Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination
Reexamination Certificate
2005-02-15
2005-02-15
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Indicator of direction of force traversing natural media
Borehole direction or inclination
Reexamination Certificate
active
06854192
ABSTRACT:
A borehole drilling and survey assembly includes a drill string of magnetic material, a non-magnetic drill collar, and a non-magnetic rotary drilling system including a drill bit. A near-bit survey instrument is located in the rotary drilling system at a fixed distance from the junction of the drill string and the drill collar. A second survey instrument is located in the drill collar at a fixed distance from said junction. The survey instruments measure the local values of the component of the earth's magnetic along the borehole axis, and these values are processed to remove the magnetic effects of the drillstring. The survey instruments optionally also measure gravity vector components to enable borehole heading to be derived.
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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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