FIELD: mining. SUBSTANCE: injection is provided at section length exceeding injector operating length. The injector does not withdrawn out of the well. Hydraulic fracture is prevented due to reliable well orientation and pressure maintaining in sealing shell below hydraulic fracture design pressure at the expense of providing the injector with radial gap sealing unit. The unit is made in the form of cylindrical elastic shell placed between coils of warm conveyor winding out of area of lateral openings and fastened on tube outside. Tube outer diameter in the area of shell location is smaller by four thickness of cylindrical elastic shell wall than the diameter of the rest tube part. EFFECT: higher reliability. 2 cl, 2 dwg
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