Wells – Brushing – scraping – cutting or punching-type cleaners – On tubing or casing
Patent
1980-01-07
1981-09-29
Leppink, James A.
Wells
Brushing, scraping, cutting or punching-type cleaners
On tubing or casing
E21B 3702
Patent
active
042917646
ABSTRACT:
A well casing scraping apparatus includes a generally cylindrical mandrel connected to a power driven rotatable work string or conduit. At least one peripheral ramp surface is formed on the mandrel and an annular scraping means is formed by the assembly of a plurality of externally toothed arcuate segments around the ramp surface portion of the tool support, with each segment having an internal arcuate ramp surface conforming to the adjacent portion of the mandrel ramp surface. Retaining sleeves are provided for the tool segments which not only retain the segments against radial outward movement but confine the segments axially to engagement with a particular portion of the ramp surfaces, whereby the effective working diameter of the segmented scraping means may be effectively controlled by changing the axial position of the retaining sleeves.
REFERENCES:
patent: 2464390 (1949-03-01), Hammer
patent: 3032114 (1962-05-01), Best
patent: 3251418 (1966-05-01), Condra
patent: 3757859 (1973-09-01), Hammon et al.
patent: 4189000 (1980-02-01), Best
Baker International Corporation
Leppink James A.
Norvell, Jr. William C.
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