Preparation And Properties Of High Temperature Tolerance Microemulsified Acid

In this paper, the high temperature tolerance microemulsified acids were prepared by using cethyltrimethylammonium-chloride (CTAC), diesel oil, hydrochloric, ethylene glycol, glycerol, potassium biphthalate (PHP) and potassium bromide (KBr). The high temperature tolerance of microemulsified acid systems were studied. The phase behavior, CaCl2 tolerance and control-released reactivity were investigated. In addition, the effects of temperature and solvents on the thermodynamic parameters of microemulsified hydrochloric acid were investigated. The main conclusions were as follows:1. The CTAC/PHP and CTAC/KBr diesel microemulsified hydrochloric acids which showed good stability at 98℃were obtained by using CTAC as main surfactant, n-butanol and n-octanol as cosurfactant. The factors affecting the phase behavior were confirmed and the optimized diesel microemulsified hydrochloric acid systems were obtained. The CaCl2 tolerance of CTAC/PHP and CTAC/KBr microemulsified acids reached 180000mg/L and 225000mg/L, respectively. The steel corrosion inhibition rates of the CTAC/PHP and CTAC/KBr microemulsified acids were 77.8% and 69.3%, and the marble corrosion inhibition rates were 80.5% and 73.5%.2. The microemulsified hydrochloric acids containing ethylene glycol or glycerol were investigated by using cethyltrimethylammonium-chloride (CTAC) as main surfactant, n-butanol and n-octanol as cosurfactant. The steel corrosion inhibition rate and the marble corrosion inhibition rate of the microemulsified acid containing ethylene glycol were 73.7% and 88.4%, respectively. The steel corrosion inhibition rate and the marble corrosion inhibition rate of the microemulsified acid containing glycerol were 72.7% and 88%, respectively.3. The diesel microemulsified hydrochloric acid was obtained by using cethyltrimethyla-mmonium-chloride(CTAC) as main surfactant and n-octanol as cosurfactant. The effects of temperature and solvents on the thermodynamic parameters of microemulsified hydrochloric acid were studied.The study of this paper improved the temperature tolerance of microemulsified acid and provided basis for the application of microemulsified hydrochloric acid in the field of deeply acidification for low penetrability oil field.