Failure Analysis of N80 Tubing Corrosion Perforation in a Shale Gas Well in South Sichuan

LIU Liangguo, HU Huan, LIU Peng, LU Wei, ZHAO Ke, CENG Dezhi

doi:10.16577/j.issn.1001-1560.2023.0279

Materials Protection >

2023 , Vol. 56 >Issue 11: 193 - 198

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0279

Failure Analysis of N80 Tubing Corrosion Perforation in a Shale Gas Well in South Sichuan

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(1. Institute of Gathering and Transportation Engineering, Southwest Oil and Gas Field Company, Chengdu 610014, China; 2. State Key Laboratory of Oil and Gas Reservoir and Geological Development Engineering, Southwest Petroleum University, Chengdu 610500, China; 3. Sichuan Changning Natural Gas Development Co., Ltd., Chengdu 610000, China; 4. Gas Transmission Management Department of Southwest Oil and Gas Field Company, Chengdu 610200, China)

Received date: 2023-05-25

Revised date: 2023-06-21

Accepted date: 2023-07-20

Online published: 2023-12-25

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Abstract

In order to find out the cause of corrosion perforation failure of N80 tubing in a shale gas well in Sichuan basin, the causes of corrosion and perforation of N80 tubing were systematically analyzed by macroscopic observation, physical and chemical properties examination, tissue analysis, scanning electron microscope observation and energy spectrum analysis, combined with field service conditions. Results showed that the physical and chemical properties and materials of the oil pipe met the requirements, and there were a large number of loose and porous corrosion products on the surface of the oil pipe, which existed in the form of FeCO3, FeS and CaCO3. Moreover, the aggregate of SRB bacteria could be observed, and EDS results suggested the surface corrosion products contained more S elements. Hence, the corrosion perforation of the tubing was mainly caused by microbial corrosion. The coupling effect of CO2 and high Cl- in oil-based drilling fluid accelerated the local corrosion perforation, and adding fungicides could inhibit microbial corrosions of tubing.

Key words： N80 tubing; bacteria corrosion; perforation; failure analysis

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LIU Liangguo, HU Huan, LIU Peng, LU Wei, ZHAO Ke, CENG Dezhi . Failure Analysis of N80 Tubing Corrosion Perforation in a Shale Gas Well in South Sichuan[J]. Materials Protection, 2023 , 56(11) : 193 -198 . DOI: 10.16577/j.issn.1001-1560.2023.0279

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