RU94044685A - Device for formation of directional fractures in holes - Google Patents

Abstract

FIELD: mining; may be used in formation of fractures in holes with the aim of degassing coal and salt beds, separation of blocks from rock mass, mining of valuable crystalline raw material and building stone. SUBSTANCE: device has body with annular taper projection, central channel for intake of working fluid and radial holes for discharge of working fluid, hole for supply of working fluid and hole for discharge of working fluid. Screwed into end of the body is reducing bushing to which chamber with elliptical cross-section is attached and made of material possessing the effect of shape memory. Secured to chamber surface in the plane of its large axis of cross-section are wedges. Connected to chamber is tube passing through body along its axis and to pipe union screwed into hole. Fitted on the body is flexible tube pressed from one end to body by bushing with internal taper surface by means of nut, and with its other end, it adjoins the annular conical projection. The device having pipe union with gasket is installed in hole at the required depth and preset orientation. Supplied through the pipe union is high-viscosity working fluid to form directional fracture. EFFECT: higher efficiency of fracture formation due to simultaneous action on rock by wedges and hydraulic pressure. 4 cl, 3 dwg

Claims (1)

The invention relates to mining and can be used for cracking in wells with the aim of degassing coal and salt formations, separating blocks from massifs, mining valuable crystalline raw materials and building stone. It allows you to increase the efficiency of cracking by simultaneously exposing the rock to wedges and hydrostatic pressure. To do this, in the case with an annular conical protrusion, a central supply channel and radial openings for the outlet of the working fluid, an adapter sleeve is screwed into the housing for supplying the working fluid and the hole at the end, to which a camera with an elliptical cross-section of material with a shape memory effect is attached. On the surface of the chamber in the plane of the major axis of its cross section, wedges are fixed. A tube is connected to the camera, which is passed through the cavity of the housing along its axis and brought to the fitting screwed into the hole. An elastic tube is mounted on the housing, pressed from one end to the housing by a sleeve with an inner conical surface by means of a nut, and the other end adjacent to the annular conical protrusion. The device is equipped with a fitting with a gasket. The device is installed in the well at the required depth and with a given orientation. A highly viscous working fluid is supplied through the nozzle, resulting in the formation of a directional crack.