Statoil Petroleum As

Equinor Energy As

Statoil Asa

Bernt Henning Rusten

Arne Olav Fredheim

Knut Arild Maråk

Baard Kaasa

Lars Henrik Gjertsen

Cecilie Gotaas Johnsen

Gunleiv Skofteland

Ame Olav Fredheim

Trond Austrheim

Knut Arild Marak

A method and system for dehydration of a gas phase and hydrate inhibition of a liquid hydrocarbon phase in a multiphase hydrocarbon fluid stream containing water. The method may include (i) separating the hydrocarbon fluid stream into a liquid phase and a first gas phase, (ii) adding hydrate inhibitor to the first gas phase, and (iii) separating off condensed liquids and a second gas phase. The first gas phase has a water dew point that is lower than the initial multiphase hydrocarbon fluid stream and the second gas phase has a lower water dew point than the first gas phase. The hydrate inhibitor has a water content that is low enough to enable it to dry the first gas phase, the hydrate inhibitor being separated off with the condensed liquids and mixed with a part or all of the liquid phase from the separation to inhibit the liquid phase.

Combined dehydration of gas and inhibition of liquid from a well stream

The present invention concerns a method for lowering the water dew point subsea in a produced multiphase hydrocarbon fluid stream containing water, the method comprising the steps of: separating () the hydrocarbon fluid stream () into a liquid phase () and a first gas phase (); cooling () the first gas phase in a controlled mariner to knock out water or condensing water and optionally other condensates while keeping the fluid above a hydrate formation temperature thereof; separating off condensed liquids () and a second gas phase; wherein the second gas phase () has a water dew point which is lower than that of the initial multiphase hydrocarbon fluid stream. The invention also concerns a system for lowering the water dew point subsea.

Method and system for lowering the water dew point of a hydrocarbon fluid stream subsea

A subsea heat exchanger for cooling or heating a hydrocarbon-containing fluid includes a convection section enclosed by a shell or enclosure comprising, one or more heat exchanging fluid inlet(s) and outlet(s), one or more hydrocarbon-containing fluid inlet(s) and outlet(s), and one or more fluid carrying convection tube(s) adapted for heat transfer between the hydrocarbon-containing fluid on the inside of the tube(s) and a surrounding heat exchanging fluid on the opposite side of the tube(s). The heat exchanger also includes one or more flow regulating device(s) for controlling the hydrocarbon-containing fluid outlet temperature. The heat exchanging fluid circulates in a closed circuit for heat transfer both with said hydrocarbon-containing fluid and with surrounding sea water on the outside of the enclosure.

Subsea heat exchanger and method for temperature control

The present invention concerns a method for lowering the water dew point subsea in a produced multiphase hydrocarbon fluid stream containing water, the method comprising the steps of: separating () the hydrocarbon fluid stream () into a liquid phase () and a first gas phase (); cooling () the first gas phase in a controlled manner to knock out water or condensing water and optionally other condensates while keeping the fluid above a hydrate formation temperature thereof; separating off condensed liquids () and a second gas phase; wherein the second gas phase () has a water dew point which is lower than that of the initial multiphase hydrocarbon fluid stream. The invention also concerns a system for lowering the water dew point subsea.

The invention relates to a multi-phase distribution system, a sub sea heat exchanger provided with such a multi-phase distribution system, the use of such a multi-phase distribution system and a method of temperature control for hydrocarbons. The invention provides an improved control over multi-phase mixtures comprising hydrocarbons and improvements in the controlling of heat exchanging processes.

Multi-phase distribution system, sub sea heat exchanger and a method of temperature control for hydrocarbons

Separation device or unit for separating liquid from an inlet flow which mainly contains gas, has a container or a pipe section with an outlet for gas from the container or the pipe section, an outlet for liquid from the container or pipe section and an inlet for the inlet flow to the container or pipe section. The device has a flow manifold arranged to receive and direct the inlet flow towards a porous pipe body extending towards the gas outlet and arranged to receive all or most of the inlet flow. Part of the flow is flowing through the tubular body to the gas outlet, while the remaining flow is flowing through the tubular body's porous wall, and an annular space including the volume between the tubular body and the container wall or pipe section is open for gas flow towards the gas outlet.

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Jakobsli, Norway

Bernt Henning Rusten