Laboratory Research of One Micro-Emulsified Acid System

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%.