FIELD: soil or rock drilling; mining.
SUBSTANCE: group of inventions relates to an axial-action cup packer and a method for its activation. Axial-action cup packer comprises mandrel with packer element arranged thereon to isolate annular space of the well. Packer element is bowl-shaped, fixed on mandrel with one end and open by other end to form appropriate cavity closed on the side of open end of packer element by clamping ring. Pressure ring is installed on mandrel with possibility of movement and compression of packer element by axial force. On the mandrel in the cavity a spacer is installed, which is made with the possibility of limitation of the clamping ring mobility. Spacer is fixed on mandrel with thrust ring. Upper end of hold-down ring interacting with packer element has holes with possibility of fluid flow from outer surface of hold-down ring into cavity, performing additional hydraulic pressure of liquid flow for compression of packer element, and other lower end of clamping ring is connected by means of thread with lower branch pipe. Locking ring with teeth engaged with mandrel mating surface in packer transport position is installed on mandrel, locking ring is made with possibility of protection against early activation of packer, locking ring by one lower end contacts with support surface of lower branch pipe, and by other upper end - with lower end of fixing semi-rings. Hold-down ring and the lower branch pipe are installed on the mandrel by means of fixing semi-rings and locking ring so that the semi-rings are installed between the ends of the hold-down ring and the locking ring and are made with possibility of limited axial movement relative to the mandrel in its profile.
EFFECT: technical result is improved reliability of packer and entire layout for repeated hydraulic fracturing of formation, as well as increased number of stages of hydraulic fracturing of formation without lifting assembly to surface.
11 cl, 5 dwg
