The Influence of Calcium-Based Whisker Self-Healing Agent on Self-Healing of Oil Well Set Cement Cracks in CCUS Wells
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摘要: 固井水泥环在碳捕集、利用和封存（CCUS）井下易发生化学损伤，降低其服役寿命，因此进行了利用钙基晶须自修复剂与CO2反应诱导生成CaCO3，来提升固井水泥环自修复能力的研究。通过力学试验仪、X射线衍射仪、热重分析仪、扫描电子显微镜和工业用计算机断层成像等测试仪器，研究钙基晶须自修复剂对固井水泥环自修复过程的影响。力学性能测试结果显示，自修复28 d后，掺入钙基晶须自修复剂的水泥石抗压强度自修复率为83.87%，比未掺的水泥石高90.31%。物相分析和扫描电镜测试结果表明，在自修复材料周围有大量方解石型碳酸钙晶体生成，并沉积在水泥石的裂缝中，使得水泥石的裂缝发生碳化自修复。利用CT测试结果进一步证实了钙基晶须自修复剂的自修复效果，掺入钙基晶须自修复剂的水泥环自修复28 d后裂缝体积减小4165.95 mm3，自修复率达到72.32%，这表明CCUS井环境下，在固井水泥浆中掺入钙基晶须自修复材料对水泥环的碳化自修复过程有积极影响。Abstract: In wells for carbon capture, utilization and storage (CCUS), cement sheaths are easy to get chemically damaged, hence reducing their service life. A study was conducted to enhance the self-healing capacity of cement sheaths by reacting calcium-based whisker self-healing agent with CO2 to produce CaCO3. The influence of calcium-based whisker self-healing agent on the self-healing process of cement sheaths was studied using mechanical tester, X-ray diffractometer (XRD), thermogravimetric analyzer (TGA), scanning electron microscope (SEM) and industrial computed tomography (CT) etc. The results of mechanical performance tests showed that after 28 days of self-healing, the self-healing rate of the compressive strength of the set cement incorporated with the calcium-based whisker reached 83.87%, which is 90.31% higher than that of the set cement without incorporating calcium-based whisker. Phase analysis and SEM observation results show that a large number of calcite-type calcium carbonate crystals were generated around the self-healing material and deposited in the cracks of the set cement, thereby rendering the cracks in the set cement carbonized self-healing. CT test results further confirmed the self-healing effect of the calcium-based whisker self-healing agent; after 28 days of self-healing, the volume of the cracks in the set cement incorporated with the calcium-based whisker self-healing agent was reduced by 4,165.95 mm3, a self-healing rate of 72.32%. This indicates that in the CCUS well environment, the incorporation of calcium-based whisker self-healing materials into a cement slurry has a positive impact on the carbonized self-healing process of the cement sheath.
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Key words:
- Calcium-based whisker /
- CCUS /
- Carbonized self-healing /
- Cement sheath
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