Corrosion Behavior of Materials Used for Surface Gathering and Transportation Pipeline in an Oilfield

doi:10.11902/1005.4537.2019.230

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (6): 557-562 DOI: 10.11902/1005.4537.2019.230

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Corrosion Behavior of Materials Used for Surface Gathering and Transportation Pipeline in an Oilfield

ZHAO Guoxian¹,HUANG Jing¹(

),XUE Yan²

1. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China
2. Xi'an Maurer Petroleum Engineering Laboratory, Co. , Ltd. , Xi'an 710065, China

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Abstract

The corrosion behavior of 20G steel, L245 steel, 5Cr steel, 16Mn steel and 316L stainless steel in CO₂ containing fluids at different temperatures and pressures was assessed by weight loss method via an autoclave, which aims to simulate the operating situation of the field. Then the morphology and composition of corrosion products were characterized by scanning electron microscopy (SEM), electronic energy spectrum (EDS) and X-ray diffraction (XRD). The results show that the average corrosion rate of 20G steel, L245 steel, 5Cr steel, 16Mn steel and 316L stainless steel increases first and then decreases with the increase of CO₂ partial pressure at a given temperature, and with the increase of temperature by a given CO₂ partial pressure respectively. The maximum average corrosion rate of the five materials emerged at 80 ℃ and 0.5 MPa of CO₂ partial pressure. 20G steel, L245 steel, 5Cr steel and 16Mn steel were suffered from non-uniformly general corrosion with corrosion products composed mainly of FeCO₃. Whilst 316L stainless steel was passivated with slight pitting corrosion in the corrosive medium.

Key words: gathering pipeline corrosion rate gas phase liquid phase

Received: 27 March 2019

ZTFLH:

TG172.8

Fund: Supported by Innovation and Practical Ability Training Plan for Graduate Students of Xi'an Shiyou University(YCS18213110)

Corresponding Authors: Jing HUANG E-mail: 842587939@qq.com

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Cite this article:

ZHAO Guoxian,HUANG Jing,XUE Yan. Corrosion Behavior of Materials Used for Surface Gathering and Transportation Pipeline in an Oilfield. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 557-562.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.230 OR https://www.jcscp.org/EN/Y2019/V39/I6/557

Table 1 Comparison of chemical constituents of five tested steels (mass fraction / %)

Table 2 Test conditions for corrosion rate measurement

Fig.1 Average corrosion rates trend of five materials in gas (a) and liquid (b) environment with temperature change under 0.5 MPa CO₂ partial pressure

Fig.2 Average corrosion rates of five materials in gas (a) and liquid (b) environment with partial pressure of CO₂ at 80 ℃

Fig.3 Surface microstructure of 20G steel (a, b), L245 steel (c, d), 5Cr steel (e, f), 16Mn steel (g, h) and 316L stainless steel (i, j) after testing in gas phase (a, c, e, g, i) and liqmid phase (b, d, f, h, j)

Table 3 EDS analysis of corrosion products

Fig.4 XRD analytical atlas of the surface of 20G steel (a), L245 steel (b), 5Cr steel (c), 16Mn steel (d) and 316L stainless steel (e) after testing

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