BOREHOLE DEVICE FOR GENERATING DIRECTED RUPTURES Russian patent published in 2010 - IPC E21C37/00 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to mining and can be implemented for extraction of valuable crystal raw material and natural stone, for clearing blockages and constructions and for crushing lumps. The device consists of a tubular shell filled with plastic substance. A plug is installed into one end of it, while a cartridge is screwed on another end; the cartridge has a central aperture with thread wherein there is screwed a screw with a handle. Lengthwise slots are cut in the tubular shell; between its internal surface and plastic substance there is installed the pipe with lengthwise slots so, that lengthwise slots of the tubular shell and the pipe coincide in plane of crack forming and do not coincide in other places. An elastic shell is put on the tubular shell.

EFFECT: increased efficiency of device due to thrust of not only walls of borehole, but also surface of generated crack by means of supply of plastic substance into it under pressure, also increased reliability of operation due to simplification of design.

2 cl, 2 dwg