Dynamic range control of electrode pad current in well logging t

Details Dynamic range control of electrode pad current in well logging t Dynamic range control of electrode pad current in well logging t

1982-04-30

1985-04-30

Smith, Jerry

Boots, shoes, and leggings

324366, 367 65, G01V 328

Patent

active

045148090

ABSTRACT:
In apparatus for investigating earth formations traversed by a borehole, improved methods and apparatus are provided for achieving dynamic range control of formation measurements. In one embodiment adapted to formation resistivity measurements, a well logging tool moving through a borehole emits a current into the adjacent earth formation, and a corresponding measurement voltage correlative to the resistivity is sampled at discrete elevations as the tool traverses the borehole. An average of these voltage measurements is formed. When the magnitude of this average exceeds or drops below a predetermined range, the magnitude of the survey voltage is decreased or increased respectively by a discrete amount.

REFERENCES:
patent: 2712627 (1955-07-01), Doll
patent: 3105190 (1963-09-01), Norris
patent: 3205433 (1965-09-01), Lamb
patent: 3790910 (1974-02-01), McCormack
patent: 3947756 (1976-03-01), Ryss
patent: 4399416 (1983-08-01), Gillespie
patent: 4439831 (1984-03-01), Sinclair

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