Analysis of 20 Steel Sewage Pipe Corrosion Failure in a Shale Gas Field

XIE Hui, YU Chao, HUA Jing, JIANG Xiu, MI Ying, LIU Lan, HU Mengqi, YIN Xilu

doi:10.16577/j.issn.1001-1560.2025.0053

Materials Protection >

2025 , Vol. 58 >Issue 3: 164 - 173

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0053

Analysis of 20 Steel Sewage Pipe Corrosion Failure in a Shale Gas Field

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(1.State Key Laboratory of Chemical Safety， Qingdao 266100， China；2.SINOPEC Research Institute of Safety Engineering Co.， Ltd.， Qingdao 266100， China；3.SINOPEC Jianghan Oilfield Company No.1 Gas Production Plant， Chongqing 404020， China)

JIANG Xiu (1976－)， Researcher， Ph.D.， Research Focus: Corrosion Protection and Safety in the Oil and Gas Field， E-mail:jiangx.qday＠sinopec.com

Received date: 2024-10-18

Revised date: 2024-12-12

Accepted date: 2024-12-13

Online published: 2025-04-16

Supported by

SINOPEC Innovation Scheme (A-382)

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Abstract

In order to investigate the causes of corrosion-induced perforation failure of 20 steel sewage pipes in a shale gas field，scanning electron microscopy (SEM)， energy dispersive spectroscopy (EDS) and Raman spectroscopy were used to observe the corrosion morphology and characterize the corrosion products of the sewage pipes in a shale gas field.Corrosion simulation tests were conducted based on the actual operating conditions， and the causes of corrosion failure of the 20 steel sewage pipes were systematically analyzed.Results showed that there were sulfate-reducing bacteria (SRB)， saprophytic bacteria (TGB) and other bacteria， and the sewage had a significant scaling tendency.The corrosion products on the sewage pipe surface were mainly Fe2O3， FeCO3， and FeOOH， with Cl and S elements accumulated in the pits under the corrosion layer.As the immersion time in sewage increased， the uniform corrosion rate and the maximum pitting corrosion rate of the 20 steel initially decreased and then increased， with the pitting depth increasing rapidly in the later stage of corrosion.Under-scale corrosion and bacterial corrosion were identified as the main factors contributing to the corrosion failure of the sewage pipes.

Key words： 20 steel; shale gas field; sewage pipeline; failure analysis

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XIE Hui, YU Chao, HUA Jing, JIANG Xiu, MI Ying, LIU Lan, HU Mengqi, YIN Xilu . Analysis of 20 Steel Sewage Pipe Corrosion Failure in a Shale Gas Field[J]. Materials Protection, 2025 , 58(3) : 164 -173 . DOI: 10.16577/j.issn.1001-1560.2025.0053

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