Inhibiting Composition Against Steel Corrosion in Model Formation Waters of Oil and Gas Fields

In this paper, we study the protective effectiveness of the inhibitory composition (25–200 mg/L) against carbon steel corrosion in model formation waters NACE and M1 containing 400 mg/L of H₂S individually and together with CO₂ using gravimetry, potentiodynamic polarization, and impedance spectroscopy. Its ability to affect the diffusion of hydrogen into the metal and the development of sulfate-reducing bacteria is also estimated. Under static conditions, the protective effect is 73% in the NACE environment and 62% in the M1 environment at room temperature and 74 and 83% at 80°C, respectively. Under hydrodynamic conditions, the protective effect of the composition in the presence of a hydrocarbon phase (10%) reaches 90% in the NACE environment and 77% in the M1 environment. The inhibitory composition accelerates the diffusion of hydrogen into the metal and suppresses the growth of sulfate-reducing bacteria in the Postgate nutrient medium.