A process utilizing natural carbon-13 isotope for...

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G01N 33/18 (2006.01) E21B 49/08 (2006.01) G01N 31/02 (2006.01) C09K 8/58 (2006.01) G01N 33/24 (2006.01) G01N 33/28 (2006.01) E21B 47/10 (2006.01)

Patent

CA 2674127

This invention relates to a process utilizing natural carbon-13 isotope for identification of early breakthrough of injection water in oil wells. All natural water sources are labeled by unique ratios of carbon isotopes (13C/12C). Following the requirements of the invention, the carbon isotope ratio for oil bearing formation water and for local aquifer water which is to be injected in to the oil reservoir rock is determined. The carbon isotope ratio of the produced water from the selected oil wells is then monitored periodically. When the carbon isotope ratio of the produced (oil well) water shows deviation from the formation water value and tends towards injection water value, then the early breakthrough phenomenon of injection water is identified. Thus the contrast in natural carbon isotope ratios of injection water, formation water and produced water from selected oil wells serve as tracer in the identification of "Early Breakthrough" phenomenon of injection water and its movement.

L'invention porte sur un procédé utilisant l'isotope naturel 13 du carbone pour l'identification de la première percée de l'eau d'injection dans des puits de pétrole. Toutes les sources naturelles d'eau sont marquées par des proportions uniques d'isotopes (13C/12C) du carbone. Selon l'invention, la proportion d'isotopes du carbone dans les eaux de formation pétrolifères et dans les eaux aquifères locales devant être injectée dans la roche réservoir pétrolifère est déterminée, et on suit périodiquement la proportion d'isotopes du carbone des eaux de production dans des puits de pétrole sélectionnés. Quand la proportion d'isotope de carbone de l'eau d'un puits de pétrole dévie de la valeur de l'eau de formation et tend vers la valeur de l'eau d'injection, on peut alors identifier le premier phénomène de percée de l'eau d'injection. Ainsi le contraste entre les proportions d'isotope naturels du carbone dans l'eau d'injection, l'eau de formation, et l'eau produite dans des puits de pétrole sélectionnés, sert de traceur pour l'identification du phénomène de " Première Percée" de l'eau d'injection, et de son déplacement.

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