Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-04-10
1977-04-19
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01V 308, G01V 318
Patent
active
040191265
ABSTRACT:
A dipmeter in a well logging tool includes conventional type circuitry which senses the angle of inclination of the logging tool and an azimuth angle. The dipmeter also includes a non-conventional type bed detection sub-system. The bed detection sub-system includes at least three radio frequency oscillators having their coils mounted on pads of the logging tool. As the logging tool moves through the borehole, the electrical current passing through the coils on the pads causes lines of flux to circulate through the earth formation. Eddy currents are developed for each group of fluxlines created by a coil. As the earth formation changes, the eddy current changes accordingly causing a grid current in the oscillator to change. Portion of the grid currents are transmitted uphole and are recorded so that the interface between the types of earth's formation may be recorded with its relationship to the particular borehole and thus used to determine the dip of different earth formation beds.
REFERENCES:
patent: 2167630 (1939-08-01), Bazzoni et al.
patent: 3068400 (1962-12-01), Castel et al.
patent: 3187252 (1965-06-01), Hungerford
patent: 3388323 (1968-06-01), Stripling
patent: 3510757 (1970-05-01), Huston
patent: 3609521 (1971-09-01), Desbrandes
Gillespie Ronald G.
Ries Carl G.
Strecker Gerard R.
Texaco Inc.
Whaley Thomas H.
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