Surveying of boreholes

Details Surveying of boreholes Surveying of boreholes

1989-06-09

1991-03-19

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

33312, E21B 47022

Patent

active

049999206

ABSTRACT:
A method of deriving the true magnitude of the terrestial magnetic field in the direction of the longitudinal axis of a borehole at a region of the borehold occupied by an instrumentation package equipped with magnetic vector measuring means for measuring the lateral magnetic vectors Bx and By and further equipped with gravitational vector measuring means for measuring each of the three gravitational vectors Gx, Gy, and Gz.
The method comprises the steps of performing said measurements of the magnetic vectors and the gravitational vectors and from said vector measurements solving the equation:

REFERENCES:
patent: 3862499 (1975-01-01), Isham et al.
patent: 4510696 (1985-04-01), Roesler
patent: 4682421 (1987-07-01), Dongen et al.
patent: 4709486 (1987-12-01), Walters
patent: 4819336 (1989-04-01), Russell

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