机械振动水泥浆是振动固井施工中常见的作业方式,可以有效提高固井质量。借助机械振动实验系统和研发的新型水泥石试件制备模具,研究了机械振动对水泥浆各项性能的影响规律。实验结果表明:机械振动在振幅2.2 mm,振动时间5 min,振动频率6~21 Hz的参数范围内,水泥浆流性指数提高7.20%,稠度系数下降23.47%,不仅极大程度地改善水泥浆的流变特性,并将静胶凝强度过渡时间和凝结时间分别缩减7.89%和5.65%,水泥石抗压强度提升12.43%;振动后水泥浆体系的均质性和稳定性会受到扰动,其水泥石强度的波动幅度约为振动前的6.62倍,并初步确定了振动波作用的最佳范围应是处于激振点与远端的中间位置,为机械式振动固井技术的应用提供一定的理论依据及数据参考。

It’s a common operation method in vibration cementing to oscillate cement slurry by mechanical means.And the method could improve the cementing quality effectively.In this paper, the mechanical vibration experiment system is used to study the effect of vibration on the properties of the cement slurry.The experimental results show that the mechanical vibration can improve the properties of the cement slurry significantly under the vibration frequency range of 6~21Hz, amplitude of 2.2mm and vibration duration of 5min.The fluidity index of the cement slurry increases by 7.20% and the consistency coefficient decreases by 23.47%.The rheological properties of the cement slurry are greatly improved, and the transition time and setting time of the static gel strength are reduced by 7.89% and 5.65% respectively.And the compressive strength of cement stone increases by 12.43%.At the same time, the scanning electron microscopy method and the mercury porosimetry method are used to analyze the microstructure from the qualitative and quantitative perspectives. It is verified that the vibration has a positive effect on the performance of the cement slurry.With the help of the self-designed new cement stone, a new conclusion is discovered that the homogeneity and stability of the cement slurry system will be disturbed after vibration.The strength volatility of the cement stone after vibration is about 6.62 times before the vibration.In addition, the best range of vibration wave action should be in the middle of the excitation point and the far end, which provides reference for the application of well cementing technology with mechanical vibration.