Continuous measurement-while-drilling surveying

Details Continuous measurement-while-drilling surveying Continuous measurement-while-drilling surveying

E - Fixed Constructions

21

B

E21B 47/024 (2006.01) E21B 44/00 (2006.01) E21B 47/12 (2012.01) G01C 19/02 (2006.01)

Patent

CA 2338075

A continuous measurement-while-drilling surveying apparatus includes a fiber optic gyroscope sensitive to rotation about the tool spin axis of the bottom hole assembly and a second fiber optic gyroscope sensitive to rotation of the bottom hole assembly about an axis normal to the tool spin axis. The first gyroscope may be shaped as a torus to accommodate flow of drilling mud through the bottom hole assembly. The outputs of the first and second gyroscopes are processed together with acceleration signals from three accelerometers in a microprocessor which determines the orientation, velocity and position of the bottom hole assembly on a continuous basis.

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