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Smart technology for CO 2 handling subsea Pål Helge Nøkleby Aker Solutions 2 nd International Workshop on Offshore CO 2 Geologic Storage Beaumont, Texas, USA 19-20 June, 2017 Presented by Lars Ingolf Eide 1

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Page 1: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Smart technology for CO2 handling subsea

Pål Helge Nøkleby

Aker Solutions

2nd International Workshop on Offshore CO2 Geologic Storage

Beaumont, Texas, USA

19-20 June, 2017

Presented

by

Lars Ingolf Eide

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Page 2: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Main Challenges to offshore CO2 EOR• CO2 supply chain not established

– limited availability of CO2

– forecasted need for large volumes

• Facilities and wells are not corrosion resistant

• Limited weight and space available for topside separation on most platforms

• Extremely costly retrofits and additional installations

• Loss of production due to shut down in retrofit period

Øyvind Hagen - Statoil ASA

Slide 2

Page 3: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Subsea CO2 processing

• Rarely described in literature

• System would

– Be designed to ensure that the oil and gas to processing facilities contains a limited amount of CO2, reducing or removing the need for retrofitting for a corrosive environment

– Reduce the need for space and weight topsides

• Space for some utilities will be needed (supply of power, MEG/methanol etc.) unless they are supplied from shore or another facility.

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Page 4: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Available Subsea Processing Building Blocks

Injection XT

Production XT

Subsea process system building blocks

• Subsea multiphase cooler• Subsea gas compressor• Subsea gas/liquid separator• Subsea liquid/liquid separator• Subsea de-sanding

equipment• Subsea produced water de-

oiling equipment• Liquid pump• Multiphase pump• Subsea control systems• Subsea power solutions

Page 5: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

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Subsea CO2 Processing

Gas/liquid separator

Oil/water separator

Water for reinjection

Oil/water to processing

facility

HC gas with remaining CO2

CO2/HC gas separator

CO2 for reinjectionCooler

Well stream

Main functions of a typical processing concept for CO2-EOR. (Courtesy Aker Solutions)

Page 6: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Subsea CO2 Processing

• Subsea systems are modularized to enable easier installation and retrieval operations

• Compact equipment is mandatory to minimize module size and weight in order to open up for more flexibility with regard to vessel selection

• Several subsea processing projects have been installed and are in operation for various applications

• No systems have yet been installed for subsea CO2 handling

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Page 7: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Aspects of the CO2 Subsea Technology Concept

• Potential mitigation of several previous challenges

• Small subsea facilities serving segments in large reservoir

• Facilities available for injection of CO2 for permanent storage

• Retrievable modules

– limited operational time and reuse

Slide 7

Page 8: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

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New Concept: Zero-emission Offshore Power

(Courtesy Aker Solutions)

Reduce Offshore Emissions +Produce CO2 for EOR – locally

• Use “short travelled” local gas

– Associated gas in oil-fields

– Stranded gas in gas-fields

• Produce zero-emission power

– Offshore electrification

– Sell excessive power to gird

• Use CO2 & Heat for added value

– Hot and liquid CO2 and H2O

– CO2 is “short travelled” for EOR

– After use, permanent storage

Page 9: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Novelty: Pressurized Oxyfuel = Big Savings

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80

70

60

50

40

30

20

10

100

90

(Courtesy Mitsubishi Hitachi Power Systems Europe)

■ 70% saving on CAPEX economically viable offshore

■ 80% reduction in size suitable for subsea application

■ Scope for further reduction by going for unconventional boilers

HIGH-PRESSURE BOILER (conventional shell & tube)15 meters

LOW-PRESSURE BOILER(conventional shell& tube)75 meters

Page 10: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Oxyfuel: enabler for offshore CO2 EOR

• Oxy-fuel combustion burns hydrocarbon gas in pure oxygen instead of air

• Will normally require a high degree of exhaust gas recirculation

• Can tolerate high amounts of CO2 and other contaminants in the feed gas; thus well-suited for:

– Enhanced gas recovery (EGR) and EOR –it can take all the back-produced CO2 in with the feed gas thus eliminating the need for additional CO2 separation

– CO2 rich gas fields – it could enable economic developments by producing electricity

10(Courtesy Aker Solutions)

Åsgard Subsea

Compressor Station:

Operational since

September 2015

New concept “cousin”

of Åsgard Subsea

Compressor Station:

I.e., most building blocks

field proven

Page 11: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Conclusions

• New and emerging subsea technologies can enable technically and economically feasible concepts for offshore CO2 EOR

• Utilizing such established infrastructure could also enable permanent storage of CO2 in depleted offshore oilfields - post the commercial EOR period

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Page 12: Smart technology for CO2 handling subsea - … · • Subsea multiphase cooler • Subsea gas compressor • Subsea gas/liquid separator • Subsea liquid/liquid separator • Subsea

Thank you for the attention!

For detailed questions and more information,

please contact

Pål Helge Nøkleby, Aker Solutions

[email protected]

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