Retrievable well packer

摘要

A retrievable well packer includes a packer mandrel with an expandable packing element disposed about the mandrel. Upper and lower shoes are received about the mandrel above and below the expandable packing element for compressibly engaging the packing element. A slip assembly is received about the mandrel for anchoring the packer within the well bore. Upper and lower wedges are received about the mandrel above and below the slip assembly for wedging the slip assembly radially outward upon longitudinal compression of the packing element. The mandrel is nonrotatably connected to each of the upper and lower shoes and upper and lower wedges for preventing rotation of those components relative to the mandrel in the event the packer must be milled out of a well bore. The mandrel is initially releasably longitudinally locked relative to the lower wedge by a releasing collet attached to a lower end of the mandrel and having radially outward extending lugs received within a groove of the lower wedge. A releasing sleeve is initially releasably held in a lower position to hold the lugs of the releasing collet in the groove of the lower wedge.