Patent ID: 6470968
Filing Date: 2002-10-29
Classification: E21B

Abstract:
A subsea wellhead completion system comprising:a wellhead housing having a wellhead internal bore and adapted to be supported on a seabed; a tree disposed above and mounted said wellhead housing, said tree having an tree internal bore and a fine alignment key for aligning said tree with said wellhead housing; connecting means for connecting said tree to said wellhead housing and providing fluid communication between said tree internal bore and said wellhead internal bore; a tubing hanger disposed in said tree internal bore and having a production tubing string and an annular tubing string extending downwardly therefrom; said tree having a plurality of ports selected from the group comprising: at least one radial production port for communication of said bore with an external production line; at least one annular access port for communication of said bores with an annular access line; and at least one additional port for hydraulic connection to said internal bore; said tubing hanger further having gate means, said gate means comprising slidably engagable gates, each gate having a gate port, and wherein said gates are moveable to open and close one or more of said production port, said annular access port, and said additional port; means comprising a running tool deployable in communication and operative association with said tubing hanger whereby said running tool can manipulate said slidably engagable gates and wherein said tubing hanger comprising said slidably engagable gates is in communication with a means for relatively retracting or extending outer seals of said tubing hanger and wherein said gates are moveable in a direction parallel to the axis of the tubing hanger to thereby cam said means for retracting or extending in a direction perpendicular to the axis of said tubing hanger to thereby extend or retract said outer seals of each bore, said means for retracting or extending further providing axial sliding movement of said gates between said production port, said annular access port and said additional port, providing alternatively, a blocking position sealing against an inner seal and an unblocking position for fluid communication with each of said ports, said tubing hanger and said tree.