Behind casing water volume flow rate measurement using...

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

G - Physics

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G01V 5/00 (2006.01) E21B 47/10 (2006.01) G01F 1/704 (2006.01) G01V 5/10 (2006.01) G01V 9/00 (2006.01)

Patent

CA 1059650

BEHIND CASING WATER VOLUME FLOW RATE MEASUREMENT USING CONCENTRIC GAMMA RAY DETECTORS (D#74,517-1-F) ABSTRACT OF THE DISCLOSURE Measurement of the distance from a gamma ray detector to a gamma ray source for location of a channel of undeisred behind casing water flow in a producing well is provided. Coaxially aligned dual cylindrical gamma ray detector crystals are used at one or more longitudinally spaced locations in the borehole to detect the characteristic gamma rays from the decay of radioactive nitrogen 16 pro- duced by the activation of elemental oxygen nuclei comprising the molecular structure of undesired water flow. The ratio of counts at the outer coaxial detector to those at the inner coaxial detector is then interpreted in terms of R, the dis- tance from the detector to the water flow channel. This dis- tance information may then be combined with the linear flow velocity of such undesired water flow to derive an indication of the volume flow rate V of such flow. I

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