Orifice selection device for use in coupling a single orifice riser to a subsea two-hole pipe holder and to a pipe holder placement tool

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-sea 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 between 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 aperture (48) connects the annulus bore (36, 36a) to the tubing or casing bore. When one of 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.