Methods and apparatus for measuring small leaks from carbon dioxide sequestration facilities
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United States of America Patent
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Jan 2, 2018
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app pub date -
Nov 14, 2016
filing date -
Nov 14, 2016
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Abstract
In one embodiment, a CO2 leak detection instrument detects leaks from a site (e.g., a CO2 sequestration facility) using rapid concentration measurements of CO2, O2 and optionally water concentration that are achieved, for example, using laser spectroscopy (e.g. direct absorption laser spectroscopy). Water vapor in the sample gas may not be removed, or only partially removed. The sample gas may be collected using a multiplexed inlet assembly from a plurality of locations. CO2 and O2 concentrations may be corrected based on the water concentration. A resulting dataset of the CO2 and O2 concentrations is analyzed over time intervals to detect any changes in CO2 concentration that are not anti-correlated with O2 concentration, and to identify a potential CO2 leak in response thereto. The analysis may include determining eddy covariance flux measurements of sub-surface potential carbon.
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