微硅低密度固井水泥浆力学强度发展规律研究

Research on the Development Rule of Mechanical Strength of Silica Fume Low-density Cement Slurry

固井水泥浆的抗压强度对于评价固井质量至关重要,针对不同微硅掺量与水泥石抗压强度之间的关系展开研究对水泥浆力学强度的发展和预测具有重要的现实意义。探讨了不同掺量微硅对水泥浆力学强度发展的影响规律,结合CT和SEM对对微硅低密度水泥浆的强度发展机理进行了探讨。研究结果表明:微硅对低密度水泥浆的力学强度的发展具有明显的促进作用,微硅掺量越高,促进作用越明显,且随水化龄期的增长,促进效果越显著。抗压强度与微硅掺量具有良好的线性关系,采用该模型可以快速计算水泥石抗压强度,从而可为水泥浆配方推荐和固井现场施工提供参考。

The compressive strength of cement slurry is very important for evaluating the cementing quality. It is of great practical significance to study the relationship between different content of silica fume and the compressive strength of cement stone for the development and prediction of the mechanical strength of cement slurry. In this paper, the influence of different amounts of silica fume on the development of mechanical strength of cement slurry was discussed, and the strength development mechanism of silica fume low-density cement slurry was analyzed in combination with CT and SEM. The research results showed that silica fume had significant effect on the development of mechanical strength of low-density cement slurry. The compressive strength had a good linear relationship with the content of silica fume. Using this model, the compressive strength of cement stone could be quickly calculated, providing reference for cement slurry formulation recommendation and cementing site construction.