Corrosion failure analysis of A L80 oil tube thread

2018 International Conference on Construction, Aviation and Environmental Engineering

生态环境科学;生物科学

Rui, Cai^1 ; Wenwen, Xiao^2 ; Yanyan, Xu^2 ; Yuanyuan, Zhu^2 ; Fang, Li^2

CNPC Tubular Goods Research Institute, No. 89 Jinyeer Road, Xi'an, China^1

SINOPEC Northwest Oilfield Company, No. 466 Changchunnan Road, Urumqi, China^2

关键词: Chemical composition analysis;    Chemical compositions;    Corrosion failure analysis;    Corrosion products;    Corrosive medium;    Metallographic examination;    Micromorphologies;    Production analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/233/4/042034/pdf
DOI  :  10.1088/1755-1315/233/4/042034

来源: IOP

【 摘 要 】

Material properties of L80 oil tube thread were tested by means of chemical composition analysis, hardness testing and metallographic examination. The results showed that the content of chemical compositions and HRC value accorded to API SPEC 5CT requirements. Micro-morphology and corrosion production analysis of inner surface were carried out by SEM, EDS and XRD. The results showed that the corrosion products on thread were dense and mainly consisted of FeCO3, but there were a large number of microcracks and micropores in it. The main reason of corrosion for thread sample was crevice corrosion which originated from the infiltration of corrosive medium such as high salinity formation water and CO2 to thread joint.