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Mariner sanctioned Dec. 2012
Mariner Field : a challenging UK heavy oil development: Statoil - SPE Meeting 25 Sep
Largest CAPEX commitment on the
UKCS for over a decade
Gross investment of more thanUSD 7 billion
Half to be spent between 2013-
2017
Statoils experience and technology will
unlock large reserves Approx. 2 billion boe in place
More than 250 mboe reserves
Production for 30 years
Average production of ~55,000
bbls/d over the plateau period2017-2020
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Inefficient recovery process & low recovery rate
Low flow rates
Early water break-through
High water-cut
High development costs
Many, advanced wells required
Efficient well artificial lift system
Large liquid & moderate oil capacity
Produced water treatment for re-injection
Special attention to crude handling
Meeting crude specifications
Storage, transportation and marketing
High TAN-valueWhy offshore heavy oil is challenging!
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BRESSAY
MARINER
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BRESSAY
MARINER
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1977: 2D seismicacquired across
9/12 (P254)
1980: P335licence awarded
to Union Oil(Mariner)
1981:Marinerdiscovered 9/11-
1 well
1982: 2D seismicacquired across
9/11 (P335)
1982: wells 2, 3& 4 drilled
1991: P726licence awardedto ConocoPhillips
(Mariner East)
1994: Hessbecomes
operator of P335
1995-1996: 3Dseismic acquired
1996: Texacobecomes
operator of P335& P726
1996-1997: wells5 to 12 drilled,including EWT
2005: Chevronbecomes
operator of P335
2005: 3D seismicreprocessed
2008: Statoilbecomes
operator of P335& P767
2008: HR 3D andcore area OBS
acquired
2012: Broadband3D acquired
2017: FIRST OIL
Mariner: project history
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9/41Mariner
Mariner is currently one of the
largest undeveloped resources in
the UKCS.
Discovered in 1981.
With nearly 2 billion barrels STOIIP
So why has Mariner remained
undeveloped for so many years?
Heavy oil 1114 degrees API
Highly Viscous / High TAN
Offshore North Sea environment
Mariner Field : a challenging UK heavy oil development: Statoil - SPE Meeting 25 Sep
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10/41Palaeocene Stratigraphy
East Shetland Platform
500m
1000m
1500m
(Modified. from J. Gjelberg)
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9/11a- 7 Maureen core
Maureen seismic sectionMaureen well correlation
9/11a- 7 Maureen well logs & image logs(Ahmadi, et al. 2003, Millennium Atlas)
Maureen Resevoir
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12/41Maureen depositional model
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13/41Maureen stepped OWCs
Reference case Maureen compartments
Fault rock types
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Heimdal channels
Direct sediment by-
pass down delta front
slope during low-stand
Clinoforms/timelines
Maureen Formation
Lista Formation
Lower Heimdal Middle Heimdal
Upper Heimdal Late stage Lista
Heimdal depositional model
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MAUREEN
LISTA
DORNOCH
injectite cross-cutting primary reflection analogue to upper sands
Structure map
Post depositional remobilisation
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Rock Physics Template
VP/VS
Acoustic Impedance
BASE TERTIARY
LISTA
DORNOCH
Seismic sectionSeismic gather
Seismic challenges
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Heimdal sands prove difficult to image
on seismic streamer data and so the
current Heimdal reservoir model is
stochastic.
Ocean Bottom Seismic (OBS) survey
gives a good image of the sands, but
has lower resolution.
In 2012 Statoil acquired a full field
broadband survey (currently beingprocessed).
primarily aims to better resolve
the Heimdal channels.
A better handling of the Heimdal will
enable a deterministic reservoirmodel, which can be utilised for
Heimdal well placements.
Seismic challenges
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Mariner Drainage Strategy
Drainage Strategy
Pressure maintenance / Reservoir Flooding by
Produced Water Re-Injection
Maureen Reservoir:
17 Horizontal Producers
5 Slanted Injectors
Produced first
Heimdal Reservoir:
Inverted Nine-Spot Pattern
39 Dual, Slanted Producers
32 Single, Slanted Injectors
Seven wells planned for further appraisal
Inverted-nine-spot
pattern, 400 x 400 m
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MarinerProduction Profiles
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Heimdal Water
InjectorsHeimdal Dual Oil
Producers
Maureen Water
Injectors
Maureen Oil Producers
Mariner Field
Maureen Main
17 Producers
5 Water Injectors
Heimdal
46/39 Dual MLTs
32 Water Injectors
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Many Challenges.
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Mariner Well Types
Heimdal Short Injector
Maureen Short Injector
Maureen Long Injector
Maureen Short Producer
Maureen Medium Producer
Maureen Long Producer
Heimdal Medium Injector
Heimdal Long Injector
Heimdal Ext Reach Injector
Heimdal Long Producer
Heimdal Short Producer
Mariner Field : a challenging UK heavy oil development: Statoil - SPE Meeting 25 Sep
Well Type Days
Single Maureen Producer 46.0
Single Maureen Water Injector 47.0
Heimdal MLT Producer 73.0
Heimdal Water Injector 41.0
Heimdal MLT sidetrack 70.0
Heimdal WI sidetrack 37.0
Time
D illi O ti H i d l MLT W ll
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Window
Position
Drilling OperationsHeimdal MLT Wells
Pump
Position
13 3/8in
Casing
Reservoir
Target
Target
Box
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WellDesign
27
Sand Control Packer
Sand Screens
Zone Isolation
7-5/8' tubing
5-Chemical Injection Valve
Production packer
Ball Valve, 5-
Safety Valve, 5-
Seal Assy f/Sand Control packer
Packer
ESP
Pump
ESP
Motor
ESP
Seals
ESP Cable
ESP Discharge
Slim Tubing Disconnect
Slim Tubing Back-Flow Valve
2-7/8" Tubing
Producer
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Mariner Platform
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Mariner Platform
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Intervention and Completion Unit (ICU)
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Intervention and Completion Unit (ICU)
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Intervention and Completion Unit (ICU)
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The field development concept
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Mariner FacilitiesWorld map
UK, London:
PU and LQ engineering (CB&I)
Drilling engineering (RDS)
Jacket engineering (SNC Lavalin)
Heavy lift (Saipem Ltd) South Korea, Okpo:
PU and Drilling construction
Ulsan:
LQ and Wellhead extension
construction
Singapore: EPC
Contract for Jack-Up
Rig to Sembcorp M.
@Jurong Yard
China: Flare boom
construction
Spain, Cadiz:
Jacket construction Dragados)
South Korea, Geoje
(Option): FSU construction
Mariner Field : a challenging UK heavy oil development: Statoil - SPE Meeting 25 Sep
Aberdeen:Home Office
Singapore: CB&I
PU engineering
(back office)
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Aberdeen
Projected benefits for the UK
Significant tax revenues
Operations centre in Aberdeen
700 long term jobs
Knowledge and technology transfer
for future UK projects
Local contractors for support
services, maintenance &
modifications
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Technical advances unlocking Mariner
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Isometrix Seismic
Conventional Streamer Seismic
OBC Seismic
Multi-lateral wells
Objective: higher reservoir
exposure and reduced cost
Concept: branched wells
Advanced
geosteering
Objective: improved well
placement
Concept: advanced
logging-while-drilling tools
Autonomous inflow
control valves
Objective: reduced inflow
of water in oil producers
Concept: self-adjusting
valves
Optimised water
injection strategy
Objective: improved
sweep in the reservoir
Concept: optimise number
and placement of injectors
Infill wells
Objective: higher reservoir
exposure
Concept: identify new
drilling targets
Polymer injection
Objective: improved
sweep in the reservoir
Concept: inject polymer to
increase water viscosity
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Mariner Field : a challenging UK heavy oil development: Statoil - SPE Meeting 25 Sep
First Steel Cut Rolled Leg Section
Diameter 2m
Thickness 80mm
Weight approx.10 tons
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Acknowledgements
Statoil UK Ltd.
JX Nippon Exploration and Production (U.K.) Limited
Alba Resources Limited,
a wholly owned subsidiary of Cairn Energy PLC
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Animations
Jacket Installation
8.30 mins
Topsides Installation
7.02 mins
Cat J Jackup5.58
mins
Cat J working at
Mariner2.13 mins
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h k ?