adsorption and surfactant transport in porous media shunhua liu george j. hirasaki clarence a....
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Adsorption and Surfactant Transport in Porous Media
Shunhua Liu
George J. Hirasaki
Clarence A. Miller
06.04.2005
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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
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Adsorption of Anionic Surfactant (CS330+TDA-4PO 1:1 Blend) with Different Potential Determining Ions on DOLOMITE Powder
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Zeta Potential at Interfaces
-80
-60
-40
-20
0
20
40
0 2 4 6 8 10 12
pH
Ze
ta P
ote
nti
al,
mv
MY1/Brine Calcite/Brine Calcite/Na2CO3/NaHCO3
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0.0
0.2
0.4
0.6
0.8
1.0
1.2
0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14
Residual Surfactant Concentration(Wt%)
Ad
so
rpti
on
De
ns
ity
(mg
/m2 )
Anionic surfactant on dolomite without alkali, plateau=83 Å2/molecule
Anionic surfactantwith Na2CO3(0.2M,0.3M,0.4M)
plateau = 830 Å2/molecule
Nonionic surfactant on dolomite
plateau=714 Å2/molecule
Comparisons of Anionic Surfactant (CS330+TDA-4PO 1:1) and Nonionic Surfactant (Nonylphenol-12EO-3PO) Adsorption on DOLOMITE Powder
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0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0.00 0.02 0.04 0.06 0.08 0.10 0.12
Residual Surfactant Concentration(Wt%)
Ad
so
rpti
on
De
ns
ity
(mg
/m2 )
Nonionic surfactant on silica
CS330 on silica
5000 Å2/molecule
Plateau
184 Å2/molecule.
Comparisons of Anionic Surfactant (CS330) and Nonionic Surfactant (Nonylphenol-12EO-3PO) Adsorption on SILICA Powder
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Absorption Threshold Measurement for Na2CO3
0.000
0.005
0.010
0.015
0.020
0.025
0.030
0.035
0 0.1 0.2 0.3 0.4 0.5 0.6
%Na2CO3
Resid
ual S
urf
acta
nt C
on
cen
tratio
n (%
)
0
0.05
0.1
0.15
0.2
0.25
0.3 A
dso
rptio
n d
en
sity
(mg
/m2)
Same Initial surfactant concentration 0.05%
Same Solid Liquid Ratio(10:1)
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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
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Background for two surfactants system
Two Surfactants
Natural Soap (Naphthenic Acid+Alkali)
•A hydrophobic surfactant
•Initial condition for our system
Synthetic surfactant
•A hydrophilic surfactant
•Boundary condition for our system
Partition Coefficient =Concentration in oleic phase
Concentration in aqueous phase
e.g. 31
323cc
KC
41
424cc
KC
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
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The effect of two surfactants
Optimal Salinity vs. Soap-Synthetic Surfactant Ratio Curve
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Contour of IFT (log10(IFT))
10-1
10-2
10-3
Type II Region
Type I Region
Type III Region
(%N
aCl)
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Residual Phase Saturation Curve
Ref:L. W. LakeEnhanced Oil Recovery Prentice-Hall, New Jersey,1989
Capillary Number Nc
u
Nc IFT=10-3IFT=10-2
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Contour of Partition Coefficient (log10(K))
K>>1
K<<1
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Adsorption of Synthetic Surfactant
Langmuir type isotherm
0
0.2
0.4
0.6
0.8
1
1.2
0 5 10 15 20c31
C3ads
K
Cmax
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Base Case Parameters
Sor=0.3 Oil Viscosity: 8cp
Formation brine:4.8%NaCl Soap Concentration: c42=510-4, 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
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Base Case Effluent History
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Base Case Surfactants’ Profiles
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Base Case IFT and Soap Surfactant Ratio Profiles
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Base Case Oil Profiles
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Parameter Study (Salinity)
Recovery vs Salinity
0%
20%
40%
60%
80%
100%
0 2 4 6Salinity(%)
Re
co
ve
ry
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Parameter Study (Salinity)
Base Case (Salinity=4.8%)
At t=0.5PV
Salinity=1.0%
Salinity=5.5%
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Parameter Study (Aqueous phase viscosity)
Recovery vs Aqueous phase viscosity
0%
20%
40%
60%
80%
100%
0 5 10 15 20 25Aqueous phase viscosity(cp)
Oil R
ec
ove
ry
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Parameter Study (Aqueous phase viscosity)
Base Case (Viscosity=15cp)At t=0.5PV
(Viscosity=1cp)
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Parameter Study (NX)
Recovery vs NX
0%
20%
40%
60%
80%
100%
0 50 100 150 200NX
Re
co
ve
ry
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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.
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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.