- 中国核心期刊（遴选）数据库收录期刊
- 中国科技论文统计源期刊
- 中国学术期刊综合评价数据库来源期刊
| Citation: |
DONG Shexia, CHENG Wenjia, JIN Haonan, ZHAO Yulong, LIN Xueqiang. Corrosion Behavior of 20CrNiMo steel and 20CrMnMo Steel for Packer Slips under Downhole Conditions in an Oil Field[J]. Corrosion & Protection, 2024, 45(11): 1-7. DOI: 10.11973/fsyfh220476
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Corrosion tests were conducted on 20CrMnMo steel and 20CrNiMo steel for packer slip in the high-temperature, high-pressure and CO2/H2S environment simulating deep/ultra deep well conditions. The corrosion behavior of the two materials were compared and studied by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical testing. The results show that under the simulated deep/ultra deep well conditions, the corrosion form of 20CrMnMo steel was typical general corrosion, while the corrosion form of 20CrNiMo steel was pitting corrosion. The corrosion products on the surfaces of the two materials had a double-layer structure, and the outer corrosion products were composed of loose flocculent FeS and granular FeCO3. The inner corrosion product of 20CrNiMo steel was composed of FeCO3, while the inner corrosion product of 20CrMnMo steel had a small amount of Cr(OH)3 in addition to FeCO3. The existence of Cr(OH)3 could effectively improve the protection of the inner corrosion product film of 20CrMnMo steel, so that the corrosion resistance of the steel was obviously better than that of 20CrNiMo steel.
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