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Chemical Engineering Department. Towards Reducing the Adsorption of Surfactants on Carbonate Minerals. Hadi ShamsiJazeyi, George J. Hirasaki April 2011. Agenda. Introduction Problem Definition Adsorption Methods Results and Discussions Conclusion. Introduction.
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Chemical Engineering Department Towards Reducing the Adsorption of Surfactants on Carbonate Minerals Hadi ShamsiJazeyi, George J. Hirasaki April 2011
Agenda • Introduction • Problem Definition • Adsorption • Methods • Results and Discussions • Conclusion
Why is Surfactant Adsorption important in EOR? • Enhanced Oil Recovery (EOR) • Surfactant Adsorption & EOR • Economy of Surfactant Injection • Chromatographic Separation • Wettability Alteration
NIB Used in Chemical Flooding • Neodol-67 : • IOS15-18 • Lauryl Betaine • Previously used for ASF (Alkaline Surfactant Foam) in our group • Mobility Control + Low Interfacial Tension NIB-Blend
What Caused this Retardation? NIB on Carbonate showed a retardation: CHROMATOGRAPHIC SEPARATION? (ADSORPTION) or DELAY in FOAM FORMATION?
Adsorption of NIB • To evaluate adsorption of NIB We investigate adsorption of NI and adsorption of Betaine, separately. • Why? • Easier to measure the concentration • Effect of NI and B can be determined separately on the adsorption
Our Tested Choices as Sacrificial Agent • Succinic Acid • Propionic Acid • Sodium Poly acrylate
Procedure for Static Adsorption Experiment • Limestone Sand (Mesh 20-40) • 24 h equilibrium time • Measurement using potentiometric titration For NI-Blend: Hyamine 1622 For Betaine: Sodium tetraphenylborate N:I:B=4:1:10
Results & Discussions
Adsorption isotherm of NI-Blend on Limestone Sand 0.15 wt% initial concentration of NI-Blend Different weights = 2,3,4,4.5,6 (g) Room temperature, Limestone Sand (20-40) 24 (h) shaking 3.5 % NaCl, 10 (cc) solution used • Relatively low Adsorption
Sacrificial Agents and Adsorption of Surfactants on Limestone Sand Betaine NI-Blend 0.3 wt% initial concentration of NI-Blend, Room temperature, Limestone Sand (20-40) 24 (h) shaking, 5(cc) NI-Blend + 5(cc) sacrificial agent solution, Simultaneously added, 3.5 wt% NaCl, solid weights = 4 (g). Concentration of sacrificial agents = 0.6 wt% 0.6 wt% initial concentration of Betaine, Room temperature, Limestone Sand (20-40) 24 (h) shaking, 5(cc) NI-Blend + 5(cc) sacrificial agent Simultaneously added. solution, 3.5 wt% NaCl, solid weights = 4 (g). Concentration of sacrificial agents = 1.2 wt%
Conclusions • On Limestone sand: Adsorption of Lauryl Betaine >> Adsorption of NI-Blend • Polyacrylate had the best results comparing to some other materials in reducing adsorption of NI and Betaine on limestone sand
Future Work • Polymeric Sacrificial Agent vs. Same Monomeric ones • Effect of Equilibrating Sacrificial Agent Before Equilibrating Surfactant on Adsorption Reduction • Other Sacrificial Agents • Other Mechanisms of Adsorption • Optimal Concentration of Sacrificial Agents needed • 1D Dynamic Adsorption • How Reducing Adsorption can affect foam mobility in 1D ASF using NIB?