DRILL PIPE Russian patent published in 2017 - IPC E21B10/04 E21B25/00 

FIELD: mining engineering.

SUBSTANCE: drill pipe contains a diamond bit with a matrix separated by flushing channels and annular grooves, a core receiver and a centraliser to stabilise it. The centraliser is rigidly placed in the matrix cavity and has internal polar grooves, in the lower end with inclined bend oriented to the gap between the core receiver end and the matrix opposite to diamond bit rotation. Flushing channels are made on the end face of matrix with rounded turn opposite to diamond bit rotation and are hydraulically connected to the annular grooves that have a unidirectional outlet with them.

EFFECT: alignment of core receiver and diamond bit with generation of the combined torque with drill pipe components.

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