Boring or penetrating the earth – Cutter element laterally shiftable below ground
Patent
1977-08-17
1979-02-27
Purser, Ernest R.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
175265, 175334, 175344, 175347, 175374, 1510413, E21B 928, E21B 932
Patent
active
041414217
ABSTRACT:
The present invention consists of an under reamer tool for enlarging, scraping or smoothing a well bore. The tool is attached to a conventional drill string above a conventional bit and involves cutting elements that have retractable cutters arranged for extension from the tool to engage the well bore wall, each cutter, when the drill string is turned, being urged outwardly by centrifugal force until it engages the well bore wall, continued turning thereafter, pulling that cutter into its extended cutting attitude, reaming the wall to the desired diameter, cutter retraction involving ceasing turning the drill string and the pulling of the drill string and connected tool from the well bore. During that pulling should the cutter contact a shoe or first reduction of the well bore casing or the wall thereof, it will be urged into a stowed attitude recessed within the tool body, the under reamer tool of the present invention also incorporating scouring openings provided in the tool body opposite to the cutter storage areas to pass liquid or air therethrough from the drill string to purge and clean that area within the tool body, allowing the cutter to travel freely therein.
REFERENCES:
patent: 1611071 (1926-12-01), Reed
patent: 1801265 (1931-04-01), Copelin
patent: 1837423 (1931-12-01), Foster
patent: 1899727 (1933-02-01), Sandstone
patent: 2085336 (1937-06-01), Sandstone
patent: 3977481 (1976-08-01), Fisk et al.
patent: 3990525 (1976-11-01), Penny
Nichols Jr. Nick A.
Purser Ernest R.
Russell M. Reid
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