The corrosion process of p-110 steel in stimulation fluids used in the oil industry

  • Jorge Andrés Calderón Gutiérrez Universidad de Antioquia.
  • Gloria Fernanda Bonilla Universidad de Antioquia.
  • Javier Alejandro Carreño Instituto Nacional de Tecnología.
Keywords: EDTA electrolytes, Chelating agents, Electrochemical techniques, Metal dissolution

Abstract

The use of chelating agents in the oil well stimulation processes has been proposed as an alternative to the acid treatment when the formations damage do not allow the usage of strong chemical attack. However, this procedure can arouse the corrosion of the steel used in the infrastructure of the oil production. In this study, the corrosion kinetics of the P-110 steel in ethylenediaminetetraacetic acid (EDTA)-based fluids is assessed under different conditions of evaluation. Linear polarization was performed in different hydrodynamic regimes and at different temperatures, in order to evaluate the kinetic of steel corrosion. The working electrolyte solution comprises 10% disodium EDTA and 20% tetrasodium EDTA. The increase of temperature from 25 to 80°C in both electrolytes increments the corrosion rate of steel in at least one order of magnitude; particularly in EDTA-Na2 solutions. Corrosion rates of 0.29x101 and 1.67x102 mm.y-1 were measured at 25 and 80°C, respectively. The hydrodynamic regime plays an important role in the corrosion of steel only in the disodium solution, where corrosion rates were increased at higher rotation speeds of the electrode. The cathodic depolarization effect is more important in the EDTA-Na2 than in the EDTA-Na4 solution, making it more corrosive.

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How to Cite
Calderón Gutiérrez, J. A., Bonilla, G. F., & Carreño, J. A. (2014). The corrosion process of p-110 steel in stimulation fluids used in the oil industry. CT&F - Ciencia, Tecnología Y Futuro, 5(4), 35-48. https://doi.org/10.29047/01225383.39

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Published
2014-06-15
Section
Scientific and Technological Research Articles
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