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267 results on '"Liao, Kexi"'

3. Corrosion Behavior and Corrosion Prediction Model of X65 Steel under Flowing Conditions in Oxygen-Containing Systems

Author

ZHANG Jinlong, JIANG Pan, LIAO Kexi, HE Guoxi

Subjects
water injection subsea pipeline, oxygen-containing system, high-temperature autoclave test, corrosion behavior, corrosion prediction model, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

The medium of X65 steel injection sea pipe contains dissolved oxygen, causing severe corrosion inside the pipeline. Regarding this issue, based on the basic data of the on-site water injection subsea pipeline, considering the effects of flow rate, temperature, dissolved oxygen and Cl- concentration on the corrosion behavior of X65 steel, 9 sets of orthogonal tests were designed, and the weight loss test and corrosion product characterization were carried out by using high temperature autoclave, scanning electron microscope and X-ray diffractometer. Combined with multiple linear regression method, a corrosion prediction model was established. Results showed that the order of the degree of influence of the four influencing factors on corrosion rate from large to small was: dissolved oxygen concentration > temperature > flow rate> Cl- concentration, and dissolved oxygen concentration was the main control factor of corrosion. The corrosion rate increased with the increases of flow rate, temperature, dissolved oxygen concentration and Cl- concentration. The characterization results of corrosion products showed that the corrosion products were mainly Fe3O4 and Fe2O3. Considering the influence of the above four factors, a corrosion prediction model was established based on seven groups of uniform corrosion rate values. Furthermore, the remaining two groups of uniform corrosion rate values were used to validate the corrosion prediction model, and the maximum error was 8.9%, indicating that the corrosion rate prediction model was accurate.

Published
2024
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26. Summary on Influencing Factors and Evaluation Methods of the Efficiency of Corrosion Inhibitor for Oil and Gas Gathering and Transportation

Author

YE Nan, LIAO Kexi, HE Guoxi, TAN Min, ZHAO Shuai

Subjects
oil and gas field, gathering and transportation pipeline, corrosion inhibitor, corrosion inhibition efficiency, influencing factors, evaluation method, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

Adding corrosion inhibitor is one of the conventional methods to slow down the corrosion of the gathering and transportation system in oil and gas fields, as this method has the advantages of low cost, high efficiency, easy operation and having no effect on the basic properties of the medium. However, the on - site pipeline transportation environment is complex, and the corrosion inhibition efficiency is affected by many factors. In this paper, the influence rules of corrosion inhibitor properties, pipeline materials and environment on corrosion inhibition efficiency were reviewed. Results showed that there were many factors affecting corrosion inhibition efficiency and the rules were complex, which needed to be analyzed according to the actual situation. There were few studies on interaction effects of various parameters. In addition, the commonly used laboratory evaluation methods of corrosion inhibitors were summarized. At present, the evaluation methods of corrosion inhibitors mainly include weight loss method, electrochemical evaluation method, quantum chemical theory evaluation method, molecular dynamics simulation method and various surface analysis methods such as scanning electron microscopy (SEM), energy dispersive analysis (EDS), X - ray diffraction (XRD), X - ray photoelectron spectroscopy (XPS), 3D microscopy, atomic force microscopy (AFM) and electrochemical quartz crystal microbalance (EQCM). Finally, the development direction of corrosion inhibitors, the research on the main controlling factors affecting the corrosion inhibition efficiency, and the evaluation methods of corrosion inhibition efficiency were prospected. In order to make the screening and evaluation of corrosion inhibitors more consist with the actual situation, the corrosion inhibition efficiency should be evaluated under the pre - corrosion condition in a flowing environment, and the local corrosion rate should be paid attention to. Also, the importance of finding the key factors affecting the corrosion inhibition efficiency was pointed out.

Published
2022
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