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(11) | EP 1 350 918 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | A method of completing a subsea well |
| (57) The method of the invention includes slimbore marine riser (124) and slimbore blow
out preventer (BOP) stack (120) operations for landing the reduced diameter tubing
hanger (TH12) in a tubing spool (TS10) using a landing string (LS). Conventional sized
BOP stacks and marine risers may also be used for the various operations. The slimbore
BOP stack and completion landing string is set aside of the tubing spool, and an xmas
tree (150) is connected to the top of the tubing spool. The xmas tree may be deployed
to the tubing spool independently of the riser(s) connected to and/or deployed inside
of the BOP stack. A BOP adapter (152) is provided to connect the top of the conventional
sized xmas tree to the bottom of the slimbore or conventional sized BOP stack and
marine riser. The landing string, with tubing hanger running tool at its bottom end,
is used along with other equipment to provide a high pressure conduit to the surface
for production fluids, and to serve as a mandrel around which BOP rams (128) and/or
annular BOPS may be closed to create a fluid path for the borehole annulus which is
accessed and controlled by the BOP choke and kill conduits. After the BOP stack is
removed by disconnecting the BOP deep water applications, where the xmas tree can
be installed without first having to retrieve and subsequently re-run the BOP stack.
Another important object of the invention is to provide a method which allows future
intervention using a BOP stack/marine riser or a more conventional workover/intervention
riser. |