Borehole gradiometer

Details Borehole gradiometer Borehole gradiometer

1983-07-05

1984-07-03

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

33308, 33312, E21B 47022

Patent

active

044570775

ABSTRACT:
An apparatus and its use for measuring the differences in gravity at spaced locations in a wellbore. The apparatus includes first and second gravity measuring devices mounted at spaced vertical positions from each other and encapsulated for movement through a wellbore. A first electrical control current, proportional to the force of gravity acting upon the first gravity measuring device, is provided as a bias current to a second electrical control current. The second electrical control current is indicative of differences in gravity forces detected by the first and second gravity measuring devices, thereby providing a gravitational gradient reading.

REFERENCES:
patent: 3587176 (1971-06-01), Schnerb
patent: 3693142 (1972-09-01), Jones
patent: 3862499 (1975-01-01), Isham et al.
patent: 4199869 (1980-04-01), Van Steenwyk
patent: 4244116 (1981-01-01), Barriac
"Linearization & Calibration of Electrostatically Fedback Gravity Meters"; Journal of Geophysical Research; p. 928; vol. 75, No. 5, Feb. 10, 1979.
"Measurements in the Earth Mode Frequency Range . . . "; Journal of Geophysical Research; vol. 71, No. 18, p. 4361, Sep. 15, 1966.

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