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| Evaluation on Corrosion of Tungsten Alloy Coating in Oilfield |
| Received:April 08, 2019 Revised:June 13, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2019.09.012 |
| KeyWord:tungsten alloy coating corrosion high temperature and high pressure oil tube |
| Author | Institution |
| LIN Guan-fa |
CNPC Key Laboratory for Oil Tubular Goods Engineering, Xi′an , China |
| LEI Dan |
Xi′an Maurer Petroleum Engineering Laboratory Co., Ltd, Xi′an , China |
| HOU Yong-bin |
Oil and Gas Engineering Research Institute, Tarim Oilfield Company, Korle , China |
| SONG Cheng-li |
CNPC Key Laboratory for Oil Tubular Goods Engineering, Xi′an , China |
| CAI Rui |
CNPC Key Laboratory for Oil Tubular Goods Engineering, Xi′an , China |
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| Abstract: |
| Objective To evaluate resistance corrosion of tungsten alloy coating on oil tube. Methods The simulation corrosion tests of the tungsten alloy coating on oil tube were completed under high temperature and high pressure in autoclave, Hydrogen Induced Cracking (HIC) and Hydrogen Sulfide Stress Corrosion (SSC) for the coating oil tube were carried out according to standard test method, and the morphologies and compositions of corrosion product on the coating and the substrate were observed with Scanning Electron Microscope (SEM), Energy Dispersive Spectrometer (EDS) and X-Ray Diffraction (XRD). Results The tungsten alloy coating consisted mainly of W, Ni elements was smooth and dense, the coating after high temperature and pressure corrosion test was still kept the same as that before the test, and light corrosion occurred on the surface of the coating. The corrosion rates of the coatings and the substrate in H2S and CO2 environments at 60 ℃, 90 ℃, 120 ℃ and 140 ℃ for 7 days were respectively 0.0179 mm/a, 0.0093 mm/a, 0.0102 mm/a, 0.0369 mm/a and 1.030 mm/a, 1.272 mm/a, 1.183 mm/a, 0.991 mm/a. The two rates in H2S and CO2 environments at 120 ℃ for 30 days were respectively -0.0085 mm/a and 0.1789 mm/a, the two rates in only CO2 environment at 160 ℃ for 30 days were respectively 0.0091 mm/a and 0.8976 mm/a. The tests of anti-hydrogen induced cracking and anti-hydrogen sulfide stress corrosion were up to standard. Conclusion The tungsten alloy coating has good resistance corrosion. |
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