Patent ID: 7588943
Filing Date: 2009-09-15
Classification: E21B,G01N,Y02C,Y10T

Abstract:
1. A method for quantitative monitoring of a gas injected into an underground reservoir, likely to react chemically with the underground reservoir, comprising: selecting a tracer gas whose chemical inertness is total, wherein the tracer gas is a rare gas unlikely to be contaminated by contact of the mixture with the underground reservoir, and which has solubility in water and diffusion coefficient as close as possible to those of the gas injected; injecting into the reservoir a mixture of the gas with an initial proportion of the tracer gas; measuring a variation with time of the proportion of tracer gas in the mixture, after injection of the mixture; and determining a quantity of the gas that may have disappeared when the gas reacts chemically with the underground reservoir, from the measured variation of the proportion of the tracer gas with time as compared to the initial proportion.