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

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

2008-04-28

2010-06-08

Bomar, Shane (Department: 3676)

Wells

Processes

With indicating, testing, measuring or locating

C166S255200, C175S045000

Reexamination Certificate

active

07730943

ABSTRACT:
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.

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International Combined Search and Examination Report received in UK application No. GB0901735.1 dated Jun. 29, 2009.
Examination Report received in UK application GB0901735.1 dated Dec. 2, 2009.

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