Borehole surveying

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 47/12 (2006.01) E21B 47/00 (2006.01) E21B 47/024 (2006.01)

Patent

CA 2440907

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 senior the azimuth angle of the drillstring at the instrument package.

Méthode et appareil pour la diagraphie de puits. La méthode comprend les étapes suivantes : l'installation d'un ensemble d'instruments à l'extrémité avant d'un train de tiges de forage, l'ensemble d'instruments comprenant deux capteurs à axe unique montés pour tourner avec le train de tiges de forage autour de l'axe de rotation du train de tiges de forage, le premier capteur étant un accéléromètre et le second capteur étant une sonde magnétométrique ou un gyromètre; la rotation du train de tiges de forage; le calcul, à partir du premier capteur, de l'angle d'inclinaison du train de tiges de forage à l'endroit où se trouve l'ensemble d'instruments; le calcul, à partir du second capteur, de l'angle d'azimut du train de tiges de forage à l'endroit où se trouve l'ensemble d'instruments.

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