8/12/2019 G2 R3 Co2 Properties

1/16

GROUP 2

Properties of CO2

3rdPEER TEACHING

8/12/2019 G2 R3 Co2 Properties

2/16

Carbon Dioxide Properties

8/12/2019 G2 R3 Co2 Properties

3/16

Advantages CO2 in EOR

Reduces oil viscosity

Swelling of oil

High solubility in water

Reduces IFT

Immiscible flooding occurs if below MMP,

forming multiple phase solution

Miscible flooding occurs if above MMP, forming

single phase solution

8/12/2019 G2 R3 Co2 Properties

4/16

Disadvantages of CO2 Flooding

1. Severe gas channeling due to high gas mobility

Gas channeling causes most of the oil reservoir to be bypassed as oil is left

behind

2. CO2 is expensive to transport and not always available Special handling of produced gas

3. Carbon dioxide and water forms carbonic acid which is corrosive

4. Free CO2 with low viscosity would promote early BT to producing

well

8/12/2019 G2 R3 Co2 Properties

5/16

Sensitivity to Oil Properties

Oil recovery decreases with increasing:

Oil density

Oil viscosity

Formation volume factor

8/12/2019 G2 R3 Co2 Properties

6/16

(Nasir & Amiruddin)

8/12/2019 G2 R3 Co2 Properties

7/16

Viscosity

Viscosity affects the mobility ratio of the fluid

M1 poor

=

(2)

() =

=

.

=

8/12/2019 G2 R3 Co2 Properties

8/16

Density

Density is closely related to viscosity

Effect of gravity segregation (density differencebetween oil and injected gas.

Higher oil density, density difference would be

greater, gravity segregation is more severeRF expected to decrease

8/12/2019 G2 R3 Co2 Properties

9/16

Oil formation volume factor

=

Amount of injected gas is insufficient to mobilize

the oil

8/12/2019 G2 R3 Co2 Properties

10/16

Sensitivity to CO2 Properties

Oil recovery decreases with increasing:

Oil density

Oil viscosity

Formation volume factor

8/12/2019 G2 R3 Co2 Properties

11/16

(Nasir & Amiruddin)

8/12/2019 G2 R3 Co2 Properties

12/16

Viscosity

= (2)

() =

=

.

=

8/12/2019 G2 R3 Co2 Properties

13/16

Density

Density is closely related to viscosity

Changes the mobility ratioDensity increase, RF increase

8/12/2019 G2 R3 Co2 Properties

14/16

Gas formation volume factor

=

, greater gas expansion in reservoir,

causing increases in gas volume to be miscible

with oil, oil viscosity reduce, RF increase.

8/12/2019 G2 R3 Co2 Properties

15/16

Conclusion

Most sensitive property is the FVF

By changing 1% of each properties (Nasir &

Amiruddin)Properties Average Fractional

change (%)

Recovery factor

Oil density 6.6

Oil viscosity 1.9

Oil FVF 20Gas density 9

Gas viscosity 5.6

Gas FVF 9.6

8/12/2019 G2 R3 Co2 Properties

16/16

REFERENCES

Nasir, F. M., & Amiruddin, N. A. Miscible CO2 Injection: Sensitivity to Fluid

Properties.

Universal Industrial Gases, Carbon Dioxide (CO2) Properties, Uses, Applications

CO2Gas and Liquid Carbon Dioxide, retrieved from

http://www.uigi.com/carbondioxide.html