51313-02585-Evaluating Inhibitor Performance in CO2-Saturated Erosion-Corrosion Environments

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Product Number: 51313-02585-SG

ISBN: 02585 2013 CP

Author: Richard Barker

Publication Date: 2013

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Over the last decade significant advancements in chemical inhibition have enabled operators to use carbon steel pipework in oil and gas facilities where sand production is a concern. The ability of these chemicals to reduce both the electrochemical corrosion reactions and the mechanical damage attributed to particle impingement is well documented. This paper presents a review of five commercially available oilfield corrosion inhibitors (four standard corrosion inhibitors and one high shear inhibitor) in an effort to establish their performance in erosion-corrosion environments. Experiments were conducted at 45°C using a submerged impinging jet (SIJ) in CO2-saturated conditions with a fluid velocity of 14 m/s and a sand loading of 500 mg/L. A combination of gravimetric measurements in-situ electrochemistry and surface profilometry allowed the inhibitors to be assessed based on a number of different parameters (i.e. reduction in weight loss in-situ corrosion rate and total penetration depth). The result demonstrated the important of surface analysis techniques when evaluating the performance of chemicals and showed that weight loss and in-situ electrochemical techniques alone could potentially provide misleading information on inhibitor performance in laboratory tests. This evaluation is particularly important in erosion-corrosion environments on sections of pipework where no semi-protective corrosion product formation occurs.