Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination
Patent
1978-11-21
1980-12-16
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Borehole direction or inclination
33312, G01C 906, E21B 47022
Patent
active
042388899
ABSTRACT:
A device for continuously measuring the azimuth and slope of a drilling l includes a gyroscope and an accelerometer station disposed in a container suspended from a cable. The gyroscope and the accelerometer station are mounted on an inner frame pivotally mounted on an outer frame on an axis which is perpendicular both to the axis of rotation of the gyroscope and the axis of the drilling line. The outer frame is pivotally mounted in the container on the longitudinal axis of the container. An angular position detector measures the angular movements of the inner frame in relation to the outer frame. A first motor controlled by stabilization error information delivered by the gyroscope and corresponding to one axis of gyroscope sensitivity rotates the inner frame in relation to the outer frame, and a second motor controlled by stabilization error information delivered by the gyroscope and corresponding to a second axis of sensitivity rotates the outer frame in relation to the container. A precession circuit imposes on the gyroscope precession controlled proportionally to the slope of the axis of rotation of the gyroscope in relation to the horizontal plane so as to maintain the axis of rotation in a horizontal plane.
REFERENCES:
patent: 2635349 (1953-04-01), Green
patent: 3384750 (1968-05-01), Owen
patent: 3753296 (1973-08-01), Van Steenwyk
patent: 3896412 (1975-07-01), Rohr
patent: 3938256 (1976-02-01), Crocker, Jr.
patent: 4071959 (1978-02-01), Russell et al.
Martin, Jr. William D.
Societe d'Applications Generales d'Electricite et de Mecanique S
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