Abstract: A method and system for transmitting signals from a distributed acoustic sensor, DAS, into a well through at least one pin penetrator running from a downhole side to a top side of a subsea wellhead, and without degrading quality of the signals. The method includes: connecting a first assistant recording package, ARP, between the DAS and the at least one pin penetrator on a downhole side of the wellhead; connecting a second ARP between a data acquisition system and the at least one pin penetrator on the topside of the well head; converting DAS signals to electrical signals by the first ARP and performing signal conditioning; transmitting signals received from the DAS sensors, from the first ARP and through the wellhead to the second ARP. The system implements the method.

Abstract: A seismic sensor cable 10 for lowering into a subterranean well 15 for acquiring information about seismic, microseismic and mechanical vibration incidents in the subterranean well 15, where the device comprises a first portion 20 that is elongate and has a first length with a proximal end and a distal end that are to be lowered down into a lower part of the subterranean well 15, the first portion 20 having a plurality of electric or electromechanical multicomponent seismic sensors 25 that are connected and distributed over large parts of its first length, and wherein the seismic profiling device 10 further comprises a second portion 30 that is elongate and has a second length with a proximal end that is to be held above the subterranean well 15 and a distal end that is to be lowered down into the upper part of the subterranean well 15, said second portion 30 comprising an optical fiber 35 that runs along large parts of said second portion 30, and an electric cable 40 for conducting electric power from the pr

Abstract: A seismic sensor cable 10 for lowering into a subterranean well 15 for acquiring information about seismic, microseismic and mechanical vibration incidents in the subterranean well 15, where the device comprises a first portion 20 that is elongate and has a first length with a proximal end and a distal end that are to be lowered down into a lower part of the subterranean well 15, the first portion 20 having a plurality of electric or electromechanical multicomponent seismic sensors 25 that are connected and distributed over large parts of its first length, and wherein the seismic profiling device 10 further comprises a second portion 30 that is elongate and has a second length with a proximal end that is to be held above the subterranean well 15 and a distal end that is to be lowered down into the upper part of the subterranean well 15, said second portion 30 comprising an optical fibre 35 that runs along large parts of said second portion 30, and an electric cable 40 for conducting electric power from the pr

Abstract: A method for producing an oil reservoir, comprising establishing an oil producing well, producing a production fluid containing oil and water, transporting the production fluid to a downhole liquid/liquid hydrocyclone, separating the fluid in the liquid/liquid hydrocyclone into an oil enriched stream at the hydrocyclone underflow, transporting the oil enriched stream to the surface, reinjecting the water enriched stream at a downhole site, cooling the transported oil enriched stream by sending a counterflow of a cooling medium relative the oil enriched stream, thereby keeping the oil enriched stream in a substantially liquid phase.

Abstract: The invention relates to a system for separating oil/water/gas from a marginal field by using a combination of a coarse separator with short treatment duration which separates into three flows where one obtains an oil concentration of over 70%, a water concentration of over 70% and a gas quality for burning off, where the oil and water flows are treated in cyclone systems having defined geometric proportions and a gas portion is reinjected into the water injection flows without the use of a compressor. Gas/liquid cyclones may also be used before the choke valve so that the gas pressure is kept, or optionally reinjected or used for injector pump operation of low pressure wells.

Abstract: Hydrocarbons are recovered from a sub-surface reservoir whereby a production flow is subjected to a separation process in the well hole. Gas and liquid are separated from each other using a cyclone separator, and condensate/oil is separated from water at high pressure in a subsequent cyclone separation. Membranes are used to separate unwanted gases, includeing H.sub.2 S, CO.sub.2 and H.sub.2 O, using membranes under high pressure in the well hole.

Abstract: The invention describes the separation of oil and water in a production flow from a hydrocarbon reservoir, said separation being carried out by the use of one cyclone or a plurality of cyclones positioned downhole. The produced water is reinjected into the reservoir itself or into a formation zone lying above or below the reservoir.