Jimmy Dale Wirtz

44571682, Jul 3, 1984

Mar 10, 1983

6/474064

Theodore V. Lautzenhiser - Tulsa OK
Jimmy D. Wirtz - Tulsa OK

Standard Oil Company - Chicago IL

G01V 704
G01N 2904

73151

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.