PROJECTILE FOR CARRYING OUT DRILLING WITH BROKEN ROCK TRANSPORTATION BY REVERSE FLOW OF FLUSHING AGENT Russian patent published in 2004 - IPC

FIELD: mining industry, particularly drilling equipment.

SUBSTANCE: projectile comprises double column with outer and inner pipes and boring head. Arranged inside outer pipe is rock-receiving collector having inlet and outlet orifices and channels for flushing agent inflow. Boring head is connected with outer pipe and has channels for rock communication with inlet orifice of rock-receiving collector. Channels for flushing agent inflow are defined by concave and convex spherical surfaces, which pass into cylindrical annular nozzle. Radial channels formed in rock-receiving collector connect channels for flushing agent inflow with inlet orifices of rock-receiving collector. Cylindrical annular nozzle communicates with outlet orifice of rock-receiving collector.

EFFECT: increased efficiency of well bottom flushing.

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