APPOINTMENT:

It is used in perforating systems to provide an economical method of achieving the required depression between the tubing and the formation.

ADVANTAGES:
– an alternative to a landing nozzle with a plug;
– full passage after activation;
– use as a barrier to activate hydraulic equipment;
– high temperature properties;
– possibility of hydraulic testing of tubing up to 10,000 psi (68.9 MPa).