微乳液型油基钻井液冲洗液技术

发布时间：2018-06-19 23:21

  本文选题：油基钻井液 + 微乳液　； 参考：《油田化学》2017年03期

【摘要】：为了高效清除井壁及套管壁上残留的油基钻井液、提高水泥环与环空界面胶结强度,根据表面活性剂盐水溶液与油接触后表面活性剂组装形成油水界面膜包裹油相而原位形成微乳液的原理,以琥珀酸二(2-乙基己酯)磺酸钠(AOT)、异构十三醇聚氧乙烯醚(AEO5-13)的复配体系为主表面活性剂,以柴油或白油为油相制备微乳液,通过考察微乳液增溶参数、界面张力等主要性能指标,确定了微乳液型冲洗液配方:KCl盐水(清洗柴油基钻井液时质量分数为7%,清洗白油基钻井液时质量分数为10%)+4%AOT+3%AEO5-13+6%正丁醇,并评价了该冲洗液的润湿反转能力、冲洗效率及与钻井液和水泥浆的相容性。研究结果表明,随盐度增加,微乳液相态经历Winsor Ⅰ型到Winsor Ⅲ型再到Winsor Ⅱ型的转变,Winsor Ⅲ型微乳液具有最佳的增溶参数和界面活性,形成Winsor Ⅲ型柴油微乳液及白油微乳液的最佳盐度分别为7%和10%。微乳液型冲洗液的润湿反转能力强、冲洗性能优越,7 min对油基钻井液冲洗效率达95%以上,且与钻井液及水泥浆的相容性好。
[Abstract]:In order to efficiently remove the remaining oil based drilling fluid on the wall and casing wall and improve the cementing strength between cement ring and annulus interface, According to the principle that the surfactant is assembled into the oil-water interfacial film after the surfactant is in contact with the oil, the oil phase is encapsulated by the oil-water interfacial film and the microemulsion is formed in situ. The microemulsion was prepared by using the mixed system of sodium dioxy-2-ethylhexyl succinate (AOTO), iso-tridecanol polyoxyethylene ether (AEO5-13) as surfactant, diesel oil or white oil as oil phase. The solubilization parameters of microemulsion were investigated. The main performance indexes such as interfacial tension were determined. The formula of microemulsion type washing fluid: 1: KCl brine (7% for diesel based drilling fluid and 10% for cleaning white oil based drilling fluid) was determined. 4 AOT 3O 5-13 6% n-butanol, The wetting inversion ability, flushing efficiency and compatibility with drilling fluid and cement slurry were evaluated. The results showed that with the increase of salinity, the phase state of the microemulsion changed from Winsor 鈪，

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