Seal-sub packer and a setting tool therefor

A seal-sub packer assembly, comprising:

• a packer adapted for positioning inside a casing, the packer comprising a first lower mandrel provided with interior threads and at least one compressible expandable sealing member mounted on an exterior of the lower mandrel, a second upper mandrel mounted in circumferential relationship over at least a portion of said lower mandrel above said at least one sealing member and releasably secured thereto by at least one shear screw;
• a liner hanger engageable with said lower mandrel below said at least one sealing member, said liner hanger comprising an elongated cylindrical body and an annular band mounted in a limited sliding relationship over said body, said band being provided with an inverted J-shaped slot, said slot being adapted to receive a pin fixedly attached to and extending outwardly from said body through said slot;
• and
• a setting tool engageable with said interior threads of said lower mandrel for setting the packer inside the casing, said setting tool comprising an enlarged diameter ring which contacts a top edge of said upper mandrel, and whereby application of a predetermined downward force on said setting tool moves said upper mandrel downwardly, shearing said at least one shear screw and causing vertical compression and horizontal expansion of said at least one sealing member in with contact an interior wall of said casing.