Den Norske Stats Oljeselskap A.s.

Statoil Asa

Other

Linde Aktiengesellschaft

Pentti Paurola

Arne Olav Fredheim

Manfred Steinbauer

Kare G Breivik

Christian Pfeiffer

Rudolf Stockmann

Oystein Sorensen

Knut Vebjørn Grande

Wolfgang G Forg

Jørgen Eide

Karina Heitnes Hofstad

Harald Vindspoll

Otto Skjåstad

Reidar Vik

Sigbjo Slashedrn Lillesund

Manfred B&ouml;lt

Wolfgang F&ouml;rg

Arne Olay Fredheim

Manfred Bolt

Arne O Fredheim

The present invention provides a method of recovering a hydrocarbon mixture from a subterranean formation comprising: (i) injecting an oxygen-rich gas into said formation; (ii) combusting said oxygen-rich gas in said formation thereby heating and reducing the viscosity of said hydrocarbon mixture and generating CO-rich gas; (iii) recovering said heated hydrocarbon; and (iv) capturing at least a portion of COfrom said CO-rich gas.

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The invention relates to a natural gas liquefaction process and particularly to one suited to use offshore. The invention provides a natural gas liquefaction apparatus wherein a carbon dioxide based pre-cooling circuit is provided in a cascade arrangement with a main cooling circuit. The invention also extends to a natural gas liquefaction apparatus wherein a main cooling circuit uses as a refrigerant a gas stream, at least a portion of which is derived from a raw natural gas source.

Natural gas liquefaction process

A system for supplying cooling water to a process on board a floating vessel for the production of hydrocarbons, wherein the vessel () is anchored by means of a bottom-anchored turning unit () mounted in a receiving space () in the hull () of the vessel and allowing turning of the vessel () about the turning unit, and wherein the turning unit () supports a swivel unit () for the transfer of hydrocarbons from production risers () extending between the seabed and the turning unit (), the system comprising a conduit means () depending from the vessel () to a depth for taking in cooled sea water, and a pump means () for pumping of the sea water from the conduit to a place of use for the process. The turning unit () is designed as a seawater swivel, the unit being provided with one or more passages () for receiving upper end portions of respective seawater risers () constituting the conduit means, and with a means for transferring sea water from the upper end portions of the risers () to an annulus () arranged at the boundary surface between mutually movable parts () of the turning unit () or between the tuning unit () and the vessel hull (), and communicating with one or more passages () arranged in the vessel hull and leading to said place of use, a seawater sealing means () being arranged on each side of the annulus ().

Cooling water system

In the liquefaction of a hydrocarbon by indirect heat exchange with the refrigerant mixture of a refrigerant mixture cycle, the refrigerant mixture being compressed in multiple stages, the compressed refrigerant mixture ( ) is at least partially condensed (E ) downstream of the penultimate compressor stage and is fractionated (D ) into a higher-boiling liquid fraction ( ) and a lower-boiling gas fraction ( ). The lower-boiling gas fraction ( ) is compressed to the final pressure, partially condensed (E ) and fractionated (D ) into a lower-boiling gas fraction ( ) and a higher-boiling liquid fraction ( ). The higher-boiling liquid fraction ( ) is added to the partially condensed refrigerant mixture stream ( ), and the gas fraction ( ) forms the lower-boiling refrigerant mixture fraction and the liquid fraction ( ) forms the higher boiling refrigerant mixture fraction of the refrigerant mixture cycle. Alternatively, the compressed refrigerant mixture ( ) can be partially condensed (E , E , E ) after each compressor stage and fractionated in each case into a lower-boiling gas fraction ( ) and a higher-boiling liquid fraction ( ). Only the gas fraction ( ) from the partial condensation (E , E ) in each case is further compressed and the liquid fractions ( ) from the second fractionation (D , D ) are added to the partially condensed stream ( ) from the first compressor stage upstream of its fractionation (D ). The gas fraction ( ) from the final fractionation (D ) forms the lower-boiling refrigerant mixture fraction and the liquid fraction ( ) from the first fractionation (D ) forms the higher-boiling refrigerant mixture fraction of the refrigerant mixture cycle.

Process for liquefying a hydrocarbon-rich stream

The invention relates to a method for liquefying a stream rich in hydrocarbons, especially a stream of natural gas, by the indirect exchange of heat with the refrigerants in a closed-circuit cascade of mixed refrigerants. According to the invention, said closed-circuit cascade of mixed refrigerants consists of at least 3 circuits of mixed refrigerants, with each circuit comprising different refrigerants. The first of the three mixed refrigerant circuits is used for pre-cooling (E,), the second for liquefying E,), and the third for super-cooling (E,) the hydrocarbon-rich stream (,) to be liquefied. The method provided for in the invention reduces specific energy consumption and investment costs since the three circuits of mixed refrigerants are or can be optimally adjusted to the enthalpy temperature curves of the hydrocarbon-rich stream to be liquefied and the refrigerant mixtures.

Method for liquefying a stream rich in hydrocarbons

Process, plant and overall system for handling and treating a

Method and system for offshore production of liquefied natural gas

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Hafrsfjord, Norway

Pentti Paurola