Wells – Processes – With indicating – testing – measuring or locating
Patent
1989-08-09
1990-10-23
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
166 66, 166 665, E21B 4709, G01B 700, G01V 326
Patent
active
049644629
ABSTRACT:
A snubbing unit, used to raise or lower a collar-connected series of tubing joints through a riser spool communicating 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 between the upper and lower blowout preventers of each tubing collar. The sensing system includes upper and lower electromagnetic 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.
REFERENCES:
patent: 3106960 (1963-10-01), Doak
patent: 3410355 (1968-11-01), Garrett
patent: 3488578 (1970-01-01), Stigmark
patent: 3843923 (1974-10-01), deVries et al.
patent: 3857089 (1974-12-01), Adler et al.
patent: 3890607 (1975-06-01), Pelenc et al.
patent: 4110688 (1978-08-01), Bailey
patent: 4121657 (1978-10-01), McClure
patent: 4206810 (1980-06-01), Blackman
patent: 4244424 (1981-01-01), Talbot
patent: 4291761 (1981-09-01), Watson
patent: 4629983 (1986-12-01), Boomgaard et al.
patent: 4634126 (1987-01-01), Kimura
patent: 4668465 (1987-05-01), Boomgaard et al.
patent: 4694902 (1987-09-01), Hormansdorfer
patent: 4708204 (1987-11-01), Stroud
LandOfFree
Tubing collar position sensing apparatus, and associated methods does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tubing collar position sensing apparatus, and associated methods, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tubing collar position sensing apparatus, and associated methods will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-760342