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首页> 外文会议>Geothermal Resources Council annual meeting >Use of Fly Ash and Metakaolin in Wellbore Cementing to Prevent Alkali-Silica Reactivity of Amorphous Si-rich Components
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Use of Fly Ash and Metakaolin in Wellbore Cementing to Prevent Alkali-Silica Reactivity of Amorphous Si-rich Components

机译：粉煤灰和偏高岭土在井眼固井中的使用，以防止非晶态富硅组分的碱-硅反应性

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This study looks at the effects of metakaolin (MK) and fly ash (FA) on alkali-silica reaction (ASR) prevention as well as mechanical and petrophysical properties of light-weight wellbore cement containing silica-based microspheres. The helium gas porosimeter and liquid pulse decay permeameter was used to determine the porosity and permeability of samples respectively. Micro-indentation was used to determine Young's modules and Hardness values, and Scanning Electron Microscopy was used to visualize the microstructural changes. The cement petrophysical properties are enhanced by addition of MK and FA, observed in permeability and porosity reduction, as well as in more dense microstructures. Final conclusions show that both metakaolin and fly ash can prevent reactivity of glass based microspheres in light weight wellbore cement, but metakaolin is more effective in doing so.
机译：这项研究着眼于偏高岭土（MK）和粉煤灰（FA）对防止碱-二氧化硅反应（ASR）以及含有二氧化硅基微球的轻质井筒水泥的力学性能和岩石物理性能的影响。用氦气孔隙率仪和液体脉冲衰减渗透仪分别测定样品的孔隙率和渗透率。显微压痕用于确定杨氏模量和硬度值，而扫描电子显微镜则用于可视化显微结构变化。在渗透率和孔隙率降低以及更致密的微观结构中观察到，通过添加MK和FA可以增强水泥的岩石物理特性。最终结论表明，偏高岭土和粉煤灰均可以防止轻质井眼水泥中玻璃基微球的反应，但偏高岭土在此方面更有效。

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