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Modification of D-W model for corrosion rate of shale gas pipeline under the synergistic corrosion of SRB and CO2

Xingyu Peng (Southwest Petroleum University, Petroleum and Natural Gas Engineering School, Chengdu, Sichuan, China)
Xinyue Liu (Southwest Petroleum University, Petroleum and Natural Gas Engineering School, Chengdu, Sichuan, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 13 May 2021

Issue publication date: 2 July 2021

140

Abstract

Purpose

The purpose of this paper is to develop an equation for the synergistic corrosion of SRB and CO2 based on the D-W model.

Design/methodology/approach

The bacterial types in the a and ß pipelines were studied by the most probable number method, and the corrosion morphology of L360 in pipeline water samples was studied by surface analysis. The corrosion rate of L360 was studied using the weight loss method. The gray correlation method was used to calculate the degree of correlation between the influencing factors of corrosion under the synergistic effect of CO2 and SRB. The curve obtained from PIPESIM software and experiments data was then fitted using multiple non-linear regression method by MATLAB software.

Findings

The equation was used to predict the corrosion of the ß pipeline for verification, and it was found that seven out of ten excavation sites were within a 20% error range.

Originality/value

Using the gray correlation method, an equation that considers synergistic corrosion of SRB and CO2 has been developed based on the D-W model. The equation could be used to predict the corrosion rate of shale gas gathering pipelines through SRB and CO2 synergistic corrosion.

Keywords

Acknowledgements

The authors thank Sha He, Lan Zhang and Jiansheng Yu for their help in the experiment and pipeline excavation.

Citation

Peng, X. and Liu, X. (2021), "Modification of D-W model for corrosion rate of shale gas pipeline under the synergistic corrosion of SRB and CO2", Anti-Corrosion Methods and Materials, Vol. 68 No. 3, pp. 150-159. https://doi.org/10.1108/ACMM-10-2020-2397

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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