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John Daniel Friedemann

Tom Grimseth

Christian Borchgrevink

Bjørn Erik Kvilesjø

Inge Wold

A separator arrangement in a multiphase production system. A closed separator container includes a top and a bottom, an inlet for production fluids at an inlet level and at least one outlet for at least partly separated liquid at a level lower than the inlet level. The container outlet is connectable to a liquid pump arranged downstream of the container. A gas accumulator is arranged for by-passing the pump. The gas accumulator includes an inlet end connectable to a top region of the container and an outlet end connectable to a discharge side of the pump for flow communication between the container and the discharge side of the pump. A region near the inlet end the gas accumulator is connected to a supply of injection liquid that is controllable via a valve to be injected to the discharge side of the pump via the gas accumulator. A method for gas by-pass of a liquid pump in a multiphase production system.

Separator arrangement and method for gas by-pass of a liquid pump in a production system

A method and an apparatus for establishing a hydrate free regime in a subsea production flowline before discharging into the subsea production flowline a production flow of hydrate prone hydrocarbon product pursuant to a shutdown or at an initial start of production. The hydrate free regime is achieved by injecting into the flowline a heated water volume in advance of discharging the hydrocarbon product from the subsea production system.

Method and an apparatus for cold start of a subsea production system

A technique is provided for producing a slurry of solid particulates and hydrocarbon production fluid for transport via a subsea flow line. The technique utilizes a cold flow system that cools production fluid to a temperature below the temperature at which hydrates and other substances precipitate from the production fluid and form solid particulates. An instrumentation and control system is used to receive and process data from sensors in the system. The instrumentation and control system then provides control signals to one or more components of the cold flow system to produce a slurry having solid particulates with desirable characteristics. In addition, a cooling gas may be used to facilitate sub-cooling of the production fluid. The cooling gas is compressed and cools the production fluid as the gas expands via Joule-Thompson expansion. Furthermore, a discharge pressure controller may be used to control flow through the cold flow system.

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Gjettum, Norway

John Daniel Friedemann