Wells – Brushing – scraping – cutting or punching-type cleaners – On tubing or casing
Patent
1993-06-29
1994-08-09
Bui, Thuy M.
Wells
Brushing, scraping, cutting or punching-type cleaners
On tubing or casing
E21B 3702
Patent
active
053357230
ABSTRACT:
A combination scratcher-centralizer for use in installing casing in wellbores comprising a single piece of coiled wire or rod having a first hub part for tightly engaging the casing, a radially expanded centralizer and scratcher portion forming a helical wrap of said wire and a second hub part slidable on the casing and formed by a helical wrap of said wire. The first hub part includes serrations and/or a plurality of retaining screws provided so that the first hub part may be secured to the casing in a predetermined position to allow the expanded centralizer coil or wrap portion to undergo some elastic axial excursion during its scratching and scraping operation upon installation in a wellbore. The constricted hub part may be held in a radially expanded position during installation by a retainer engageable with spaced apart portions of the wraps of the hub part.
REFERENCES:
patent: 3176771 (1965-04-01), Claiborne et al.
patent: 3351136 (1967-11-01), Nelson
patent: 3842906 (1974-10-01), Paramore et al.
Atlantic Richfield Company
Bui Thuy M.
Martin Michael E.
LandOfFree
Combination scratcher-centralizer for wellbore casings does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combination scratcher-centralizer for wellbore casings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combination scratcher-centralizer for wellbore casings will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-210231