不同材质油套管钢在CO2/H2S共存环境下的腐蚀行为及机理研究

刘婉颖; 张宁好; 张智; 丁思艺; 任传谱; 林泽洋; 苟德成; 李磊

doi:10.16490/j.cnki.issn.1001-3660.2025.18.004

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表面技术 ›› 2025, Vol. 54 ›› Issue (18) : 37-45. DOI: 10.16490/j.cnki.issn.1001-3660.2025.18.004

腐蚀与防护

不同材质油套管钢在CO₂/H₂S共存环境下的腐蚀行为及机理研究

刘婉颖^a,*, 张宁好^a, 张智^b, 丁思艺^a, 任传谱^a, 林泽洋^a, 苟德成^a, 李磊^a

作者信息 +

Corrosion Behavior and Mechanism of Oil Casing Steel of Different Materials in CO₂/H₂S Coexistence Environment

LIU Wanying^a,*, ZHANG Ninghao^a, ZHANG Zhi^b, DING Siyi^a, REN Chuanpu^a, LIN Zeyang^a, GOU Decheng^a, LI Lei^a

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摘要

目的管材腐蚀失效是影响储气库安全性的关键因素,针对储气库CO₂/H₂S共存环境下的腐蚀规律,研究不同材质油套管的腐蚀行为及机理。方法利用自研自制的高温高压釜对5种不同材质油套管在温度80 ℃,0.327 MPa CO₂分压,0.038 MPa H₂S分压,2 m/s流体流速条件下开展周期336 h的动态失重腐蚀实验。采用XRD、SEM、EDS、白光干涉仪等技术手段研究5种不同材质油套管在CO₂/H₂S共存环境下的腐蚀行为特征。结果 80S-5Cr均匀腐蚀速率最小,为0.049 8 mm/a,按照腐蚀等级标准,5种管材均匀腐蚀速率均很小,发生中度腐蚀。就点腐蚀而言,90S-3Cr点蚀速率最小,为0.177 1 mm/a,其蚀坑深度最浅,为6.792 5 μm。90S-3Cr为中度腐蚀,80S-5Cr、80S-3Cr、80S为严重腐蚀,90S为极严重腐蚀。结论 80S-5Cr综合性能最优异,元素Cr有利于提高抗腐蚀性能。本研究为储气库井下CO₂/H₂S共存环境油套管管材选择提供了理论依据。

Abstract

Pipe corrosion failure is a key factor affecting the safety of gas storage facilities. The work aims to explore the corrosion behavior and mechanism of five types of oil casing pipes, namely 80S, 80S-3Cr, 80S-5Cr, 90S, and 90S-3Cr, based on the corrosion laws in the coexistent CO₂/H₂S environment of gas storage facilities, so as to optimize the oil casing steels resistant to corrosion by carbon dioxide and hydrogen sulfide.
The steels of the five types of oil casing pipes were respectively cut into three rectangular specimens with dimensions of 30.0 mm×15.0 mm×2.8 mm. These specimens were polished smoothly with water-sandpaper and then cleaned and dried. A multi-phase flow dynamic circulation high-temperature and high-pressure reactor independently developed by the research group was used to simulate the working environment with coexistent CO₂ and H₂S in the gas storage facility. The prepared specimens were fixed inside the reactor body. The prepared simulated formation water solution was added into the reactor. All valves were closed, and N₂ was introduced for 2-4 hours to remove oxygen. Then, CO₂ was introduced to expel the nitrogen in the reactor. During the experiment, the temperature was maintained at 80 ℃, and the total pressure in the reactor was controlled at 38 MPa. The rotational speed of the electric motor was set according to a flow velocity of 2 m/s on the surface of the pipe material. The stirring device was started, 0.038 MPa of H₂S and 0.327 MPa of CO₂ were introduced, and the timing was started. The experimental cycle was 336 hours. Subsequently, an EVO MA15 scanning electron microscope was employed to observe the micro-morphology of the specimen surfaces before and after the removal of corrosion products. The chemical components of the corrosion products were analyzed with the built-in Oxford energy- dispersive spectrometer. An X'Per 3 MRD X-ray diffractometer was used to analyze the phase structure and phase composition of the surface corrosion products. A white-light interferometer was used to analyze the three-dimensional morphology of the specimen surfaces after the removal of corrosion products and measure the depth of the corrosion pits.
The 80S-5Cr had the minimum uniform corrosion rate of 0.049 8 mm/a. According to the corrosion grade standard, the uniform corrosion rates of the five types of pipes were all low, and they all suffered from moderate corrosion. In terms of pitting corrosion, the 90S-3Cr had the minimum pitting corrosion rate of 0.177 1 mm/a, and its corrosion pit depth was the shallowest, at 6.792 5 μm. The 90S-3Cr was moderately corroded, while 80S-5Cr, 80S-3Cr, and 80S were severely corroded, and 90S was extremely severely corroded. The 80S-5Cr had the most excellent comprehensive performance. The chromium deposition on the surface of the Cr-containing steel formed a surface layer, which reduced the corrosion rate of the oil casing pipes. Moreover, as the Cr content increased, the corrosion resistance of the pipes gradually improved. This research provides a theoretical basis for the selection of oil casing pipes in the coexistent CO₂/H₂S environment in the underground of gas storage facilities.

导出引用

刘婉颖, 张宁好, 张智, 丁思艺, 任传谱, 林泽洋, 苟德成, 李磊. 不同材质油套管钢在CO₂/H₂S共存环境下的腐蚀行为及机理研究[J]. 表面技术. 2025, 54(18): 37-45 https://doi.org/10.16490/j.cnki.issn.1001-3660.2025.18.004

LIU Wanying, ZHANG Ninghao, ZHANG Zhi, DING Siyi, REN Chuanpu, LIN Zeyang, GOU Decheng, LI Lei. Corrosion Behavior and Mechanism of Oil Casing Steel of Different Materials in CO₂/H₂S Coexistence Environment[J]. Surface Technology. 2025, 54(18): 37-45 https://doi.org/10.16490/j.cnki.issn.1001-3660.2025.18.004

中图分类号： TG172

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