Sealing: When the positive pressure of the tubing reaches 6-8MPa, the up rubber is compressed and sealed. Rubber and barrel slip can not be reset under the action of unidirectional buckle of locking mechanism, and it can support sealing permanently.
At the same time, the lower setting mechanism (expanding seal) is started, and the long rubber cylinder expands under the internal pressure and contacts the inner diameter of the casing to seal the annulus of the oil separator sleeve.
Since the lower setting mechanism (expanding-seal) has a one-way slide valve, the packer does not release itself after pressure relief.