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Technical Innovation for Floating LNG
Bengt Olav Neeraas & Jostein Pettersen, Statoil ASA
3rd Trondheim Gas Technology Conference, 4-5 June 2014
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Table of contents
2
Relevant know how for FLNG
FLNG concept development
Technology development & innovation
Conclusions
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Snøhvit LNG barge A precursor to FLNG
3
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Extending current skills Combining the experience
4
Snøhvit LNG - Hammerfest
• Process facilities built on floating barge –
an FLNG precursor
• Compact layout
• Modularized and prefabricated facilities
Global floating production operations
• Floating production units in operation worldwide
• Offshore offloading in harsh conditions
• Gas processing and acid gas removal on floating unit
3rd Trondheim Gas Technology Conference, 4-5 June 2014 5
Snøhvit technology learning Supporting FLNG development
• Snøhvit field development and
Hammerfest plant – a full LNG value chain
• Direct feed to LNG plant from subsea wells
• Use of LM6000 aero derivative gas
turbines
• Reinjection of CO2 from feed gas
• Mixed refrigerant liquefaction process with
sea water cooling
• Operation in harsh environment
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Statoil FLNG concept development history
6
Kelp Deep
4 Mtpa
Fylla/Snøhvit
5 Mtpa
NnwaDoro
6-8 Mtpa
Shtokman
3 x 5 Mtpa
NnwaDoro
6 Mtpa (incl. oil)
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
Snøhvit
3 Mtpa
NnwaDoro
6 Mtpa
Generic/Angola
1 Mtpa Generic HLG
1.5 Mtpa
Feasibility
2.5 Mtpa
Pre-FEED
3.3 Mtpa
3rd Trondheim Gas Technology Conference, 4-5 June 2014 7
Statoil FLNG
• Developed to pre-FEED level
• Varying feed gas composition
• DMR liquefaction process with
mechanical compressor drivers
• Side-by-side or tandem offloading
• External or internal turret
• Alternative lay-outs
• Developed in cooperation with
major engineering contractor
• Supplier group participation
LNG Capacity 3.0 - 3.5 Mtpa
Overall length 425 m
Beam 65 m
LNG storage 225 000 – 275 000 m3
Statoil FLNG, base concept
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Acid gas removal Sensitive to tilt and motions
8
Specification:
< 50 ppm CO2 in treated gas
Example:
• 10 mole % CO2 in the feed gas
• Bypass of more than 0.05% of gas
flow gives off spec composition
Amine
Gas
Ideal situation Tilted situation
Amine
Gas
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Acid gas removal Statoil safeguarding solution for FLNG
9
Standard Amine plant Safeguarding solution (patent pending)
Typical design margins for FLNG
- Increase amine circulation
- Increase absorber diameter and height
- Increase number of beds
Treated gas
Lean amine
HC + acid gas
Rich amine
Absorber
Regenerator
Solvent HP pump
Flash
MP Flash
LP Flash
Acid gas
Acid gas
Reboiler
Solvent booster pump
Solvent booster pump
Semi lean/lean HX
Solvent cooler
Filtration and skimming
Feed gas
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Cryogenic LNG heat exchanger Sensitivity to tilt and motions
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Single bundle heat exchanger*
Multiple bundle heat exchanger**
* Courtesy of Linde Engineering
** Courtesy of Air Products
50m+
~5m
~20m
~5m
How will the heat exchanger
performance be affected by
tilt and motions ?
Test program performed in
co-operation with Linde
Engineering 2003-2007
CFD model developed
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Video - Test heat exchanger in oscillation
11
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Deep sea-water intake systems Beneficial with low temperature cooling water
• Increased process efficiency
− ~1% increased production/°C
• Increased gas turbine power
− Cooling of intake air
− ~1,5% increased power/°C
12
Typical SW temperature profile
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Deep sea-water intake systems Principle system configurations
13
- 1300 m
- 1000 m
5C0
~30C0
SEAWATER
DRAW DOWN
SEABOTTOM FIXED TURRET
VESSEL
MANIFOLD
FLEXIBLE HOSE, 7-OFF
SEAWATER INLET PIPEINTEGRATED IN THE RISER TOWERSTEEL STRUCTURE
- 1300 m
- 1000 m
5C0
~30C0
SEAWATER
DRAW DOWN
SEABOTTOM FIXED TURRET
VESSEL
MANIFOLD
FLEXIBLE HOSE, 7-OFF
SEAWATER INLET PIPEINTEGRATED IN THE RISER TOWERSTEEL STRUCTURE
- 1300 m
- 1000 m
5C0
~30C0
SEAWATER
DRAW DOWN
SEABOTTOM FIXED TURRET
VESSEL
MANIFOLD
FLEXIBLE HOSE, 7-OFF
SEAWATER INLET PIPEINTEGRATED IN THE RISER TOWERSTEEL STRUCTURE
SW risers through turret Free hanging SW risers
3rd Trondheim Gas Technology Conference, 4-5 June 2014
LNG tandem offloading Based on Statoil patents, licensed to OneSubsea
14
Cryodyn flexible pipe
OCT system
3rd Trondheim Gas Technology Conference, 4-5 June 2014
LNG side-by-side offloading Based on Statoil idea – Development by MacGregor Pusnes & Statoil
15
3rd Trondheim Gas Technology Conference, 4-5 June 2014
• The realization of FLNG requires fit for
purpose technologies
• Important focused technologies;
− Cryogenic heat exchangers
− Acid gas removal
− LNG offloading
− Deep sea water intake
− Layout, process selection and safety
• FLNG concept development has been
matured and a basic concept is selected
16
Conclusions
3rd Trondheim Gas Technology Conference, 4-5 June 2014
Technical Innovation for Floating LNG
Bengt Olav Neeraas
Principal Researcher
Tel: +4790881743 www.statoil.com
17