Development and Performance Evaluation of Corrosion Inhibitors and Scale Inhibitors in Oil Stations
Abstract
In the process of oil extraction, transportation, storage, and refining, a large number of chemical plants are required, and serious corrosion and scaling problems are often encountered during the use of these facilities.Therefore, in this paper, three kinds of imidazoline oil field corrosion inhibitors and four kinds of commonly used scale inhibitors were synthesized in the laboratory. The corrosion inhibition efficiency of corrosion inhibitors was studied by using weight loss method and electrochemical method. The scale experiment analyzed the scale inhibition rules of crude oil yards and evaluated the scale inhibition rates of the four scale inhibitors. The following conclusions were obtained:
Through field investigations of corrosion and scaling at three oil stations in service, it was found that serious corrosion and scaling problems exist at the oil station in service.Three kinds of imidazoline-based corrosion inhibitors were synthesized in the laboratory, and all physical and chemical performance tests were qualified.Imidazolium quaternary ammonium salt corrosion inhibitor has the most significant corrosion inhibition effect.In addition, the fouling rate of the solution increases with the increase of pH value, decreases with the increase of surfactant, increases with the increase of temperature, and increases with the increase of calcium ion concentration; HEDP has the best scale inhibition Performance, but its scale inhibition rate is also affected by temperature, Ca2+ concentration, and NaCO3 concentration.Through the study of this paper, an optimal corrosion inhibitor and scale inhibitor for the oil station is determined, which will help improve the corrosion and scaling protection system at the oil delivery station.
Key words: oil station; corrosion inhibitor; scale inhibitor; weight loss method; electrochemical method; static scale test
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