Corrosion analysis of G105 coating drill-pipe washout

Zhouyang Lian; Dongsheng Chen; Wuji Wei; Yongzhang Zhou; Juncheng Jiang

doi:10.1108/ACMM-04-2013-1250

Corrosion analysis of G105 coating drill-pipe washout

Zhouyang Lian, Dongsheng Chen, Wuji Wei, Yongzhang Zhou, Juncheng Jiang

College of Safety Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Purpose – The purpose of this study was to investigate the reason of G105 coated drill-pipes suffering from washout after drilling for 70000–80000 m.

Design/methodology/approach – The microstructure, micromorphology and corrosion products near the washout were analyzed by metallurgical microscopy, SEM and EDS.

Findings – Results showed the metallographic microstructure of the material was typical tempered sorbite. No fatigue crack was observed. Drill-pipe washout was caused mainly by the inclusion of MnS in steel because of the excess S and by damaged coating, both of which induced pit nucleation and promoted the pitting corrosion process. The corrosion hole extended from the interior to the exterior, which resulted in the fracturing of the external drill-pipe surface under pressure.

Originality/value – This paper can give practical help to the selection of drill pipe materials in the future.

Original language	English
Pages (from-to)	365-369
Number of pages	5
Journal	Anti-Corrosion Methods and Materials
Volume	61
Issue number	6
DOIs	https://doi.org/10.1108/ACMM-04-2013-1250
State	Published - 28 Oct 2014

Keywords

API G105 drill pipe
Coatings and linings
Failure investigation
Pitting
Washout

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10.1108/ACMM-04-2013-1250

Cite this

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title = "Corrosion analysis of G105 coating drill-pipe washout",

abstract = "Purpose – The purpose of this study was to investigate the reason of G105 coated drill-pipes suffering from washout after drilling for 70000–80000 m.Design/methodology/approach – The microstructure, micromorphology and corrosion products near the washout were analyzed by metallurgical microscopy, SEM and EDS.Findings – Results showed the metallographic microstructure of the material was typical tempered sorbite. No fatigue crack was observed. Drill-pipe washout was caused mainly by the inclusion of MnS in steel because of the excess S and by damaged coating, both of which induced pit nucleation and promoted the pitting corrosion process. The corrosion hole extended from the interior to the exterior, which resulted in the fracturing of the external drill-pipe surface under pressure.Originality/value – This paper can give practical help to the selection of drill pipe materials in the future.",

keywords = "API G105 drill pipe, Coatings and linings, Failure investigation, Pitting, Washout",

author = "Zhouyang Lian and Dongsheng Chen and Wuji Wei and Yongzhang Zhou and Juncheng Jiang",

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AU - Lian, Zhouyang

AU - Chen, Dongsheng

AU - Wei, Wuji

AU - Zhou, Yongzhang

AU - Jiang, Juncheng

PY - 2014/10/28

Y1 - 2014/10/28

N2 - Purpose – The purpose of this study was to investigate the reason of G105 coated drill-pipes suffering from washout after drilling for 70000–80000 m.Design/methodology/approach – The microstructure, micromorphology and corrosion products near the washout were analyzed by metallurgical microscopy, SEM and EDS.Findings – Results showed the metallographic microstructure of the material was typical tempered sorbite. No fatigue crack was observed. Drill-pipe washout was caused mainly by the inclusion of MnS in steel because of the excess S and by damaged coating, both of which induced pit nucleation and promoted the pitting corrosion process. The corrosion hole extended from the interior to the exterior, which resulted in the fracturing of the external drill-pipe surface under pressure.Originality/value – This paper can give practical help to the selection of drill pipe materials in the future.

AB - Purpose – The purpose of this study was to investigate the reason of G105 coated drill-pipes suffering from washout after drilling for 70000–80000 m.Design/methodology/approach – The microstructure, micromorphology and corrosion products near the washout were analyzed by metallurgical microscopy, SEM and EDS.Findings – Results showed the metallographic microstructure of the material was typical tempered sorbite. No fatigue crack was observed. Drill-pipe washout was caused mainly by the inclusion of MnS in steel because of the excess S and by damaged coating, both of which induced pit nucleation and promoted the pitting corrosion process. The corrosion hole extended from the interior to the exterior, which resulted in the fracturing of the external drill-pipe surface under pressure.Originality/value – This paper can give practical help to the selection of drill pipe materials in the future.

KW - API G105 drill pipe

KW - Coatings and linings

KW - Failure investigation

KW - Pitting

KW - Washout

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JO - Anti-Corrosion Methods and Materials

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Corrosion analysis of G105 coating drill-pipe washout

Abstract

Keywords

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