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Polymer-cement composites with adhesion and re-adhesion (healing) to casing capability for geothermal wellbore applications
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2019-12-20 , DOI: 10.1016/j.cemconcomp.2019.103490
Kenton A. Rod , Carlos A. Fernandez , Manh-Thuong Nguyen , James B. Gardiner , Nicolas J. Huerta , Vassiliki-Alexandra Glezakou , Tamas Varga , Roger Rousseau , Phillip K. Koech

Deterioration of cement/casing adhesion in wellbore scenarios can result in unwanted and potentially harmful leakage with the potential of serious repair costs. In this work, the authors explore the use of self-healing polymers added to conventional wellbore cements as a way to bring about self-healing and readhering (to casing) properties to the composite. Self-healing capability was demonstrated by permeability analysis showing that polymer-cement composites reduce flow by 50-70% at cement bulk and at the cement/steel interface. Use of atomistic simulations imply that these polymers have good wetting properties on the steel surfaces. Interactions between steel/polymer and cement/polymer are complementary, resulting in a wider range of bonding patterns. Cracks seem to expose under-coordinated sites that result in more bonding interactions, which agrees well with the permeability measurements showing high degree of healed cracks and cement-steel interfacial gaps together with an overall increased in structural integrity of these advanced polymer-cement composite materials.



中文翻译:

对地热井筒应用具有粘合和再粘合(修复)能力的聚合物水泥复合材料

井筒中水泥/套管粘结性的恶化会导致不必要的泄漏和潜在的有害泄漏,并可能带来严重的维修成本。在这项工作中,作者探索了将自修复聚合物添加到常规井眼水泥中的方法,从而为复合材料带来自修复和重新粘结(套管)的特性。通过渗透性分析证明了自修复能力,表明聚合物-水泥复合材料在水泥体积和水泥/钢界面处的流动减少了50-70%。原子模拟的使用暗示这些聚合物在钢表面上具有良好的润湿性能。钢/聚合物与水泥/聚合物之间的相互作用是相辅相成的,从而导致了更广泛的粘结方式。裂纹似乎暴露出不协调的位置,从而导致更多的键相互作用,

更新日期:2019-12-20
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