力学测试中油井水泥石直径及高径比取值界限研究

Limits of Oil Well Cement Diameter and Height-Diameter Ratio in Mechanical Test

针对水泥石力学测试中缺乏对样品尺寸系统研究的问题,通过实验对不同直径、不同高径比的水泥石进行覆盖性测试,借助统计学方法对测试数据进行统计分析,发现水泥石的抗压强度和杨氏模量随直径或高径比的变化而变化。研究结果表明:圆柱水泥石模型力学测试的最佳直径为23.0~29.0 mm,最佳高径比为2.1~2.6。该研究为水泥环完整性分析、水泥环材料改性等研究中确定样品尺寸提供了科学依据,为水泥石力学测试标准的统一提供了数据支持。

A comprehensive experiment of cements with different diameters and height-diameter ratios was carried out to systematically study the size effect in mechanical test.The statistical analysis of test data reveals that the compressive cement strength and Young’s modulus vary with the change of diameter or height-diameter ratio.Research shows that the optimal diameter and height-diameter ratio of the cylindrical cement model are 23.0~29.0 mm and 2.1~2.6 respectively.This research could provide a scientific basis for sample size determination in cement integrity analysis and cement ring material modification and also could present certain data reference for the mechanical test unification of cement.