Abstract: A system and methods for barrier testing of a X-mas tree production system. The X-mas tree comprises a fluid line between a set of two barrier valves, one of the barrier valves of the set of two barrier valves being an upstream barrier valve closer to a reservoir and the other barrier valve being a downstream barrier valve closer to an environment. The system provides fluid at different test pressures to the fluid line between the downstream barrier valve and the upstream barrier valve. The system comprises a first fluid connection line from a fluid source to a pressure increasing unit; a second fluid connection line from the pressure increasing unit to a first connection point on the fluid; and a third fluid connection line from a fluid receiving unit to a second connection point on the second fluid connection line.

Abstract: A fiber optic sensing (FOS) system and method. The system may include one or more interrogator units and a proximal wavelength division multiplexer (WDM) and a distal WDM optically connectable to the one or more interrogator units, an upgoing transmission fiber, a down-going transmission fiber, and one or more downhole sensing fibers. The method may include transmitting one or more light pulses from an interrogator unit, multiplexing the one or more light pulses from the interrogator unit with a proximal WDM into an upgoing transmission fiber and a down-going transmission fiber, and receiving the one or more light pulses with a distal WDM. The method may further include multiplexing the one or more light pulses from the upgoing transmission fiber and the down-going transmission fiber into one or more downhole sensing fibers and receiving backscatter light from at least one of the one or more downhole sensing fibers.

Abstract: A fiber optic sensing (FOS) system and method. The system may include one or more interrogator units and a proximal wavelength division multiplexer (WDM) and a distal WDM optically connectable to the one or more interrogator units, an upgoing transmission fiber, a down-going transmission fiber, and one or more downhole sensing fibers. The method may include transmitting one or more light pulses from an interrogator unit, multiplexing the one or more light pulses from the interrogator unit with a proximal WDM into an upgoing transmission fiber and a down-going transmission fiber, and receiving the one or more light pulses with a distal WDM. The method may further include multiplexing the one or more light pulses from the upgoing transmission fiber and the down-going transmission fiber into one or more downhole sensing fibers and receiving backscatter light from at least one of the one or more downhole sensing fibers.

Abstract: A fiber optic sensing (FOS) system and method. The system may include one or more interrogator units and a proximal wavelength division multiplexer (WDM) and a distal WDM optically connectable to the one or more interrogator units, an upgoing transmission fiber, a down-going transmission fiber, and one or more downhole sensing fibers. The method may include transmitting one or more light pulses from an interrogator unit, multiplexing the one or more light pulses from the interrogator unit with a proximal WDM into an upgoing transmission fiber and a down-going transmission fiber, and receiving the one or more light pulses with a distal WDM. The method may further include multiplexing the one or more light pulses from the upgoing transmission fiber and the down-going transmission fiber into one or more downhole sensing fibers and receiving backscatter light from at least one of the one or more downhole sensing fibers.

Abstract: A method of operating a subsea production system (1), the system comprising a subsea tree (2) connected to a subsea well (3), a production tubing (4) in the well (3), and an electrically operable electric downhole safety valve (5), wherein the method comprises, in case of malfunction in operation of the electric downhole safety valve (5), the steps of installing a hydraulically operable insert hydraulic downhole safety valve (6) within the production tubing (4); connecting the insert hydraulic downhole safety valve (6) to the fluid line (10) at a point of setting (7) in the subsea well (3); operating the insert hydraulic downhole safety valve (6) by using the fluid line (10) which extends from an input port (11) at a position outside of the subsea tree (2).

Abstract: A subsea hydrocarbon flowline system (300) is disclosed. The flowline system has a hydrocarbon flowline (302); an electric trace heating system (304) arranged along at least a part-length of the flowline to control the temperature of hydrocarbon fluid flowing in the flowline; and a power input connector (Pin) configured for receiving electrical power from an electrical power providing system for powering the electric trace heating system. The electric trace heating system has a first three-phase trace heating cable (C?) and a second three-phase trace heating cable (C?), each trace heating cable extending between the power input connector and a cable termination (T?; T?) where phase conduits (L1?, L2?, L3?; L1?, L2?, L3?) of the trace heating cable are Y-connected and terminate in a neutral connection point (LN?; LN?).

Abstract: A method and system for fiber optic communication and sensing (FOCS) may include transmitting one or more measurement signals from an interrogator unit that is optically connected to a proximal wavelength division multiplexer (WDM), transmitting one or more communication signals from an information handling system that is optically connected to a proximal wavelength division multiplexer (WDM), multiplexing the one or more measurement signals and the one or more communication signals with the proximal WDM into a first fiber optic cable, and receiving the one or more measurement signals and the one or more communication signals with a distal WDM that is optically connected to the first fiber optic cable. The method may further include multiplexing the one or more measurement signals from the first fiber optic cable into one or more downhole sensing fibers and receiving backscatter light from at least one of the one or more downhole sensing fibers.

Abstract: A subsea hydrocarbon flowline system (300) is disclosed. The flowline system has a hydrocarbon flowline (302); an electric trace heating system (304) arranged along at least a part-length of the flowline to control the temperature of hydrocarbon fluid flowing in the flowline; and a power input connector (Pin) configured for receiving electrical power from an electrical power providing system for powering the electric trace heating system. The electric trace heating system has a first three-phase trace heating cable (C?) and a second three-phase trace heating cable (C?), each trace heating cable extending between the power input connector and a cable termination (T?; T?) where phase conduits (L1?, L2?, L3?; L1?, L2?, L3?) of the trace heating cable are Y-connected and terminate in a neutral connection point (LN?; LN?).

Abstract: A fiber optic sensing (FOS) system and method. The system may include one or more interrogator units and a proximal wavelength division multiplexer (WDM) and a distal WDM optically connectable to the one or more interrogator units, an upgoing transmission fiber, a down-going transmission fiber, and one or more downhole sensing fibers. The method may include transmitting one or more light pulses from an interrogator unit, multiplexing the one or more light pulses from the interrogator unit with a proximal WDM into an upgoing transmission fiber and a down-going transmission fiber, and receiving the one or more light pulses with a distal WDM. The method may further include multiplexing the one or more light pulses from the upgoing transmission fiber and the down-going transmission fiber into one or more downhole sensing fibers and receiving backscatter light from at least one of the one or more downhole sensing fibers.

Abstract: A method of operating a subsea production system (1), the system comprising a subsea tree (2) connected to a subsea well (3), a production tubing (4) in the well (3), and an electrically operable electric downhole safety valve (5), wherein the method comprises, in case of malfunction in operation of the electric downhole safety valve (5), the steps of installing a hydraulically operable insert hydraulic downhole safety valve (6) within the production tubing (4); connecting the insert hydraulic downhole safety valve (6) to the fluid line (10) at a point of setting (7) in the subsea well (3); operating the insert hydraulic downhole safety valve (6) by using the fluid line (10) which extends from an input port (11) at a position outside of the subsea tree (2).

Abstract: The present invention relates to a horizontal Christmas tree comprising a central bore (72) and a horizontal outlet (70) extending laterally from the central bore. A tubing hanger (74) is locked into the central bore and connected to a production tubing (76) extending into the well. The tubing hanger comprises a first passage (78) axially aligned with the production tubing and a second passage (80) extending laterally from the first passage and aligned with the outlet. The first passage comprises means for releasable fastening of at least one plugging device (1a, 1b) for plugging the first passage above the second passage.

Abstract: The present invention relates to a horizontal Christmas tree comprising a central bore (72) and a horizontal outlet (70) extending laterally from the central bore. A tubing hanger (74) is locked into the central bore and connected to a production tubing (76) extending into the well. The tubing hanger comprises a first passage (78) axially aligned with the production tubing and a second passage (80) extending laterally from the first passage and aligned with the outlet. The first passage comprises means for releasable fastening of at least one plugging device (1a, 1b) for plugging the first passage above the second passage.

Abstract: An accelerometer comprises a housing including a mass-supporting frame and a mass supported on the frame by a pair of outer spring member aligned along a first axis. The mass may comprise an outer mass connected to the pair of outer spring members and an inner mass connected to the outer mass by a number of inner spring members, the inner spring members aligned along one or more axes, which form a plane which the axis of the outer spring members also may be aligned. Also provided is means for detecting rotation of the mass and translation of the inner mass.

Abstract: An accelerometer comprises a housing including a mass-supporting frame and a mass supported on the frame by a pair of outer spring member aligned along a first axis. The mass may comprise an outer mass connected to the pair of outer spring members and an inner mass connected to the outer mass by a number of inner spring members, the inner spring members aligned along one or more axes, which form a plane which the axis of the outer spring members also may be aligned. Also provided is means for detecting rotation of the mass and translation of the inner mass.