WELL TOOL

摘要

A well packer for sealing with a well casing wall including a tubular mandrel connectible with running and pulling -tools and a production tubing string seal assembly, a packer seal assembly on the mandrel having a soft plastic center element, harder plastic end elements, still harder annular support shoes having internal annular recesses to facilitate longitudinal compression and radial expansion, metal back-up shoes and metal shoe supports, an extrusion ring within the support shoes, a lower slip assembly including a one-piece C-shaped slip and an expander wedge for expanding and locking the slip, a lower slip assembly release ring mounted to produce a gap between the lower end of the packer seal assembly and the lower slip assembly to permit the metal back-up shoe to fold downwardly and inwardly to avoid casing obstructions, a releasable lock between the lower end of the mandrel and the lower slip assembly to hold the mandrel during setting and operation of the packer and to release the mandrel when pulling the packer, an upper slip assembly including an expander collet, a support ring within the collet for holding the collet during setting and operation and to release the collet for pulling, a one-piece C-shaped upper slip around the mandrel engageable with the collet, a locking slip segment assembly to lock the upper slip assembly against release with the mandrel, and a setting sleeve releasably engaged with the upper end portion of the mandrel and connected with the upper slip assembly. The packer is set by driving the setting sleeve downwardly relative to the mandrel setting the lower slip, expandthe packer seal assembly, and setting the upper slip. The packer is pulled by an upward force on the mandrel first releasing the upper slip, relaxing the packer seal assembly, and then releasing the lower slip.