Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination
Reexamination Certificate
2005-04-26
2005-04-26
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Indicator of direction of force traversing natural media
Borehole direction or inclination
C175S045000
Reexamination Certificate
active
06883240
ABSTRACT:
The invention relates to a method and an apparatus for use in surveying boreholes. The method of the invention comprises the following steps: providing an instrument package in a leading end of a drillstring, the instrument package comprising first and second single-axis sensors mounted for rotation with the drillstring about the rotational axis of the drillstring, the first sensor being an accelerometer and the second sensor being a magnetic fluxgate or a rate gyro; rotating the drillstring; deriving from the first sensor the inclination angle of the drillstring at the instrument package; and deriving from the second sensor the azimuth angle of the drillstring at the instrument package.
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Alison Bourne, The UK Patent Office, Patents Act 1977 Search Report under Section 17, Aug. 23, 2002, UK (one page).
Russell Anthony W.
Russell Michael K.
Bennett G. Bradley
Oathout Mark A.
Smart Stabilizer Systems Limited
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