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Title: EGS rock reactions with Supercritical CO2 saturated with water and water saturated with Supercritical CO2
Creator/Author: Earl D. Mattson ; Travis L. McLing ; William Smith ; Carl Palmer
Publication Date:2013 Feb 01
OSTI Identifier:OSTI 1076541
Report Number(s):INL/CON-12-27569
DOE Contract Number:DE-AC07-05ID14517
Document Type:Conference
Specific Type:
Resource Relation:Conference: Stanford Geothermal Workshop,Stanford CA,02/11/2013,02/13/2013
Other Number(s):
Research Org:Idaho National Laboratory (INL)
Sponsoring Org:DOE - EE
Keywords:EGS; geothermal; SCCO2
Description/Abstract:EGS using CO2 as a working fluid will likely involve hydro-shearing low-permeability hot rock reservoirs with a water solution. After that process, the fractures will be flushed with CO2 that is maintained under supercritical conditions (> 70 bars). Much of the injected water in the main fracture will be flushed out with the initial CO2 injection; however side fractures, micro fractures, and the lower portion of the fracture will contain connate water that will interact with the rock and the injected CO2. Dissolution/precipitation reactions in the resulting scCO2/brine/rock systems have the potential to significantly alter reservoir permeability, so it is important to understand where these precipitates form and how are they related to the evolving ‘free’ connate water in the system. To examine dissolution / precipitation behavior in such systems over time, we have conducted non-stirred batch experiments in the laboratory with pure minerals, sandstone, and basalt coupons with brine solution spiked with MnCl2 and scCO2. The coupons are exposed to liquid water saturated with scCO2 and extend above the water surface allowing the upper portion of the coupons to be exposed to scCO2 saturated with water. The coupons were subsequently analyzed using SEM to determine the location of reactions in both in and out of the liquid water. Results of these will be summarized with regard to significance for EGS with CO2 as a working fluid.
Country of Publication:US
Size/Format:Medium: ED
System Entry Date:2013 Apr 25
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