Cross-flow Sealing Packer of PGMP-type is applied to ensure reliable isolation of gas-,
oil- and water-bearing formations in conditions where the well level is not at the wellhead.
The packer consists of two main units: sealing ring and protection unit against premature
actuation.
The packer works as follows: when the cementing plug is passing through the packer, it cuts
off the female pin opening thus liquid access to the thruster. This is how the preparation
for actuation is done. After receiving the “bump” signal and string pressure build-up till
the shear bolts failure level (which is set by selecting the required number of shear bolts
before the packer RIH). The thruster starts to move deforming the sealing rings in the axial
direction and pressing them against the borehole walls. The movement of the thruster is
fixed by a latch.