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Usage：Dual locking packer is one type of hanging packer which has a large ID, with bypass, and could seal double sides of pressure. By rotation and pull up & down string tools to set and unset, could be used in middle or shallow casing well for DST testing, acidification, cementing and etc.
Structure feature：Includes of special mechanical locking system and double slips structure, which could seal any pressure from top or bottom of Packer after setting and without increase drill pressure, if pull up of Packer, could not unset either. |
