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US 2009/0255682 A1Published application
Large Bore Vertical Tree
AssigneeVetco Gray Inc.
InventorsRobert K. Voss, David S. Christie, Peter Breese
Life of this patent
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Abstract
A subsea wellhead assembly that includes a wellhead housing, a production tree, a tubing hanger adapted to land in the wellhead assembly inside the wellhead housing, and a bore formed through the production tree having an inner diameter greater than the tubing hanger outer diameter. A hanger adapter may be included having an annular body disposed on the tubing hanger upper surface and a flange member projecting radially outward from the annular body.
Claims15
A subsea wellhead assembly comprising:
- a wellhead housing;
- a production tree secured to the wellhead housing upper end,
- the production tree having a production port and an annulus port;
- a tubing hanger releasably landed in the wellhead housing, the tubing hanger having an attached tubing string and a production passage formed therein;
- a bore formed through the production tree having an inner diameter greater than the tubing hanger outer diameter, so that the tubing hanger can pass through the bore;
- and
- a hanger adapter disposed on the tubing hanger in the tree bore, the hanger adapter having an upper end below the tree production port and an axial bore registering with the tubing hanger production passage and in fluid communication with the tree production port.
4 more elements
A subsea wellhead assembly comprising:
- a wellhead housing;
- a production tree secured to the wellhead housing upper end,
- the production tree having a production port and an annulus port;
- a casing hanger having attached casing that projects into a wellbore;
- a tubing hanger releasably landed in the wellhead housing defining an annular space between the tubing hanger upper portion and the tree bore, the tubing hanger having an attached tubing string disposed within the casing to form a tubing annulus therebetween, and a production passage formed axially through the tubing hanger;
- an annulus passage through the wellhead housing and tubing hanger, so that a flow path is created between the tubing annulus and annulus port;
- a bore formed through the production tree having an inner diameter greater than the tubing hanger outer diameter, so that the tubing hanger can pass through the bore;
- and
- a hanger adapter disposed on the tubing hanger in the tree bore, the hanger adapter having an upper end below the tree production port and an axial bore registering with the tubing hanger production passage and in fluid communication with the tree production port.
6 more elements
A method of a subsea wellhead assembly comprising:
- securing a wellhead housing on the seafloor;
- providing a production tree having an axial bore on the wellhead housing;
- inserting a tubing hanger with attached production tubing through the production tree bore coupling the tubing hanger to the wellhead housing;
- and flowing wellbore fluids from the tubing, through the tubing hanger, into a space in the bore above the tubing hanger, and through a production outlet formed in the production tree radially projecting outward from the space.
1 more element
Dependencies are inferred from the claim text.