Surveying of boreholes

Details Surveying of boreholes Surveying of boreholes

1978-02-23

1979-08-07

Stephan, Steven L.

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

E21B 47022

Patent

active

041633245

ABSTRACT:
When surveying a borehole using an instrument responsive to the earth's magnetic field, the assumption is made that the error vector which comprises the difference between the true earth's magnetic field and the measured magnetic field in the borehole is in the direction of the borehole axis. The magnitude of this error vector is determined and used to correct the magnetically measured azimuth.

REFERENCES:
patent: 3791043 (1974-02-01), Russell
patent: 3862499 (1975-01-01), Isham et al.
patent: 3935642 (1976-02-01), Russell

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