Effect of Pre-film Time, Corrosion Temperature and Medium Flow Velocity onCorrosion Inhibition Performance for Oil Well Pipe Inhibitor

P110S tubing steel was pre-filmed with imidazoline corrosion inhibitors, and then the corrosion test was performed. The effects of pre-film time (0.5-4 h), corrosion temperature (30-120 ℃) and medium flow velocity (2-12 m·s^-1) on the corrosion inhibition performance were studied. The results show that with the increase of inhibitor content and pre-film time, the corrosion inhibition rate and the film formation effect on the tubing steel surface increased. The corrosion inhibition performance was relatively good at the inhibitor mass concentration of 300 mg · L^-1and pre-film time of 2 h. With increasing temperature, the inhibitor inhibition rate decreased, the corrosion resistance of the 2 h pre-filmed sample decreased first and showed the worst at 80 ℃; the inhibitor started to fail. The corrosion rate of the 2 h pre-filmed sample increased with the flow velocity. When the medium flow velocity was higher than 10 m·s^-1, the pre-filmed samples were seriously corroded, and the corrosion inhibitor was no longer applicable.