Patent ID: 6494257
Filing Date: 2002-12-17
Classification: B24B,E21B,F16K

Abstract:
A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising:a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore; a tubing hanger which is supported in the central bore and which includes a production bore that extends axially therethrough and a production passageway that communicates between the production bore and the production outlet, the tubing hanger supporting a tubing string which extends into the well bore and defines a tubing annulus surrounding the tubing string; a first closure member which is positioned in the production bore above the production passageway; a first annular seal which is positioned between the tubing hanger and the central bore above the production passageway; wherein the first closure member and the first seal comprise a first pressure-containing barrier between the well bore and a surrounding environment; a second closure member which is positioned in the production bore above the first closure member; a second annular seal which is positioned between the tubing hanger and the central bore above the first seal; wherein the second closure member and the second seal comprise a second pressure-containing barrier between the well bore and the environment; wherein both the first and the second barriers are associated with the tubing hanger; and a tree cap which comprises: an annular non-metallic body; means for securing the body to the tubing hanger or the tubing spool; an annulus seal stab for engaging an annulus bore which extends through the tubing hanger and communicates with the tubing annulus; a fluid coupling which is mounted on the body and which is adapted to be connected to an external service and control line; and a conduit which communicates between the fluid coupling and a bore in the annulus seal stab; wherein fluid communication may be established between the annulus bore and the external service and control line through the annulus seal stab.