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| 基于近场动力学的泡沫水泥石破坏机制研究及抗压强度预测 |
| Study on the Failure Mechanism of Foam Cement Stone Based on Peridynamic and Prediction of Compressive Strength |
| 投稿时间：2024-11-19 修订日期：2024-12-22 |
| DOI： |
| 中文关键词: 固井工程 泡沫水泥 近场动力学 孔隙结构 抗压强度 |
| 英文关键词:Well cementing Foam cement Peridynamic Pore structure Compressive strength |
| 基金项目:国家自然“深水油气井固井水泥传质传热过程中浅层水合物稳定机理”(51974355)资助项目 |
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| 中文摘要: |
| 水泥石抗压强度对于油气井的固井来说是一项十分重要的性能参数。相较于常规的油井水泥,泡沫水泥内部的孔隙结构会大幅影响泡沫水泥石的抗压强度。为了明确泡沫水泥内部孔隙结构对水泥石抗压强度的影响,本文以近场动力学为基础,建立了泡沫水泥石近场动力学数值模型,通过开源软件Peridigm对不同参数条件下的数值模型进行了单轴压缩模拟实验,利用文献实验结果验证了所建模型的准确性,研究揭示了不同孔隙结构下的泡沫水泥破坏机理。研究表明,泡沫水泥中孔隙之间薄壁区域的破坏是引起泡沫水泥石破坏的主要原因,泡沫水泥内部的损伤会由薄壁区域逐渐向整个水泥石内部扩展；泡沫水泥石的抗压强度与孔隙度、孔隙尺寸成负相关,与孔隙球度成正相关。以2900余个泡沫水泥模型的计算结果进行了多因素线性回归分析,定量描述了不同因素对抗压强度的影响程度,建立了泡沫水泥抗压强度预测模型,为满足不同强度要求的泡沫水泥石合理方案设计提供一定的理论依据。 |
| 英文摘要: |
| The compressive strength of cement stone is a critical performance parameter for well cementing in oil and gas wells. Compared to conventional oil well cement, the pore structure inside foam cement significantly affects the compressive strength of foam cement stone. To clarify the impact of the internal pore structure of foam cement on the compressive strength of cement stone, this study is based on peridynamics. A numerical model of peridynamics for foam cement was established, and uniaxial compression simulations were conducted under different parameter conditions using the open-source software Peridigm. The accuracy of the model was verified by experimental results from the literature. The study reveals the failure mechanisms of foam cement under different pore structures. The research shows that the failure of thin-walled regions between pores in foam cement is the main cause of failure. The damage inside foam cement expands from the thin-walled regions to the entire cement stone. The compressive strength of foam cement stone is negatively correlated with porosity and pore size, and positively correlated with pore sphericity. A multiple-factor linear regression analysis was performed based on the computational results of over 2,900 models to quantitatively describe the influence of different factors on compressive strength. A prediction model for the compressive strength of foam cement was established, providing a theoretical basis for the rational design of foam cement to meet different strength requirements. |
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