Pitting Corrosion and Microstructure of J55 Carbon Steel Exposed to CO2/Crude Oil/Brine Solution under 2-15 MPa at 30-80 °C
Pitting Corrosion and Microstructure of J55 Carbon Steel Exposed to CO2/Crude Oil/Brine Solution under 2-15 MPa at 30-80 °C
复制标题
J55碳钢在2～15 MPa、30～80℃下暴露于CO2/原油/盐水溶液中的点蚀和显微组织
DOI：
10.3390/ma11122374
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发表时间：
2018-12-01
期刊：
影响因子：
3.4
通讯作者：
Zhang, Ningsheng
中科院分区：
文献类型：
--
作者：
Bai, Haitao;Wang, Yongqing;Zhang, Ningsheng
研究了J55碳钢在CO2驱威尔斯井眼CO2/原油/盐水混合液中的腐蚀性能。确定了井筒的主要腐蚀部位，并给出了井筒腐蚀规律。在模拟不同井深（0-1500 m）的温度（30-80 ℃）和压力（2-15 MPa）条件下，在30%原油/盐水溶液中进行腐蚀试验。通过失重测量和表面分析技术（包括扫描电子显微镜、能谱仪、X射线衍射分析和光学数字显微镜）评估了J55碳钢的腐蚀行为。腐蚀速率随井深的增加先增大后减小，在1050 m处达到最大值。在这个井深，压力和温度分别达到11 MPa和65 ℃。在这些条件下，FeCO 3和CaCO 3定位在样品表面上。采用显微镜观察了试样表面的腐蚀深度分布。
This study aimed to evaluate the corrosion properties of J55 carbon steel immersed in CO2/crude oil/brine mixtures present in the wellbores of CO2-flooded production wells. The main corroded position of wellbore was determined and wellbore corrosion law was provided. Corrosion tests were performed in 30% crude oil/brine solution under the simulated temperature (30-80 degrees C) and pressure (2-15 MPa) conditions of different well depths (0-1500 m). The corrosion behavior of J55 carbon steel was evaluated through weight-loss measurements and surface analytical techniques, including scanning electron microscopy, energy dispersive spectrometer, X-ray diffraction analysis, and optical digital microscopy. Corrosion rate initially increased and then decreased with increasing well depth, which reached the maximum value of 1050 m. At this well depth, pressure and temperature reached 11 MPa and 65 degrees C, respectively. Under these conditions, FeCO3 and CaCO3 localized on sample surfaces. Microscopy was performed to investigate corrosion depth distribution on the surfaces of the samples.