A method and system for reducing error contributions to gyroscopic measurements is provided. The method includes receiving a plurality of signals indicative of at least one component of the Earth's rotation substantially perpendicular to a portion of a wel...

An orientation sensing apparatus includes a rotatable first member defining an x-y plane perpendicular to an axis of rotation and a z-axis coincident with the axis of rotation, an orientation sensor device for generating orientation data, and a rotation se...

A method and apparatus for a rugged three-axis inclinometer 100 for determining an object's orientation with respect to a gravitational field. Components of the apparatus include but not limited to a magnet 110, a non-magnetic casing 102, 104, a ferrofluid...

This invention provides a measurement-while-drilling (MWD) downhole assembly for use in drilling boreholes which utilizes gyroscopes, magnetometers and accelerometers for determining the borehole inclination and azimuth during the drilling of the borehole....

This invention provides a measurement-while-drilling (MWD) downhole assembly for use in drilling boreholes which utilizes gyroscopes, magnetometers and accelerometers for determining the borehole inclination and azimuth during the drilling of the borehole....

This invention provides a measurement-while-drilling (MWD) downhole assembly for use in drilling boreholes which utilizes gyroscopes, magnetometers and accelerometers for determining the borehole inclination and azimuth during the drilling of the borehole....