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Clean seas. Your choice. Our mission.
Waste treatment at source

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© Nature Oil & Gas AS
Nature Group is a market leader in handling maritime (Marpol) and offshore waste, with more than
25 years collection, treatment and engineering experience.
Products and services:
OIL & GAS: Provide mobile units and personnel to treat on and offshore waste generated during oil
and gas exploration, production and decommissioning.
MARITIME : Collect and treat maritime waste according to MarpolAnnexes I-V.
ENGINEERING:
Design, engineering, installation and maintenance of on and offshore waste treatment solutions.
Clean seas. Your choice. Our mission.
Offshore waste solutions

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ABOUT NATURE GROUP OIL AND GAS DIVISION
Nature Oil and Gas was founded in Norway by two
students from the university of Stavanger in 1999.
They had discovered an environmental friendly
way to separate water from slops derived from the
oil and gas industry.
With funding of the Norwegian government further
research was performed to optimise the treatment
process of slops.
The first treatments performed were for Statoil,
Shell, Conoco Philips and Total.
Nature still holds a firm link to the university of
Stavanger as one of it’s main chemists is
concluding his PhD research in 2015.

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WASTE/ SLOP TREATMENT AT SOURCE
Slop is a term used for waste water associated
with the exploration of oil and gas
Slop normally consist of (but not limited to):
• Rainwater
• Deck washings
• Drilling mud (oil and water based)
• Hydraulic spills
• Brine
• Engine room spills
• Completion fluids
• Wellbore washings

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© Nature Oil & Gas AS
NATURE GROUP
SOLUTION
TRADITIONAL SLOP
TREATMENT
95%

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IMPROVE QHSE STANDARDS, MAXIMIZE EFFICIENCY
• Improve QHSE standards;
• less logistics, waste treatment at source,
• prevent spills.
• reduce carbon footprint.
• compliance to the toughest local rules and regulations.
• Strict documentation and control on output.
• Maximize efficiency in comparison to traditional waste management
– Savings between 40 and 70% can be achieved depending on
locationand waste composition.
• Proven technology and experience in diverse climates (arctic-
equator), humid and dry. With all major international oil companies.

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TREATED
WATER
TANK
STU
(Sludge Treatment Unit)
CTU
(Compact Treatment Unit)
First stage
treatment
Final stage
treatment
OVERBOARD
THE COMPLEXITYOF
DRILLINGLIQUIDWASTE
To ensure most efficient treatment
Nature group has designed a two step
process, depending on the complexity of
waste. STU & CTUSLOP TANK

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© Nature Oil & Gas AS
STU: Chemically breaking the emulsion of slops

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© Nature Oil & Gas AS
STU – EMULSION BREAKING

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© Nature Oil & Gas AS

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© Nature Oil & Gas AS
CTU – COAGULATION, FLOCCULATION AND FLOTATION

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CTU – PROCESS FLOW DIAGRAMME
REJECT
INLET
SLUDGE
TURBIDITY METER
CARTRIDGE
BARRIER FILTERS
DISCHARGE
To Mud Skip
From
Slop Tank
Return to
Slop Tank
Mixing Coagulation
and Flocculation
3x Dissolved
Air Flotation
Chemical Injection
DAF Loop
Air
Barrier 2
Clean Water
Barrier 1

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COMPACT TREATMENT UNIT SLUDGE TREATMENT UNIT
Product data
• Small footprint, 12 ft. container
• Norsok Z-015 and DNV 2.7-1
• High treatment capacity, 20 mᶟ/h
• Target discharge less than 5ppm OIW
• Multi power, 400-480 VAC 50/60 HZ
• Low power consumption 16 kW
• User friendly PLC system
• Internal NTU monitor (can be correlated to
independent oil in water analysis).
• Can be linked to STU
Product data
• Small footprint , 14 ft. Container
• Norsok Z-015 and DNV 2.7-1
• Capacity, 10 mᶟ/h
• Hydraulic drive for flexibility
• Multi power, 400-690 VAC 50/60 HZ
• Standalone Unit
• User friendly PLC system
• Can be linked to CTU
The Compact Treatment Unit CTU is
designed for treatment of waste water
on site (light fractions)
The separation technology includes
coagulation, flocculation, unmatched
unique DAF solution, (dissolved air
flotation) controlled by a PLC system.
The Sludge Treatment Unit STU is
designed for treatment of sludge, water
saturated mud etc. on site (heavy
fractions)
The separation technology includes an
emulsion breaker injection system in
combination with a decanter centrifuge.

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Safe Scandinavia
Semi submersible
Operator:
Statoil
Rig Owner/Manager:
Prosafe
Area:
NCS 2016 – Oseberg
Supply Tender Vessel
Equipment:
CTU+STU
Volume – Average ppm:
N/A
REFERENCES
West Hercules
Semi submersible
Operator:
Statoil/Husky
Rig Owner/Manager:
Seadrill
Area:
Canada: 2014-2016
Barents Sea: 2013-2014
Equipment:
CTU+STU
Volume – Average ppm:
2015 – 6 381 m3 - ppm
West Venture
Semi submersible
Operator:
Statoil
Rig Owner/Manager:
North Atlantic Drilling
Area:
NCS 2015
Equipment:
CTU+STU
Volume – Average ppm:
2015 – 1611 m3 – 7,95 ppm
West Alpha
Semi submersible
Operator:
ExxonMobil
Rig Owner/Manager:
North Atlantic Drilling
Area:
Kara Sea 2014
NCS 2015
Equipment:
CTU+STU
Volume – Average ppm:
2015 – 1405 m3 – 9,79 ppm
Songa Equinox
Semi submersible
Operator:
Statoil
Rig Owner/Manager:
Songa Offshore
Area:
NCS 2015
Equipment:
CTU
Volume – Average ppm:
2015 - 1100 m3 – 0,7 ppm

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REFERENCES
Ocean Rig
Corcovado
Drillship
Operator:
Petrobras
Rig Owner/Manager:
Ocean Rig
Area:
Brasil 2013-2015
Equipment:
CTU+STU
Volume – Average ppm:
2015 – 860 m3 – 10 ppm
Ocean Rig Mykonos
Drillship
Operator:
Petrobras
Rig Owner/Manager:
Ocean Rig
Area:
Brasil 2013-2015
Equipment:
CTU+STU
Volume – Average ppm:
2015 – 878 m3 – 6 ppm
West Navigator
Drillship
Operator:
Centrica
Rig Owner/Manager:
North Atlantic Drilling
Area:
NCS 2011-2015
Equipment:
CTU+STU
Volume – Average ppm:
2015 – 1162 m3 – 3,5 ppm
Sevan Driller
Semi submersible
Operator:
Petrobras
Rig Owner/Manager:
Seadrill
Area:
Brasil 2015
Equipment:
CTU+STU
Volume – Average ppm:
2015 – 1582 m3 – 5 ppm

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DISCHARGE DATA
2015/2016 STU CTU sludge M3 OIW PPM Chemicals used
W Hercules Statoil 5612,60 m3 6639,90 m3 3,87% 6381,30 m3 3,46 ppm 1,1 liter/m3
W Navigator Shell 0,00 m3 1164,90 m3 0,22% 1162,40 m3 3,500 ppm 1,1 liter/m3
W Venture statoil 1645,00 m3 1764,40 m3 0,08648832 1611,80 m3 7,951 ppm 3,1 liter/m3
W Alpha exxon 1521,00 m3 1536,00 m3 7,47% 1405,70 m3 9,789 ppm 2,7 liter/m3
Tellus statoil 200,00 m3 2282,00 m3 5,40% 2158,00 m3 3,000 ppm 2,1 liter/m3
Corcovado Petrobras 60,50 m3 898,00 m3 4,23% 860,00 m3 10,000 ppm 1,2 liter/m3
Mykonos repsol 332,00 m3 910,50 m3 3,57% 878,00 m3 6,000 ppm 3,0 liter/m3
Songa equinox Statoil 0,00 m3 1054,20 m3 6,64% 984,20 m3 0,797 ppm 1,2 liter/m3
Sevan Driller petrobras 0,00 m3 1642,00 m3 3,62% 1582,50 m3 5,000 ppm 1,4 liter/m3
Tanzania BG/Statoil 0,00 m3 324,00 m3 0,00% 324,00 m3 5,000 ppm 5,0 liter/m3
Total 9371,10 m3 18215,90 m3 4,62% 17347,90 m3 4,805 ppm 1,7 liter/m3

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GLOBAL ACTIVITIES

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Nature Group
Stavanger
Slettestrandveien 17
N-4032 Stavanger
Norway operations
T: (+47) 51 58 99 00
E: no@ngrp.com
natureog.com
Nature Group
Amsterdam
schiphol 1118CX
Evert van beekstraat 310
The Netherlands
+31646199306
Gert-Jan Davidzon
Gertjan.davidzon@ngrp.com
ngrp.com
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