Core drill bit

Details Core drill bit Core drill bit

1994-01-10

1995-01-10

Britts, Ramon S.

Boring or penetrating the earth

Bit or bit element

Core forming type

E21B 1002

Patent

active

053798520

ABSTRACT:
A core drill bit having a nozzle screen and designed for drilling into an underground formation and obtaining samples of the formation. As the bit cuts through the formation, a core of the formation material is forced upwardly through the drill bit into the attached core barrel and drilling fluid is pumped from the surface, through the core barrel and the screen mounted in the body of the bit and subsequently, through jet nozzle orifices radially arranged in the crown of the bit. The screen prevents oversized formation fragments, gravel and debris from lodging in the jet nozzles and obstructing the nozzle orifices and thus facilitates unobstructed flow of drilling fluid through the jet nozzles.

REFERENCES:
patent: 443072 (1890-12-01), Chapman
patent: 1163867 (1915-12-01), Shaffer
patent: 1172139 (1916-02-01), Jenkins
patent: 1193468 (1916-08-01), Okell
patent: 2312176 (1941-01-01), Kotowski

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