CO2 from Natural Gas Sweetening to Kick-Start EOR in the North Sea

1. CO2 from Natural Gas Sweetening to Kick-Start EOR in the North Sea
Marit J. Mazzettia, Ragnhild Skagestadb, Anette Mathisenb, Nils H. Eldrupb
Marit.Mazzetti@sintef.no
Nordic CCS Competence Centre

2. Sweetening the deal for CCS
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For some fields Gas Sweetening is used to remove CO2 from natural gas before export
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Some not yet developed oil and gas fields at Utsira/Barents Sea/Northern Norway have CO2 levels >2,5%
•
Steady supply of CO2 which is necessary to start an EOR project
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Location onshore close to ‘source & sink’
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Economies of scale significant for volumes of CO2 captured of up to 2-3 Mt/year

3. A selection of NCS wellbores on the NCS with CO2 content above 5%
Based on data from NPD fact pages, adapted from CO2 Storage Atlas Norwegian North Sea[1] (Vinni and Njord in Norskehavet outside Trondheim, West Vanguard - off coast of Lofoten in Northern Norway)
25 fields CO2 >5% 8 fields CO2 >10

4. MDEA Sweetening Process
New MDEA plant at Generic Site
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CO2 in feed 10%
•
Reduce CO2 to 2.5%
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compress CO2 to 70 bar
•
optimal site onshore
•
shortest possible distance for CO2 transport to storage or EOR site
Natural Gas Composition
Inlet values
(mol %)
Mass flow in
(tonne/h)
Mass flow out
(tonne/h)
CH4
83.6
567
567
CO2
9.9
186
55
H2O
6.3
48
2
Pressure (bar)
70
Temperature (C)
40
Economic parameter
Value
Unit
Rate of return
7
%
No of operating years
23
years
Construction time
Capture cost
2
Year
Not avoided cost

5. Cost CAPEX and OPEX Nth of a kind plant
Location CAPEX (k€) OPEX (k€/yr) Capture Cost (€/ton) Generic location 60000 33272 34.2 Remote location 90000 34470 37.8

6. Cost Savings Nth of a kind Plant
•
Cost is 30% lower than the cost of the conventional amine MEA technology for CO2 capture from flue gas
•
Norway: Combined CO2 taxes and ETC total 55€/tonne

7. Cost of different NORDICCS Case Scenarios - Nth of a kind (NOAK) Capture Technology

8. Kick-start CCS
•
CCS project with natural gas sweetening/EOR shows promising economy
–
Removal cost from natural gas 30% lower than from flue gas
–
Potential additional cost reduction from use of CO2 for EOR
•
Steady supply of CO2 needed to kick-start deployment of CCS
–
Central hub for CO2
–
CO2 EOR at a nearby oil field
•Create a market for CO2 for land-based industry
– allowing start of industrial CCS projects.

9. Acknowledgements/Thank You/Questions
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This work is supported by the NORDICCS Centre, performed under the Top-level Research Initiative CO2 Capture and Storage program, and Nordic Innovation.
•
The authors acknowledge the following partners for their contributions: Statoil, Gassco, Norcem, Reykjavik Energy, CO2 Technology Centre Mongstad, Vattenfall and the Top-level Research Initiative
(Project number 11029)