Bore hole navigator

Details Bore hole navigator Bore hole navigator

1986-09-05

1987-09-29

Stearns, Richard R.

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

33312, G01C 1916, E21B 47022

Patent

active

046961127

ABSTRACT:
A bore hole navigator utilizing a two axis directional gyro on the inner frame of the navigator and a single axis accelerometer on the outer frame is disclosed. This allows the inner frame of the navigator and thus the entire navigator to be smaller in diameter, both because of the removal of the acceleration axis to the outer gimbal and because the electrolytic level sensor, if used, is much smaller than a single axis accelerometer. The overall smaller diameter is maintained by using a belted design wherein the gyro/electrolytic level sensor, the inner frame torquer/gear and the inner frame resolver are connected in series along the length of the navigator, with a high gear reduction ratio on the inner frame torquer providing a positive drive within a smaller diameter. This configuration, together with unique calculation algorithms allows smaller diameter and deeper holes to be surveyed.

REFERENCES:
patent: 4197654 (1980-04-01), Van Steenwyk et al.
patent: 4238889 (1980-12-01), Barriac
patent: 4244116 (1981-01-01), Barriac
patent: 4245498 (1981-01-01), Poquette, Jr.

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