Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1986-12-19
1988-05-10
Fields, Carolyn E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250256, G01V 902
Patent
active
047437618
ABSTRACT:
All natural water sources are "labeled" by a unique ratio of strontium isotopes (.sup.87 Sr/.sup.86 Sr). In accordance with the invention, the strontium isotope ratio for oil bearing formation water and for seawater which is to be injected into the formation is determined. The strontium isotope ratio of the produced water is then monitored at regular intervals and, when the strontium isotope ratio changes to that of the injected water, water injection breakthrough is delimited. The strontium isotope ratio thus serves as a natural tracer for seawater injection.
REFERENCES:
patent: 3851171 (1974-11-01), Saniford et al.
patent: 4178506 (1979-12-01), Fertl
patent: 4482806 (1984-11-01), Wagner, Jr. et al.
Chemical Abstracts, vol. 51, No. 11203, "Isotopic Composition of Strontium from Seal Water & from Rubidium Pool Rock."
Chemical Abstracts, vol. 86, 1977, "Strontium Isotopes in Selected Streams within the Susquehanna River Basin."
Chemical Abstracts, vol. 102, 1985, "Means for Monitoring the Results of Sampling Oil and Gas Wells Based on an Analysis of Liquid Samples by Nuclear-Physics Methods."
Raheim Arne
Smalley Philip C.
Conoco Inc.
Fields Carolyn E.
Miller John A.
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