Abstract: Subsea Xmas tree assembly (5, 505) having a Xmas tree main bore (7) and a Xmas tree annulus bore (9). The main bore (7) aligns with a tubing hanger main bore (16) and the Xmas tree annulus bore (9) communicates with a tubing hanger annulus bore (17), when the Xmas tree assembly (5, 505) is installed above a tubing hanger (3) of a subsea well. The subsea Xmas tree assembly (5, 505) comprises a plug tool (100) adapted to install and to retrieve a plug (200) into and out of the tubing hanger annulus bore (17) when the Xmas tree assembly (5, 505) is installed above the tubing hanger (3). The assembly has a tool accommodation compartment (118, 618) within which the plug tool (100) is arranged. An associated method is also described.

Abstract: A weak link (17, 43) for a riser system comprising a pin (2, 25) and a box (1, 24), bolts (11, 34) for releasably connecting the pin (2, 25) and the box (1, 24), the bolts being designed to break at a predefined tension. The link further comprising a pressure balancing mechanism for balancing axial forces acting on the bolts (11, 34) due to end cap effect. The weak link also comprises a strong mode mechanism and a dampening mechanism.

Abstract: A device for the application of a preload between a subsea wellhead and a conductor housing includes an activating member, a support housing, a locking member, and at least one element for securing the support housing relative to the wellhead. Movement of the activating member causes an inclined lateral movement of the locking member. The activating member carries a ratchet having a multiplicity of serrations which have a regular pitch in the activating direction and the support housing carries at least two latches which allow the relative movement and can engage the ratchet to inhibit movement reverse to the activating direction. The discrete locking positions provided by one of the latches are positionally out of phase with the discrete locking positions provided by the other latch or latches. A support member is positioned to be moved laterally in response to movement of the activating member and to support the locking member against the engagement zone of the datum member.

Abstract: Subsea valve for control of fluid that can be contaminating and at elevated pressure and temperature, such as well or process fluids, the valve comprising an actuator unit and a valve part, the actuator unit can be operated in order to control the valve part, distinctive in that the actuator unit is magnetically coupled to the valve part and the coupling is through a barrier wall isolating the actuator unit from the valve part, and the actuator unit and a driving part of the magnetic coupling are arranged in a sealed actuator housing into which leakage of said contaminating fluid thereby has been eliminated.

Abstract: A tool for lowering, alternatively later retrieval, of a pipeline end which is provided with a connecting part designed for mating with and connection to a first connecting part on the seabed is shown. The tool is so arranged that the tool can be brought to the surface again for reuse. The tool comprises a central lifting frame, a guiding part forming an extension of the lifting frame and a lifting yoke, which tool includes gripping mechanisms which, in one situation, are actuatable to partly circumscribe and retain the pipeline end, and, in a second situation, the gripping mechanisms are releasable to release the pipeline end from the lifting frame.

Abstract: Subsea well template comprising a plurality of well slots arranged adjacent to a manifold reception space, said template comprising a plurality of template hatches for protection of well components, including a Xmas tree. Said hatches comprise at least a top protection cover and a side protection panel. The hatches are arranged to pivot between a closed and open position, about a pivot axis arranged at a lower end of the hatch. When in an open position, the well template exhibits absence of a framework extending up towards the top of the template.

Abstract: The invention provides a subsea pump, distinctive in that it comprises a pressure housing divided into two compartments; a compartment with pump or impellers arranged on a shaft and a compartment with motor or a stator; a diaphragm arranged sealingly between the compartments, a magnetic coupling between the compartments, through the diaphragm; and a pressure compensation system for balancing the pressure on the diaphragm of the motor or stator compartment side to the pressure on the diaphragm of the pump or impeller compartment side.

Abstract: The invention provides a bore protector for a tubing hanger, the bore protector is to be arranged in a tubing hanger in a spool in a subsea production Xmas tree for through tubing rotary drilling (TTRD) in an existing production well. The bore protector is distinctive in that it comprises a means to be releasably fastened in at least one of: the spool in the Xmas tree and the tubing hanger, and a wear sleeve extending down into the tubing hanger, covering the tubing hanger sealing surfaces for the tubing hanger plugs, the wear sleeve comprises a shoulder at or near an upper end, the shoulder is arranged on a below positioned seat of a main part of the bore protector, in which position the wear sleeve is releasably fastened.

Abstract: A power cable, or power umbilical, comprising a number of electric cables for transfer of large amounts of electric power/energy; filler material in the form of stiff elongate polymer elements; said number of electric cables and stiff elongate polymer elements being gathered in a twisted bundle by means of a laying operation; a protective sheath that encompasses the electric cables and the filler material; wherein the filler material is manufactured of a polymer material, which polymer material has been added constituents that transforms the filler material to be substantially more heat conducting and heat dissipating.

Abstract: The invention provides a valve useful as a production valve in or connected to a production tree subsea, and other similar uses subsea or topside, the valve comprises a valve element, a valve element pressure housing, an actuator, a stem and a bonnet, the actuator is via the stem operatively arranged to close or open a fluid passageway through the valve element, the bonnet enclose the stem and is connected to the valve element pressure housing and seals are arranged between the stem and the bonnet for sealing against the pressure of the valve element pressure housing. The valve is distinctive in that the valve comprises at least one seal for sealing between stem and bonnet, the seal having identical inner sealing diameter against the stem and outer sealing against a single body or element of the bonnet.

Abstract: Pressure volume regulator (20) for control of supply and pressure of barrier fluid for pumps and compressors subsea, comprising an inlet (18) for barrier fluid at an inlet pressure, a first outlet (19) and a second outlet (15), the inlet pressure is higher than the first outlet pressure that is higher than the second outlet pressure. The pressure volume regulator is distinctive in that the inlet and the second outlet are interlocked between a movable longitudinal interlock member (5) with valve elements operatively arranged at either end, the length of the interlock member plus said valve elements is shorter than the distance between an open-close valve mechanism of the inlet and an open-close valve mechanism of the second outlet.

Abstract: The invention provides a system for multiphase pumping, preferably for subsea application, distinctive in that it comprises a multiphase pressure boosting pump and a separator, preferably adapted for subsea operation, a multiphase fluid inlet connected to the pump, a multiphase outlet from the separator, an outlet of the pump arranged to an inlet of the separator, a liquid outlet of the separator arranged to a liquid inlet on the pump, and a power recovery turbine arranged between said liquid outlet of the separator and said liquid inlet on the pump.

Abstract: Subsea heat exchanger (1) cooling a hydrocarbon-containing fluid by flowing seawater through it. Cooling pipes (4) are arranged in a convection section (11). The heat exchanger has an inlet (5a) and an outlet (5b) for the hydrocarbon-containing fluid, and an inlet (21) and outlet (22) for seawater. The seawater inlet (21) is connected to the cooling pipes (4). The inlet (5a) and the outlet (5b) of the hydrocarbon-containing fluid are connected to the convection section (11). The seawater can flow through the cooling pipes (4) and the hydrocarbon-containing fluid can flow in the convection section (11) in contact with the outer walls of the cooling pipes (4). The heat exchanger comprises also a cap (6) at at least one end of the cooling pipes (4), wherein the cap (6) comprises one or more receiving arrangements (8) for anodes (7) and/or one or more anodes (7).

Abstract: A “boltless” locking arrangement for secure attachment of a boss to a fixed structural part is shown. The boss has a central axis and is extending substantially perpendicular to the plane of the structural part when the parts are assembled. The arrangement includes two substantially radially extending, when viewed relative to the central axis, action surfaces provided in the external surface of the boss, and at least one annular plate configured body made up by individual segments. The at least one annular plate configured body is at its radially inner, but external portion designed to co-operate, or engage with, at least one of the respective two action surfaces, and at its radially outer, but internal portion and on opposite side, is abutting the fixed structural part.

Abstract: A weak link (17, 43) for a riser system comprising a pin (2, 25) and a box (1, 24), bolts (11, 34) for releasably connecting the pin (2, 25) and the box (1, 24), the bolts being designed to break at a predefined tension. The link further comprising a pressure balancing mechanism for balancing axial forces acting on the bolts (11, 34) due to end cap effect. The weak link also comprises a strong mode mechanism and a dampening mechanism.

Abstract: A subsea leak detection system for an off-shore operation facility, comprising at least a leak detector (6) operatively connected to a controller (9) located on a subsea assembly (14). The system is provided with a floating member (1) on which the leak detector (6) is suitably attached. The floating member (1) is adapted to be installed and stably positioned, above the assembly (14).

Abstract: Seal assembly (201) for a subsea well assembly with inner and outer circular sealing surfaces (215a, 215b) in an annulus (211). It has a seal ring (203) with a cross section exhibiting two legs (205a, 205b), with seal ring seal surfaces (209a, 209b). The seal ring comprises a main metal section (217) having metal with the same or higher degree of hardness than the metal in said facing circular sealing surfaces (215a, 215b). The seal ring seal surfaces comprise a seal ring surface metal (210a, 210b) which is of a softer metal than the metal in the circular sealing surfaces (215a, 215b) and the metal in the main metal section (217). The seal ring (203) comprises a second section (219) comprising said seal ring surface metal (210a, 210b), the second section (219) extending continuously between said seal ring seal surfaces (209a, 209b) on the respective legs.

Abstract: A tubing hanger (1) landing in a tubular element (101), having a coupling assembly (11) for hydraulic coupling between the tubing hanger (1) and the element. A coupling element (17) moves radially between an outer coupled position and an inner non-coupled position. An actuation element (25) with a contact surface (25f) exerts an outward actuation force onto an inner actuation surface (17a) of the coupling element. The actuation element comprises two actuation sections (25x, 25y) exposed to a outward force from an actuation arrangement (27). The contact surface (25f) has a distance the actuation sections. The actuation element moves in the radial outward direction so that the movement of at least one of the two actuation sections (25x, 25y) stops after the radial movement of the contact surface (25f) stops. The contact surface (25f) movement halts as the coupling element (17) reaches the coupled position.

Abstract: A device for the application of a preload between a subsea wellhead and a conductor housing comprises an activating member (1), a support housing (2), a locking member (3), end means (9) for securing the support housing relative to the well-head. Movement of the activating member causes an inclined lateral movement of the locking member. The activating member carries a ratchet (7) comprising a multiplicity of serrations which have a regular pitch in the activating direction and the support housing (1, 2) cames at least two latches (19, 20) which allow the relative movement and can engage the ratchet to inhibit movement reverse to the activating direction. The discrete locking positions provided by one of the latches are positionally out of phase with the discrete locking positions provided by the other latch or latches.

Abstract: Subsea Xmas tree assembly (5, 505) having a Xmas tree main bore (7) and a Xmas tree annulus bore (9). The main bore (7) aligns with a tubing hanger main bore (16) and the Xmas tree annulus bore (9) communicates with a tubing hanger annulus bore (17), when the Xmas tree assembly (5, 505) is installed above a tubing hanger (3) of a subsea well. The subsea Xmas tree assembly (5, 505) comprises a plug tool (100) adapted to install and to retrieve a plug (200) into and out of the tubing hanger annulus bore (17) when the Xmas tree assembly (5, 505) is installed above the tubing hanger (3). The assembly has a tool accommodation compartment (118, 618) within which the plug tool (100) is arranged. An associated method is also described.