Natural tracer for secondary recovery water injection process

Details Natural tracer for secondary recovery water injection process Natural tracer for secondary recovery water injection process

E - Fixed Constructions

21

B

358/5.04

E21B 47/10 (2006.01) E21B 43/20 (2006.01)

Patent

CA 1281438

Abstract of the Disclosure All natural water sources are "labeled" by a unique ratio of strontium isotopes (87Sr/86Sr). In accor- dance 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.

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