Wellhead isolation tool and method of use

Abstract From the Canadian patent

A wellhead isolation tool is disclosed that is unique because the tool has no direct connection between the high pressure valve and the mandrel. Well stimulation fluids are pumped through one or more high pressure bores which communicate with a mandrel injection head that directs the fluids into the mandrel. The injection head and the mandrel are enclosed in a sealed bore and reciprocatably movable with a piston which is used to stroke the mandrel into and out of a wellhead ant to lock the mandrel in an operating position wherein ports in the injection heat are aligned with the high pressure bores. The tool provides superior safety features and ease of operation.