Wellhead assembly and method for an injection tubing string

Details Wellhead assembly and method for an injection tubing string Wellhead assembly and method for an injection tubing string

E - Fixed Constructions

21

B

E21B 33/068 (2006.01)

Patent

CA 2674688

A wellhead assembly (10) for an injection tubing string is provided which allows a master valve to be closed without damaging the injection tubing siring 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 (15) adapted to be connected between a wellhead and a Christmas tree. The assembly also includes a mandrel (20) 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 (25) 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 (25) includes communication passageway for facilitating fluid communication between the port of the mandrel and the injection tubing string.

L'invention concerne un ensemble de tête de puits (10) pour une colonne d'injection qui permet de fermer une vanne maîtresse sans endommager la colonne d'injection tout en permettant l'utilisation d'une vanne de contre-pression pour isoler l'arbre. Les ensembles de tête de puits et les procédés de la présente invention y afférents comprennent une bride (15) adaptée pour être reliée entre une tête de puits et un arbre de Noël. L'ensemble comprend aussi un mandrin (20) adapté pour être inséré dans l'alésage longitudinal de la bride. Le mandrin présente un orifice conçu pour communiquer avec un orifice d'injection qui s'étend radialement à travers la bride. L'ensemble comprend en outre un dispositif de suspension (25) adapté pour être raccordé à l'extrémité supérieure de la colonne d'injection. Le dispositif de suspension est en outre adapté pour être placé dans l'alésage longitudinal du mandrin. Le dispositif de suspension (25) comprend un passage de communication pour faciliter la communication fluidique entre l'orifice du mandrin et la colonne d'injection.

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