关键词: 油田, 污水, 回注, 缓蚀剂

Abstract: Various imidazoline corrosion inhihtors were prepared 6y reduction between aliphticacids and diethylenteriamine and further quaterized to form derivatives of inidaolines.Several test methods such as weight-loss linear polarization,polarization curve and ACimpedancewere used to evaluate the performance of corrosion inhibitor.A optimum corrosion inhibitor HO-8 was screened out from these measurement.Effect of H₂S in water flooding on the prop-erties of corrosion inhibitors was studied.The effects of temperature,salt content and otherwater treatment chemicals of the speed of film forming were discussed.The AC impedanceand modern instrument analysis methods,e.g.,FT-IR,NMR and AES were applied to studythe inhibition mechanism of corrosion inhibitors.It was indicated that imidazoline moleculeswere adsorbed on the metal surface to inhibit metal corrosion.Under the action of hydrogensulfide,corrosion inhibitors react with FeS to form surface complexes and enhance the protection performance of film.Corrosion inhibitor HO-8 can be used as a multi-functional watertreatment chemical in oil field flooding water.

Key words: oil field, waste water, retnjectto n, corrosion inhibitor