Well operations system

  • US 7,093,660 B2
  • Filed: 02/13/2003
  • Issued: 08/22/2006
  • Est. Priority Date: 06/01/1992
  • Status: Expired due to Fees
First Claim
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1. An assembly for supporting tubing within a well having a wellhead housing and for selective use with a blowout preventer having a BOP bore comprising:

  • a subsea tree adapted for disposal below the blowout preventer and fixed and sealed to the wellhead housing, said subsea tree having a wall with a central bore therethrough and a first lateral port connected to a valve, said central bore having an internal surface and adapted to form a common passageway with the BOP bore;

    a tubing hanger landed and sealed within said subsea tree at a predetermined angular position at which a second lateral port in said tubing hanger is in alignment with said first lateral port in said subsea tree, said tubing hanger supporting the tubing;

    at least one vertical bore in said tubing hanger being sealed above said second lateral port by a sealing member, and said internal surface of said central bore through said subsea tree being sealed above said tubing hanger by an internal tree cap, said sealing member and internal tree cap being retrievable through the BOP bore;

    a workover port extending through said wall of said subsea tree for selective fluid circulation with that portion of said common passageway below the BOP bore and above said tubing hanger; and

    an annulus port extending through said wall of said subsea tree for selective fluid circulation with an annulus around the tubing, said workover and annulus ports being interconnected via a flow passageway having at least one valve.

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