| SUN Fu-yang,ZHAO Guo-xian,GUO Qing-chao,LI Dan-ping.Effect of Ni-W Alloy Coating on the Corrosion Resistance of QT-900 Coiled Tubing[J],43(6):6-10,15 |
| Effect of Ni-W Alloy Coating on the Corrosion Resistance of QT-900 Coiled Tubing |
| Received:June 30, 2014 Revised:December 10, 2014 |
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| DOI： |
| KeyWord:Ni-W alloy coating QT-900 coiled tubing corrosion resistance |
| Author | Institution |
| SUN Fu-yang |
School of Material Science and Engineering, Xi'an Shiyou University, Xi'an , China |
| ZHAO Guo-xian |
School of Material Science and Engineering, Xi'an Shiyou University, Xi'an , China |
| GUO Qing-chao |
School of Material Science and Engineering, Hebei University of Technology, Tianjin , China |
| LI Dan-ping |
Xi'an Maurer Petroleum Engineering Laboratory Co. , Ltd, Xi'an , China |
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| Abstract: |
| Objective To preliminarily explore the application of Ni-W alloy coating in QT-900 coiled tubing. Methods Ni-W alloy coating was deposited on the surface of QT-900 coiled tubing by DC electrodeposition. An oilfield corrosion environment was simulated by high temperature and high pressure corrosion tests. The effect of Ni-W alloy coating on coiled tubing was studied by comparing the corrosion resistance of Ni-W alloy coating and coiled tubing using analysis methods such as microscopy, SEM and EDS. The effect of Ni-W alloy coating on the corrosion resistance of oil tubing in CO2 medium was studied. Results Ni-W alloy coating mainly consisted of Ni and W elements, and the Fe and Mn contents were low. The average thickness of the coating was 55 μm. The uniform corrosion rate of Ni-W alloy coating was 0. 0160 mm/ a at 60℃, with a CO2 partial pressure of 1. 07 MPa and a tensile stress of 439 MPa, which was 1 /40 of that of the ordinary coiled tubing. The corrosion rate belonged to slight corrosion. Conclusion Ni-W alloy coating had a good resistance to CO2 corrosion. |
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