张晓诚,林海,谢涛,汤柏松,闫伟.含铬油套管钢材在CO2和微量H2S共存环境中的腐蚀规律[J].表面技术,2022,51(9):197-205, 216.
ZHANG Xiao-cheng,LIN Hai,XIE Tao,TANG Bai-song,YAN Wei.Corrosion Law of Oil Casing Steel Containing Cr in CO2 and Trace H2S Environment[J].Surface Technology,2022,51(9):197-205, 216 |
| 含铬油套管钢材在CO2和微量H2S共存环境中的腐蚀规律 |
| Corrosion Law of Oil Casing Steel Containing Cr in CO2 and Trace H2S Environment |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.09.020 |
| 中文关键词: 含Cr油套管 CO2腐蚀 H2S腐蚀 产物膜 点蚀 应力腐蚀 |
| 英文关键词:oil casing steel CO2 corrosion H2S corrosion product film pitting corrosion stress corrosion |
| 基金项目:国家重大科技专项(2016ZX05058–002) |
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| Author | Institution |
| ZHANG Xiao-cheng | Tianjin Branch of CNOOC China Limited, Tianjin 300459, China |
| LIN Hai | Tianjin Branch of CNOOC China Limited, Tianjin 300459, China |
| XIE Tao | Tianjin Branch of CNOOC China Limited, Tianjin 300459, China |
| TANG Bai-song | Tianjin Branch of CNOOC China Limited, Tianjin 300459, China |
| YAN Wei | State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum Beijing, Beijing 102249, China |
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| 中文摘要: |
| 目的 研究不同含铬材质钢在CO2和微量H2S共存环境中的腐蚀行为，优化深井油套管抗腐蚀设计方案。方法 以实际油水分离的水样为腐蚀介质进行模拟实验，采用高温高压反应釜、扫描电子显微镜(SEM)和X射线能谱仪(EDS)，揭示4种含铬材质钢在不同腐蚀环境中的腐蚀速率、腐蚀产物膜及应力腐蚀开裂特征，并建立高CO2与微量H2S共存环境下油套管防腐选材优化设计方法。结果 在高分压比条件下均发生了由CO2主导的腐蚀反应，腐蚀产物以FeCO3为主，加入微量H2S后低Cr材质产物膜的附着力较低，出现了疏松脱落现象，FeS优先成膜，含铬钢表面的腐蚀产物膜呈现“富铬”现象，膜的保护性能得到改善。3种腐蚀环境中3Cr钢对应的腐蚀速率分别为1.965 3、1.736 1、1.159 2 mm/a，均处于极严重程度，且表面出现了局部沟槽;9Cr钢的产物膜轻微覆盖，腐蚀较轻，13Cr和S13Cr基本无产物膜覆盖，未发生腐蚀。9Cr、13Cr和S13Cr在加载90%的屈服应力时均未发生应力腐蚀开裂，应力腐蚀敏感性较低。结论 含铬钢具有良好的抗腐蚀性能，基于腐蚀环境特点提出了井筒分段防腐选材设计方案“9Cr+13Cr+超级13Cr”，有效降低了防腐成本，研究结果对CO2和微量H2S共存环境中含Cr钢腐蚀特征和优化选材提供了理论依据。 |
| 英文摘要: |
| The work aims to study the corrosion behavior of different steels containing chromium in the coexistence environment of CO2 and trace H2S and optimize the anti-corrosion design scheme of oil casing in deep wells.The water sample actually separated from oil was used as the corrosion medium to carry out simulation experiments by HTHP autoclave, SEM and EDS technology to reveal the corrosion rate, corrosion product film and characteristics of stress corrosion cracking of four chromium-containing steels in different corrosion environments and establish the optimization design method of oil casing anti-corrosion material selection in the coexistence environment of high CO2 and trace H2S. CO2 dominated corrosion reaction under the condition of high pressure ratio, and the corrosion product was mainly FeCO3. After the addition of trace H2S, the adhesion of the product film of low Cr material was low, resulting in looseness and falling, and FeS was preferentially formed. The corrosion product film on the surface of steels containing chromium presented the "chromium enrichment", which improved the protection of the film. The corresponding corrosion rates of 3Cr steel in the three corrosion environments were 1.965 3, 1.736 1 and 1.159 2 mm/a respectively, which were in a very serious degree, and local grooves appeared on the surface. The product film of 9Cr steel was slightly covered and the corrosion was light. 13Cr and S13Cr had almost no product film coverage, and the corrosion hardly occurred. There was no stress corrosion cracking when 9Cr, 13Cr and S13Cr were loaded with 90% yield stress, and the stress corrosion sensitivity was low. Steel containing chromium has good corrosion resistance, the design scheme of shaft section anti-corrosion material selection 9Cr + 13Cr + Super 13Cr is proposed based on the characteristics of corrosive environment, which effectively reduces the anti-corrosion cost. The research results provide a theoretical basis for the corrosion characteristics and optimal material selection of steel containing chromium in the coexistence environment of CO2 and trace H2S. |
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