Transcript
NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019
Seabox™ and SWIT™- Subsea water treatment and injection
Extend field life and increase oil recovery using subsea
water treatment and injection
Torbjørn Hegdal
Seabox AS
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Headlines
• Seabox™ extended testing completed June 2018, demonstrating superior performance compared to topside solutions
• Seabox™ in operation since September 2018 at Ekofisk for ConocoPhillips, testing reservoir
• SWIT™ (sulfate removal) system testing ongoing.
• Seabox™ at TRL 6, SWIT™ at TRL 6 second half 2019
• Seabox™, the backbone and enabler for long term and reliable performance of membranes (SRU)
o Clean water a pre-requisite for long term and maintenance-free operations of membranes
• Opens for new ways to develop new fields and optimizing existing fields – all subsea or in combination with topside
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Seabox™ and SWIT™
Tailored water
• Removing sulfate
• Reducing salinity
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Seabox™ and SWIT™ technology
• Water for matrix flooding, sulfate-free water and low-salinity water
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Intervention Intervals (years)
4 2.5 5 2.5
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Seabox™ - subsea water treatment module
• CFD simulation
• 5 micron particles
• 24 ‘inclined plates’
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The value of flexibility in reservoir managementSeabox™ / SWIT™ provides tailored water qualities at the seabed
A ‘distributed’ solution with stand-alone subsea facilities
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‘Normal Treatment’:Disinfect to prevent reservoirsouring and remove particlesto avoid blocking
‘Matrix Flooding’:Remove all suspended solids, with an absolute filtration of 0.1 micron
‘Reduce Salinity’:To alter wettability in reservoir to produce initially non movable oil
‘Sulfate Removal’:To avoid scaling due to injection water not being compatible with formation water
Seabox™ Seabox™, andUltrafiltration
Seabox™, Ultrafiltration, Feed pump, and Nano / RO membranes
Source: Ministry of Petroleum and Energy
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Water injection options
• Seabox and SWIT can be located on seabed and supply high quality water to local host (Hybrid solution), or
• Can be interfaced with a subsea injection pump and paired directly with injection wells
• Replaces complex topsides system with simplified subsea system enabled by high quality source water in deep water
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Seabox™ qualification testing
Extended verification testing of industrial version in Norwegian Fjord, February – May 2018
• Solids removal 99% larger than 8.5 micron
• Bacteria kill in Top Quartile of topsides performance
o ATP 5 – 10 times lower than equivalent topside
o Planktonic GHB and SRB – below detectable level
o qPCR – below detectable limit
• Successful demonstration of Seabox simplicity and reliability over test period
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Installation of Seabox™ February 2018
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Seabox™ manufacturing and deployment
• Components
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©2018 NOV | Proprietary and confidential. | 12
All electric
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Seabed seawater processing
• Processed water to host,
or
• Direct to subsea injection pump coupled to injection well
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Seabox™
Seabox™ andUltrafiltration
SWIT™: Seabox™, Ultrafiltration, Feed pump, andNano / RO membranes
or, treated waterto host
Treated water to subsea WI pumpand well
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Enhance existing WF treatment
• Improves existing WF hardware by providing high quality feed water
• Can enable change from filter spec to membrane spec water with minimal interruption in topsides
o Safer
o Faster
o No PoB issues
• Water sourced from deep water is colder and provides material improvement in topsides compressor efficiencies
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Platform structure
Umbilical
10’’ Flexible hose
Caisson connection
Seabox module
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ConocoPhillips – Ekofisk, North Sea
Installed August 2018
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Source: ConocoPhillips
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Seabox™ and SWIT™A ‘significant simplification’ compared to topside
• Removing sulfate
• Reducing salinity
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A DB C
Seabox™
Nano / RO membranes
Ultrafiltration
Feed pump
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