G - Physics – 01 – V
Patent
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G01V 5/00 (2006.01) E21B 43/119 (2006.01) E21B 47/00 (2006.01) G01V 5/06 (2006.01)
Patent
CA 1118911
METHOD FOR ASCERTAINING OPTIMUM LOCATION FOR WELL STIMULATION AND/OR PERFORATION Abstract of the Disclosure A method is disclosed for the in situ examination of earth formations penetrated by a borehole to ascertain the optimum location along the length thereof for instituting well stimulation operations or, where the well is cased, the optimum location for perforating the casing. The method utilizes natural gamma ray logging to determine the optimum locations with the natural gamma ray radiation of the earth formation surrounding the borehole measured and the total measurement then separated into potassium-40, uranium, and thorium energy-band signals. A differential value is derived by subtracting the energy-band signal for either potassium or thorium from the energy-band signal for uranium, with the differential thereafter compared to a energy-level standard having a preselected magnitude. The optimum locations for perforating and/or instituting well stimulation operations will be those zones in which the differential exceeds the preselected energy level standard.
330952
Fertl Walter H.
Vaello Donald B.
Dresser Industries Inc.
Macrae & Co.
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