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Laser-Induced Breakdown Spectroscopy of High-Pressure Carbonated Brine Solutions
Poster Title: Laser-Induced Breakdown Spectroscopy of High-Pressure Carbonated Brine Solutions
Submitted on 24 Feb 2014
Author(s): C. Goueguel, D. McIntyre, J. Singh , J. Jain, and A. Karamalidis
Affiliations: National Energy Technology Laboratory, URS, Carnegie Mellon University, Mississippi State University
This poster was presented at Pittcon 2014
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Poster Information
Abstract: The U.S. Department of Energy’s carbon capture and sequestration (CCS) program goals to reduce the emission of carbon dioxide (CO2) from anthropogenic sources will entail a great amount of cost and efforts and deep saline formations have great potential for geologic CO2 sequestration. To ensure the success of the program it is important that the carbon dioxide that is injected underground remains there (99% permanence over 1000 years). However, there are latent risks for which CO2-laden brine could migrate from the deep saline formations to shallower aquifers and potentially enhance the solubility of various aquifer constituents, including hazardous compounds. A number of CO2 monitoring techniques have been employed since the inception of the CCS program. The methods range from the injection of tracers, micro-seismic monitoring techniques, satellite imaging, aerial monitoring with gas sensors, and various optical techniques. Yet, one of the great challenges of these techniques is that they offer only detection of CO2 leakage long after it has been occurred, thus lacking the ability to provide fast and early detection.
In this study, we explore the possibility of using laser-induced breakdown spectroscopy (LIBS) for evaluating potential leaks (i.e., CO2/brine leakage) from the storage sites. The experiments were conducted in calcium chloride (CaCl2) solution at pressure of 10, 50 and 120 bar. To evaluate the direct effect of dissolved-CO2 on the intensity of Ca emission lines (422.67 and 393.37 nm), measurements were also performed in pure nitrogen (N2) gas, offering large water solubility contrast.
Summary: This work has demonstrated that detectable calcium signal can be obtained in CO2-water mixture at high pressure using LIBS technique. We found that increasing CO2 pressure up to 120 bar has a relatively minimal effect on the emission intensity of calcium with respect to pure N2. The obtained results suggest that LIBS has the potential to be developed as an in-situ chemical sensor for monitoring groundwater quality to detect leakage of sequestered CO2.References: Report abuse »
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