Patent ID: 7934550
Filing Date: 2011-05-03
Classification: E21B

Abstract:
1. A wellhead assembly for an injection tubing string, the wellhead assembly comprising: a flange adapted to be connected to a wellhead, the flange having a longitudinal bore therethrough and an injection port, the injection port extending through the flange and communicating with the longitudinal bore of the flange; a mandrel adapted to be inserted into the longitudinal bore of the flange, the mandrel comprising a longitudinal bore therethrough and a port, the port extending through the mandrel and communicating between the injection port of the flange and the longitudinal bore through the mandrel; and a hanger connected to an injection tubing string, the hanger being adapted to land in the longitudinal bore of the mandrel, the hanger comprising a communication passageway which facilitates fluid communication of injected fluids between the port of the mandrel and the injection tubing string, the hanger further comprising a longitudinal flow area therethrough for the production of fluids from a wellbore and up past the hanger.