Development and application of new Y445 pressure difference release packer

The current release packer has problems,suck as high and destabilize release pressure,low success ratio of release and unset,The Y441 packer and release string always release at midway for the shock of hydraulic.Compared to current packer,the new Y445 release packer has integrated multi capacities,for the release piston uses structure of area difference,it makes the packer can adopt two release methods of throw ball and without throw ball,it also enhanced release success ratio,at the same time,the back off structure uses mechanical release with lower cone,which enhanced success ratio of back off.Before march 2005,this instrument has been applied to 50 wells and all get success,which receive favorable economic and society benefit.