Tubular drill string member with contoured circumferential surfa

Details Tubular drill string member with contoured circumferential surfa Tubular drill string member with contoured circumferential surfa

1980-11-28

1982-12-28

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

175325, 175 61, E21B 1716, E21B 1722

Patent

active

043656781

ABSTRACT:
A tubular member for a drill string used in the rotary drilling of deviated boreholes, which includes an outer circumferential surface which is contoured and adapted to engage the wall of the borehole so as to produce a longitudinally downward force on the drill bit upon rotation of the drill string. The tubular member may be a drill collar or section of drill pipe, wherein the contoured surface is constituted of a helical thread of a pitch which will impart a longitudinal force towards the drill bit upon rotation of the tubular member.

REFERENCES:
patent: 2869828 (1959-01-01), McClinton
patent: 2999552 (1961-09-01), Fox
patent: 3085639 (1963-04-01), Fitch
patent: 3194331 (1965-07-01), Arnold
patent: 3360960 (1968-01-01), Massey
patent: 3372763 (1968-03-01), Fischer
patent: 3762828 (1973-10-01), Faber
patent: 4036539 (1977-07-01), Saunders et al.

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