Effect of Gemini surfactants on self-thickening acids: size and morphological changes in micelles

The micelle behavior between surfactants and hydrophobic associative polymers solves the problem of temperature resistance of self-thickening acids. Gemini betaine 2C 12 -SGS is synthesized from N-[3-(dimethylamino)propyl] lauramide, sodium 3-chloro-2-hydroxy-propanesulfonate, and 1,4-dibromobutane. When Gemini Betaine 2C 12 -SGS was added to the ADOM acid solution, the residual viscosity of the residual acid solution was 103 and 55.67 mPa·s after shearing for 1   h at 150 °C and 180 °C, respectively, which increased by 41.64 and 32.74 mPa·s, respectively, and increased by 67.86% and 142.78%, respectively, compared with those without surfactant. The interaction between surfactants and self-thickening acids provides theoretical support for their composite system to serve as an acidizing fluid for high-temperature carbonate reservoirs.