G - Physics – 01 – N
Patent
G - Physics
01
N
340/124.3
G01N 27/72 (2006.01) E21B 19/00 (2006.01) E21B 19/20 (2006.01) E21B 33/06 (2006.01) E21B 47/09 (2006.01) G01B 7/12 (2006.01)
Patent
CA 2022770
SMIM B7528 ABSTRACT A snubbing unit, used to raise or lower a collar- connected series of tubing joints through a riser spool com- municating with a well bore, is provided with an electromagnetic sensing system operative to detect and indicate the entry into, position within and travel direction within a sensing spool bet- ween the upper and lower blowout preventers of each tubing collar. The sensing system includes upper and lower electro- magnetic coils coaxially circumscribing the sensing spool, and a frequency generator for energizing the coils. First and second phase comparators are used to detect current phase alterations in the coils, caused by variations in the vertical proximity between each collar and the coils, and responsively transmit output signals indicative of such phase alterations. The output signals are sent to a position sensing circuit which utilizes them to illuminate collar position and travel direction lights on an operator control panel. -27-
Kirby Eades Gale Baker
Smith Michael L.
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