硅砂对稠油热采井水泥石强度影响的室内试验

为了满足稠油热采对固井水泥石的要求,模拟稠油热采固井水泥常温凝固、高温热采这一特殊的地层环境,先将水泥浆在70℃下常压养护3d后再进行高温高压养护。通过研究不同热采温度下硅砂粒径对水泥石强度发展的影响,以及不同钙硅比在不同的高温梯度下对油井水泥石强度衰退的影响,从机理上阐述了硅砂粒径及钙硅比能提高硅酸盐水泥石强度和热稳定性的原因,找到了最佳的硅砂粒径和合适的钙硅比,为进一步选择和设计稠油固井水泥浆体系提供了依据,对稠油油藏的开发开采具有重要意义。

Laboratory study on grain size of silica in strength recession of heavy oil thermal recovery cement

In order to meet the requirements of heavy oil thermal recovery on cementing cement, this simulation of heavy oil thermal recovery well cement at room temperature solidification, high-temperature thermal recovery of the formation of this special environment, first slurry at atmospheric pressure at 70 ℃ for three days later by a thermal temperature and pressure conservation. In this paper studies at different high temperatures silica sand grain size on the impact of cement strength development as well as the different Ca/Si ratio on impact of the recession of well cement at different high temperature gradient, described the reason that the silica sand grain size and Ca/Si ratio can improve the strength and thermal stability of cement, found the best silica sand grain size and Ca/Si ratio from the mechanism. The studies have an important guiding significance in heavy oil recovery and develop. What is more, it provides a basis for further selection and design of heavy oil slurry system.