Method of determining the orientation of a surveying instrument

Details Method of determining the orientation of a surveying instrument Method of determining the orientation of a surveying instrument

1986-05-06

1987-12-01

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

33312, 33316, F21B 4722

Patent

active

047094869

ABSTRACT:
A method of determining the orientation of a surveying instrument in a borehole from measurements of the earth's gravitational and magnetic fields wherein the azimuth angle is calculated directly without correcting an apparent azimuth. Those measurements are used to calculate the borehole axial magnetic component at each orientation of the surveying instrument in the borehole, and the borehole axial magnetic component is used, along with those measurements, to directly calculate the proper azimuth angle. In a preferred embodiment, measurements are taken at a plurality of orientations in the borehole and the borehole axial magnetic component is calculated in simultaneous equations and then compared to insure the accuracy of the azimuth computation at each orientation. The orientations are preferably non-colinear.

REFERENCES:
patent: 3791043 (1974-02-01), Russell
patent: 3862499 (1975-01-01), Isham et al.
patent: 4468863 (1984-09-01), Van Steenwyk
patent: 4472884 (1984-09-01), Engebretson
patent: 4507958 (1985-04-01), Russell et al.
patent: 4510696 (1985-04-01), Roesler
Chadderdon, J. and W. T. Kittinger, "How to Get the Most from Non-Magnetic Colors for Directional Drilling", Oil & Gas Journal, Apr. 16, 1962, pp. 104-109.

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