Seat sealing ball seat with function is opened to secondary

The utility model discloses a seat sealing ball seat with function is opened to secondary for the segmentation of oil gas field open hole packer is reformed transform and is replaced thick liquid, open hole packer seat to seal before the tubular column seat seals. Constitute by body, sealing washer, a seat sliding sleeve, a seat sliding sleeve shear pin, intercommunication sliding sleeve, circulation port, intercommunication sliding sleeve shear pin, fracturing port, catch, hasp. The utility model discloses the connection is pressure differential sliding sleeve lower extreme in open hole packer completion pipe string, and the float collar upper end can play and provide liquid circulation channel before the seat seals, sit the effect of sealing the packer and providing reserve fracturing passageway. It has compensatied behind the packer setting and to have aroused that first section can't the fracturing and then lead to the condemned defect of full well because accidental reason pressure differential sliding s