摘要
针对储层岩石的动态强度变化规律在霍普金森压杆实验的定性分析与经验回归存在形式多样、考虑因素片面、普适性不理想等问题,基于岩石动态冲击实验成果的调研分析,提取38组716个样本实验数据,开展了动态强度主控因素影响敏感性分析,并采用数学回归方式,建立了岩石动态强度与岩石静态强度、弹性模量及应变率间的经验关系式。结果表明:通过通用全局优化算法,可回归建立岩石动态强度与应变率、静态弹性模量、静态强度等因素的计算关系式,具有较高的预测精度;岩石动态强度随应变率、静态弹性模量的增大而增大,随静态强度的增大而减小。该研究扩充了岩石动态强度计算方法的适用范围,可为岩石动力学工程问题的研究提供便捷的理论指导。
In view of the qualitative analysis and empirical regression of the dynamic strength variation law of the reservoir rock in Hopkinson pressure-bar experiment,there are many problems,such as various forms,one-sided consideration factors,unsatisfactory universality and so on.Based on the investigation and analysis of the results of the rock dynamic impact test,38 sets of 716 sample experimental data were extracted,and the sensitivity analyses of the main controlling factors for the dynamic intensity were carried out.And furthermore the mathematical regression method was used to establish the empirical relation between the rock dynamic and static strengths,the elastic modulus and the strain rate.The results show that the generalized global optimization algorithm can be used for the calculation correlation between the rock dynamic strength and the strain rate,the static elastic modulus,the static strength and so forth,the predicted precision is pretty higher;the rock dynamic strength rises with the increases of the strain rate and the static elastic mode,and furthermore it decreases with the rise of the static intensity.This studies have expanded the applicable scope of the rock dynamic strength calculating methods and provided the convenient theoretical guidance for the research on the rock dynamic engineering problems.
作者
吴飞鹏
丁乾申
杨维
李晓军
王凯
康少飞
WU Feipeng;DING Qianshen;YANG Wei;LI Xiaojun;WANG Kai;KANG Shaofei(College of Petroleum Engineering , China University of Petroleum, Qingdao 266580, China;Dongxin Oil Production Plan of Sinopec Shengli Oilfield Company, Dongying 257100, China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2020年第6期60-69,共10页
Petroleum Geology & Oilfield Development in Daqing
基金
国家自然科学基金项目“爆燃压裂中饱和脆性岩石细观损伤机制及其对宏观破坏的控制规律”(51874339)
中央高校基本科研业务费专项项目“深层致密高水平应力差异储层多级爆燃诱导体积压裂力学机理研究”(17CX05004)。
关键词
动态强度
敏感性分析
应变率
数学回归
dynamic strength
sensitivity analysis
strain rate
mathematical regression
