Patent ID: 9273547
Filing Date: 2016-03-01
CPC Classification: E21B

Claim Text:
1. A method for making a dynamic borehole azimuth measurement while rotating a downhole measurement tool in a borehole, the method comprising: (a) rotating a downhole tool in the borehole, the downhole tool including a cross-axial magnetic field sensor and an axial accelerometer; (b) obtaining a set of cross-axial magnetic field measurements and a set of axial accelerometer measurements while the downhole tool is rotating in (a); (c) processing the set of cross-axial magnetic field measurements obtained in(b) to compute a magnitude of a cross-axial magnetic field component; and (d) processing the magnitude of the cross axial magnetic field component computed in (c) and the set of axial accelerometer measurements obtained in (b) to compute the dynamic borehole azimuth, wherein the dynamic borehole azimuth is computed in (d) according to the following equation: wherein Azi represents the dynamic borehole azimuth, B