Experimental Analysis of Influencing Factors on the Mechanical Deformation of Set Cement
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摘要: 针对从实验角度计算水泥石在一定井下条件的变形能力研究相对较少的问题,结合弹性耦合力学模型,利用实验结果计算并分析了在一定工况下,水泥浆配方、实验温度、围压、养护时间、水泥环厚度5个方面对水泥石变形能力的影响。结果表明,加入弹韧性材料能够降低水泥环的弹性模量,且加入胶乳后的水泥环力学变形能力较纤维水泥环明显要好;随着养护温度的升高,水泥石的弹性模量减小,从而增加了水泥环的总变形能力;随着围压的增大,水泥环变形能力有减弱趋势;随着水泥环在井下的时间增长,在一定程度上提高了水泥环的力学变形能力;虽然水泥环厚度对水泥石自身性能无影响,但水泥环厚度从38.1 mm减小到19.1 mm,水泥环在井下条件的变形可增大85.5%。Abstract: This paper discusses the calculation of the deformability of set cement using experimental data, which are presently rare, obtained under different circumstances such as cement slurry formulation, experimental temperature, confining pressure, curing time and thickness of cement sheath. It shows that the elastic modulus of cement sheath is reduced by adding elastic and tough materials, and that a better mechanical deformability of cement sheath is obtained by adding latex than by adding cellulose. The elastic modulus of set cement decreases with an increase in curing temperature, and the total deformability of the cement sheath, at the same time, increases. An increase in confining pressure weakens the deformability of the set cement. The mechanical deformability of the set cement sheath, to some extent, increases with time. The thickness of the cement sheath has no effect on the property of the set cement, but a decrease in cement sheath increases the deformability of the set cement, by 85.5% at the most under the prevailing downhole condition presented in this paper.
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Key words:
- Set cement /
- Mechanical model /
- Experiment /
- Influencing factor /
- Deformability
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