JET-EJECTOR HEAD OF DRILL BIT Russian patent published in 2004 - IPC

FIELD: roller drill bits with jet heads, particularly flushing units of roller bits for drilling oil and gas wells.

SUBSTANCE: head has body secured in flushing channel of drill bit. Body has inner cavity of variable cross-section including suction chamber with ejection orifices. Inner cavity has upper, medium and lower parts. Upper part is shaped as truncated cone or conoid with inlet orifice communicating with flushing channel. Outlet orifice thereof is directed to medium part including suction chamber, which is formed as widened area in bit body and communicates with low part. Low part is made as acceleration chamber and has cylindrical shape.

EFFECT: increased mechanical speed of well boring due to increased ejection effect and dynamic head of created jet, increased operational bit reliability.

2 cl, 1 dwg