Online Monitoring System of Sewage Corrosion Based on Smart Injection of Inhibitor in Shengli Oilfield

An online corrosion monitoring system based on electrochemical impedance principle and oil-proof electrochemical probe was established for the oil bearing-sewage gathering pipelines in Shengli oilfield. Thanks to the fuzzy control method and the corrosion data from the monitoring sites ahead and behind the inlet of corrosion inhibitor and the outlet of sewage,we propose a solution to the corrosion surveillance and smart injection of corrosion inhibitor for the gathering pipelines. According to the solution,a surveillance server will give instruction to adjust the injection rate of inhibitor based on the trend of field corrosion rate and the fuzzy control model. This smart inhibitor injection system not only reduces the corrosion rate of gathering pipelines to the recommended standard,but also avoids the over dosage of inhibitor and reduces the cost of sewage treatment.