Wells – Above ground apparatus – With means for inserting fluid into well
Reexamination Certificate
2011-03-29
2011-03-29
Bagnell, David J (Department: 3672)
Wells
Above ground apparatus
With means for inserting fluid into well
C166S263000
Reexamination Certificate
active
07913754
ABSTRACT:
A wellhead assembly for an injection tubing string is provided which allows a master valve to be closed without damaging the injection tubing string while still allowing for the use of a back pressure valve to isolate the tree. Wellhead assemblies and related methods of the present invention include a wellhead apparatus adapted to be connected to a wellhead. The assembly also includes a mandrel adapted to being inserted into the longitudinal bore of the wellhead apparatus, the mandrel having a port for communicating with an injection port which extends radially through the wellhead apparatus. The assembly further includes a hanger adapted to connect to the upper end of the injection string, wherein the hanger is further adapted to land in the longitudinal bore of the mandrel. The hanger includes a communication passageway for facilitating fluid communication between the port of the mandrel and the injection tubing string.
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Bagnell David J
BJ Services Company U.S.A.
Sayre James G.
Zarian Midgley & Johnson PLLC
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