Study On The Lowering Interfacial Tension Capability Of Heavy Alkylbenzene Sulfonates

Alkali-surfactant-polymer(ASP) flooding is a new method of Enhanced Oil Recovery(EOR) whichwas developed based on mono-system flooding (polymer flooding, alkali flooding, surfactant flooding) andbinary system flooding(micelle-polymer flooding and alkali-surfactant flooding). After dozens of years oflaboratory study and pilot test, the experimental result shows the ASP flooding can increase recovery 20%more than water flooding and can be used widely. Heavy alkyl benzene sulfonates as surfactant playan important role in ASP flooding.The raw material for preparation of heavy alkyl benzene sulfonates is heavy alkyl benzene which isthe by-product of distillation of dodecylbenzene. It takes heavy alkyl benzene as source material tosynthesize alkyl benzene sulfonic acid through SO₃ falling film sulfurization technique and neutralizationand reallocation.But the properties of the heavy alkyl benzene sulfonates prepared was unstable, so throughthe compounding of heavy alkyl benzene sulfonate with other surfactants is a effective way to improve theHABS properties.In this paper, the combinational systems of heavy alkyl benzene sulfonates with petroleumcarboxylates, biosurfactants, amphoteric surfactants and branched alkylbenzene sulfonates were studiedrespectively, and the results were discussed in detail.