Analysis of impact pressure,rock-breaking effect,and ground vibration induced by the disposable CO_(2)fracturing tube  

作　　者：Chong Yu Yongan Ma Haibo Li Shouchun Deng Yafei Hao Kuan Zhu 

机构地区：[1]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China [2]University of Chinese Academy of Sciences,Beijing,100049,China [3]Explosives Co.Ltd.,Changsha,410000,China [4]Wuhan University of Science and Technology,Wuhan,430000,China [5]Gezhouba EXPL(Hunan)Technology Co.Ltd.,Liuyang,410300,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第8期3099-3121,共23页岩石力学与岩土工程学报（英文版）

基　　金：financially supported by the National Key R&D Program of China(Grant No.2020YFA0711802);the Wuhan Science and Technology Bureau of China(Grant No.2023020201010081);the National Nature Science Foundation of China(Grant No.U22A20239).

摘　　要：The technology of expansion fracturing with liquid CO_(2)(EFLCO_(2))has attracted increasing attention due to reduced vibration and damage.The disposable fracturing tube has been developed and is gradually replacing the Cardox tube.However,there is a lack of impact pressure testing of disposable tubes under real working conditions,selection of gas explosion design parameters,and systematic analysis of blasting vibration.This limitation has constrained the widespread application of disposable fracturing tubes in engineering.A joint monitoring of the pressure-time curves in the disposable tubes and boreholes was conducted.The rock-breaking effect of varying hole spacing parameters in the EFLCO_(2)design was analyzed,and a systematic study was carried out on the vibration peak value,frequency,and energy characteristics.The results show that(1)the pressure distribution characteristics,stress peak value,and duration in the disposable tubes are different from those of Cardox tubes,which show multi-peak distribution,low-pressure peak value,and short duration.The correlation between the pressure in the disposable tube,filling pressure,and liquid CO_(2)weight is established,and a theoretical calculation method for the borehole wall pressure is proposed;(2)The hole spacing in rocks of different hardness is suggested;and(3)At the same scale distance,the peak particle velocity(PPV)caused by EFLCO_(2)(PPVCO_(2))is significantly smaller than that caused by blasting(PPVexplosive).The ratio of PPVexplosive to PPVCO_(2)is a power function related to scale distance,and a distance-related zonality exist in this relationship.The frequency composition of the vibration signal caused by EFLCO_(2)is relatively simple with a narrow frequency band.Its PPV and energy are mainly concentrated in the low-frequency band.This research contributes to the optimization of disposable fracturing tubes,gas explosion design,and vibration hazard control.

关 键 词：Disposable tube Liquid CO_(2) Impact pressure Hole spacing Vibration effect Cardox tube 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程] TE377[自动化与计算机技术—计算机应用技术] TP391.41[自动化与计算机技术—计算机科学与技术]