Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent
1991-05-03
1992-09-29
Britts, Ramon S.
Boring or penetrating the earth
With tool shaft detail
Helix or helically arranged structure
1753255, E21B 1722
Patent
active
051507579
ABSTRACT:
A component for attachment to a drillpipe which is part of a drillstring carrying a drillbit, said drillstring rotatably driven in a working direction, which drillpipe contains a standard box tool joint at one end and a standard pin tool joint at the other end, which tool joints are of a diameter greater than the section of drillpipe between the two joints, and which drillpipe component is comprised of two elongated cylindrical half sections for clamping over at least a portion of the narrower section of drillpipe and which component, on its outer surface, contains at least one helical pumping chamber having a twist, when viewed in axial elevation, opposite to that in which said drillstring is rotatably driven in said working direction, said pumping chamber, when view is traverse section, having an undercut portion relative to the surface of the drillpipe component, said undercut portion defining a lip.
REFERENCES:
patent: 3085639 (1963-04-01), Fitch
patent: 3194331 (1964-05-01), Arnold
patent: 3360960 (1968-01-01), Massey
patent: 4460202 (1984-07-01), Chance et al.
patent: 4811800 (1989-03-01), Hill et al.
patent: 4984633 (1991-01-01), Langer et al.
patent: 5040620 (1991-08-01), Nunley
Britts Ramon S.
Tsay Frank S.
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