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首页> 美国政府科技报告 >Treated Ceramic Microsphere-Cement Lightweight Composites for Geothermal Cementing Systems
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Treated Ceramic Microsphere-Cement Lightweight Composites for Geothermal Cementing Systems

机译：用于地热固井系统的处理陶瓷微球 - 水泥轻质复合材料

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The compressive strength and water permeability of high-temperature light-weight cementing materials containing sillimanite-based hollow microspheres as a filler can be improved by treating the surfaces of the microspheres with a Ca(OH) sub 2 -saturated solution at temperatures up to 200 sup 0 C. The precipitation of an epitaxial layer formed by an interaction between a hot calcium hydroxide solution and the surface of the sphere plays an essential role in developing favorable bonding characteristics at the interfaces and in promoting the hydration of the cement matrix. The properties of the composites include a slurry density of <1.2 g/cc at 25 sup 0 C, a 300 sup 0 C-24 hour compressive strength of >1015 psi (7.0 MPa), a water permeability of <10 sup -4 Darcy, and a bulk density of <1.0 g/cc. It was observed that tobermorite-truscottite transformation and anorthite formation during autoclave exposure for 180 days in brine at 300 sup 0 C results in slight strength reductions and increased water permeability. (ERA citation 13:003282)

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