Synergistic effect of lactam, ammonium and hydroxyl ammonium based ionic liquids with and without NaCl on the surface phenomena of crude oil/water system

Enhanced heavy oil recovery using 1‐Ethyl‐3‐Methyl‐Imidazolium Acetate

“…Furthermore, a slight reduction was noticed when 1000 to 4000 ppm of [EMIM][Ac] were added. As previously observed, the reduction in the SFT of water‐IL ([CP] + [C6H16COO]) increased with higher concentration . However, the measurements of SFT became stable as concentration increased above 4000 ppm.…”

Imidazolium based ionic liquid stabilized foams for conformance control: bulk and porous scale investigation

“…Though the differences are minor, it is obvious that higher the hydrophobicity of the ILs better the efficacy in balancing its interaction more appropriately in between air-liquid interface. 34,43,45 A similar trend of foam stability was observed for all type of surfactants. However, the surfactant of FS-31 had shown relatively better efficiency than the other two surfactants.…”

“…Though it is a very marginal effect, it is to be considered as a synergism. 43 As a result of this, the surface activity of the surfactant + ILs mixture tends to be increased slightly by exposing more contact area of the liquid phase with the gas phase. 40 Overall, the lengthier chain ILs works more efficiently on the reduction of surface tension.…”

“…Similar observations were also witnessed in our previous studies. 34,43,44 As seen in Fig. 4, that the shorter chain IL, [C 4 mim] + [Cl] À experiences the CMC at around 255 ppm, whereas in the case of the longer chain containing IL, [C 12 mim] + [Cl] À , it was reduced as 110 ppm.…”

Preparation and structural analysis of a comb‐like polymer through functional monomer design

“…[ 1–5 ] The application of polymer as an important chemical product has been continuously increasing during the last decades. [ 2,6–11 ] During the polymer flooding process, a series of water‐soluble polymers, such as polyacrylamide or its derivatives, [ 12–15 ] are used to thicken the displacing fluid to extend swept volume, reduce the mobility of the aqueous phase, and accordingly enhance oil production. Furthermore, the adsorption of polymer in the porous media formation reduces the permeability to water, and polymer viscoelasticity is able to enlarge the microscopic sweep efficiency improvement.…”