Borehole survey method and apparatus for drilling substantially

Details Borehole survey method and apparatus for drilling substantially Borehole survey method and apparatus for drilling substantially

1980-02-08

1982-11-30

Martin, Jr., William D.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

33302, 33312, 33313, E21B 700

Patent

active

043611923

ABSTRACT:
A borehole survey method and apparatus for use in drilling substantially horizontal boreholes through a mineral deposit wherein a dip accelerometer, a roll accelerometer assembly and a fluxgate are disposed near the drill bit, which is mounted on a bent sub, and connected to a surface computation and display unit by a cable which extends through the drill string. The dip angle of the borehole near the drill bit, the azimuth of the borehole near the drill bit and the roll angle or orientation of the bent sub are measured and selectively displayed at the surface while the drill string is in the borehole for utilization in guiding the drill bit through the mineral deposit along a predetermined path.

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Report to the Department of Interior, Bureau of Mines "Advanced Techniques for Drilling . . ." vols. 1 and 2, Mar. 1973.

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