Corrosion Behavior for Casing in Producing Well with Water Injection Technology during Long-Term Service

Abstract:

Corrosion leakage became serious due to cyclic sewage injection and continuous increase in water injection pressure. Corrosion behavior for N80 casing was studied during long-term service, using corrosion reaction kettle and weight loss method. The morphology and composition were characterized with laser confocal microscopy (LCM), scan electron microscopy (SEM) and energy disperse spectroscopy (EDS). These results showed that corrosion rate remained constantly at initial stage, and increased gradually, then sharply reached to 0.327mm/a at later stage, accompanying with inflection point under oxygen condition. Meanwhile, corrosion rate decreased significantly from 0.028mm/a to 0.020mm/a under oxygen-free condition. The corrosion of N80 steel was dominated by dissolved oxygen, and accelerated by chloridion. The micro-mechanism was suggested to be the transition of defect structure from crack with micron range to etch pit with millimeter range.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 1168-1173
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.1168
• Online since: May 2020
• Authors: Xin Sun, Rong Li Nan, Bo Zhao Shu, Hang Wang*, Li Juan Zhu, Li Hong Han
• Keywords: Casing, Corrosion Rate, Defect Structure, Water Injection Technology

References

[1] H Liu, X.H Pei, K Luo, Current status and trend of separated layer water flooding in China, Petro. Exp. and Dev. 40(2013) 733-740.

[2] H Liu, X.H Pei, D.L Jia, Connotation, application and prospect of the fourth-generation separated layer water injection technology, Petro. Exp. and Dev. 44(2017) 608-613.

DOI: 10.1016/s1876-3804(17)30073-3

[3] Y.L Zhang, L Han, X.L Song, Stress corrosion cracking behavior of austenitic stainless steel in sulfur containing waste water, Corros. Sci and Prot Tec. 30(2018)513-519.

[4] J.D Wang, X Chen, Z.B Wang, Corrosion behavior of Q235 steel in sour water, Cor. Sci and Pro. Tec. 9(2017) 485-490.

[5] Y Ma, P Ren, B.N Niu, Corrosion characteristics of produced water with high sulfide in northern Shaanxi, Corros. Sci and Prot Tec. 29(2017)27-36.

[6] D.X Han, Y.G Xie, X.J Tian, Corrosion and scaling control for tubing and casing in Sewage reinjection well, Corros. Sci and Prot Tec. 27(2015)397-404.

[7] T Wang, S.L Yang, W.H Zhu, Law and countermeasures for the casing damage of oil production wells and water injection wells in Tarim oilfield, Petro. Exp. and Dev. 38(2011)352-360.

DOI: 10.1016/s1876-3804(11)60038-4

[8] G.Q Zhang, M Chen, Y.D Geng, Casing damage mechanism in sand producing formations, Petro. Exp. and Dev. 32(2005) 112-118.

[9] H.J Yang, H Pan, Y Zhang, Corrosion inhibition effect of de-oxygenation on down-hole string of air foam flooding process and de-oxygenation limit, Acta Petro Sin. 40(2019)99-108.

[10] G.Z Liao, H.J Yang, Y.W Jiang, Application scope of oxygen-reduced air flooding and the limit of oxygen content, Petro. Exp. and Dev. 45(2018)105.

[11] Preparation, Installation, Analysis, and Interpretation of Corrosion Coupons in Oilfield Operations, NACE Standard RP0775-2005, Item No.21017.

[12] Z Zhang, Z.W Liu, Y.H Xie, Influence of shaft load-corrosion coupling on the service life of carbon steel casing pipe, Acta. Petro. Sin. 38(2017) 342-349.

[13] S Guo, E.H Han, H.T Wang, Life prediction for stress corrosion behavior of 316L stainless steel elbow of nuclear plant, Acta. Metall. Sin. 53(2017) 455-461.

[14] P.L Ge, G Lin, X.L Zhang, Review of down hole tubing corrosion of water/gas injection well and anti-corrosion measures, Cor. Sci and Pro. Tec. 30(2018)324-330.

[15] G.X Zhao, Y.Y Wang, Y.X Lu, Corrosion behavior of Q345R steel in simulated high mineralization waters, Cor. Sci and Pro. Tec. 30(2018) 468-473.