甜菜碱/AOS/Gemini季铵盐三元复合型泡排剂的研制与性能评价

doi:10.3969/j.issn.2097-2806.2024.03.001

摘要/Abstract

摘要：

泡沫排液技术是保障气井产量的重要手段，研发高性能的泡排剂极其关键。为适应高矿化度、高凝析油含量及高温等苛刻气井环境，以椰油酰胺丙基羟基磺基甜菜碱（CHSB）作为主剂，α-烯基磺酸钠（AOS）和合成的Gemini阳离子表面活性剂CAGB作为辅剂制备了一种高效环保的三元泡排体系。结果表明，三元复配体系AOS/CAGB/CHSB在摩尔比为12∶3∶35、总量为20 mmol/L时性能最优，泡沫体积和半衰期分别达到360 mL和30.27 min；在含有30%甲醇的泡排剂溶液中，测得的携液率最高可达31%，发泡率为95%；在含有0%~50%凝析油的泡排剂溶液中，三元泡沫体系表现出良好的性能，其中在凝析油含量为20%时，测得的携液率最高可达38%，发泡率为95%；优选的三元复配体系AOS/CAGB/CHSB对盐离子耐受性较差，加入螯合剂（氨三乙酸三钠（NTA））后，三元复配体系在矿化度为150 g/L的溶液中仍能稳定发泡和携液；温度大于50 ℃时，泡沫的携液率也逐渐增加，温度在90 ℃时，携液率在95%以上。此外，通过表面张力测试、泡沫微观结构观察也证实了该泡排剂体系存在的协同效应使其起泡、稳泡和泡沫携液能力得到有效提升。

关键词: 气井排水采气, 甜菜碱型表面活性剂, Gemini表面活性剂, 发泡性能, 携液率

Abstract:

Foam-based deliquification is important to ensure the production of gas wells, therefore, there is no doubt that the development of high-performance foaming agents is extremely critical for the gas wells with high salinity, high condensate oil content and high temperature. For this reason, a highly efficient and environmentally friendly ternary foaming mixture was prepared by coconut oil amide propyl hydroxy sulfobetaine （CHSB）, sodium α-olefin sulfonate （AOS） and synthetic Gemini cationic surfactant （CAGB） in this study. The results showed that the AOS/CAGB/CHSB mixture had the best performance when the molar ratio was 12∶3∶35 at the total amount of 20 mmol/L. The foam volume and half-life reached 360 mL and 30.27 min, respectively. In the foaming agent solution containing 30% methanol, the measured liquid unloading efficiency was 31%, and the foaming efficiency was 95%. With 0%-50% condensate oil, the ternary foaming mixture showed good performance. With 20% condensate oil, the liquid unloading efficiency was up to 38% and the foaming efficiency was 95%. The optimized AOS/CAGB/CHSB exhibited poor tolerance to salt ions. However, with trisodium aminotriacetate （NTA）, the ternary complex system was still effective at a salinity of 150 g/L. At temperatures higher than 50 ℃, the liquid unloading efficiency of the foam also gradually increased, and the liquid unloading efficiency was above 95% at 90 ℃. In addition, the surface tension test and foam microstructure observation also confirmed the presence of synergy in foaming, foam stabilization and foam liquid unloading.

Key words: gas well deliquification for gas recovery, betaine surfactant, Gemini surfactant, foaming performance, liquid unloading efficiency

中图分类号:

TQ423

张志升, 沈产量, 李建勋, 刘延强, 韩薇薇, 董三宝. 甜菜碱/AOS/Gemini季铵盐三元复合型泡排剂的研制与性能评价[J]. 日用化学工业（中英文）, 2024, 54(3): 239-249.

Zhisheng Zhang, Chanliang Shen, Jianxun Li, Yanqiang Liu, Weiwei Han, Sanbao Dong. Preparation and performance of betaine/AOS/Gemini ternary surfactant foam for gas well deliquification[J]. China Surfactant Detergent & Cosmetics, 2024, 54(3): 239-249.

图/表 11

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