| 摘要 |
An improved packer is provided which is adapted to be anchored in a well casing against longitudinal movement in either direction, but which is also retrievable without damage to either the packer or the casing. The packer is equipped with conventional slips and cones located on opposite sides of a conventional elastic packing body. Separate upper and lower mandrel sections are provided with their ends abutting each other adjacent the packing body. The packer is anchored by conventional setting techniques and equipment, and may be retrieved by drawing the upper mandrel away from the lower mandrel. The compressed packing body then relaxes inwardly into the gap separating the ends of the mandrels, thereby releasing backup pressure on the cones. Thereafter, first the upper slip is drawn out of engagement with the casing, and then the lower cones and slip is carried out of engagement with the casing by further upward travel of the upper mandrel.
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