高温煤岩液氮冷却后巴西劈裂破坏及声发射演化特征
TD313; 采用压裂技术提升煤层气储层渗透性是强化煤层气开发的重要途径.对于深部高温煤层气储层,液氮压裂技术通过在煤层中注入低温液氮形成显著热应力,基于冷冲击作用可实现对煤层气储层的致裂增渗.为研究液氮作用对高温煤岩的力学特性及损伤破裂特征的影响机制,对加热至不同温度条件下的煤样进行液氮冷却处理,通过波速测试和巴西劈裂测试,研究液氮对高温煤样波速、强度、声发射和裂纹演化等特征及破裂模式的影响机制.结果表明:高温煤样在液氮冷却作用后,力学性能出现了显著劣化,P波波速降低,超声频率分化严重,主频由51.10 kHz降至40.88 kHz.煤样逐渐由脆性破坏向延性破坏转变,巴西劈裂模量和脆性指数降...
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| Published in | 工程科学与技术 Vol. 57; no. 1; pp. 177 - 188 |
|---|---|
| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
西安理工大学 西北旱区生态水利国家重点实验室,陕西 西安 710048%中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州 221116
2025
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2096-3246 |
| DOI | 10.12454/j.jsuese.202300356 |
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| Abstract | TD313; 采用压裂技术提升煤层气储层渗透性是强化煤层气开发的重要途径.对于深部高温煤层气储层,液氮压裂技术通过在煤层中注入低温液氮形成显著热应力,基于冷冲击作用可实现对煤层气储层的致裂增渗.为研究液氮作用对高温煤岩的力学特性及损伤破裂特征的影响机制,对加热至不同温度条件下的煤样进行液氮冷却处理,通过波速测试和巴西劈裂测试,研究液氮对高温煤样波速、强度、声发射和裂纹演化等特征及破裂模式的影响机制.结果表明:高温煤样在液氮冷却作用后,力学性能出现了显著劣化,P波波速降低,超声频率分化严重,主频由51.10 kHz降至40.88 kHz.煤样逐渐由脆性破坏向延性破坏转变,巴西劈裂模量和脆性指数降幅最高分别为67%和75%.在巴西劈裂荷载下,煤样内部声发射信号均表现为低RA值、高AF值;煤样内部破坏形式主要为拉伸破坏,其次为剪切破坏.随着煤样初始温度的增加,煤样断裂面上形成多个起伏区域,3维形貌扫描的最大波峰与最大波谷高度差最高可达37.60 mm.液氮冷却诱导的微裂隙交叉扩展形成复杂的裂纹网络,进而导致局部失效区域的形成和煤样断裂面复杂化.表观裂纹分形维数在初始加热温度为100℃时达到最大值,由初始20℃时的0.50增加到1.83.研究结果可为深部高温煤层液氮压裂设计提供理论参考. |
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| AbstractList | TD313; 采用压裂技术提升煤层气储层渗透性是强化煤层气开发的重要途径.对于深部高温煤层气储层,液氮压裂技术通过在煤层中注入低温液氮形成显著热应力,基于冷冲击作用可实现对煤层气储层的致裂增渗.为研究液氮作用对高温煤岩的力学特性及损伤破裂特征的影响机制,对加热至不同温度条件下的煤样进行液氮冷却处理,通过波速测试和巴西劈裂测试,研究液氮对高温煤样波速、强度、声发射和裂纹演化等特征及破裂模式的影响机制.结果表明:高温煤样在液氮冷却作用后,力学性能出现了显著劣化,P波波速降低,超声频率分化严重,主频由51.10 kHz降至40.88 kHz.煤样逐渐由脆性破坏向延性破坏转变,巴西劈裂模量和脆性指数降幅最高分别为67%和75%.在巴西劈裂荷载下,煤样内部声发射信号均表现为低RA值、高AF值;煤样内部破坏形式主要为拉伸破坏,其次为剪切破坏.随着煤样初始温度的增加,煤样断裂面上形成多个起伏区域,3维形貌扫描的最大波峰与最大波谷高度差最高可达37.60 mm.液氮冷却诱导的微裂隙交叉扩展形成复杂的裂纹网络,进而导致局部失效区域的形成和煤样断裂面复杂化.表观裂纹分形维数在初始加热温度为100℃时达到最大值,由初始20℃时的0.50增加到1.83.研究结果可为深部高温煤层液氮压裂设计提供理论参考. |
| Abstract_FL | The use of fracturing technology to enhance the permeability of coalbed methane reservoirs is an essential approach to strengthen coal-bed methane development.For deep and high-temperature coalbed methane reservoirs,liquid nitrogen fracturing technology injects low-temperat-ure liquid nitrogen into the coal seam,generating significant thermal stress.The"cold impact"effect effectively induces fracturing and increases permeability in coalbed methane reservoirs.This study examines the influence mechanism of liquid nitrogen treatment on the mechanical proper-ties and damage characteristics of high-temperature coal-rock.Ultrasonic testing analyzes the changes in ultrasonic characteristics of high-temper-ature coal samples after liquid nitrogen cooling.Based on the Brazilian split test and acoustic emission monitoring,the influence of liquid nitro-gen cooling on the physical and mechanical properties of high-temperature coal samples and the characteristics of acoustic emission are analyzed.In addition,the fractured characteristics of the damaged coal samples are quantitatively characterized based on the three-dimensional morphology scanning of the fracture surface and the apparent crack distribution to explore the influence mechanism of liquid nitrogen cooling on the failure mode of high-temperature coal samples.The experimental results indicated that the mechanical properties of high-temperature coal samples de-teriorate significantly after liquid nitrogen cooling.The P-wave velocity decreases,and there is severe differentiation in ultrasonic frequency,with the primary frequency decreasing from 51.10 to 40.88 kHz.The coal samples gradually transform from brittle to ductile failure,with the highest decrease in the Brazilian split modulus and brittleness index reaching 67％and 75％,respectively.Under the Brazilian split load,the internal acoustic emission signals of the coal samples exhibit low RA values and high AF values,indicating that the internal failure mode of the coal samples is mainly tensile failure,followed by shear failure.With the increase in the initial temperature of the coal samples,multiple undulating re-gions form on the fracture surface of the coal samples,and the height difference between the maximum peak and the maximum valley in the three-dimensional morphology scanning reaches up to 37.60 mm.The liquid nitrogen cooling induces the cross-extension of microcracks,forming a complex crack network,which further leads to the formation of localized failure zones and the complexity of the fracture surface of the coal samples.The fractal dimension of the apparent crack distribution reaches its maximum value when the initial heating temperature is 100 ℃,in-creasing from 0.50 at the initial temperature of 20 ℃ to 1.83.The research results provide a theoretical reference for the design of liquid nitrogen fracturing in deep and high-temperature coalbeds. |
| Author | 蔡承政 张志镇 张家辉 薛熠 时旭阳 张云 刘嘉 高峰 |
| AuthorAffiliation | 西安理工大学 西北旱区生态水利国家重点实验室,陕西 西安 710048%中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州 221116 |
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| Author_FL | XUE Yi ZHANG Jiahui LIU Jia SHI Xuyang ZHANG Yun GAO Feng ZHANG Zhizhen CAI Chengzheng |
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| DocumentTitle_FL | Characteristics of Brazilian Splitting Failure and Acoustic Emission Evolution of High-temperature Coal After Liquid Nitrogen Cooling Treatment |
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| Keywords | 液氮 巴西劈裂 damage 热应力 liquid nitrogen 损伤 coal 煤岩 thermal stress Brazilian splitting |
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| Publisher | 西安理工大学 西北旱区生态水利国家重点实验室,陕西 西安 710048%中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州 221116 |
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| Title | 高温煤岩液氮冷却后巴西劈裂破坏及声发射演化特征 |
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