Measuring and testing – Borehole or drilling – Downhole test
Patent
1983-03-10
1984-07-03
Woodiel, Donald O.
Measuring and testing
Borehole or drilling
Downhole test
G01V 704, G01N 2904
Patent
active
044571682
ABSTRACT:
An automated borehole gravity meter system for measuring gravity within a wellbore. The gravity meter includes leveling devices for leveling the borehole gravity meter, displacement devices for applying forces to a gravity sensing device within the gravity meter to bring the gravity sensing device to a predetermined or null position. Electronic sensing and control devices are provided for (i) activating the displacement devices, (ii) sensing the forces applied to the gravity sensing device, (iii) electronically converting the values of the forces into a representation of the gravity at the location in the wellbore, and (iv) outputting such representation. The system further includes electronic control devices with the capability of correcting the representation of gravity for tidal effects, as well as, calculating and outputting the formation bulk density and/or porosity.
REFERENCES:
patent: 3798966 (1974-03-01), Planche
patent: 4399693 (1983-08-01), Gournay
Block and Moore, "Measurements in the Earth Mode Frequency Range by an Electrostatic Sensing and Feedback Gravimeter" Journal of Geophysical Research, vol. 71, No. 18, 9/15/66, pp. 4361-4375.
Moore and Farrell, "Linerazation and Calibration of Electrostatically Feedback Gavity Meters", Journal of Geophysical Research, vol. 75, No. 5, 2/10/79, pp. 928-932.
Lautzenhiser Theodore V.
Wirtz Jimmy D.
Brown Scott H.
Harding, Jr. Ellwood G.
Standard Oil Company
Stanley Timothy D.
Woodiel Donald O.
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