spe aberdeen mariner-250913- final

8/11/2019 SPE Aberdeen Mariner-250913- Final

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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



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



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



12/41Maureen depositional model



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



17/41Post 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


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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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


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


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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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 ?

spe aberdeen mariner-250913- final

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