Capillary Pressure–Saturation Relations for Supercritical CO 2 and Brine in Limestone/Dolomite Sands: Implications for Geologic Carbon Sequestration in Carbonate Reservoirs
Abstract
In geologic carbon sequestration, capillary pressure (Pc)–saturation (Sw) relations are needed to predict reservoir processes. Capillarity and its hysteresis have been extensively studied in oil–water and gas–water systems, but few measurements have been reported for supercritical (sc) CO2–water. Here, Pc–Sw relations of scCO2 displacing brine (drainage), and brine rewetting (imbibition) were studied to understand CO2 transport and trapping behavior under reservoir conditions. Hysteretic drainage and imbibition Pc–Sw curves were measured in limestone sands at 45 °C under elevated pressures (8.5 and 12.0 MPa) for scCO2–brine, and in limestone and dolomite sands at 23 °C (0.1 MPa) for air–brine using a new computer programmed porous plate apparatus. scCO2–brine drainage and imbibition curves shifted to lower Pc relative to predictions based on interfacial tension, and therefore deviated from capillary scaling predictions for hydrophilic interactions. Fitting universal scaled drainage and imbibition curves show that wettability alteration resulted from scCO2 exposure over the course of months-long experiments. Residual trapping of the nonwetting phases was determined at Pc = 0 during imbibition. Amounts of trapped scCO2 were significantly larger than for those for air, and increased with pressure (depth), initial scCO2 saturation, and time. These results have important implications for scCO2 distribution, trapping, and leakagemore »
- Authors:
-
- Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Center for Nanoscale Control of Geologic CO2 (NCGC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1183244
- Alternate Identifier(s):
- OSTI ID: 1386022
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Published Article
- Journal Name:
- Environmental Science and Technology
- Additional Journal Information:
- Journal Name: Environmental Science and Technology Journal Volume: 49 Journal Issue: 12; Journal ID: ISSN 0013-936X
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Bio-inspired; Mechanical behavior; Carbon sequestration; Saturation; Atmospheric chemistry; Wetting; Hysteresis; Fluids
Citation Formats
Wang, Shibo, and Tokunaga, Tetsu K. Capillary Pressure–Saturation Relations for Supercritical CO 2 and Brine in Limestone/Dolomite Sands: Implications for Geologic Carbon Sequestration in Carbonate Reservoirs. United States: N. p., 2015.
Web. doi:10.1021/acs.est.5b00826.
Wang, Shibo, & Tokunaga, Tetsu K. Capillary Pressure–Saturation Relations for Supercritical CO 2 and Brine in Limestone/Dolomite Sands: Implications for Geologic Carbon Sequestration in Carbonate Reservoirs. United States. https://doi.org/10.1021/acs.est.5b00826
Wang, Shibo, and Tokunaga, Tetsu K. Mon .
"Capillary Pressure–Saturation Relations for Supercritical CO 2 and Brine in Limestone/Dolomite Sands: Implications for Geologic Carbon Sequestration in Carbonate Reservoirs". United States. https://doi.org/10.1021/acs.est.5b00826.
@article{osti_1183244,
title = {Capillary Pressure–Saturation Relations for Supercritical CO 2 and Brine in Limestone/Dolomite Sands: Implications for Geologic Carbon Sequestration in Carbonate Reservoirs},
author = {Wang, Shibo and Tokunaga, Tetsu K.},
abstractNote = {In geologic carbon sequestration, capillary pressure (Pc)–saturation (Sw) relations are needed to predict reservoir processes. Capillarity and its hysteresis have been extensively studied in oil–water and gas–water systems, but few measurements have been reported for supercritical (sc) CO2–water. Here, Pc–Sw relations of scCO2 displacing brine (drainage), and brine rewetting (imbibition) were studied to understand CO2 transport and trapping behavior under reservoir conditions. Hysteretic drainage and imbibition Pc–Sw curves were measured in limestone sands at 45 °C under elevated pressures (8.5 and 12.0 MPa) for scCO2–brine, and in limestone and dolomite sands at 23 °C (0.1 MPa) for air–brine using a new computer programmed porous plate apparatus. scCO2–brine drainage and imbibition curves shifted to lower Pc relative to predictions based on interfacial tension, and therefore deviated from capillary scaling predictions for hydrophilic interactions. Fitting universal scaled drainage and imbibition curves show that wettability alteration resulted from scCO2 exposure over the course of months-long experiments. Residual trapping of the nonwetting phases was determined at Pc = 0 during imbibition. Amounts of trapped scCO2 were significantly larger than for those for air, and increased with pressure (depth), initial scCO2 saturation, and time. These results have important implications for scCO2 distribution, trapping, and leakage potential.},
doi = {10.1021/acs.est.5b00826},
journal = {Environmental Science and Technology},
number = 12,
volume = 49,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 2015},
month = {Mon Jun 01 00:00:00 EDT 2015}
}
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https://doi.org/10.1021/acs.est.5b00826
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