Water injection profiling

Details Water injection profiling Water injection profiling

G - Physics

01

V

358/4

G01V 5/10 (2006.01)

Patent

CA 1138574

WATER INJECTION PROFILING (D#76,535-F) ABSTRACT OF THE DISCLOSURE Water injection profiling of a well by nuclear log- ging is disclosed. A dual detector sonde with a high energy neutron source and a spinner flowmeter is oriented and positioned above and below perforations in the casing of an injection well to monitor upward and downward flow, respectively, of injection water. The water is irradiated by the neutron source and resulting gamma ray production is sensed as the activated water flows by the spaced detectors. Count rate data is reduced and analyzed in terms of two energy windows to obtain linear flow velocities for water flow behind the casing. Fluid flow within the casing is measured by means of the spinner flowmeter. Volume flow rates are determined for upward and downward flow, and horizontal volume flow into the surrounding formations is calculated.

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