Rheological properties of oil well cement slurries
Rheological properties of oil well cement slurries
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DOI：
10.1680/coma.2012.165.1.25
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发表时间：
2012-02-01
影响因子：
1.5
通讯作者：
Nehdi, Moncef L.
中科院分区：
文献类型：
--
作者：
Shahriar, Anjuman;Nehdi, Moncef L.
采用先进的剪切应力/剪切应变控制流变仪，在23 ~ 60 ℃温度范围内研究了6种不同化学外加剂的油井水泥浆的流变性能，包括屈服应力、塑性粘度、触变性和胶凝强度。探讨了粘结剂与化学外加剂的相容性和相互作用。本研究的目的是有效地使用化学外加剂，以开发具有令人满意的性能的水泥浆，以克服在油井固井中遇到的困难，如和易性的快速损失，泵送问题，水泥水化加速，混合水的快速蒸发和层间隔离。结果表明，油井水泥浆的流变性能与温度、水灰比和外加剂类型密切相关。温度和化学外加剂的耦合效应对浆料的流动性能有实质性的影响。在所用的六种外加剂中，新一代聚羧酸盐基高效减水剂（PCH）被发现在所有测试温度下都能更有效地改善油井水泥浆的流变性能。
The rheological properties, including yield stress, plastic viscosity, thixotropy and gel strength of oil well cement slurries incorporating six different chemical admixtures were investigated at different temperatures in the range of 23 to 60 degrees C using an advanced shear-stress/shear-strain controlled rheometer. The compatibility and interactions between the binder and chemical admixtures were explored. The aim of the present study was to effectively use chemical admixtures to develop slurries with satisfactory properties in order to overcome difficulties encountered in oil well cementing such as the rapid loss of workability, pumping problems, acceleration of cement hydration, fast evaporation of mixing water and zonal isolation. It was found that the rheological properties of oil well cement slurries are highly dependent on temperature, water/cement ratio and the type of admixture used. Coupled effects of temperature and chemical admixtures had a substantial effect on the flow properties of the slurries. Among the six admixtures used, the new generation polycarboxylate-based high-range, water-reducing admixture (PCH) was found to be more effective in improving the rheological properties of oil well cement slurries at all test temperatures.