DRILLING METHOD OF HARD ROCKS WITH HYDROTRANSPORT OF CORE SAMPLE AND DRILLING ASSEMBLY FOR ITS IMPLEMENTATION Russian patent published in 2010 - IPC E21B7/00 E21B44/00 

FIELD: mining.

SUBSTANCE: drilling method includes definition of critical speed of upstream of wash liquid, W_cr. Additionally sinking speed is held not more than critical value W_Mcr. Core sample during drilling is separated for column of specific length h. Drilling assembly contains core breaker located in casing of diamond reamer so that distance of boring bit is defined from mathematics. Additionally wear resistance of core breaker material is higher that wear resistance of casing material of dilator, and total area of cross sections of flushing ports of dilator, total area of cross sections of external side channels of diamond crown, total area of longitudinal section of its butt channels and total area of cross sections of internal side channels are in ratio.

EFFECT: productivity improvement of drilling.

2 cl, 2 dwg