Causes of accelerated сorrosion in сoiled tubing during acid washing of a gas field well

Keywords

coiled tubing, corrosion, steel, acid washing of the well, inhibitor.

Cite as

Vynar V. A., Chuchman M. R., Khoma M. S., Ivashkiv V. R., Vasyliv Kh. B., Gural T. O., Bukliv R. L., and Rudkovskii Ye. M. Causes of accelerated сorrosion in сoiled tubing during acid washing of a gas field well. Physicochemical Mechanics of Materials. 2024. 60(2), 014-019.

https://doi.org/10.15407/pcmm2024.02.014

Abstract

The causes of accelerated corrosion of a coiled tubing НT-95 steel after acid washing of a gas field well in the Poltava Basin were investigated. Corrosion losses of steel in the washing solution do not exceed 3.6 mm/year due to the presence of a corrosion inhibitor in its composition. It was found that after acid treatment of a gas well, the corrosion rate of steel increased by three orders of magnitude. It is shown that the accelerated corrosion of steel occurs due to neutralization of the inhibitor effect and the change in the nature of metal corrosion caused by the high concentration of oxidizing agents such as iron (III) Fe₂O₃ oxides in the well. When Fe₂O₃ interacts with the hydrochloric acid of the washing solu­tion, iron chloride FeCl₃ is formed, which partially neutralizes the inhibitor effect and accelerates corrosion of steel.

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