高温高盐水中月桂酰胺丙基羟磺基甜菜碱在砂岩表面吸附规律研究OACSTPCD

Lauramide propyl hydroxy sulfobetaine surfactant has good foaming performance in high salt water,but the adsorption capaci-ty of it on the surface of sandstone is not clear.The ratio of methanol to water,the flowing velocity of mobile phase and the column tem-perature were optimized using Shim-pack VP-ODS 4.6 mm × 250 mm column and an ultraviolet detector,and the high performance liq-uid chromatography for determination of lauramide propyl hydroxy sulfobetaine content in high saltwater was established.The adsorption evaluation shows that in the water with the temperature of 110 ℃,NaCl of 25 × 104 mg/L and lauramide propyl hydroxy sulfobetaine of less than 1％,the adsorption capacity of lauramide propyl hydroxy sulfobetaine on the surface of 80～100 mesh quartz sand is less than 2 mg/g.In the water with the temperature of 110 ℃,NaCl of(20～25)× 104 mg/L and lauramide propyl hydroxy sulfobetaine of 0.4％,the adsorption capacity of lauramide propyl hydroxy sulfobetaine on the surface of 80～100 mesh quartz sand increases with the increase of NaCl mass concentration.In the water with the temperature of 110 ℃,NaCl of 22.5 × 104 mg/L,CaCl2 of(0～3)× 104 mg/L and lauramide propyl hydroxy sulfobetaine of 0.4％,the adsorption capacity of lauramide propyl hydroxy sulfobetaine on the surface of 80～100 mesh quartz sand decreases with the increase of CaCl2 mass concentration.The research results have a guiding significance for the selection and application of betaine surfactants under high-temperature and high-salinity conditions.