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Materials 2016, 9(9), 741; doi:10.3390/ma9090741

A Modelling Study for Predicting Life of Downhole Tubes Considering Service Environmental Parameters and Stress

1
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2
Key Laboratory for Corrosion and Protection (MOE), Beijing 100083, China
3
Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China
*
Author to whom correspondence should be addressed.
Academic Editors: Alex A. Volinsky and Lijie Qiao
Received: 15 July 2016 / Revised: 19 August 2016 / Accepted: 25 August 2016 / Published: 2 September 2016
(This article belongs to the Special Issue Stress Corrosion Cracking in Materials)
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Abstract

A modelling effort was made to try to predict the life of downhole tubes or casings, synthetically considering the effect of service influencing factors on corrosion rate. Based on the discussed corrosion mechanism and corrosion processes of downhole tubes, a mathematic model was established. For downhole tubes, the influencing factors are environmental parameters and stress, which vary with service duration. Stress and the environmental parameters including water content, partial pressure of H2S and CO2, pH value, total pressure and temperature, were considered to be time-dependent. Based on the model, life-span of an L80 downhole tube in oilfield Halfaya, an oilfield in Iraq, was predicted. The results show that life-span of the L80 downhole tube in Halfaya is 247 months (approximately 20 years) under initial stress of 0.1 yield strength and 641 months (approximately 53 years) under no initial stress, which indicates that an initial stress of 0.1 yield strength will reduce the life-span by more than half. View Full-Text
Keywords: mathematic model; life prediction; downhole tube; environmental parameter; stress mathematic model; life prediction; downhole tube; environmental parameter; stress
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Zhao, T.; Liu, Z.; Du, C.; Hu, J.; Li, X. A Modelling Study for Predicting Life of Downhole Tubes Considering Service Environmental Parameters and Stress. Materials 2016, 9, 741.

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