Wells – Brushing – scraping – cutting or punching-type cleaners – On tubing or casing
Patent
1984-04-02
1985-12-17
Novosad, Stephen J.
Wells
Brushing, scraping, cutting or punching-type cleaners
On tubing or casing
E21B 3702
Patent
active
045587388
ABSTRACT:
A well casing scraper includes a mandrel having two sets of blade mounting structures, each having a cam surface sloping axially upward and radially outward. A vertical, dovetail shaped tongue on the cam surface interlocks with a dovetail shaped slot in the back of the blade piece to permit the blade piece to slide vertically, but prevent circumferential and direct radial movement of the blade piece relative the mandrel. The back of the blade piece also includes a cam surface to slide on the mandrel cam surface so the blade piece moves radially outward as it moves axially upward, and moves radially inward as it moves axially downward. An adjustable upper sleeve for each set of blades prevents upward and outward movement. An adjustable lower sleeve and resilient sleeve permits controlled downward and radially inward movement of the blades.
The cam surfaces and upper collar ensure a constant blade diameter is maintained during the scraping operation. The lower sleeve and resilient collar permit limited retraction of the blades when the scraper is withdrawn from the casing.
REFERENCES:
patent: 2184393 (1939-12-01), Luccous
patent: 2203966 (1940-06-01), Otis
patent: 2464390 (1949-03-01), Hammer
patent: 2693239 (1954-11-01), Emanuel
patent: 3032114 (1962-05-01), Best
patent: 3105555 (1963-10-01), Villalon, Jr.
patent: 3251418 (1964-04-01), Condra
patent: 3289766 (1966-12-01), Bigelow
patent: 3326294 (1967-06-01), Neilson
patent: 3757859 (1973-09-01), Hammon
patent: 4291764 (1981-09-01), Pampell
Neuder William P.
Novosad Stephen J.
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