Borehole initial alignment and change determination

Details Borehole initial alignment and change determination Borehole initial alignment and change determination

1985-08-23

1987-11-17

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

33324, G01C 1938

Patent

active

047063882

ABSTRACT:
A borehole survey apparatus includes an angular rate sensor, a tilt sensor, a rotary drive to rotate the sensors about an axis extending in the direction of the borehole, circuitry connected with said sensors to determine the azimuthal direction of tilt of the borehole at a first location therein, drive control circuitry and a switch operatively connected with the sensors whereby they may be connected in feedback relation with the rotary drive so that an axis defined by a support for the rate sensor is maintained at predetermined orientation relative to horizontal during travel of the apparatus in a borehole relative to the first location, and integration circuitry connected with the rate sensor whereby changes in borehole alignment during travel may be determined.

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