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GAS RE-INJECTION Total experience. Elisabeth PROUST. Total has been re-injecting gas for years Re-injection is part of long term asset management: Temporary storage before blow down Pressure maintenance EOR Ready for emerging gas value chains

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Presentation Transcript
general main principes
Total has been re-injecting gas for years

Re-injection is part of long term asset management:

Temporary storage before blow down

Pressure maintenance

EOR

Ready for emerging gas value chains

No continuous flaring policy for new developments implemented in 2000

General – main principes

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

re-injection

flaring

A steady decreasing flaring trend is observed since late ’90s

As from 2004, amount of re-injected gas is significantly higher than flared gas.

slide3
Girassol was put on stream in 2001 under a scheme of secondary recovery by water injection

Temporary gas re-injection (up to 8 Mm3/d)

Block 17

500 m

1000 m

1400 m

ORQUIDEA

VIOLETA

LIRIO

ANTURIO

TULIPA

CRAVO

ROSA

PAZFLOR

GIRASSOL

JASMIM

DALIA

1600 m

GIRASSOLFirst Development of Block 17 in AngolaGas re-injection: first step of global gas management

After 5-8 years of gas re-injection, the excess of gas cycling impacts adversely oil production

girassol monitoring of gas re injection through 4d seismic
GIRASSOLMonitoring of Gas Re-injection through 4D Seismic

Red

=

4D

anomaly

  • 1 year after First Oil, a repeat 3DHR was acquired
  • It allowed to :
    • Monitor gas bubble expansion
    • Describe some heterogeneities
    • Predict GOR future development
    • Detect WOC rise
  • A second 4D was acquired 3 years after First Oil
    • Quantify and match gas and water sweep efficiency
    • Assess gain of external gas storage (versus waiting for Angola LNG)
    • Drill additional OP wells
block 17 gas external storage second step of global gas management
Block 17 – Gas External Storage: second step of global gas management

ALNG Plant start-up

Gas injectionin situ

E8A11D - B17 Gas Import & Export

Blocks 0 & 14

9

B17 Gas Import

B17 Gas Export

8

7

6

LNG Plant

5

Gas Rate (MSm3/d)

Angola

4

3

24"

Block 15

2

1

0

Block 2

’’

24

-1

2003

2005

2017

2019

2021

2023

2025

2007

2009

2011

2013

2015

2027

2029

16”

-2

16”

Girassol

Stored Volume

UM Pole

Dalia

Screening of potential storage candidates

Main criteria: seal, homogeneous depletion, well integrity, 0.4 tcf storable

Block 18

Block 2 fields Lombo-East & Tubarao identified as best candidates for external storage

Multiple stakeholders (Block operators, Angola LNG)

Investments of main pipes brought forward, new platform on Block 2

slide6
Common Goal : ensure sustainable oil developments & address gas flaring concerns through a gas valorization scheme

Strong Commitment & Alignment of all Stakeholders : partnership Sonangol - Oil companies

Pooling of gas resources

Legal & Commercial Framework suiting the project characteristics

Strong partners to overcome commercial and technical challenges

phase II

1-4 NAG fields

phase III

Gas Caps blowdown

Phase I :

LNG plant

AG pipelines

Bloc 0/14

Soyo

200 m

Kizomba C

NAG

Kizomba A

Kizomba B

Block 2

GIRASSOL

Greater Plutonio

DALIA

Angola LNG mindset: Third step of global gas managementfrom a gas flaring concern to a gas valorization scheme

Arranging a stable gas supply of 1Bcfd

gas injection for pressure maintenance
Congo – N’Kossa

fuel gas & valorisation

injected gas ~ 80% of total gas

operating flaring

Gas injection for pressure maintenance
  • Liquid production increase:
    • Oil recovery (pressure maintenance)
    • C3/C4 recovery in gas before

re-injection

  • No continuous flaring
  • The future: blowdown of the field

Gas valorization stake for the host country

  • FID: December 1992
  • First oil: June 1996

Gas injection @ 420 bars since first oil

Cumulative gas injected:

  • 30 Gm3 (10 years)
  • 71 MTCO2eq
hydrocarbon gas re injection for eor total experience many successfull eor projects since 90 s
using fatal gas without commercial outlet, thusavoiding flaring, or even commercial sales gas

ABK (UAE) 1991, Handil (Indonesia) 1995, Alwyn (UK) 1999, Jusepin (Venezuela) 2000, Amenam (Nigeria) 2003 ...

HC Gas EOR implies:

Good geological model

Specific design of surface facilities to handle recycled gas

Specific material selection

EOR must be taken into account in initial design (design provisions) => long term asset management

Efficiency:

If miscibility of gas & oil can be met in reservoir conditions (one phase): Excellent recovery factor (>50%) can be achieved

Light oil (°API > 23, viscosity < 3 cp)

Gas rich in intermediate components

Reservoir high pressure and low temperature

If miscibility cannot be met, good recovery factor may be achieved by simple sweeping and swelling of the oil, in addition to pressure maintenance.

Hydrocarbon gas re-injection for EOR Total experience: many successfull EOR projects since ’90’s

NKPP platform

NKPP platform

KPP platform

KPP platform

Gas Lift Platform

Gas Lift Platform

Production Platform

Production Platform

AK Center

AK Center

AKEast

AKEast

Living Quarters

Living Quarters

CO2 EOR: a way to capture and store CO2?

(cf on-going studies on EKOFISK)

emerging gas value chains an alternative to re injection
Emerging gas value chains:an alternative to re-injection
  • Gas transportation:
    • CNG, mini-LNG,
    • gas hydrates
  • Gas conversion to products:
    • GTL, DME, MeOH,…
  • Gas to power:
    • generation and long distance transportation
  • A favourable context for an alternative to gas re-injection:
  • sustained high price of natural gas
  • deployment of emerging ‘energy transport’ technologies or producing new products… suitable for associated gas
  • It may soon be possible to bring value to once-flared gas… based on enablers, such as:
  • stakeholders alignment
  • contractual / fiscal frameworks
  • financing
developing new resources acid and very acid gases
Developing new resources:acid and very acid gases
  • IOC are facing increasing technological challenges to access and develop new gas resources:
  • High CO2 content (> 30% Asia), high H2S content (Middle-East and Russia)
  • Specific management of H2S and CO2 takes a growing part in atmospheric emissions problematic
  • Total is a world leader in valorization of H2S - sulfur (Lacq since 1957)
  • Total is highly involved in H2S & CO2 re-injection issues

Focus on long term integrity of storage reservoirs

beyond gas flaring reduction a concern of ghg emissions
Venting

Fuel Gas

Flaring

2005

2006

2007

2008

2009

2010

2011

2012

2013

2014

2015

2016

Beyond gas flaring reduction…A concern of GHG emissions
  • 2 main drivers:
    • Increase share of non conventional resources (arctic, heavy oils, tight gas, deep water) but also of mature fields lead to more energy consumption
    • Flaring reduction investments since late ’90’s
  • Fuel gas GHG emission will overcome flaring emissions as from 2010.
  • Total has launched programs of:
  • energy efficiency optimization
  • CO2 capture and storage
beyond gas flaring reduction total e p involved in co2 capture and storage the lacq pilot
Beyond gas flaring reduction: Total E&P involved in CO2 Capture and Storage – The Lacq pilot

CO2

CO2

CO2

CO2

TRANSPORT

TRANSPORT

CO2 STORAGE

CO2 STORAGE

CAPTURE

CAPTURE

AND INJECTION

AND INJECTION

  • A Full Demonstration project :
    • 30 MW Oxy Boiler at Lacq plant
    • Transportation and injection of CO2
    • First CO2 storage in an onshore
    • depleted reservoir in Europe
    • Start up end 2008
  • Oxycombustion for CO2 capture :
    • Cost attractive and energy efficient solution
    • for CO2 capture on steam boilers
    • Reduce by 50% the direct and undirect
    • emissions associated to EHO hot production
  • Dedicated R&D program :
    • CO2 and acid gas injection
    • Storage and well integrity
    • Long tem fate of CO2
    • Monitoring

Oil

Water

HC gas

CO2 or acid gas

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