Abstract: A method of processing a multiphase well effluent mixture comprises: transferring the multiphase well effluent mixture (G+L) via a multiphase well effluent flowline (3, 23) to a gas liquid separator (5, 24) in which the multiphase well effluent mixture is separated into substantially gaseous and liquid fractions; transferring the substantially liquid fraction L into a liquid flowline (7, 25) in which a liquid pump (8, 29) is arranged; transferring the substantially gaseous fraction into a gas flowline (6, 26) in which a gas compressor (10, 30) is arranged; protecting the gas compressor (10, 30) against pressure and/or liquid surges by recirculating a recycled gas stream (Ghot) via a gas recycling conduit (14, 44) through the gas compressor in response to detection of a pressure and/or liquid surge in the multiphase well effluent mixture; cooling the recycled gas stream by injecting cooled recycled liquid (Lcold) from the liquid flowline (7, 25) into the recycled gas stream (Ghot) which recycled liquid is cool

Abstract: A fluid separating vessel (1) comprises: a liquid outlet (3) near the bottom of the vessel; a gaseous fluid outlet (4) near the top of the vessel; a plurality of cyclones (5) arranged in an upper region of the vessel in which at least some liquid droplets that may be entrained in the substantially gaseous fluid stream flowing in upward direction from a fluid inlet (2) towards the gaseous fluid outlet (4) are coalesced, separated from the gaseous carrier fluid and induced to drip down towards the liquid outlet (3) via a liquid return conduit (7); and a plurality of rotating liquid coalescing centrifuges (8) that are arranged below the cyclones (5), in which liquid coalescing centrifuges (8) fluid fed to the cyclones (5) is pre-treated such that at least some liquid droplets that may be entrained in the substantially gaseous fluid stream flowing in upward direction from the fluid inlet towards the cyclones are coalesced.

Abstract: A method of processing a multiphase well effluent mixture comprises: transferring the multiphase well effluent mixture (G+L) via a multiphase well effluent flowline (3, 23) to a gas liquid separator (5, 24) in which the multiphase well effluent mixture is separated into substantially gaseous and liquid fractions; transferring the substantially liquid fraction L into a liquid flowline (7, 25) in which a liquid pump (8, 29) is arranged; transferring the substantially gaseous fraction into a gas flowline (6, 26) in which a gas compressor (10, 30) is arranged; protecting the gas compressor (10, 30) against pressure and/or liquid surges by recirculating a recycled gas stream (Ghot) via a gas recycling conduit (14, 44) through the gas compressor in response to detection of a pressure and/or liquid surge in the multiphase well effluent mixture; cooling the recycled gas stream by injecting cooled recycled liquid (Lcold) from the liquid flowline (7, 25) into the recycled gas stream (Ghot) which recycled liquid is cool

Abstract: A fluid separating vessel (1) comprises: a liquid outlet (3) near the bottom of the vessel; a gaseous fluid outlet (4) near the top of the vessel; a plurality of cyclones (5) arranged in an upper region of the vessel in which at least some liquid droplets that may be entrained in the substantially gaseous fluid stream flowing in upward direction from a fluid inlet (2) towards the gaseous fluid outlet (4) are coalesced, separated from the gaseous carrier fluid and induced to drip down towards the liquid outlet (3) via a liquid return conduit(7); and a plurality of rotating liquid coalescing centrifuges (8) that are arranged below the cyclones (5), in which liquid coalescing centrifuges (8) fluid fed to the cyclones (5) is pre-treated such that at least some liquid droplets that may be entrained in the substantially gaseous fluid stream flowing in upward direction from the fluid inlet towards the cyclones are coalesced.

Abstract: A method of cooling a multiphase well effluent stream comprises: separating the multiphase well effluent stream (G+L) into gas enriched and liquid enriched fractions in a gas liquid separator (2, 22); cooling the liquid enriched fraction in a heat exchanger (6,26); reinjecting the cooled liquid enriched fraction into the well effluent stream (G+L) at a location upstream of the gas liquid separator (2, 22), thereby cooling the well effluent stream without requiring a gas-liquid heat exchanger to directly cool the multiphase well effluent stream, which may be ten times larger than the liquid-liquid heat exchanger (6, 26) for cooling the recycled liquid enriched fraction (Lcold).

Abstract: A method of processing a multiphase well effluent mixture comprises: transferring the mixture (L+G) via a multiphase well effluent flowline (2) to a gas liquid separator (1) in which the multiphase well effluent mixture is separated into substantially gaseous and liquid fractions; transferring the substantially liquid fraction (L) into a liquid flowline (6) in which liquid pump (7) is arranged; transferring the substantially gaseous fraction (G) into a gas flowline (8) in which a gas compressor (9) is arranged; protecting the gas compressor (9) against liquid and/or pressure surges due to low gas flow rate and/or backflow of compressed gas by recirculating a recycled gas stream (Ghot) via a gas recycling conduit (10) through the gas compressor in response to detection of the onset of a liquid surge in the multiphase well effluent mixture and/or of a pressure surge due to low gas flow rate and/or a high pressure differential across the gas compressor (9); and cooling the recycled gas stream by contacting recyc

Abstract: A heat exchanger comprises heat exchanging tubes (3) with a profiled inner and/or outer surface, which profiled surface provides at least one cooling fin. The heat exchanging tubes (3) may each be made of a helically wound profiled strip (4) with intermeshing profiled edges (5, 6), which perform both as cooling fins and reinforcement ribs of the tube, such that the heat exchanging capacity is increased and the wall thickness of the tube may be decreased and the heat exchanger will be more efficient and lighter than conventional heat exchangers with cylindrical heat exchanging tubes.

Abstract: A lightweight underwater cooling assembly with a high cooling capacity comprises: an assembly of heat exchanger tubes (4) arranged in a submerged refrigerant boiling chamber (5); a thin walled water cooled condenser (6) in which refrigerant vaporized in the boiling chamber (5) is condensed and from which condensed refrigerant is recirculated into the boiling chamber (5); and a thin walled pressure compensating membrane (9) which maintains the fluid pressure (˜psea) within the boiling chamber (5) and condenser (6) substantially similar to the fluid pressure (psea) of the (sea) water surrounding the submerged refrigerant boiling chamber (5).