Russian Federation
Kazan, Russian Federation
Russian Federation
This paper presents the results of studies of the inhibitory ability of heterocyclic nitrogen-containing compounds of the imidazoline class in relation to the general corrosion of steel samples made of St3sp grade on a model of mineralized formation water (in the absence of oxygen) of oil and gas fields. Researches of the effectiveness of metal protection by the tested corrosion inhibitor reagents were carried out using traditional methods, according to GOST 9.506-87: electrochemical method for obtaining polarization curves and estimating the density of corrosive current; gravimetric method in a U-shaped cell under conditions of high-speed circulation of the medium, which was used as an imitation of mineralized formation water with a density of 1,12 g/cm3 and the composition, g/dm3: CaCl2‧6H2O - 34; MgCl2‧6H2O - 17; NaCl - 163; CaSO4‧6H2O - 0,12. It has been established that the corrosion properties of steel (St3sp) and the effectiveness of the protective action of the reagents tested as inhibitors in model formation water are determined by the nature of the specific compound and its concentration. According to the results of the electrochemical method, when each of the studied reagents is introduced into the test environment in an amount of 0,0002 mol/l, the corrosion potential shifts to a region of more positive values by 100-150 mV, and the corrosion current density and corrosion rate (mm per year) decrease by 2-4 times, compared with an uninhibited environment. With an increase in the reagent concentration by an order of magnitude or more, the degree of protection against corrosion by inhibitor IK2 increases, and in the case of IK1, IK3, IK4, it decreases. According to gravimetric measurements, the protective effect of the tested inhibitors (dosage 0,0002 mol/l) decreases in the range: IK2 >IK1 > IK3 > IK4. It was found that the reagent IK2 (imidazole C3H4N2) fully satisfies the necessary requirements for corrosion inhibitors (corrosion rate in imitation formation water 0,03 mm per year, protective effect 93%), while the reagent IK1 (2-methylimidazole C4H6N2) partially meets the requirements (corrosion rate in imitation formation water 0.1 mm per year).
IMIDAZOLINES, RESERVOIR WATER, CORROSION INHIBITORS, CORROSION RATE, INHIBITOR EFFECTIVENESS, DEGREE OF PROTECTION
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