Square drill collar featuring offset mass and cutter

Details Square drill collar featuring offset mass and cutter Square drill collar featuring offset mass and cutter

1998-03-05

2000-03-21

Bagnell, David

Boring or penetrating the earth

With tool shaft detail

1753251, 175406, E21B 1700

Patent

active

060391308

ABSTRACT:
This disclosure is directed to an improved drill collar having pin and box connection in an elongate hollow member. In cross-section, the drill collar is formed of a square billet defining three rectangular corners. The fourth corner is rounded thereby reducing the weight in that area and thereby creating an eccentered center of mass and mass moment of inertia. A cutter is located along one of the edges so that the cutter scuffs against the well borehole during rotation to thereby enhance circular configuration and to reduce key seating or deviation.

REFERENCES:
patent: 747575 (1903-12-01), Baker
patent: 3231033 (1966-01-01), Williams
patent: 3237705 (1966-03-01), Williams
patent: 5328304 (1994-07-01), Kress et al.
Bingman, W.E., "Square Pegs in a Round Hole"; Mar. 19, 1962, Oil and Gas Journal pp177-181.

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