Mohamed Keddam

September 2011

CO2 geological sequestration

In Salah Gas

Algeria

Project location Hassi Messaoud

Gour Mahmoud

Hassi R’Mel

Hassi

Moumene

Krechba

Teg

Reg

Garet el

BefinatIn Salah

14

3

3

10

10

12

30”/37 km

24”/62 km

32”/36 km

24”/13 km

32”/83 km

21

38”/60 km

32”/39 km

CNDG38”/5 km

Compression

Station

Phase 1:

Drilling of 25 wells

- 22 producers

- 3 injectors

Construction of 3 CPF

Compression Station at Hassi R’Mel

A 48” Pipeline, 460 km long

CNDG

Hassi R’Mel

Krechba

Teguentour

Reg

Reserves: 24 BCM

CO2: 1%

173 bars / 102C

Reserves: 21.4 BCM

CO2: 9.1%

325 bars / 144C

Reserves: 76.5 BCM

CO2: 8.6%

290 bars / 149C

Reserves: 45.4 BCM

CO2: 3.8%

178 bars / 108C

Phase 1

Carb.

Dev.

Key elements

Start of the Project, phase 1 November 2001

First gas July 2004

Plateau 9 BCM / year

Duration of the plateau 14 years

Duration of the Contract 30 years

Compression start up As from 2010

A multi-phase Project, of multiples fields

Investment phase 1 1.7 billion dollars

Reserves in place 340 BCM

Recoverable Reserves 232 BCM

Investment for Compression 0.8 Billion dollars

Southern Fields Production As from 2012

Estimated investment for Southern Fields 2.3 billion dollars

Total number of wells for the two phases 73

0.42

0.35

0.21

0.14

0.07

0.00

0.28

Pro

du

cti

on

(B

CM

)

12

10

6

4

2

0

8

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Year

(tcf)

Production profiles

Compression

CO2 extrait du gaz

Autre CO2

0

200,000

400,000

600,000

800,000

1,000,000

1,200,000

1,400,000

1,600,000

1,800,000

Year

CO2 produced by source

Year

CO2 extracted from gas

sequestrated

• 0,7 billion of m3 per year of CO2 re-injected

• 60% reduction of greenhouse effect gas

• 20 Million tons of CO2 re-injected through out the

life of the project

• Analogies• Equivalent of 200 000 cars running 30 000 km / year

• 200 km2 forest equivalent

• Re-injection Capex: 100 Million

• Estimated Re-injection Opex: 10 Million/year

Some Figures

SEQUESTRATION OPTIONS

• Site choice criteria• Integrity and tightness of the reservoirs

• Sufficient storage capacity

• Good porosity

• Moderate Pressure

• Carboniferous Reservoir at Krechba• Tight reservoir and high storage capacity

• Availability of seismic data.

• Existence of exploration and evaluation wells

• A unique facility of CO2 extraction

Krechba

Inter-field

pipelines To amine regeneration

Glycol

regeneration

Glycol Contactor

CO2

AbsorberFuture

Compression

Train 2

Water contentCO2 content

Pigging

PipelineTo R'Mel

Gas

preheating

Stripper

Pigging trap FuelGas

CO2 extraction

and dehydration

Amine regeneration

CO2 to re-injection

Wells location

CO2 injection pattern

Carboniferous Reservoir

~20 metres thick

Carboniferous Mudstones

~950 metres thick

Cretaceous Sandstones &

Mudstones ~900 metres

thick (Regional Aquifer) 4 Gas

Production

Wells

3 CO2

Injection

Wells

Processing Facilities

Amine CO2

Removal

The CO2 Storage Scheme

at Krechba

Carboniferous Reservoir

~20 metres thick

4 Gas

Production

Wells

3 CO2

Injection

Wells

Processing Facilities

Amine CO2

Removal

Carboniferous Reservoir

~20 metres thick

4 Gas

Production

Wells

3 CO2

Injection

Wells

Processing Facilities

Amine CO2

Removal

Carboniferous reservoir

~20 meters

Production

wells Injection

wells

Amine CO2

Removal

CO2 compression system

parameters

CO2 Extraction from produced gas (average content 7%) using

Amine

Extracted CO2 is sent to the re-injection system

2 compressors disposed in parallel are used for the compression

of the whole extracted CO2

– Suction Pressure : 0,15 to 0,30 bars

– Discharge Pressure : 150 to 200 bars

– 4 stages of compression

– All the casings and impellers are made of stainless steel

CO2 Compression

Glycol

contactor

QR

Dew point

Glycol

regeneration

ASCASCASC

ASC

M

From

Train 2

To Train 2

To venting drum

PC

PC

Stage 4

From

de-carbonation

To CO2

Injection

wells

Stage 3Stage 2Stage 1

5 ans 15 ans

Simulation of CO2 migration

• Injection pressure limited to 160 bars in order to avoid any

risk of fracturing the reservoir

• Low absorption at the start of the project. Stimulation

required

Reservoir challenges

The experience of CO2 sequestration introduced by In Salah

Gas Project showed that:

• The solution is technically feasible

• Is Economically acceptable

• The monitoring and satellite pictures show that the CO2

evolves in accordance with predictions and simulations

• Geologically, the solution is viable

• Could be generalized, provided that there be a receiving

reservoir

Conclusion