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PROCESS-BASED APPROACH FOR THE DETECTION OF CO2 INJECTATE LEAKAGE

United States Patent Application

20150000374
A1
View the Complete Application at the US Patent & Trademark Office
The present invention includes a method for distinguishing between a natural source of deep gas and gas leaking from a CO.sub.2 storage reservoir at a near surface formation comprising: obtaining one or more surface or near surface geological samples; measuring a CO.sub.2, an O.sub.2, a CH.sub.4, and an N.sub.2 level from the surface or near surface geological sample; determining the water vapor content at or above the surface or near surface geological samples; normalizing the gas mixture of the CO.sub.2, the O.sub.2, the CH.sub.4, the N.sub.2 and the water vapor content to 100% by volume or 1 atmospheric total pressure; determining: a ratio of CO.sub.2 versus N.sub.2; and a ratio of CO.sub.2 to N.sub.2, wherein if the ratio is greater than that produced by a natural source of deep gas CO.sub.2 or deep gas methane oxidizing to CO.sub.2, the ratio is indicative of gas leaking from a CO.sub.2 storage reservoir.
Romanak, Katherine (Austin, TX), Bennett, Philip C. (Austin, TX)
14/ 317,836
June 27, 2014
STATEMENT OF FEDERALLY FUNDED RESEARCH [0002] This invention was made with U.S. Government support by the U.S. Department of Energy through the Office of the Governor of Texas (contract DE-FG04-90AL65847) and the National Energy Technology Laboratory (contract DE FG26-05NT42590) through the Southeast Regional Carbon Sequestration Partnership. The government has certain rights in this invention.