| 摘要 |
PCT No. PCT/GB96/02322 Sec. 371 Date Jul. 30, 1998 Sec. 102(e) Date Jul. 30, 1998 PCT Filed Sep. 20, 1996 PCT Pub. No. WO97/11252 PCT Pub. Date Mar. 27, 1997An improved sub-sea Xmas tree consists of a wellhead connector, a cylindrical structural housing and a tree cap mounted on top of the housing. A dual bore sub-sea completion test tree is disposed in the housing and it has a main production bore with serial ball valves for controlling fluid flow in the production flow path of an annuus bore with a ball valve therein. The ball valves are independently and remotely actuatable by a remotely operated vehicle (ROV) override system to control communication through the Xmas tree and to comply with various regulatory standards. A cross-over valve is provided between the main bore and the annulus bore to allow fluid passage for well kill operations.
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