Tracers in predetermined concentration ratios

Chemistry: physical processes – Physical processes – Crystallization

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Details

250259, 166252, 73155, E21B 4700, G01N 3324

Patent

active

040553990

ABSTRACT:
A method for tracing the flow of a plurality of fluid slugs injected into a subsurface formation using a number of tracers smaller than the number of fluid slugs. Single tracers are used in a number of fluid slugs equal to the number of tracers. In the remaining injected fluid slugs, combinations of at least two of the tracers in predetermined concentration ratios are used. Recovered fluid is analyzed for the presence of each of the tracers and the ratios of the tracers indicates breakthrough of each injected slug.

REFERENCES:
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patent: 3258072 (1966-06-01), Froning
patent: 3372746 (1968-03-01), Sanderson et al.
patent: 3508875 (1970-04-01), Sandford
patent: 3508876 (1970-04-01), Polly
patent: 3590923 (1971-07-01), Cooke
patent: 3811501 (1974-05-01), Burnett et al.
patent: 3851171 (1974-11-01), Saniford
patent: 3902362 (1975-09-01), Tomich et al.

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