Determination of azimuthal offset and radius of curvature in...

E - Fixed Constructions – 21 – B

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E21B 47/02 (2006.01) E21B 7/04 (2006.01) E21B 44/00 (2006.01) E21B 47/022 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2652477

Methods and apparatus for determining the direction of borehole azimuthal offset and the borehole radius of curvature. Rotation rate of a borehole assembly is measured and mathematically converted into azimuthal torque imparted to the borehole assembly. Relative azimuthal offset is determined from variations in azimuthal torque over a rotation cycle of the borehole assembly. Relative radius of curvature is obtained from the magnitude of azimuthal torque over a rotation cycle. Relative azimuthal offset is converted to true azimuthal offset using an independent reference angle measurement. Relative borehole curvature is converted to true radius of curvature using a calibration constant determined in known borehole conditions.

Méthodes et appareil pour déterminer la déviation azimutale et la courbure du rayon d'un trou de forage. La vitesse de rotation d'un ensemble de trou de forage se mesure et est convertie mathématiquement en un couple azimutal conféré à l'ensemble de trou de forage. La déviation azimutale relative est déterminée en fonction des variations de couple azimutal pendant un cycle de rotation de l'ensemble de trou de forage. La courbure relative du rayon s'obtient à partir de la magnitude du couple azimutal pendant un cycle de rotation. La déviation azimutale relative est convertie en une déviation azimutale réelle à l'aide d'une mesure angulaire de référence indépendante. La courbure relative du trou de forage est convertie en une courbure de rayon réelle à l'aide d'une constante d'étalonnage déterminée dans des conditions connues de trou de forage.

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