阴离子型表面活性剂/叔胺复配泡沫的性质及CO₂/N₂响应性能

Foam Property and CO₂/N₂ Response Performance of Anionic Surfactant/Tertiary Amine Compound Foam

刘冬梅 曾文广 杨康 石鑫 魏晓静 张腾方 孙霜青

LIU Dongmei ZENGWenguang YANG Kang SHI Xin WEI Xiaojing ZHANG Tengfang SUN Shuangqing

泡沫排水采气工艺中，泡沫到达地表后难以实现可控的消泡。为获得兼具稳定性及响应性的泡排体系，并明确在无机盐和油相环境下的适用性，将十二烷基硫酸钠（SLS）、十二烷基磺酸钠（SDS）和十二烷基苯磺酸钠（SDBS）分别与N-十二烷基-N，N-二甲基叔胺（C12A）复配，研究了复配溶液的泡沫性能及无机盐和油相对复配体系的影响。针对泡沫性能较好的SLS/C12A和SDS/C12A复配体系进行了CO2响应消泡以及N2加热重新起泡实验，分析了复配泡沫的响应机理。结果表明，SLS/C12A复配体系的泡沫性能最好，SDBS/C12A的泡沫稳定性最差。SLS/C12A复配体系的耐盐能力强，SDS/C12A复配体系的抗油效果显著。两种复配体系均表现出较好的响应性和可逆性。通过消泡后溶液形态和表面张力的变化分析响应机理为：质子化的C12A与表面活性剂静电吸引形成络合物，从溶液中析出，降低了溶液的表面活性，加速了泡沫的破碎。这对于不同环境油气田的表面活性剂体系选择具有一定的指导意义。

In the foam drainage and gas recovery process，it is difficult to achieve controllable defoaming after the foam reaches earth surface. In order to obtain a foam discharge system with both stability and responsiveness，and clarify the applicability in inorganic salt and oil phase environments，sodium dodecyl sulfate（SLS），sodium dodecyl sulfate（SDS）and sodium dodecyl benzene sulfonate（SDBS）were compounded with N-dodecyl-N，N-dimethyl tertiary amine（C12A），respectively. The foam property of the compound solution and the effect of inorganic salt and oil on the compound system were studied. For the SLS/C12A and SDS/ C12A compound systems with better foam property，CO2 response defoaming and N2 heating re-foaming experiments were carried out，and the response mechanism of the compound foam was analyzed. The results showed that the foam property of SLS/C12A compound system was the best，and the foam stability of SDBS/C12A was the worst. SLS/C12A compound system had strong salt tolerance，and SDS/C12A compound system had significant oil resistance. Both compound systems showed good responsiveness and reversibility. The response mechanism was analyzed by the change of solution morphology and surface tension after defoaming. The protonated C12A electrostatically attracted surfactant to form a complex，which precipitated from the solution. The surface activity of the solution was reduced and the breakage of the foam was accelerated. It had certain guiding significance for the selection of surfactant system in oil and gas fields with different environments.

10.19346/j.cnki.1000-4092.2022.02.024