DIAMOND DRILLING TOOL Russian patent published in 2014 - IPC E21B10/46 

FIELD: mining.

SUBSTANCE: invention refers to rock-destructing tools, and namely to drilling crowns and bits with diamond equipment for well drilling with selection of core and a continuous face. A diamond drilling tool includes a housing with a connection thread and a matrix reinforced with diamonds arranged in several rows in holes of templates made from softer material in comparison to matrix material. The housing is equipped with several tightly closed chambers provided with return valves spring-loaded in an axial direction with a compression spring and located on the side of the matrix working face; besides, the compression spring is arranged in the chamber cavity and rigidly attached to the housing.

EFFECT: improving operating efficiency due to cleaning of the working face from destructed particles of diamonds of the lower layer.

3 cl, 1 dwg