Method for ascertaining optimum location for well stimulation an

Details Method for ascertaining optimum location for well stimulation an Method for ascertaining optimum location for well stimulation an

1978-09-29

1980-02-12

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

73152, 250256, E21B 4700, E21B 4705, G01V 500

Patent

active

041879082

ABSTRACT:
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.

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patent: 3976878 (1976-08-01), Chevalier et al.
patent: 4071755 (1978-01-01), Supernaw et al.

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