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Title: Water contact angles on quartz surfaces under supercritical CO2 sequestration conditions: Experimental and molecular dynamics simulation studies

Journal Article · · International Journal of Greenhouse Gas Control
 [1];  [2];  [1];  [1]
  1. Dalian University of Technology (China)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

The ambiguity of contact angle experimental measurements due to surface chemistry changes resulted from sample contamination and/or the degrees of reaction with supercritical CO2 has resulted in great difficulties to precisely understand the wetting behavior of CO2 under the geological carbon sequestration (GCS) conditions. Water contact angles on quartz surface under GCS conditions were investigated through the combined experimental and molecular dynamics simulation (MDS) methods. The experimental results show that water contact angles increases as ionic strength increases. The effects of pressure and temperature are very weak. The dependence of ionic strength, pressure and temperature is same for monovalent and divalent ions solutions. In the MDS, a hydroxylated quartz surface was used as the base point. A good agreement between the MDS and experimental results were obtained. Using the MDS method, a clean mineral surface with a desired surface chemistry can be constructed, which is difficult in experiments. So by comparing MDS and experimental results, the mechanisms of the reservoir wettability can be better understood. Further investigation can be made on quartz surface with different functional groups to better understand wettability alteration caused by contamination and/or CO2 reaction.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Nanoscale Control of Geologic CO2 (NCGC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Doctoral Startup Funds of Liaoning Province (China); Fundamental Research Funds for the Central Universities (China); China Scholarship Council
Grant/Contract Number:
AC02-05CH11231; 51206016; 20121021; DUT14LAB13
OSTI ID:
1506244
Alternate ID(s):
OSTI ID: 1251648
Journal Information:
International Journal of Greenhouse Gas Control, Vol. 42; ISSN 1750-5836
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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