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Tracing Coalbed Natural Gas - Coproduced Water Using Stable Isotopes of Carbon

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Water collected in the area of coal beds has strongly positive .delta..sup.13C.sub.DIC (12.Salinity. to 22.Salinity.) that is readily distinguished from the negative .delta..sup.13C of most surface and ground water (-8.Salinity. to -11.Salinity.). Furthermore, the DIC concentrations in coproduced water samples are also high (more than 100 mg C/L) compared to the 20 to 50 mg C/L in ambient surface and ground water of the region. The distinctively high .delta..sup.13C and DIC concentrations allow the identification of surface and ground water that have incorporated CBNG-coproduced water.
Sharma, Shikha (Laramie, WY), Frost, Carol (Laramie, WY)
12/ 921,661
March 10, 2009
[0002] This invention was made, at least in part, with the United States governmental support awarded by the U.S. Department of Energy Grant No. DE-FC26-06NT15568-Task 4. The United States Government has certain rights in this application.