| 摘要 |
PCT No. PCT/GB96/01509 Sec. 371 Date Apr. 17, 1998 Sec. 102(e) Date Apr. 17, 1998 PCT Filed Jun. 21, 1996 PCT Pub. No. WO97/04211 PCT Pub. Date Feb. 6, 1997A lightweight intervention system is described for use with single bore and dual bore intervention operations and which can be used with both horizontal trees and conventional trees and with wellheads without trees mounted thereon. The system is based on a two-part intervention apparatus; the lower part provides the pressure control and consists of an xmas tree or wellhead connector and structural housing in which a sub-sea test tree is located and is coupled to the xmas tree and an upper part, a disconnectable section, attaches to the lower part and consists of a sub-sea test tree latch housed within an xmas tree connector and additional pressure control equipment as required. This general structure can be configured in various ways to create different embodiments for use with horizontal trees and conventional trees which have a single through-bore requirement and a dual bore requirement respectively. With horizontal trees access to the annulus space depends on the type of proprietary valve system used in the tree. The intervention apparatus may also be used directly on wellheads where the tree has been removed. |
