Study on the Corrosion Mechanism of a Gathering Pipeline in Daniudi Gas Field

ZHOU Jun, PENG Sizhou, LIU Shitao, HAN Jielin, XIONG Zihao, LIANG Guangchuan

doi:10.16577/j.issn.1001-1560.2024.0142

Materials Protection >

2024 , Vol. 57 >Issue 6: 186 - 193

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0142

Study on the Corrosion Mechanism of a Gathering Pipeline in Daniudi Gas Field

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(1. Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China;2. North China Oil and Gas Branch No.1 Gas Plant, China Petrochemical Co., Ltd., Yulin 719000, China)

ZHOU Jun (1987-), Ph.D., Associate Professor, Research Focus: Optimization of Oil and Gas Storage and Transportation Systems and Integrated Energy Systems, Tel.: 18084866536, E-mail: zhoujunswpu@163.com

Received date: 2024-02-01

Revised date: 2024-04-16

Accepted date: 2024-04-25

Online published: 2024-06-26

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Abstract

To clarify the corrosion problem of a certain gathering and transportation pipeline in the Daniudi gas field, corrosion rate tests, micro-morphology observations and corrosion product analyses were conducted on the corrosion coupons and corroded pipe sections on-site. The corrosion mechanism of the gathering pipeline in an H₂S/CO₂ coexistence environment was studied to provide a basis for formulating corresponding corrosion protection measures. Results showed that the average corrosion rate of the corrosion coupon was 0.092 3 mm/a, which was higher than the 0.076 0 mm/a required by the industry standard. The local corrosion rate was 0.157 0 mm/a, the pitting corrosion coefficient was 2.7, and the maximum depth of the corrosion pit on the test piece of the corroded pipe section was 88 μm. The corrosion product film had a loose structure and poor protection performance. The corrosion products mainly contained C, O and S elements, which were much higher than the chemical composition of 20 carbon steel. The corrosion products were mainly composed of FeCO₃, FeS and Fe₂O₃, indicating that the corrosion of the gathering pipeline was mainly caused by CO₂ and H₂S when encountering humid environments.

Key words： Daniudi gas field; gathering pipeline; H₂S/CO₂ coexistence; corrosion mechanism

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ZHOU Jun, PENG Sizhou, LIU Shitao, HAN Jielin, XIONG Zihao, LIANG Guangchuan . Study on the Corrosion Mechanism of a Gathering Pipeline in Daniudi Gas Field[J]. Materials Protection, 2024 , 57(6) : 186 -193 . DOI: 10.16577/j.issn.1001-1560.2024.0142

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