Abstract
Polymer oil recovery technology has been widely applied, but the resultant increased polymer-containing oil sludge are facing with treatment difficulties. Internal interactions of oil sludge that contained hydrolyzed polyacrylamide (HPAM) have been not well understood. This study established specific emulsion systems to examine contributions of asphaltenes, soil particles, and HPAM to stabilization of polymer-containing oil sludge. According to emulsification index, emulsion droplet sizes, and emulsion shear rheology analysis, the results show that asphaltenes and soil particles have synergistic effect in stabilizing emulsions. The emulsion with soil particles and asphaltenes exhibited strongest stability, more stable than the emulsion with three-phase components. The surface adsorption of asphaltenes on soil particles enhanced lipophilicity of soil particles. But emulsion stability was weakened due to the flocculation of particles by HPAM. The concentration effect tests prove that high concentrations of soil particles (100–1000 g/L) and asphaltenes (100–300 ppm) can enhance emulsion stability, but HPAM has non-monotonic concentration effect. In addition, strongest emulsion stability was observed at neutral pH. Smaller soil particle size tended to cause high strength emulsion interfacial film forming. These findings benefit the development of “targeted” treatment technologies for polymer-containing oil sludge.
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