Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent
1990-03-23
1991-08-27
Britts, Ramon S.
Boring or penetrating the earth
With tool shaft detail
Helix or helically arranged structure
175325, E21B 1722
Patent
active
050426001
ABSTRACT:
The drilling of highly angulated wellbores (with a rotary rig having a drill string terminated with a bit wherein drilling fluid is employed) is improved by employing in the highly angulated drill string a length of drill pipe which has a helical ridge disposed thereabout such that the flight of the helical ridge is wound so as to rise from the bit with the rotation of the drill string and the height of the helical ridge above the length of the surface of the drill pipe is 1 to 15 percent of the diameter of the drill pipe.
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Finnegan John E.
Williams Jerry G.
Britts Ramon S.
Conoco Inc.
Reinert A. Joe
Schoeppel Roger J.
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