E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
358/3
E21B 43/26 (2006.01) E21B 47/10 (2006.01) G01V 5/08 (2006.01)
Patent
CA 1294067
ABSTRACT OF THE INVENTION A method for determining the mean depth of penetration of one or more radioactive tracers injected by a hydraulic fracturing process into a fractured formation disposed about a well bore as an indication of the extent of radial frac- tures including the steps of measuring with a radioactivity detector in the well bore at the depth of the formation frac- ture, the degradation of the gamma ray energy spectra of the radioactive tracer in the fractured formations resulting from the traverse of radiation through the formations and borehole to the detector; obtaining a ratio Image the count rates CA and CB in two energy ranges where the range for obtaining CA is sensitive to primary radiation reaching the detector without Compton scattering and the other region for obtaining CB detects radiation degraded through Compton scattering collisions. The ratio Image is a tracer penetration index (TPI) corresponding to the mean radial distance R between tracer and detector and the extent of radial fracture. For removing potential interference in the determination of R due to the presence of the tracer in the borehole, the method also pro- vides for obtaining a ratio of count rates M/P in two low energy regions of the tracer spectrum - one region "M" sen- sitive only to Compton scattered radiation and a region "P" sensitive to photoelectric absorption in iron. The ratio M/P is a tracer borehole index (TBI) which indicates the relative presence of tracer in the formation compared to the borehole, and whether the borehole count rate obtained from a selected interval of well bore containing only borehole tracer needs to be removed from the total spectra observed in an interval of interest to obtain a borehole insensitive calculation of tracer penetration index.
585885
Gadeken Larry L.
Smith Harry D. Jr.
Company Halliburton
Gadeken Larry L.
Haliburton Company
Smith Harry D. Jr.
Swabey Ogilvy Renault
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