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为了克服常规低密度水泥浆强度低和漂珠低密度水泥浆在高压下密度上升的缺点 ,通过室内实验研究 ,根据粒度级配原理 ,以蛭石为主要减轻材料、辅以其它硅质材料 ,开发出密度 1.35～ 1.5 0 g/cm3 的低密度水泥浆体系。室内实验研究表明 :该水泥浆体系流变性能、滤失性能良好 ,且有一定的膨胀性能 ,适于低压易漏地层固井。通过扫描电镜和X衍射等方法 ,研究了蛭石对水泥水化结晶的影响 ,分析了其作用机理。
In order to overcome the shortcomings of low density cement paste and low density cement paste, the density of floating low density cement paste increases under high pressure. According to the particle size grading principle, vermiculite is the main reducing material, supplemented by other siliceous materials, Developed low density cement slurry system with density of 1.35 ~ 1.5 0 g / cm3. Laboratory experiments show that: the rheological properties of the cement slurry system, good filtration performance, and have some swelling properties, suitable for low pressure easy to leak formation cementing. The effects of vermiculite on hydration and crystallization of cement were studied by scanning electron microscopy and X-ray diffraction. The mechanism of action was also analyzed.