| 摘要 |
PCT No. PCT/GB96/02256 Sec. 371 Date Aug. 11, 1998 Sec. 102(e) Date Sep. 11, 1998 PCT Filed Sep. 13, 1996 PCT Pub. No. WO97/11253 PCT Pub. Date Mar. 27, 1997A single bore riser system is disclosed which is based on a dual bore completion tree. An eccentric offset sub is coupled to the top of the tree and which can be sealed by BOP pipe rams. The completion tree has a main bore and an auxiliary bore with ball valves located in the respective bores. A remotely actuatable annulus plug is located in the bottom of the annulus bore and is moveable between a first position allowing fluid flow through the annulus bore and a second position sealing the annulus bore to provide control of various operations. Embodiments of the invention are described.
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