Nitrates Induced Stress Corrosion Cracking in Tubing Connections from Oil Well

Peng Wang; Gang Gao; Mao Xian Xiong; Nan Ji; Xin Hu Wang; Yao Rong Feng

doi:10.4028/www.scientific.net/MSF.944.1076

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HomeMaterials Science ForumMaterials Science Forum Vol. 944Nitrates Induced Stress Corrosion Cracking in...

Nitrates Induced Stress Corrosion Cracking in Tubing Connections from Oil Well

Abstract:

The 110 Ksi tubing failed in use when reservoir acidification reconstruction and production testing were performed in an oil well, which were longitudinal cracking of coupling. Failure analysis was conducted on the coupling. The failure zone was studied by means of macroscopic analysis, metallographic, scanning electronic microscope,energy dispersive spectrometer and X-ray diffraction analysis etc. The results indicated that the failure of the coupling is caused by stress corrosion cracking (SCC). SCC initiated from the exterior surface of coupling and displayed the fracture feature of intergranular crack propagation. The corrosion products at the grain boundaries were found to be mainly some oxides. The failure was in connection with the completion fluid composition, which are mainly nitrates.

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Periodical:

Materials Science Forum (Volume 944)

Pages:

1076-1081

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.944.1076

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Online since:

January 2019

Authors:

Peng Wang*, Gang Gao, Mao Xian Xiong, Nan Ji, Xin Hu Wang, Yao Rong Feng

Keywords:

Nitrates, Oil Well, Stress Corrosion Cracking, Tubing Connections

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