| 摘要 |
A bore selection apparatus (38) is described for facilitating access from a single bore riser to a production bore (34, 34a) or annulus bore (36, 36a) without using a wireline-run whipstock. The bore selector apparatus disposed within the bore of a BOP stack (12) and which can be coupled between casing or tubing and a sub-s ea test tree. The bore selector apparatus (38) can be actuated from the surface or from an ROV to provide a coupling between the tubing bore (44) and the production bore (34, 34a) or between the tubing bore (44) and the smaller annulus bore (36, 36a). In a preferred embodiment this is achieved by using a rotatable ball valve element (46) located in a housing (42) disposed between the casing/tubing and a sub-sea test tree (39), the ball valve element (46) being apertured and being rotatable betwee n a first position whereby the aperture (48) connects the production tubing to the production tubing bore (34, 34a) and in a second position is rotated whereby the apertu re (48) connects the annulus bore (36, 36a) to the tubing or casing bore. When one o f the production or annulus bores is connected to the tubing bore, then the other bore is isolated or disconnected. Alternative embodiments of the invention are described.
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