Study on the Corrosion Mechanism of Low-Lying Area of Gathering Pipeline in Daniudi Gas Field

LIU Shitao, ZHOU Jun, LIU Yuelong, HAN Jielin, PENG Sizhou, WAN Wei, LIANG Guangchuan

doi:10.16577/j.issn.1001-1560.2024.0185

Materials Protection >

2024 , Vol. 57 >Issue 8: 122 - 129

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0185

Study on the Corrosion Mechanism of Low-Lying Area of Gathering Pipeline in Daniudi Gas Field

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(1.Petroleum Engineering School， Southwest Petroleum University， Chengdu 610500， China；2.Petroleum Engineering Technology Research Institute， Sinopec North China Oil and Gas Branch， Zhengzhou 457001， China；3.No.1 Gas Production Plant， Sinopec North China Oil and Gas Branch， Yulin 719000， China)

ZHOU Jun(1987-)， Ph.D.， Associate Professor， Research Focus: Oil and Gas Storage and Transportation System Optimization， E-mail: zhoujunswpu＠163.com

Received date: 2023-10-25

Revised date: 2024-01-09

Accepted date: 2024-01-15

Online published: 2024-09-24

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Abstract

To investigate the corrosion mechanisms of low-lying areas in the gathering and transportation pipelines of the Daniudi Gas Field，the distribution of accumulated liquid along the pipeline was simulated.A low-lying section of the pipeline located 1 207 m from the starting point was identified as the primary monitoring point.Excavation of pipeline sections and installation of coupons were conducted on-site.Weight loss testing was used to calculate the corrosion rates of the coupons， and the microscopic structure and composition of the corrosion products were characterized using scanning electron microscopy (SEM)， energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).Results showed that the uniform corrosion rate of the coupons at the gas tree was 0.003 5 mm/a， the corrosion degree was slight， and no obvious local corrosion tendency was observed.The uniform corrosion rate of the low-lying coupon was 0.059 9 mm/a， the local corrosion rate was 0.138 0 mm/a， the pitting corrosion coefficient was 2.3， and the degree of localized corrosion was severe.The structure of the corrosion products on the surface of the low-lying pipe samples was loose，and the corrosion products were mainly composed of FeCO3，FeS and Fe2O3.It was speculated that the corrosion was mainly caused by the corrosive gases CO2 and H2S， with Cl- in the effluent playing an accelerating role.

Key words： pipeline internal corrosion; corrosion mechanism; pipeline effusion distribution; surface analysis

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LIU Shitao, ZHOU Jun, LIU Yuelong, HAN Jielin, PENG Sizhou, WAN Wei, LIANG Guangchuan . Study on the Corrosion Mechanism of Low-Lying Area of Gathering Pipeline in Daniudi Gas Field[J]. Materials Protection, 2024 , 57(8) : 122 -129 . DOI: 10.16577/j.issn.1001-1560.2024.0185

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