| 摘要 |
A retrievable well packer is shown of the type adapted for releasable setting within a well conduit. The packer has a central mandrel extending within an outer assembly, seal members carried on the outer assembly for sealingly engaging the conduit, anchoring slips carried on the outer assembly for grippingly engaging the conduit, and a hold down piston-collet assembly for releasably connecting the mandrel to the outer assembly to maintain sealing and gripping engagement between the seal members an anchoring slips and the conduit. The collet is movable between a locking position in contact with the piston whereby the mandrel is connected to the outer assembly, and a release configuration out of contact with the piston whereby the mandrel is released for longitudinal movement relative to the outer assembly. A shear wire fixes the piston in the locking configuration in contact with the collet. The shear wire has a preselected shear index, whereby a predetermined increase in well annulus pressure over pressure inside the central mandrel shears the shear wire to release the hold down piston.
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