초록 ▼

A slimbore marine riser and BOP are provided for a subsea completion system which includes a tubing spool secured to a wellhead at the sea floor. The tubing spool has an internal landing profile for a reduced diameter tubing hanger which is arranged and dimensioned to pass through the bore of the ri

A slimbore marine riser and BOP are provided for a subsea completion system which includes a tubing spool secured to a wellhead at the sea floor. The tubing spool has an internal landing profile for a reduced diameter tubing hanger which is arranged and dimensioned to pass through the bore of the riser and BOP at the end of a landing string. The tubing hanger, arranged and designed to be sealingly positioned in the tubing spool landing profile, has a production bore and a relatively large multiplicity of electric and hydraulic passages which terminate at a top end of the hanger with vertically extending electric and hydraulic couplers. A passage is provided through the body of the tubing spool which provides communication from above the tubing hanger to the well annulus below the hanger. A remotely controllable valve is placed in the annulus bypass passage. After the hanger is positioned in the tubing spool, the BOP may be set aside the wellhead, so that a substantially conventional xmas tree (with a BOP adaptor connected to its top profile) may be secured at its bottom end to the tubing spool. Subsequently the BOP may be secured to the top of the xmas tree by means of the BOP adaptor. After downhole and subsea completion operations are finished, the BOP and marine riser may be disconnected from the xmas tree by unlocking the bottom of the BOP adaptor from the top of the xmas tree. A tree cap can then be installed in the top profile of the xmas tree. For well intervention operations, a conventional BOP or LMRP of convenience can be reestablished to the top of the xmas tree via the BOP adaptor.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of completing a subsea well comprising the steps of,running a BOP stack by means of a marine riser from a surface vessel for connection of a bottom end of said BOP stack to the top of a wellhead at a seabed,disconnecting said BOP stack and marine riser from sai

[ What is claimed is:] [1.]1. A method of completing a subsea well comprising the steps of,running a BOP stack by means of a marine riser from a surface vessel for connection of a bottom end of said BOP stack to the top of a wellhead at a seabed,disconnecting said BOP stack and marine riser from said wellhead,removing said BOP stack and marine riser a sufficient lateral distance above said seabed, but substantially short of retrieving said BOP stack and marine riser back to the surface, to facilitate installation of a xmas tree onto said wellhead,connecting a bottom end of said xmas tree to said top of said wellhead,moving said BOP stack by means of said marine riser to a top end of said xmas tree for connection thereto, andconnecting a bottom end of said BOP stack to said top end of said xmas tree.