Behind casing water volume flow rate measurement using gamma...

Details Behind casing water volume flow rate measurement using gamma... Behind casing water volume flow rate measurement using gamma...

G - Physics

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G01V 5/00 (2006.01) E21B 47/10 (2006.01) G01F 1/64 (2006.01) G01F 1/704 (2006.01) G01V 5/10 (2006.01)

Patent

CA 1052478

BEHIND CASING WATER VOLUME FLOW RATE MEASUREMENT USING GAMMA RAY SPECTRAL DEGRADATION (D#74l5l7-F) ABSTRACT OF THE DISCLOSURE Measurement of the distance from a gamma ray detector to a gamma ray source for locating of a channel of undesired behind casing water flow in a producing well is provided. A relationship is given for the count rate ratio at a detector in two distinct energy regions of the gamma ray spectrum as a function of the distance from the gamma ray source. When counts of charac- teristic gamma rays due to the decay of radioactive nitrogen 16 produced by the activation of elemental oxygen nuclei comprising the molecular structure of undesired water flow are made then the distance R to such flow may be determined by means of the above relationship. This may then be inter- preted in terms of the volume flow rate V of the undesired water flow.

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