Reverse-circulation drilling method and system

Details Reverse-circulation drilling method and system Reverse-circulation drilling method and system

2007-11-06

2007-11-06

Bagnell, David (Department: 3672)

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

C175S103000, C175S217000

Reexamination Certificate

active

11221805

ABSTRACT:
A reverse-circulation drilling method and system includes a drill bit, a drill string having drill rods, and a rotary table or power swivel for bringing the drill bit into rotation by means of the rods. The system includes a positive-displacement pump made up of a stator and of a rotor, the stator being inserted in the drill rods, and the rotor being assembled to operating rods arranged within the drill rods.

REFERENCES:
patent: 4137975 (1979-02-01), Pennock
patent: 4223747 (1980-09-01), Marais
patent: 4669555 (1987-06-01), Petree
patent: 5230388 (1993-07-01), Cherrington
patent: 6305469 (2001-10-01), Coenen
patent: 0244076 (1987-11-01), None

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