Corrosion Behavior of Pipeline Steel X65 in Oilfield

doi:10.11902/1005.4537.2014.196

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (5): 393-399 DOI: 10.11902/1005.4537.2014.196

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Corrosion Behavior of Pipeline Steel X65 in Oilfield

Shuan LIU^1,²,Xia ZHAO¹(

),Changwei CHEN¹,Baorong HOU¹,Jianmin CHEN²

1. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2. Key Laboratory of Marine Materials and Related Ningbo Technologies, Institute of Materials Technologies and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

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Abstract

The inner- and outer-surface corrosion behavior of X65 pipeline steel used in Shengli Chengdao oilfield was studied in this paper. The inner surface corrosion behavior of X65 pipeline steel in oil-water mixtures with different flow rate and oil content was examined by means of mass loss method and electrochemical technique. The corrosion resistance of the outer surface of X65 pipeline steel in soil extracts was also examined by means of polarization curves and electrochemical impedance spectroscopy (EIS). The phase constituents and surface morphology of corrosion products were characterized by using X-ray diffraction techniques (XRD) and scanning electron microscopy (SEM), respectively. The results indicated that the corrosion rate of X65 steel increased with the increasing flow rate of oil-water mixture, which could reach the maximum value when the oil content was 0.5% (mass fraction). The corrosion current density of X65 steel increased with immersion time in soil extracts. A loose corrosion product film formed on the steel surface, which can accelerate the cathodic depolarization reaction.

Key words: X65 pipeline steel corrosion behavior soil extract velocity oil content

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Cite this article:

Shuan LIU, Xia ZHAO, Changwei CHEN, Baorong HOU, Jianmin CHEN. Corrosion Behavior of Pipeline Steel X65 in Oilfield. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 393-399.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2014.196 OR https://www.jcscp.org/EN/Y2015/V35/I5/393

Fig.1 Schematic diagram of the corrosion test cell (1-Base tray, 2-X65 steel, 3-Electrode, 4- Probe, 5-Heater, 6-Air vent, 7-Holder, 8-Wire line, 9-Pulley, 10-Turbine reducer, 11- Power machine, 12-Pressure gauge, 13-Air inlet, 14-Thermocouple, 15-Autoclave, 16- Electrochemical monitor, 17-Computer)

Fig.2 Effects of oil content and velocity of oil emulsion on corrosion rate of X65 steel

Fig.3 Surface microscopic images of X65 steel after adsorption of 5% (a), 10% (b) and 50% (c) oil phase in mass fraction

Fig.4 Tafel polarization curves of X65 steel after immersion for 2 d in the solution containing 0% (a), 0.5% (b) and 1% (c) oil

Fig.5 Nyquist (a, c) and Bode (b, d) plots of X65 steel after immersion in soil extract for different time

Fig.6 Equivalent circuits of X65 steel immersed for different time in soil extract: (a) one time

constant, (b) two time constant

Table 1 EIS fitting parameters of X65 steel after various immersion time in soil extract

Fig.7 Tafel polarization curves of X65 steel after immersion in soil extract for different time

Table 2 Tafel fitted parameters of X65 steel after immersion in soil extract for different time

Fig.8 XRD patterns of X65 steel after immersion in soil extract for 7 d (a) and 28 d (b)

Fig.9 SEM images of X65 steel after immersion in soil extract for 0 d (a), 7 d (b), 14 d (c) and 28 d (d)

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