Abstract
Considering the problems of scaling and emulsification in alkaline-surfactant-polymer (ASP) flooding, surfactant-polymer (SP) flooding was proposed for enhancing heavy oil recovery in China. However, it is difficult to reduce the IFT to an ultra-low value without alkali for the traditional chemical system. In this paper, betaine was selected as a surfactant in SP system for it's excellent ability of reducing oil/water interfacial tension (IFT) at low concentrations, it showed that the IFT reduced to 0.001 mN/m or less at a surfactant concentration range of 100 mg/L to 1000 mg/L. Alkali lignin with low-price was compounded as a sacrificial agent to reduce the adsorption, the experimental results showed that the adsorption of betaine surfactant reduced approximately 40% when the mass-ratio of alkali lignin and betaine was 1 to 7.5. Sandpack flooding tests indicated that the injected chemical system containing polymer, betaine and alkali lignin after water flooding could enhance oil recovery by 13% ∼ 20%, wh...
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