Retrievable Packers
A retrievable packer Can be defined as a subsurface tool that runs as a part of the completion string to provide a seal between the casing and tubing and can also be set and retrieved with wireline, mechanical or hydraulic mechanism.

Designed By Drilling Manual Team

The major difference than other types of packers (permanent packers) is that they can be removed from the well by tubing manipulation or some other means not involving the destruction of the packer.
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