Patent ID: 7708062

Claim:
A retrievable downhole packer assembly for sealing against a section of a casing into a wellbore, the packer assembly comprising: a mandrel; a valve assembly comprising a valve body and a valve seal, with the valve body being slidably and axially mounted in the mandrel to move into and out of sealing contact with the valve seal; at least one seal cup mounted in a seal cup-carrying sleeve, an annular gap defined between the valve body and the mandrel, a piston support connected to an upper end of the mandrel, the piston support carrying a plurality of pistons capable of radially extending against the casing to anchor the mandrel into a position within the casing, and a seal retaining nut that retains the valve seal against the mandrel and the piston support, wherein the valve body slidably moves along the mandrel between a closed position with the valve body in sealing contact with the valve seal to prevent any fluid flow through the annular gap, and an open position with the valve body out of sealing contact with the valve seal to permit any fluid flow through the annular gap.