Patent ID: 6666266
Filing Date: 2003-12-23
Classification: E21B

Abstract:
A wellhead isolation tool for injecting substances through a wellhead into a well, the wellhead defining a longitudinal passage therethrough, the wellhead isolation tool comprising:a mandrel defining a mandrel flow passage therethrough and having a non-threaded outer surface, the mandrel having upper and lower ends; a sealing device at the lower end of the mandrel for sealingly engaging an element in the well; at least one valve connected to the upper end of the mandrel, wherein the substances to be injected into the well may be communicated through the at least one valve into the mandrel flow passage when the at least one valve is in an open position; a threaded drive rod for reciprocating the mandrel through the wellhead into and out of the well, the threaded drive rod being vertically aligned with the mandrel; and a coupling for connecting the at least one valve to the threaded drive rod.