PROTECTIVE PROPERTIES OF CORROSION INHIBITORS BASED ON NITROGEN-CONTAINING COMPOUNDS AGAINST CARBON DIOXIDE CORROSION OF STEEL IN THE PRESENCE OF SULFATE-REDUCING BACTERIA

Internal corrosion remains one of the most significant issues affecting the reliability and durability of oilfield equipment. An effective and technologically advanced method for slowing down the corrosion rate is the use of corrosion inhibitors. This study examines a range of active bases for corrosion inhibitor production to select the most suitable composition that ensures a high level of protection for industrial use. The effectiveness of corrosion inhibitors was evaluated using electrochemical and gravimetric methods. The "post-effect" was assessed under periodic reagent dosing. The research results showed that the samples differ in their protective properties. Some did not provide the required level of protection, while others demonstrated a high protective effect. Based on the conducted tests, the most promising inhibitor formulation was selected, demonstrating high efficiency and availability of raw material components. Additionally, the influence of the alkyl radical length in the corrosion inhibitor molecule on the corrosion rate was studied. The highest efficiency of the proposed corrosion inhibitor is observed at an alkyl radical length of C12-14. The obtained data can be used in the development of industrial production of corrosion inhibitors, reducing dependence on imported active bases. The inhibitor composition was tested in accordance with the requirements of oil companies, including determining the specific effective dosage, the aggressiveness of the commercial form, and solubility in reservoir fluids. Additionally, the adsorption properties of the corrosion inhibitor were studied. Tests were conducted to assess the bactericidal properties of the corrosion inhibitor-bactericide. Based on the obtained results, the corrosion inhibitor was recommended for pilot industrial trials in the oil fields of Western Siberia.