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Title: Experimental study of drying effects during supercritical CO2 displacement in a pore network

Abstract

Underground storage in geological aquifers is one of the most important options for large-scale mitigation of CO2. During the supercritical CO2 (scCO2) injection process, water dissolved in scCO2 may have significant impact on the displacement process. In this study, a series of wet scCO2 (WscCO2, 100% water saturation) and dry scCO2 (DscCO2, 0% water saturation) displacement experiments were conducted in micromodels for a large range of flowrates. The displacement was visualized using fluorescence microscopy. Results showed that DscCO2 saturations were up to 3.3 times larger than WscCO2 saturations when the capillary fingering dominated the displacement. And the specific interfacial areas and mobile fractions for the DscCO2 displacements were also much larger than those for WscCO2. The capillary forces combined with drying effects are identified as the leading causes for the considerably higher DscCO2 sweep efficiency. Results from this study showed the important impact of mutual solubility of scCO2 and water on the displacement process and saturation of scCO2 (SscCO2), suggesting that the conventional model describing the relationship between capillary pressure and SscCO2 need to be modified for the effect of the mutual dissolution of multiple phases to more adequately describe the scCO2 displacement process in saline aquifer formation.

Authors:
 [1];  [2];  [3];  [3]; ORCiD logo [3];  [2];  [1]; ORCiD logo [3]
  1. Southwest Petroleum University
  2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
  3. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1556872
Report Number(s):
PNNL-SA-137617
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Microfluidics and Nanofluidics
Additional Journal Information:
Journal Volume: 22; Journal Issue: 9
Country of Publication:
United States
Language:
English

Citation Formats

Wang, Ying, Wei, Ning, Zhang, Changyong, Wietsma, Thomas W., Bonneville, Alain H., Li, Xiaochun, Li, Min, and Wang, Zheming. Experimental study of drying effects during supercritical CO2 displacement in a pore network. United States: N. p., 2018. Web. doi:10.1007/s10404-018-2122-9.
Wang, Ying, Wei, Ning, Zhang, Changyong, Wietsma, Thomas W., Bonneville, Alain H., Li, Xiaochun, Li, Min, & Wang, Zheming. Experimental study of drying effects during supercritical CO2 displacement in a pore network. United States. doi:10.1007/s10404-018-2122-9.
Wang, Ying, Wei, Ning, Zhang, Changyong, Wietsma, Thomas W., Bonneville, Alain H., Li, Xiaochun, Li, Min, and Wang, Zheming. Sat . "Experimental study of drying effects during supercritical CO2 displacement in a pore network". United States. doi:10.1007/s10404-018-2122-9.
@article{osti_1556872,
title = {Experimental study of drying effects during supercritical CO2 displacement in a pore network},
author = {Wang, Ying and Wei, Ning and Zhang, Changyong and Wietsma, Thomas W. and Bonneville, Alain H. and Li, Xiaochun and Li, Min and Wang, Zheming},
abstractNote = {Underground storage in geological aquifers is one of the most important options for large-scale mitigation of CO2. During the supercritical CO2 (scCO2) injection process, water dissolved in scCO2 may have significant impact on the displacement process. In this study, a series of wet scCO2 (WscCO2, 100% water saturation) and dry scCO2 (DscCO2, 0% water saturation) displacement experiments were conducted in micromodels for a large range of flowrates. The displacement was visualized using fluorescence microscopy. Results showed that DscCO2 saturations were up to 3.3 times larger than WscCO2 saturations when the capillary fingering dominated the displacement. And the specific interfacial areas and mobile fractions for the DscCO2 displacements were also much larger than those for WscCO2. The capillary forces combined with drying effects are identified as the leading causes for the considerably higher DscCO2 sweep efficiency. Results from this study showed the important impact of mutual solubility of scCO2 and water on the displacement process and saturation of scCO2 (SscCO2), suggesting that the conventional model describing the relationship between capillary pressure and SscCO2 need to be modified for the effect of the mutual dissolution of multiple phases to more adequately describe the scCO2 displacement process in saline aquifer formation.},
doi = {10.1007/s10404-018-2122-9},
journal = {Microfluidics and Nanofluidics},
number = 9,
volume = 22,
place = {United States},
year = {2018},
month = {9}
}

Works referenced in this record:

CO2-H2O mixtures in the geological sequestration of CO2. I. Assessment and calculation of mutual solubilities from 12 to 100°C and up to 600 bar
journal, August 2003

  • Spycher, Nicolas; Pruess, Karsten; Ennis-King, Jonathan
  • Geochimica et Cosmochimica Acta, Vol. 67, Issue 16, p. 3015-3031
  • DOI: 10.1016/S0016-7037(03)00273-4