Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination
Reexamination Certificate
2006-04-18
2006-04-18
Barlow, John (Department: 2863)
Geometrical instruments
Indicator of direction of force traversing natural media
Borehole direction or inclination
C702S006000
Reexamination Certificate
active
07028409
ABSTRACT:
A method is provided for computing the differential azimuth between two sets of spaced-apart gravity component measurement devices in a borehole, employing multiple rotation angles. The method includes modeling relationships of axes as defined; forming equations relating rotation angles to outputs of gravity measuring devices; solving such equations to derive the values representative of all of the rotation angles, using measured values of the outputs from the first and second sets of gravity component measuring devices, and computing from the values of the rotation angles the differential azimuth angle between the first set and the second set of gravity measuring devices.
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Engebretson Harold J.
Van Steenwyk Brett H.
Barlow John
Haefliger William W.
Scientific Drilling International
Taylor Victor J.
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