Effect of inhibitor mixture composition on the protective properties in carbon-dioxide corrosion of steel

Abstract

The problem of corrosion control is one of the cardinal problems in the gas-and-oil producing industry. Because of it, defects occur during operation of oil-field equipment that lead to financial expenses and environmental pollution. The use of inhibitors is the simplest and cheapest method of corrosion protection [1,2]. The presence of carbon dioxide in stratal water contributes to carbon dioxide corrosion of equipment. The specific features of this kind of corrosion require the selection of specific inhibitors in development and operation of wells. They must have high protective properties at minimal concentrations, have a positive impact on the processes of extraction, preparation, transportation and processing of oil and gas [3][4][5][6][7][8]. This paper presents the results on the effect of the composition and concentration of inhibitor mixtures on their protective properties in the corrosion of St3 steel in CO 2 saturated solution of sodium chloride.

A Review of Recent Advances in the Inhibition of Sweet Corrosion

“…These CIs are mainly newly synthesized heterocyclic compounds containing several functional groups. In addition to these compounds, Markosyan et al [138] . tested mixtures with different ratios of isononylphenolethoxyphosphoric esters and monoethanolamine in a water‐isopropanol solution as CIs for St3 steel immersed in CO 2 ‐saturated 3 wt.% NaCl solution, at 20 °C.…”

“…The studies reporting on the corrosion inhibition of these compounds were conducted for steel samples immersed for 1 h–20 days in either CO 2 ‐saturated NaCl solution/brine, [42a,43,79h,j,88e,137–139] or CO 2 ‐saturated simulated oilfield waters, [45b,c,86,108,131e] in a temperature range from room temperature to 80 °C. The corrosion inhibition of 4,6‐diamino‐2‐(benzylthio)pyrimidine was investigated for N80 steel immersed in CO 2 ‐saturated simulated oilfield water [86] with 8 MPa CO 2 partial pressure.…”