High speed well surveying

Details High speed well surveying High speed well surveying

G - Physics

01

B

33/164

G01B 3/26 (2006.01) E21B 47/022 (2006.01)

Patent

CA 1242876

HIGH SPEED WELL SURVEYING ABSTRACT OF THE DISCLOSURE A borehole survey apparatus including a) angular rate sensor means having a sensitive axis, b) tilt sensor means, c) a rotary drive operatively connected to said a) and b) sensor means to rotate same about an axis extending generally in the direction of the borehole, ' d) and circuitry operatively connected with said a) and b) sensor means to determine the azimuthal direction of tilt of the borehole at a first location therein, said a) sensor means also connected in feedback relation with the drive whereby the sensitive axis of the a) sensor means is maintained at a predetermined orientation relative to horizontal during travel of said apparatus in the borehole relative to said first location, and whereby changes in borehole alignment during said travel may be determined. -1-

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