Borehole gradiometer

Details Borehole gradiometer Borehole gradiometer

G - Physics

01

V

73/44

G01V 7/00 (2006.01) E21B 47/022 (2006.01) G01V 7/08 (2006.01)

Patent

CA 1215246

ABSTRACT OF THE INVENTION An apparatus and its use for measuring the dif- ferences 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 elec- trical control current. The second electrical control current is indicative of differences in gravity forces detected by the first and second gravity measuring dev- ices, thereby providing a gravitational gradient reading.

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