1 - Classification: Internal 2010-04-23

EOR in Statoil

IEA-EOR Aberdeen 20.10.10

Benedicte Kvalheim

2 - Classification: Internal 2010-04-23

Outline

• EOR definition in Statoil

• IOR/EOR challenges

• Focused methods in Statoil

• Enablers

3 - Classification: Internal 2010-04-23

Source:

Adressa.no

EOR perspective

4 - Classification: Internal 2010-04-23

IOR- EOR definition Extensive recovery “toolbox” used by Statoil

• Pressure depletion

• Water injection

• HC gas injection

• WAG and FAWAG

• MIOR

• CO2 injection

• Chemical methods

• Thermal methods

• Vertical wells

• Horizontal wells

• Multilateral wells

• TTRD wells

• DIACS wells

• ERD wells

• HPHT high-angle wells

.

WAGINJECTION A-11

PRODUCTIONA-10, A-13

NESS

ETIVE

RANNOCH

INJ. WATER WATER OIL GAS

msegim petek.ejj.flw

• Topside processing

• Sub sea separation

• Sub sea compression

• Down hole pumping

5 - Classification: Internal 2010-04-23

2,5 bill. Sm3

(= 15,7 bill. Bbl)

1 prc.point =

270 bill NOK

(45 bill. USD)

Visions for NCS – The Aam report

6 - Classification: Internal 2010-04-23

Source: NPD

IOR challenges for NCS

7 - Classification: Internal 2010-04-23

Source: Petoro

Costs increases more than expected:

•Increase in drilling cost

•Increase in operational cost

•Increase in modification costs

Planned shut-downRisk of earlier

shut-down

Production decreases faster than expected:

•Lack of reservoir understanding

•Reserves pr. well smaller than expected

•Too few production wells drilled pr.year

Planned

income from

production

Planned costs

IOR Challenges for NCS

8 - Classification: Internal 2010-04-238 - Classification: Internal (Restricted Distribution) 2010-07-06

Ultimate Recovery as a KPI in Statoil

0

200

400

600

Statfjord* Oseberg Gullfaks Troll Snorre

1986

1996

2008

2009

Expected recoverable oil

(million Sm3 oil)

*Norwegian share

Getting ever more oil out of the ground

9 - Classification: Internal 2010-04-239 - Classification: Internal (Restricted Distribution) 2010-07-06

Existing and new measures from AMAP 2010

10 - Classification: Internal 2010-04-23

Window of opportunities

• Oil field in late life – facing shut down

• EOR as an IOR enabler:

− 6% of Statoil’s IOR portfolio in 2010

• Focused technologies

• Deep diversion of water flooding

• Low salinity water flooding,

• Polymer assisted water flooding

• MEOR (microbial EOR)

• Environmental goals on no harmful discharge to sea

and limited emission to air

− Limit EOR to fields with PWRI

− R&D on “green” substitutes

Buoy loading Heidrun. Source: Statoil

11 - Classification: Internal 2010-04-23

IOR enablers - Water diversionMethods for Efficient Drainage

Improve the volumetric sweep efficiency

• Simulations show 2-7% increase in production

• Alternative to drilling of new wells into areas

with very uncertain flooding pattern

• Environmentally acceptable chemical system

Current activities:

• Design parameters for pilot

• Potential evaluation for chemical treatment

• Area by area

Implementation:

• Pilot on the Gullfaks in Q2 2011

12 - Classification: Internal 2010-04-2312 - Classification: Internal (Restricted Distribution) 2010-07-06

CO2 for EOR at NCS

• Challenges at the NCS:

− Large well spacing

− Very costly offshore modifications

− Extensive use of gas injection and water injection –> low residual saturations

− Contamination of sales gas

• Extensive CO2 injection studies for:

− Gullfaks

− Heidrun

− Grane

− Volve

− Oseberg Øst

− Brage

Modified from NPD Factmaps

TrollGullfaksStatfjord

Åsgard

Snøhvit

Oseberg

Grane

Snorre

Sleipner

Heidrun

Norne

SH experiences with CO2 and HC gas inj. – Fields evaluated of CO2 for

EOR

14 - Classification: Internal 2010-04-23

EOR methods – focused in Statoil

• Deep diversion methods

− BW, Silicate, LPS

• Low salinity water flooding

• Polymer assisted polymer flooding

• MIOR

15 - Classification: Internal 2010-04-23

Source: Dagblandet.no

The EOR road to success

16 - Classification: Internal 2010-04-23

EOR in Statoil

Benedicte Kvalheim

Head of IOR department

bekva@statoil.com, tel: +47 41 60 30 58

www.statoil.com

Thank you