Drill bit

Details Drill bit Drill bit

2005-12-06

2005-12-06

Tsay, Frank S. (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S417000

Reexamination Certificate

active

06971458

ABSTRACT:
A drill bit for drilling a borehole into an earth formation is provided. The drill bit has a central longitudinal axis and a bottom surface facing the borehole bottom during drilling with the drill bit, and comprises primary fluid injection means arranged at the bottom surface and located at a selected radial distance from the central longitudinal axis, the primary fluid injection means being arranged to eject a primary stream of fluid into the borehole, the primary stream having a component in a transverse plane of the drill bit, directed from the fluid injection means to the central longitudinal axis.

REFERENCES:
patent: 3688852 (1972-09-01), Gaylord et al.
patent: 4494618 (1985-01-01), Radtke
patent: 4687066 (1987-08-01), Evans
patent: 4730682 (1988-03-01), Ditzig
patent: 4819746 (1989-04-01), Brown et al.
patent: 5794725 (1998-08-01), Trujillo et al.
patent: 5803187 (1998-09-01), Javins
patent: 6089336 (2000-07-01), Nexton et al.

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