温压耦合作用对水泥石力学性能的影响规律

The Influence Law of Temperature-Pressure Coupling Effect on the Mechanical Properties of Cement Stone

摘要

针对深层油气井固井水泥石在复杂温压环境下的力学响应机制不明确的问题, 系统研究了养护温度与压力、实验温度与围压对G级油井水泥石力学性能的耦合影响。通过设置不同养护温度（25～140 ℃）与压力（常压与21.7 MPa）制度制备试样, 结合不同实验温度（25～140 ℃）与围压条件（0～20 MPa）开展三轴压缩实验, 分析了应力-应变曲线、峰值应力、弹性模量的演化规律。结果表明：养护温度的升高会降低水泥石的峰值应力与弹性模量；高压养护能显著抑制孔隙发育, 提升结构致密性；实验温度的升高有助于提升水泥石在其养护温度附近的力学性能；围压的增加则增强水泥石的塑性与残余强度, 且不同耦合条件下水泥石表现出阶段性演化特征。研究结果为深部地层固井水泥浆体系设计及水泥环完整性评估提供了理论依据与实验支撑。

Abstract

To address the unclear mechanical response mechanisms of the cement sheath in deep oil and gas well cementing under complex temperature-pressure conditions, this study systematically investigated the coupled effects of curing temperature, curing pressure, testing temperature, and confining pressure on the mechanical properties of Class G oil-well cement. Specimens were prepared at different curing temperatures ranging from 25°C to 140°C and curing pressures of the atmospheric pressure and 21.7 MPa. Triaxial compression tests were then conducted at different testing temperatures from 25°C to 140°C and confining pressures from 0 to 20 MPa to analyze the evolution of stress-strain curves, peak stresses, and elastic moduli. The results show that increasing curing temperature reduces the peak stress and elastic modulus of the set cement, while high-pressure curing significantly inhibits pore development and improves structural compactness. Increasing testing temperature helps enhance the mechanical performance of cement at the testing temperature close to its curing temperature. Increasing confining pressure improves the plasticity and residual strength of cement, and the cement exhibits staged evolutionary characteristics under different coupled conditions. The findings of this study provide a theoretical basis and experimental support for the design of cement slurry systems and the integrity evaluation of cement sheaths in deep formations.

关键词

固井水泥石 / 温压耦合 / 力学性能 / 破坏模式 / 井完整性 / 深层页岩油

Key words

hardened well cement / temperature-pressure coupling / mechanical properties / failure modes / wellbore integrity / deep shale oil

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基金资助

国家自然科学基金联合基金集成项目“复杂环境下水泥环全生命周期密封理论与控制方法”(U22B6003)