Abstract
In order to solve the problem of foam instability in foam drainage gas recovery technology, a nanosheets-stabilized foam drainage agent was constructed. The synergistic effect of anionic foaming agent AOS and amphoteric betaine foaming agent CHSB were studied by measuring the foam properties and surface tension of the two foaming agents. The results showed that the foaming agent system with enhanced foam performance was obtained when the mass ratio of CHSB to AOS was 3:1, with a minimum surface tension γ of 24.3 mN/m, a foaming volume V0 of 510 mL and a half-life t1/2 of 12.03 min. To further improve the foam stability, nanosheet foam stabilizers were obtained by hydrophobic modification of g-C3N4 nanosheets, and their structures were characterized by XRD, XPS, FT-IR and contact angle. The nanofoam drainage agent was constructed by adding g-C3N4 nanosheets to the foaming system, and the half-life t1/2 reached 27.66 min. The microstructure of the foam was observed by optical microscopy to reveal the foam stabilization mechanism. The system evaluation results show that the foam drainage agent has good resistance to salt, temperature, condensate oil, and liquid carrying properties.
Published Version
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