Wells – Brushing – scraping – cutting or punching-type cleaners – On tubing or casing
Patent
1990-01-08
1991-03-19
Dang, Hoang C.
Wells
Brushing, scraping, cutting or punching-type cleaners
On tubing or casing
1510416, 1510417, 166174, 166175, E21B 3702
Patent
active
050002600
ABSTRACT:
A casing scraper is provided for scraping foreign materials from the inside of pipe casing and other tubular members. The casing scraper is comprised of a central mandrel supporting a plurality of longitudinally and circumferentially extending scraper blades, the collective configuration of the scraper blades comprising a tube structure with the mandrel located at the longitudinal axis of the tube structure. Connecting links attach the mandrel to the plurality of scraper blades. Said connecting links are each pivotally attached to the mandrel and to the scraper blades. An adjustable spring is provided at the base of the mandrel and biased against the underside of the connecting links normally biasing said connecting links at a right angle to the axis of the mandrel, thereby normally positioning the scraper blades at the maximum distance from the mandrel allowed by the length of the connecting links. Upon assertion on the scraper blades of upward pressure or upon assertion on the scraper blades of downward pressure exceeding the spring force, the connecting links may extend at an angle other than ninety degrees from the mandrel, thereby allowing the scraper blades to retract inwardly toward the mandrel. The inward movement of the casing scraper blades is limited by the abutment of the longitudinal edges of the scraper blades. Interlocking extending sections and recesses are provided along the longitudinal edges of the scraper blades to provide continuity of the cutting surface.
REFERENCES:
patent: 560830 (1896-05-01), Balz
patent: 784359 (1905-03-01), Stephenson
patent: 1165441 (1915-12-01), Packingham
patent: 1666000 (1928-04-01), Campbell
patent: 2141508 (1938-12-01), Buckley et al.
patent: 2221137 (1940-11-01), Hector
patent: 2464390 (1949-03-01), Hammer
patent: 4189000 (1980-02-01), Best
patent: 4706748 (1987-11-01), Harris
Dang Hoang C.
New World Down Hole Tools, Incorporated
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