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作 者:李明[1] 刘萌[1] 杨元意[1] 李早元[2] 郭小阳[2]
机构地区:[1]西南石油大学材料科学与工程学院 [2]"油气藏地质及开发工程"国家重点实验室(西南石油大学)
出 处:《石油勘探与开发》2015年第1期94-100,共7页Petroleum Exploration and Development
基 金:国家重点基础研究发展规划(973)项目"页岩气水平井钻完井关键基础研究"(2013CB228003);油气藏地质及开发工程国家重点实验室(西南石油大学)资助项目(PLN1213)
摘 要:针对油井水泥石易脆裂而造成油气井层间封隔失效的问题,通过实验研究了碳纤维、碳酸钙晶须及二者混杂对油井水泥石力学性能的影响,利用扫描电镜观察了水泥石微观形貌,并探讨混杂纤维增强水泥石的作用机理。实验结果表明:碳纤维、碳酸钙晶须及两者混杂纤维均能有效提高水泥石的抗压、抗折和劈裂抗拉强度;相对于单掺1种纤维,混杂纤维对水泥石的增强效果更好;混杂纤维水泥石具有明显的韧性,且混杂纤维显著提高了水泥石的力学形变能力。观察水泥石微观形貌和分析混杂纤维增韧机理后发现:碳酸钙晶须和碳纤维具有不同的尺寸、形貌和性能,能够在不同结构层次和荷载阶段发挥作用,控制微裂纹或裂缝的产生和发展,改善水泥石的强度和韧性。To decrease the brittleness of oil well cement stone, the effects of carbon fiber, calcium carbonate whisker and hybrid fiber of them on mechanical prosperities of the cement stone were studied by experiments. The microstructures and micromechanical behaviors of the cement stone were investigated using scanning electron microscopy. The strengthening and toughening mechanisms of hybrid fiber were discussed. The experimental results show that: the compressive, fiexural, split tensile strengths of the cement stone can be improved effectively with each of carbon fiber, calcium carbonate whisker and hybrid fiber; compared with adding a single fiber, the hybrid fiber can strengthen the cement stone better; the mechanical deformation capacity of the cement stone added the hybrid fiber is significantly improved, and the cement stone shows obvious toughness. Observing the microstructures and micromechanical behaviors of the cement stone and analyzing the reinforcement mechanism of hybrid fiber reveal that, the calcium carbonate whisker and carbon fiber have different sizes, morphologies and performances, which can work in different structure levels and loading stages, controlling generation and development of microcracks and fractures and improving the strength and toughness of the cement stone.
分 类 号:TE256[石油与天然气工程—油气井工程]
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