FIELD: mining.
SUBSTANCE: group of inventions relates to sliding couplings and methods of borehole treatment with fluid medium. Sliding coupling opened by released plug, comprises housing forming first channel and forming flow passage opening, maintaining first channel communication with space outside of housing; inner bushing forming second channel and axially displacing inside first channel from closed position into open position relative to flow passage opening, wherein second channel has transition collar and installed in it coupling collar; and compressible seat installed in first axial position, coupled in thrust with transition collar in internal bushing second channel. In first axial position compressible seat has expanded state and coupled with released plug with first contact size, in which coupled plug is pressed through. Compressible seat axially displaces inner bushing into open position with supply of fluid medium pressure acting on coupled plug. Compressible seat is made with possibility of movement from first axial position, passing transition collar, into second axial position, coupled in thrust with coupling collar, and contracts from expanded state into contracted state under action of fluid medium supplied pressure. Compressible seat, transformed into contracted state in second axial position, is compressed with second contact size, which is smaller than first contact size, and squeezed in thrust against coupled plug pressed through into compressible seat.
EFFECT: technical result consists in provision of plug jammed setting in order to receive high pressure, facilitation of plug drilling out, excluding its chipping or cutting at edges.
17 cl, 16 dwg
