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Indirect measurement of diluents in a multi-component natural gas

United States Patent

March 7, 2006
View the Complete Patent at the US Patent & Trademark Office
A method of indirectly measuring the diluent (nitrogen and carbon dioxide) concentrations in a natural gas mixture. The molecular weight of the gas is modeled as a function of the speed of sound in the gas, the diluent concentrations in the gas, and constant values, resulting in a model equation. A set of reference gas mixtures with known molecular weights and diluent concentrations is used to calculate the constant values. For the gas in question, if the speed of sound in the gas is measured at three states, the three resulting expressions of molecular weight can be solved for the nitrogen and carbon dioxide concentrations in the gas mixture.
Morrow; Thomas B. (San Antonio, TX), Owen; Thomas E. (Helotes, TX)
Southwest Research Institute (San Antonio, TX)
10/ 809,097
March 25, 2004
GOVERNMENT LICENSE RIGHTS The U.S. Government has a paid-up license in this invention and the right in certain circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-FC21-96MC33033 for the U.S. Department of Energy.