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51313-02298-Corr. Rate of a Downhole Tubular Steel at Diff. CO2 Part. Pressure Temp Calc of Activation Energy

Picture for Corr. Rate of a Downhole Tubular Steel at Diff. CO2 Part. Pressure Temp Calc of Activation Energy
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Product Number: 51313-02298-SG
ISBN: 02298 2013 CP
Author: Arshad Bajvani Gavanluei
Publication Date: 2013
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Corrosion rate of a low alloy tempered martensite downhole tubular steel was studied at different temperatures and CO2 partial pressures using direct weight loss measurement. Experiments were carried out in a high pressure high temperature autoclave. CO2 partial pressures of 40 80 160 and 320 psi were examined at temperatures 25 40 50 and 75 °C. A linear trend between corrosion rate and CO2 partial pressure was observed at different temperatures and increasing CO2 partial pressure increased the slope the lines. In addition at constant CO2 partial pressure increasing temperature increased the corrosion rate. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study the corrosion products formed on the surface. At 50 °C and below only iron and iron carbide were detected using XRD analysis but at 75 °C in addition to iron carbide iron carbonate was also detected. Formation of scattered non-protective iron carbonate crystals was studied using SEM. Finally having the corrosion rate at different temperatures and CO2 partial pressures the activation energy of the corrosion process was calculated.

Corrosion rate of a low alloy tempered martensite downhole tubular steel was studied at different temperatures and CO2 partial pressures using direct weight loss measurement. Experiments were carried out in a high pressure high temperature autoclave. CO2 partial pressures of 40 80 160 and 320 psi were examined at temperatures 25 40 50 and 75 °C. A linear trend between corrosion rate and CO2 partial pressure was observed at different temperatures and increasing CO2 partial pressure increased the slope the lines. In addition at constant CO2 partial pressure increasing temperature increased the corrosion rate. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study the corrosion products formed on the surface. At 50 °C and below only iron and iron carbide were detected using XRD analysis but at 75 °C in addition to iron carbide iron carbonate was also detected. Formation of scattered non-protective iron carbonate crystals was studied using SEM. Finally having the corrosion rate at different temperatures and CO2 partial pressures the activation energy of the corrosion process was calculated.

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