Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination
Patent
1994-01-12
1995-07-25
Cuchlinski, Jr., William A.
Geometrical instruments
Indicator of direction of force traversing natural media
Borehole direction or inclination
33313, 364422, E21B 47022
Patent
active
054350697
ABSTRACT:
A method for determining the direction of a borehole during drilling comprises determination of inclination angle .theta. and highside angle .phi. from gravity acceleration (g) measurements and determination of azimuth angle .psi. from magnetic field (B) measurements along with the calculated inclination angle .theta. and highside angle .phi., the determinations being carried out in conventional XYZ-and-NEV coordinate systems coupled by Euler-angle coordinate transformations. In particular g and B are measured at least at two borehole depths such that .phi..sub.i does not equal .phi..sub.i+1, and .psi..sub.i and .psi..sub.i+1 are calculated from B.sub.i =[.phi..sub.i ].sup.T [.theta..sub.i ].sup.T {[.psi..sub.l ].sup.T B.sub.e }+B.sub.p with i as number of measurement, B.sub.e as local earth magnetic field, and B.sub.p as perturbating magnetic field. As a result perturbating magnetic fields, for example caused by hot spots or nearby magnetic steel components in the drilling or logging string nearby the B-measuring device, are determined accurately.
REFERENCES:
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patent: 4682421 (1987-07-01), van Dongen et al.
patent: 4709782 (1987-12-01), Walters
patent: 4812977 (1989-03-01), Hulsing, II
patent: 5012412 (1991-04-01), Helm
patent: 5128867 (1992-07-01), Helm
Foreign search report dated 17 Mar. 1994.
Bennett G. Bradley
Cuchlinski Jr. William A.
Shell Oil Company
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