| 何松,王贝,冯桓榰,路民旭,周定照,邢希金.S13Cr在超高温超临界CO2环境下的腐蚀行为及产物膜特征[J].装备环境工程,2021,18(1):8-14. HE Song,WANG Bei,FENG Huan-zhi,LU Min-xu,ZHOU Ding-zhao,XING Xi-jin.Corrosion Behavior and Film Characteristics of S13Cr Stainless Steel under Ultra-High-Temperature Supercritical CO2 Environment[J].Equipment Environmental Engineering,2021,18(1):8-14. |
| S13Cr在超高温超临界CO2环境下的腐蚀行为及产物膜特征 |
| Corrosion Behavior and Film Characteristics of S13Cr Stainless Steel under Ultra-High-Temperature Supercritical CO2 Environment |
| 投稿时间：2020-09-29 修订日期：2020-11-25 |
| DOI：10.7643/issn.1672-9242.2021.01.002 |
| 中文关键词: 超级13Cr 超临界CO2 H2S 高温高压 腐蚀 油套管中图分类号:TG172 文献标识码:A 文章编号:1672-9242(2021)01-0008-07 |
| 英文关键词:S13Cr stainless steel supercritical CO2 H2S HTHP corrosion casing and tubing |
| 基金项目:博士后基金(2019M660454)；渤中19-6凝析气田开发钻完井关键技术研究及应用-Ⅰ期(YXKY-2020-TJ-03) |
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| Author | Institution |
| HE Song | CNOOC Research Institute Co., Ltd., Beijing 100028, China |
| WANG Bei | University of Science & Technology Beijing, Beijing 100083, China |
| FENG Huan-zhi | CNOOC Research Institute Co., Ltd., Beijing 100028, China |
| LU Min-xu | University of Science & Technology Beijing, Beijing 100083, China |
| ZHOU Ding-zhao | CNOOC Research Institute Co., Ltd., Beijing 100028, China |
| XING Xi-jin | CNOOC Research Institute Co., Ltd., Beijing 100028, China |
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| 中文摘要: |
| 目的 明确超级13Cr在超高温超临界CO2环境下的适用性、耐蚀性及腐蚀产物膜特征。方法 采用高温高压反应釜模拟气井井底超高温超临界CO2腐蚀工况，采用腐蚀失重法获取腐蚀速率，结合扫描电子显微镜(SEM)、能谱(EDS)及X射线衍射仪(XRD)对腐蚀产物特性进行分析研究。结果 在215 ℃、31.2 MPa CO2分压、7.24 kPa H2S分压下，超级13Cr在含饱和水的超临界相中及含饱和CO2的模拟凝析水相中均呈现均匀腐蚀特征，腐蚀速率分别为0.009 mm/a及0.126 mm/a。腐蚀受CO2-H2S共同控制。腐蚀产物呈双层结构，内层腐蚀产物以碳酸亚铁为主，外层以磁黄铁矿为主，且内外两层腐蚀产物膜结合较弱，易剥离。超临界相中，内外层腐蚀产物膜均较为稀疏，水相区内外层腐蚀产物膜更为致密，但外层腐蚀产物膜容易发生破裂剥落。结论 以0.125 mm/a作为油套管选材标准，对于仅含凝析水、无积水问题的气井，可选用超级13Cr作为油套管材质(温度≤215 ℃，CO2分压≤31.2 MPa，H2S分压≤7.24 kPa，Cl–质量浓度≤4646 mg/L)，但对于井底有比较严重积水问题的气井，或者含水率较高的油井，超级13Cr并不适合。 |
| 英文摘要: |
| To clarify the applicability, corrosion resistance and correction film characteristics of S13Cr stainless steel under ultra-high-temperature supercritical CO2 environment, HTHP reactor was adopted to simulate the ultra-high-temperature supercritical CO2 environment at the bottom of gas well. The corrosion rate was measured by correction weight loss methods; the corrosion film characteristics were analyzed by the scanning electron microscope (SEM), energy spectrum (EDS), and X-ray diffraction (XRD). The results show that S13Cr steel presents uniform corrosion characteristics in the supercritical phase containing saturated water and condensate water phase containing saturated CO2, with corrosion rates of 0.009 mm/a and 0.126 mm/a respectively at 215 ℃, 31.2 MPa CO2 partial pressure, and 7.24 kPa H2S partial pressure. Both CO2 and H2S control corrosion. Corrosion film is a double-layer structure. The inner corrosion film is mainly FeCO3; the outer film is mainly pyrrhotite. The binding force between the inner and outer films is weak, so they are easy to flake off. The corrosion film in the supercritical phase is relatively sparse, while that in the water phase is much denser, but the outer film is prone to crack and flack off. Taking 0.125 mm/a as the casing and tubing material selection standard, S13Cr can be selected as casing and tubing material for gas wells with only condensate water and without water accumulation (temperature≤215 ℃, ≤31.2 MPa, ≤7.24 kPa, Cl–≤4646 mg/L). However, S13Cr is not suitable for such too severe working conditions if there is serious water accumulation at the bottom of the well or oil wells with high water content. |
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