DEVICE FOR HYDRAULIC FRACTURE OF ROCKS IN WELL Russian patent published in 2011 - IPC E21B43/26 E21C39/00 

FIELD: mining.

SUBSTANCE: device comprises a cylindrical vessel with a channel for fluid supply, sealing elements installed at its ends, the mechanism of compression of the latter in the form of a piston pair with a hole in the cylinder installed on the body between the sealing elements. There is a check valve installed in the cylindrical vessel at the side of the end. There are two channels arranged in the cylindrical vessel, the first of which is connected to the working chamber of the piston pair, and the second one - with the hole in its cylinder. In the cylindrical body there is a slide installed with a journal in the middle part. One end of the slide rests against a spring installed in the prevalve cavity of the check valve, and the other end enters the circular bore made in the cylindrical vessel and communicated with the postvalve cavity of the check valve and the first channel. At the same time the specified slide is installed with the possibility of axial displacement and communication of the second channel with the channel for fluid supply.

EFFECT: increased reliability of device operation due to simplification of the process of its control.

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