After drilling oil wells using oil-based drilling fluid, there is the occurrence of a formation of a thin layer of solids adsorbed on the surface, called filter cake, which must be removed to obtain satisfactory well cementation. The present work developed microemulsion systems from sodium dodecyl sulfate, a biodegradable surfactant, with kerosene as oil phase, n-butanol as cosurfactant and distilled water, in order to evaluate its efficiency in removing the filter cake. The results showed that the microemulsion systems composed of inverse and bicontinuous micelles removed 100% of the filter cake regardless of the content of the constituents in the formulation, while the direct micelles only reached 100% with the formulation composed by 10% kerosene and cosurfactant/surfactant ratio = 4. It was observed that the cosurfactant/surfactant ratio is a determining variable for direct micelles to remove 100% of the filter cake and that they are compatible with cement, offering desirable thermal stability and improving the wettability of the rock in water.

中文翻译：

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SDS表面活性剂微乳液在去除油基钻井液滤饼中的应用：助表面活性剂的影响

在使用基于油的钻井液对油井进行钻探之后，会在表面上形成一层很薄的固体吸附层，称为滤饼，必须将其除去以获得满意的固井效果。目前的工作是从十二烷基硫酸钠（一种可生物降解的表面活性剂）开发的微乳液系统，其中以煤油为油相，以正丁醇为辅助表面活性剂和蒸馏水，以评估其去除滤饼的效率。结果表明，由反胶束和双连续胶束组成的微乳液体系去除了100％的滤饼，无论配方中成分的含量如何，而直接胶束仅在由10％煤油和助表面活性剂组成的配方中达到100％表面活性剂比= 4。