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51313-02736-Performance of Corrosion Inhibitors Under Different Flow Regimes

Picture for Performance of Corrosion Inhibitors Under Different Flow Regimes
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Product Number: 51313-02736-SG
ISBN: 02736 2013 CP
Author: Andrea Sanchez
Publication Date: 2013
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A widely method to control corrosion in oil and gas pipelines is the use of corrosion inhibitors. However their performance can be affected by their chemical composition concentrations used and flow regimes. This investigation presents the comparison of two types of corrosion inhibitors a water-soluble and an oil-based at concentrations of 0 ppm 20 ppm 40 ppm and 80 ppm in a multiphase flow saturated with CO2 using a carbon steel SAE 1020 rotating cylinder electrode (ECR) assessed through linear polarization resistance and potentiodynamic polarization techniques. The tests were conducted at different water-to-oil ratios (2:8. 2:3 8:2) and at different linear velocities (0.32 0.64 0.97 and 1.29 m/s) to represent laminar and turbulent flows. As a result emulsions were formed and increased as the water-to-oil ratio and the concentration of the water-soluble inhibitor increased. In contrast formation of emulsions decreased as the concentrations of the oil-based inhibitor increased. The efficiency of the inhibitors was affected by the viscosity of the emulsion was formed. The water-based inhibitor presented the best performance with efficiencies of up to 80%. The efficiency of the oil-based inhibitor was dependent on the water-to-oil ratio and the oil substitute.

A widely method to control corrosion in oil and gas pipelines is the use of corrosion inhibitors. However their performance can be affected by their chemical composition concentrations used and flow regimes. This investigation presents the comparison of two types of corrosion inhibitors a water-soluble and an oil-based at concentrations of 0 ppm 20 ppm 40 ppm and 80 ppm in a multiphase flow saturated with CO2 using a carbon steel SAE 1020 rotating cylinder electrode (ECR) assessed through linear polarization resistance and potentiodynamic polarization techniques. The tests were conducted at different water-to-oil ratios (2:8. 2:3 8:2) and at different linear velocities (0.32 0.64 0.97 and 1.29 m/s) to represent laminar and turbulent flows. As a result emulsions were formed and increased as the water-to-oil ratio and the concentration of the water-soluble inhibitor increased. In contrast formation of emulsions decreased as the concentrations of the oil-based inhibitor increased. The efficiency of the inhibitors was affected by the viscosity of the emulsion was formed. The water-based inhibitor presented the best performance with efficiencies of up to 80%. The efficiency of the oil-based inhibitor was dependent on the water-to-oil ratio and the oil substitute.

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