In this study, Nano clay suspo-emulsions rheologically characterized for the application in enhanced oil recovery. The impact of Bentonite Nano clay particles on the rheological properties of paraffin oil-water emulsion prepared using CTAB (a cationic surfactant) and DOSS (anionic surfactant), commonly used in petroleum and industrial applications as emulsifiers were investigated.
Surface tension and Rheological measurements of the two surfactants were determined using concentrations ranging from 10−6 moles/liter to 10−1moles/liter (concentrations above and below the critical micelle concentration).
The bulk rheological behavior of emulsions was characterized without and with the addition of Bentonite Nano clay particles through rheological measurements. The emulsions were tested with varying concentrations of CTAB and DOSS ranging from 10−6 moles/liter to 10 −1 moles/liter. These bulk rheology tests included shear rate sweeps and oscillatory tests to determine the viscosity, yield stress, critical stress, storage, and loss modulus. For these rheological tests, the oil-water ratio was varied ranging from 10% v/v to 90% v/v to determine how these results might differ in different emulsion systems. The rheological result for 10/90 % v/v emulsion, prepared with CTAB and DOSS (with and without the addition of Bentonite Nano clay particles) was analyzed. The addition of Bentonite Nano clay led to an increase in the storage and loss modulus of the emulsions.
Interfacial shear rheology tests were further carried out in two runs to determine the strength and mechanical properties of the film at the oil-water interface. By varying concentrations of CTAB and DOSS from 10−6 moles/liter to 10−1moles/liter in the first run and adding Bentonite Nano clay in the second run, interfacial viscosity measured at four different temperatures and the interfacial storage modulus measured at room temperature was obtained. A zero-loss modulus was recorded for each run confirming that the oil-water interface is more elastic (solid-like).
|Commitee:||Chirdon, William M., Depan, Dillip, Gallo, August A., Owuor, Elizabeth A.|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 57/05M(E), Masters Abstracts International|
|Keywords:||Bentonite, Clay, Emulsions, Hydrophilic, Nano, Oil, Recovery, Rheological, Surfactant, Water|
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