Influence of Temperature on Corrosion Behaviour of Hot Water Flooding Tubing in Lvda 5-2 Oilfield

The influence of temperature on the corrosion behavior of hot water flooding reinjection pipeline in Lvda 5-2 oilfield was studied by high temperature and high pressure corrosion test. The influence mechanism of temperature on pipeline corrosion was analyzed by scanning electron microscope, energy dispersive spectrometer and X-ray diffractometer. The results showed that with the increase of temperature in the range of 60-260℃, the corrosion rate of pipelines increased first and then decreased, and the peak value appearred at 150℃. The corrosion rate of pipelines at different temperatures exceeded the standard value of 0. 076 mm/a. The corrosion product films formed at different temperatures was quite different. At 60-110℃, there were few corrosion products. At 130℃ and 150℃,Ca_{0. 1}Mg_{0. 33}Fe_{0. 57}(CO₃) were formed, and the products were more and looser. At 180℃, the product film was Ca_{0. 1}Mg_{0. 33}Fe_{0. 57}(CO₃), which was divided into dense bottom layer and loose surface layer. A dense thin layer of CaCO₃ product film was formed at 260℃.