一种微乳酸体系的实验室研究

Laboratory Research of One Micro-Emulsified Acid System

为降低酸化过程中酸液对油管和套管的腐蚀,增加酸液对地层的穿透距离,通过阳-非离子表面活性剂复配,成功制备了单相微乳土酸体系。并得出了较优的实验室配方(质量分数):A-126 2.5%,CHJ-102.5%,正丁醇1.2%,正辛醇2.3%,W-221 0.5%,土酸67.0%,柴油24.0%。通过添加适量的阴离子表面活性剂W-221,使体系在81℃保持了良好的热稳定性。在室温和70℃下分别与P110S钢片反应,与同浓度的土酸相比,缓蚀率达到90.57%。在70℃下与人造砂岩岩芯反应,溶蚀率降低到了0.5%。

Single phase micro-emulsified acid was studied in laboratory aimed at reducing its corrosion on pipes in the process of acidizing and increasing the penetration range of the layer.Micro-emulsified acid were prepared by mixing cationic surfactant with nonionic surfactant and other additives.The laboratory formation of the single phase micro-emulsified mud acid were as following（mass ratio）：2.5% A-126,2.5% CHJ-100,1.2% n-butanol,2.3% n-octanol,0.5% W-221,67.0% mud acid,24.0% diesel oil.The result shows that its thermal stability can reach 81 ℃ with the suitable amount of additive of anionic surfactant W-221.The reactions between the micro-emulsified acid and P110S steel under both room temperature and 70 ℃ showed that the ratio of inhibiting corrosion has reached to 90.57% compared with mud acid of the same concentrations.Finally,the reaction between the acid and man-made rock core under 70 ℃ shows that the corrosion rate reduce to 0.5%.