Wells – Processes – Cyclic injection then production of a single well
Reexamination Certificate
2011-05-03
2011-05-03
Bagnell, David J (Department: 3672)
Wells
Processes
Cyclic injection then production of a single well
C166S075140, C166S097100
Reexamination Certificate
active
07934550
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 flange adapted to be connected between a wellhead and a Christmas tree. The assembly also includes a mandrel adapted to being inserted into the longitudinal bore of the flange, the mandrel having a port for communicating with an injection port which extends radially through the flange. 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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Bolding Jeffrey L.
Cole Blane
Hill, Jr. Thomas G.
Bagnell David J
BJ Services Company U.S.A.
Sayre James G
Zarian Midgley & Johnson PLLC
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