Borehole surveying

Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination

Reexamination Certificate

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Details

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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