Stability and adsorption of multiphase foam system with high temperature resistance

The multiphase foam system with high temperature resistance mainly consisted of the foaming agent (0.3% disodium monoester succinate (DMS)) and the foam stabilizer (0.2% PS4 and 0.5% hydrophilic SiO2). The synergy between polysaccharide (PS4) and SiO2 was determined by the foam composite index (Fc), which remained at a higher level after aging for 30 days at 115 degrees C. Macro and micro structure of foam in the presence or absence of SiO2 was observed with the naked eye and a scanning electron microscope (SEM), respectively; the result confirmed that SiO2 could adsorb on a liquid film. In addition, the effects of crude oil components and pressure on foam properties were investigated; the latter was monitored by a visualized reactor, and the results showed that asphaltene and high pressure boosted foam while it was opposite to aromatic hydrocarbon. Moreover, the static and dynamic adsorption of DMS under different conditions were determined, and the results could be concluded that besides external factors, PS4 could reduce the adsorption of DMS effectively. [GRAPHICS] .