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利用扫描电子显微镜、强度测试仪检测了不同条件下二氧化碳腐蚀油井水泥的产物、微观结构及抗压强度,研究了二氧化碳腐蚀油井水泥的机理及腐蚀对水泥强度的影响,分析和评价出了适合于大庆油田不同温度深井条件的水泥浆体系。结果表明:二氧化碳对油井水泥的腐蚀作用本质在于二氧化碳能够与水泥的水化产物发生化学作用,生成了各种不同晶体结构的CaCO3产物,使原有的水泥石微观结构遭到破坏,导致腐蚀后水泥石的强度下降;温度和二氧化碳分压增高;改善水泥石抗腐蚀能力应以有效改善水泥水化产物及微观结构为基础,添加抗腐蚀填充材料能有效改善水泥浆体系的抗腐蚀能力。
The microstructure and compressive strength of oil well cement with carbon dioxide corrosion under different conditions were examined by scanning electron microscope and intensity tester. The mechanism of corrosion of oil well cement with carbon dioxide and the effect of corrosion on cement strength were studied. Cement slurry system of deep well under different temperature in Daqing Oilfield. The results show that the corrosive effect of CO2 on oil well cement is that the carbon dioxide can chemically react with the hydration products of cement and generate various CaCO3 products with different crystal structures to destroy the original cement stone microstructure and cause corrosion The strength of cement stone decreases; the temperature and the partial pressure of carbon dioxide increase; improving the anti-corrosion ability of cement stone should be based on effectively improving the cement hydration products and microstructure. Adding anti-corrosion filler can effectively improve the corrosion resistance of the cement slurry system.