ABSTRACT
A series of double-chain anionic surfactants, 1,3-dialkyl glyceryl ether hydroxylpropyl sulfonates (diCmGE-HS, m = 8, 10, 12), were synthesized from renewable materials. These surfactants possess very low γcmc (∼25 mN/m) at 25°C, and their mixtures with conventional surfactants can reduce Daqing crude oil/connate water IFT to ultralow at 45°C in wide total concentration range (0.625-10 mM) in the presence of 0.5 wt.% Na2CO3. It seems that diC12GE-HS behaves as a hydrophobic component, whereas diC10GE-HS and diC8GE-HS behave as hydrophilic components in these mixtures. The mixtures also exhibit high resistance against adsorption by sandstone and good ability of keeping sandstone surface water-wet.
GRAPHICAL ABSTRACT
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Acknowledgements
The authors thank the Laboratory of Oil Recovery, Institute of Petroleum Exploring and Development of Daqing, China, for providing financial support as well as crude oil, connate water, PAM and sandstone samples.