A DRILL ASSEMBLY FOR PERCUSSIVE DRILLING, A DRILL BIT AND A DRILL STRING ELEMENT

A DRILL ASSEMBLY FOR PERCUSSIVE DRILLING, A DRILL BIT AND A DRILL STRING ELEMENT

A drill assembly for percussive drilling, includes a drill bit having a downhole portion and an attachment portion having a cylindrical male coupling thread, and a drill string element for transferring impacts from a percussion device to the drill bit and having a female coupling thread for threaded...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KOSKINEN, Mika, ALA-KANTO, Kimmo
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:A drill assembly for percussive drilling, includes a drill bit having a downhole portion and an attachment portion having a cylindrical male coupling thread, and a drill string element for transferring impacts from a percussion device to the drill bit and having a female coupling thread for threadedly coupling with the male coupling thread. The drill bit includes a first annular impact surface arranged on an uphole-side end the downhole portion, the first annular impact surface surrounding the attachment portion, and the drill string element includes, at a downhole-side end thereof, a second annular impact surface. The first and second impact surfaces are inclined with respect to a plane perpendicular to the longitudinal direction. A drill bit and drill string element are also disclosed.