METHOD FOR ORIENTED HYDRAULIC FRACTURING OF ROCKS AND DEVICE FOR ITS REALISATION Russian patent published in 2012 - IPC E21B43/26 

FIELD: mining.

SUBSTANCE: method includes boring of initiating wells, development of initiating cavities in wells, sealing of these cavities and formation of hydraulic fracturing cracks of rocks by injection of liquid in them. Initially the first crack is formed, solid horizontal one, and then the second crack is formed underneath, solid horizontal one. The second crack is developed until its surfaces reach the lower surface of the first crack. After that the second crack is filled with hydraulic insulation material. The device comprises a hollow cylindrical body with radial holes. There are bars installed at the ends of the body. A bushing from elastic material with radial holes is placed onto the body. At the same time radial holes in the body and the elastic bushing do not match each other, and there is a plug on the end of the lower hose that is free from the body.

EFFECT: increased efficiency of oriented hydraulic rupturing of rocks due to development of a layer in the rock massif that is not permeable for liquids with curved surfaces and reliable operation of the device due to simplification of its design and automatic sealing of the well without usage of collars that tear against the rock.

4 cl, 2 dwg