CO2/N2开关型泡沫钻井液用起泡剂的合成及应用

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C O 2/N 2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。%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 andN,N-dimethylacetamide,and was characterized by means of FTIR and1H 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,whenx(DMAAB-12) 0.4%,the foaming volume and foam half-life reached 514 mL and 523 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.