Boots – shoes – and leggings
Patent
1984-09-07
1988-04-05
Smith, Jerry
Boots, shoes, and leggings
324366, 367 65, G01V 328
Patent
active
047363002
ABSTRACT:
In apparatus for investigating earth formations traversed by a borehole, improved methods and apparatus are provided for performing inductive type formation measurements. A transmitter coil of a well logging tool moving through a borehole emits an alternating field into the adjacent earth formation thus inducing eddy currents therein. A voltage in a receiver coil in the tool is sampled at discrete elevations as the tool traverses the borehole and amplified. This voltage is phase detected with respect to the transmitter coil voltage to insure that the measured receiver voltage corresponds to the currents induced in the formation. An average of these voltage measurements is formed. Variations in the magnitude of the average phase-detected voltage are used to discretely control the amplitude of the alternating current induced into the formation.
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Jablon Clark A.
McCollum Patrick H.
Smith Jerry
Western Atlas International Inc.
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