E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
354/25
E21B 47/00 (2006.01) E21B 47/022 (2006.01) E21B 47/04 (2006.01)
Patent
CA 1287169
APPARATUS AND METHOD FOR DETERMINING THE POSITION OF A TOOL IN A BOREHOLE Abstract of the Disclosure A system and method for precisely and continuously estimating the path length between the entrance of a borehole and a probe (10) which is supported by an elastic cable (14) and carries a gyrocluster (42) and accelero- meter cluster (40). The precise estimate of borehole path length is used to aid the inerital navigation performed within the survey system and Is selectively determined by integration of either the rate at which the probe (10) moves alongthe borehole or a compensated cable feed rate that is based on the rate at whichthe cable (14) passes Into or out of the borehole with correction being made forchanges in temperature and gravity induced cable stretch. Selection of the rate to be integrated at any given time being determined by whether the rate at which probe (10) moves along the borehole exceeds the compensated cable feed rate by a predetermined amount.
555626
Peters Rex B.
Peters Rex B.
Riches Mckenzie & Herbert Llp
Sundstrand Corporation
Sunstrand Data Control Inc.
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