Element of a rotating drill pipe string

Details Element of a rotating drill pipe string Element of a rotating drill pipe string

1998-03-16

2000-05-02

Tsay, Frank

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

1753251, E21B 1722

Patent

active

060560738

ABSTRACT:
A rotating drill pipe string element (1) includes at least one portion (2a) of tubular shape whose external surface has at least one groove (8a, 8b, 8c, 8d, 8e) arranged in a helix having as an axis the axis (O) of the tubular portion (2a). The groove (8a, 8b, 8c, 8d, 8e) has a cross-section in a plane perpendicular to the axis (O) of the portion having an undercut part (10) lying to the rear of a radius (OA) of the cross-section of the tubular portion, (2a), the radius passing through the external end (A) of the area of the groove (8c) lying to the rear, with respect to the forward direction of rotation of the pipe string of the groove (8c) with respect to the forward direction of rotation (.OMEGA.) of the pipe string.

REFERENCES:
patent: 3085639 (1963-04-01), Fitch
patent: 3338069 (1967-08-01), Ortloff
patent: 3749189 (1973-07-01), Boehm
patent: 4210215 (1980-07-01), Peetz et al.
patent: 4285407 (1981-08-01), Samford
patent: 4854399 (1989-08-01), Zijsling
patent: 4874045 (1989-10-01), Clayton
patent: 4949797 (1990-08-01), Isom
patent: 4995466 (1991-02-01), Snow, Jr.
patent: 5040620 (1991-08-01), Nunley
patent: 5937957 (1999-08-01), Swietlik

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