Measuring and testing – Borehole or drilling – Downhole test
Patent
1997-10-29
1999-10-26
Chapman, John E.
Measuring and testing
Borehole or drilling
Downhole test
73382R, G01V 702
Patent
active
059707879
ABSTRACT:
A tool for conducting gravimetry survey downhole in an earth formation includes a pressure vessel which houses a gravity sensor that is supported by a gimbal. The gravity sensor is aligned with vertical before taking gravity measurements by a first stepper motor and a second stepper motor. The first stepper motor incrementally rotates the gimbal about the pivot axis of the gimbal while the second stepper motor incrementally rotates the gimbal about the longitudinal axis of the pressure vessel. The stepper motors are controlled by an electronic processor that responds to signals from an accelerometer assembly that measures the inclination of the pressure vessel with respect to vertical. An elevator mechanism translates the gravity sensor from one station to the next inside the pressure vessel to make gravity measurements and an optical encoder monitors the position of the gravity sensor inside the pressure vessel.
REFERENCES:
patent: 2570659 (1951-10-01), Fay
patent: 2618156 (1952-11-01), Boucher
patent: 2657581 (1953-11-01), Fay
patent: 2930138 (1960-03-01), La Coste
patent: 2953023 (1960-09-01), Goodell
patent: 3027767 (1962-04-01), Slack et al.
patent: 3264875 (1966-08-01), Goodell et al.
patent: 3472076 (1969-10-01), Howell et al.
patent: 3995479 (1976-12-01), Chapman, III
patent: 4040189 (1977-08-01), La Coste
patent: 4445371 (1984-05-01), Lautzenhiser
patent: 4475386 (1984-10-01), Fitch et al.
patent: 4596139 (1986-06-01), Gournay
patent: 4602508 (1986-07-01), Fitch et al.
patent: 4803479 (1989-02-01), Graebner et al.
patent: 4809545 (1989-03-01), Lyle
patent: 4935883 (1990-06-01), Hulsing, II
patent: 5448912 (1995-09-01), Black
J. L. Brady, D. S. Wolcott, & C. L. V. Aiken, "Gravity Methods: Useful Techniques for Reservoir Surveillance", SPE 26095, May 26-28, 1993 SPE Western Region Meeting, Anhorage, Alaska, pp. 645-658.
J. L. Brady, D. S. Wolcott, & C. L. V. Aiken, "Gravity Methods: Useful Techniques for Reservoir Surveillance", Jul.-Aug. 1996, The Log Analyst, pp. 45-56.
Chapman John E.
Jeffery Brigitte L.
Ryberg John J.
Schlumberger Technology Corporation
LandOfFree
Downhole gravity tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Downhole gravity tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Downhole gravity tool will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-751430