Abstract: Reversible invert emulsion can combines the advantages of different liquid forms in one to play a better role that is expected, it is mainly used to prerare reversible invert emulsion drilling fluid. Thought about the hydrochloric acid used in the oilfield is mainly industrial hydrochloric acid(concentration is 15%~20%),which is different from the diluted hydrochloric acid(concentration is near 5%) used in laboratory, and the concentration of different batches industrial hydrochloric acid is also different, this paper take a study on the effect of the concentration of acid and alkali on the performance of the pH⁃responsive reversible invert emulsion.Studies have been conducted on the effects of acid and base concentration on the pH⁃controlled reversible emulsion,by measuring microstructure and bulk properties of the emulsion.The studies demonstrated that, different acid/base concentrations result in different acid/base densities can affecting the phase transition point of the reversible emulsion, the difference in acid/base concentration causes the volume of the aqueous phase accompanying the addition of acid/base to the emulsion system, which also affects the phase transition point of the reversible emulsion, but the former has a greater impact than the latter.

Key words: Reversible invert emulsion, Emulsion phase inversion, pH?responsive, Concentration of acid and alkali

摘要： 可逆乳状液能集中不同液体形式的优点发挥更好的作用，主要应用于制备可逆乳化钻井液。油田现场用工业HCl质量分数（15%~20%）一般高于室内研究用稀释HCl质量分数（5%左右），且不同批次工业HCl质量分数差别较大，基于此，研究不同酸碱质量分数下乳状液微观结构与宏观性质随酸碱加量的变化，分析酸碱质量分数对pH控制的可逆乳状液可逆转化行为的影响。结果表明，可逆乳状液酸致转相点处“酸液质量分数×酸液体积”数值随HCl质量分数增加而减小，碱致转相点处“碱液质量分数×碱液体积”数值随碱液质量分数增加而减小。分析机理为：酸碱质量分数不同导致酸碱密度不同，随酸碱加入乳状液体系中的水相体积不同均会对可逆乳状液转相点产生影响，但前者影响大于后者。

关键词: 可逆乳状液, 乳状液转相, pH控制, 酸碱质量分数