【摘要】 以十二胺和N,N-二甲基乙酰胺为主要原料,采用缩醛法合成了一种CO₂/N₂开关型表面活性剂N′-十二烷基-N,N-二甲基乙脒（DMAAB-12）作为泡沫钻井起泡剂。采用FTIR和¹H NMR等方法对DMAAB-12进行了结构表征,并测试了DMAAB-12的泡沫性能及可循环能力。表征结果显示,合成产物的结构与设计相一致。实验结果表明,当x（DMAAB-12）=0.4%时,溶液的发泡体积为514 mL,泡沫半衰期为523 s,表现出良好的泡沫性能;以DMAAB-12为起泡剂在室内可实现泡沫的循环利用,交替通入CO₂/N₂循环10次后,泡沫的发泡体积由753 mL降至561 mL,泡沫半衰期由225 s降至164 s,仍具有较好的泡沫性能,可实现泡沫的循环利用。更多还原

【Abstract】 A switchable CO₂/N₂ foaming agent,N’-dodecyl-N,N-dimethyl acetamidine（DMAAB-12） which could be used in foam drilling fluid,was synthesized through acetalation from dodecylamine and N,N-dimethylacetamide,and was characterized by means of FTIR and ¹H NMR.Its foaming performance and recyclability were investigated.The characterization results showed that the structure of DMAAB-12 was consistent with the design.The experimental results indicated that,when x（DMAAB-12） 0.4%,the foaming volume and foam half-life reached 514 mL and523 s,respectively.DMAAB-12 can be reused indoors.After it was recycled 10 times,the foaming volume and half-life decreased only from 753 mL to 561 mL and from 225 s to 164 s,respectively.更多还原