Surveying of boreholes using shortened non-magnetic collars

Details Surveying of boreholes using shortened non-magnetic collars Surveying of boreholes using shortened non-magnetic collars

1983-07-20

1985-04-16

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

33313, E21B 47022

Patent

active

045106967

ABSTRACT:
When surveying a borehole using an instrument responsive to the earth's magnetic field, a length of non-magnetic drill collar is necessary to house means for measuring the magnetic field in the borehole perpendicular to the direction of the borehole axis. The instrument determines the inclination angle and the highside angle from the gravitation measurements, with these measurements and the magnetic measurements, the azimuth angle is determined. Using the method of this invention a minimum length of non-magnetic material necessary for an accurate measurement may be calculated and used.

REFERENCES:
patent: 3862499 (1975-01-01), Isham et al.
patent: 3935642 (1976-02-01), Russell
patent: 4021774 (1977-05-01), Asmundsson et al.
patent: 4071959 (1978-02-01), Russell et al.
patent: 4083117 (1978-04-01), Russell et al.
patent: 4163324 (1979-08-01), Russell et al.
patent: 4199869 (1980-04-01), Van Steenwyk

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