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Adsorption and Surfactant Transport in Porous Media. Shunhua Liu George J. Hirasaki Clarence A. Miller 06.04.2005. Outline. Surfactant Adsorption Test the effect of different potential determining ions Test the nonionic surfactant Test the new surfactant ( N67-7PO: IOS=4:1)

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slide1

Adsorption and Surfactant Transport in Porous Media

Shunhua Liu

George J. Hirasaki

Clarence A. Miller

06.04.2005

slide2

Outline

  • Surfactant Adsorption
    • Test the effect of different potential determining ions
    • Test the nonionic surfactant
    • Test the new surfactant (N67-7PO: IOS=4:1)
  • The transportation of two surfactants in porous media
    • Background
    • Propagation of the two surfactants
slide3

Adsorption of Anionic Surfactant (CS330+TDA-4PO 1:1 Blend) with Different Potential Determining Ions on DOLOMITE Powder

slide4

40

20

0

-20

Zeta Potential, mv

-40

-60

-80

0

2

4

6

8

10

12

pH

MY1/Brine

Calcite/Brine

Calcite/Na2CO3/NaHCO3

Zeta Potential at Interfaces

slide5

Comparisons of Anionic Surfactant (CS330+TDA-4PO 1:1) and Nonionic Surfactant (Nonylphenol-12EO-3PO) Adsorption on DOLOMITE Powder

slide6

Comparisons of Anionic Surfactant (CS330) and Nonionic Surfactant (Nonylphenol-12EO-3PO) Adsorption on SILICA Powder

slide7

Absorption Threshold Measurement for Na2CO3

Same Initial surfactant concentration 0.05%

Same Solid Liquid Ratio(10:1)

slide8

Outline

  • Surfactant Adsorption
    • Test the effect of different potential determining ions
    • Test the nonionic surfactant
    • Test the new surfactant (N67-7PO: IOS=4:1)
  • The transportation of two surfactants in porous media
    • Background
    • Propagation of the two surfactants
slide9

Background for two surfactants system

Concentration in oleic phase

Partition Coefficient =

Concentration in aqueous phase

  • Natural Soap (Naphthenic Acid+Alkali)
    • A hydrophobic surfactant
    • Initial condition for our system

Two Surfactants

  • Synthetic surfactant
    • A hydrophilic surfactant
    • Boundary condition for our system

where KCi is the partition coefficient of i component

ci1 is the concentration in aqueous phase

ci2 is the concentration in oleic phase

i=3 for synthetic surfactant; i=4 for natural soap

e.g.

slide10

The effect of two surfactants

Optimal Salinity vs. Soap-Synthetic Surfactant Ratio Curve

slide11

Type II Region

(%NaCl)

Type III Region

Type I Region

10-1

10-2

10-3

Contour of IFT (log10(IFT))

slide12

Residual Phase Saturation Curve

Capillary Number Nc

IFT=10-2

IFT=10-3

Ref:

L. W. Lake

Enhanced Oil Recovery

Prentice-Hall, New Jersey,1989

slide14

Langmuir type isotherm

1.2

C

max

1

0.8

C3ads

0.6

0.4

K

0.2

0

c31

0

5

10

15

20

Adsorption of Synthetic Surfactant

slide15

Base Case Parameters

Sor=0.3 Oil Viscosity: 8cp

Formation brine:4.8%NaCl Soap Concentration: c42=510-4, C4=1.5 10-4

NX=100

Surfactant Concentration:1 10-3(~0.1%) Slug Size:0.3PV

Aqueous phase viscosity: 15 cp

Keep the salinity fixed

slide21

Parameter Study (Salinity)

Salinity=1.0%

At t=0.5PV

Base Case (Salinity=4.8%)

Salinity=5.5%

slide23

Parameter Study (Aqueous phase viscosity)

At t=0.5PV

Base Case (Viscosity=15cp)

(Viscosity=1cp)

conclusion
Conclusion
  • CO3-2 can be used to reduce the adsorption of anionic surfactant on carbonate formation. The threshold is around 0.08% Na2CO3.
  • When surfactant and natural soap propagate together, we can make the Winsor type II region ahead of the surfactant front and make the type I region behind the front.
  • The low IFT region will increase as the surfactant and soap propagate.
  • By manipulating the operational parameters, We can take advantage of the existence of soap and make the low tension region wide enough for recovering all the oil. The usage of surfactant could be very small.
future work
Future Work
  • Add the polymer term to control the viscosity
  • Add the alkali term to describe the generation of soap
  • Find an economic strategy by using the simulator
  • Flooding experiments for the history match.