g2 r3 co2 properties

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    GROUP 2

    Properties of CO2

    3rdPEER TEACHING

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    Carbon Dioxide Properties

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    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

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    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

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    Sensitivity to Oil Properties

    Oil recovery decreases with increasing:

    Oil density

    Oil viscosity

    Formation volume factor

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    (Nasir & Amiruddin)

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    Viscosity

    Viscosity affects the mobility ratio of the fluid

    M1 poor

    =

    (2)

    () =

    =

    .

    =

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    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

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    Oil formation volume factor

    =

    Amount of injected gas is insufficient to mobilize

    the oil

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    Sensitivity to CO2 Properties

    Oil recovery decreases with increasing:

    Oil density

    Oil viscosity

    Formation volume factor

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    (Nasir & Amiruddin)

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    Viscosity

    = (2)

    () =

    =

    .

    =

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    Density

    Density is closely related to viscosity

    Changes the mobility ratioDensity increase, RF increase

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    Gas formation volume factor

    =

    , greater gas expansion in reservoir,

    causing increases in gas volume to be miscible

    with oil, oil viscosity reduce, RF increase.

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    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

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    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