华南地震2025，Vol.45Issue(4)：1-7,7.DOI:10.13512/j.hndz.2025.04.01
联合超声散射波速度变化和声发射模板识别技术在大尺度页岩水力压裂实验中的应用研究
An Experimental Study on Monitoring the Hydraulic Fracturing Process of the Large-Scale Shale Sample by Integrating the Ultrasonic Multiple Scattering Wave Velocity Change and the Passive Acoustic Emission Technique
摘要
Abstract
This paper carries out an experimental study on monitoring the hydraulic fracturing process of large-scale shale sample under the true triaxial loading by using the active ultrasonic based method combined with a passive acoustic emission technique.The paper used ultrasonic multiple scattering waves to monitor wave velocity changes and a template matching based acoustic emission method to detect the acoustic emission activities during the experiment.The results suggest that integrating active and passive monitoring methods allows us to observe a decrease in wave velocity approximately 36 seconds before hydraulic fracturing breakdown.A minimum velocity reduction of 0.035(-3.5%)occurred four seconds before the breakdown.During the same stage,inactive acoustic emissions are observed 12 seconds before the breakdown,while a large number of acoustic emissions occur at the time of the breakdown.We also observe a 40 s-long logarithm velocity recovery process after the breakdown.Meanwhile,the acoustic emission shows a relatively rapid power-law decay.These findings demonstrate that integrating active and passive monitoring methods effectively characterizes the evolution of the medium during hydraulic fracturing.This provides valuable support for laboratory studies on shale gas exploration and risk assessment.关键词
超声散射波/声发射/速度变化/模板识别/水力压裂Key words
Multiple scattering waves/Acoustic emission/Velocity changes/Template matching/Hydraulic fracturing分类
能源科技引用本文复制引用
李德康,谢凡..联合超声散射波速度变化和声发射模板识别技术在大尺度页岩水力压裂实验中的应用研究[J].华南地震,2025,45(4):1-7,7.基金项目
国家重点研发计划项目(2020YFA0710600) （2020YFA0710600）
