Patent ID: 7992635

Claim:
A wear-resistant sealing system for introducing fracturing fluids to a wellhead comprising: a lower tubular structure having an axially extending and lower bore in fluid communication with the wellhead, the lower bore terminating at a lower terminating shoulder; a frachead for fluidly connecting to the lower tubular structure forming an interface therebetween, the frachead having one or more fluid ports in communication with an axially extending main bore; a wear-resistant tubular connector having a bottom, the tubular connector fit to the main bore and fit to the lower bore, the tubular connector extending from the main bore of the frachead into the lower bore of the lower tubular structure for forming an axially extending, contiguous bore bridging across the interface, for fluid communication of fracturing fluids from the frachead to the lower tubular structure and wellhead; at least an upper seal in a first annulus formed between the tubular connector and the frachead for sealing the first annulus from the interface; and at least a lower seal in a second annulus formed between the tubular connector and the lower tubular structure for sealing the second annulus from the interface; wherein the frachead engages the tubular connector to drive the bottom of the tubular connector to fully engage the lower terminating shoulder of the lower tubular structure for protecting both the main bore and the lower bore; and wherein the at least an upper seal and the at least a lower seal isolate the interface from the fracturing fluids.