Abstract: A system and method for hydraulically powering a seafloor pump and thereby delivering produced fluid from a subsea well are provided. The system includes a power fluid source, such as a seawater source, which is located at a seasurface location of a sea, and a hydraulically-driven pump, which is located at a seafloor location. The pump is configured to receive a flow of produced fluid from a subsea well and deliver the produced fluid through a riser to a receiver at a seasurface location. One or more conduits that define a feed passage connect the source and the pump, and the source is configured to receive power fluid and provide a flow of the power fluid via the feed passage of the conduit to the pump. The pump is hydraulically operated by the flow of power fluid and delivers the produced fluid from the pump to the receiver.

Abstract: The invention relates to a method and apparatus suitable for example in enabling the installation of a casing hanger within a bore in an oil-drilling wellhead in a manner so that the installation and the sealing-in of the casing hanger is accomplished in a single operation. The invention thus comprises installing a component (2) within a bore (4) so as to be received therewithin in a fluid-type manner utilizing expandible seals (8) and a shoulder (36) within the bore (4) adapted to be contacted by a leading edge (32) of one of two concentrically arranged sleeve members (12, 14) which are driven downwardly within the bore towards the shoulder, the two sleeve members which encircle the component (2) being secured together by shearable links (25).

Abstract: The invention provides an emergency suspension system for use particularly with drill casings in a wellhead. The system, which is intended to surround the casing, comprises an annular bowl member (6) having an internal tapered annular space (16) which reduces in diameter from its upper to its lower end and a support means comprising an annular support element arrangement (28) at least partially formed from resilient material and a plurality of support members (20,22,24) at least partially embedded in said resilient material and having a circular cross-section in at least one direction, said members forming a plurality of annular arrays adapted to surround said tubular member, the uppermost of said arrays (20) comprising support members having said circular cross-section larger than that of a lowermost (24) of said arrays.

Abstract: The invention relates to a method and apparatus suitable for angularly adjusting an attachment member to be sealed to a bore, for example a wellhead body (2) in the bore of a conductor (4). The attachment body (2) is to be sealed through the intermediary of a housing (6) and a metal-to-metal wedge seal. A support ring (14) encircling the external peripheral surface of the housing (6) is movable between two axially spaced positions on the peripheral surface, and movable pins are provided to maintain the support ring (14) in a first, out-of-the-way position until the housing (6) is positioned in the bore (4) mouth, the pins (9) being releasable to permit axial movement of the annular support member ring (14) from the first position towards a second position in which the member body (2) is in direct contact with the bore mouth.