Design Optimization of Pressure Transmission System of Annulus Pressure Firing Perforated String

Based on comparison of firing procedures of tubing conveyed perforation currently in use in China,irrational sealing design of annulus pressurizing and pressure trans-mitting system is believed to be the cause of that the perforated string of annulus pressurized tubing conveyed perforation cannot support high pressure and is not suit-able for use in deep wells or in wells with slow pressure build-up.After design optimization,the sealing pressure that the annulus pressurizing and pressure transmitting system can support is over70MPa and surface pressure testing can be performed.