基于分形理论的低热早强固井水泥浆体系研究

A Low Hydration Heat and Early Strength Cement Slurry System Based on Fractal Theory

天然气水合物在全球分布广泛,具有极高的资源价值和广阔的开发前景,是未来深水开发的热点。本文针对天然气水合物地层固井的特殊要求,利用分形特征方程和自主研发的相变微胶囊材料,构建了一套低热早强固井水泥浆体系。室内实验结果表明,基于分形特征方程设计的固井水泥浆体系具有低温条件下抗压强度高的特点,并且加入的相变微胶囊材料能较好地吸收水泥浆的水化热,有效降低温度上升速度和削弱温度峰值,从而降低水泥浆水化放热量,能够满足深水低温条件下天然气水合物地层的固井要求。

Natural gas hydrate is widely distributed in the world and has broad development prospects.Aiming at the special requirements of natural gas hydrate layer cementing,a set of low-heat early strength cement slurry system is constructed by using the fractal characteristic equation and the self-developed phase change microcapsule material.The results of experiments show that the cement slurry system designed by the fractal characteristic equation has the characteristics of high compressive strength under low temperature conditions,and the phase change microcapsule material can absorb the hydration heat.With the reducing of the temperature rising speed and the weakening of the peak,the hydration heat release of the cement slurry falls obviously,which can meet the cementing requirements of the natural gas hydrate layer under deep water low temperature conditions.