Romanian oil production is characterized by mature fields with a big variety of different fluid parameters. The total number of wells exceeds 10,000, most of them equipped with sucker rod pumps. Corrosion has been a big challenge in the past decades. Metal consumption was a permanent problem causing high failure rates in pumping units, flowlines, pipelines and production facilities and thus leading to high well intervention and maintenance expenditures as well as to production losses. To maintain the oil production in this environment, the first steps concentrated on identifying corrosion mitigation measures leading to a distinct decrease of internal corrosion covering all operational units.