet (static contact angle $$\theta$$ $20° ± 8°$) and intermediate-wet ($$\theta$$ $94° ± 13°$) homogeneous micromodels under four different flow rates (capillary number Ca ranging from 9 x 10-6 to 8 x 10-4) with a total of eight conditions (four replicates for each). Brine invasion processes were recorded and statistical analysis was performed for over 2000 images of scCO2 saturations, and scCO2 cluster characteristics. The trapped scCO2 saturation under intermediate-wet conditions is 15% higher than under water-wet conditions under the slowest flow rate (Ca 9 x 10-6). Based on the visualization and scCO2 cluster analysis, we show that the scCO2 trapping process in our micromodels is governed by bypass trapping that is enhanced by the larger contact angle. Smaller contact angles enhance cooperative pore filling and widen brine fingers (or channels), leading to smaller volumes of scCO2 being bypassed. Increased flow rates suppress this wettability effect.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Nanoscale Control of Geologic CO2 (NCGC); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC), Beijing (China); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Washington, DC (United States)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1469958
Alternate ID(s):
OSTI ID: 1580093
Journal Information:
Water Resources Research, Journal Name: Water Resources Research Journal Issue: 8 Vol. 53; ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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