A method of increasing the pack-off force to a packer or bridge plug.

摘要

A method of increasing the pack-off force to a packer or bridge plug 300 by applying a differential pressure to the tool is disclosed. A differential pressure moves mandrel 302 within the downhole tool 300. Pressure is applied from below the set downhole tool 300 and the mandrel 304 may move upward U while the upper cone 310 and upper slip assembly 306 remain stationary. As the mandrel 304 moves upward, the upper cone 310 and the upper lock ring 316 may slightly separate. To maintain energization of sealing element 322 and further energize the sealing element 322, the secondary lock 350 is configured to couple the upper lock ring 316, disposed in the gage ring 320, and the upper cone 310. The threaded portion 374 of the mandrel 304 ratchets upward through the upper lock ring threaded portion 372.