研究了实时高温和循环液氮冷却对花岗岩巴西劈裂试件的影响

IF 5.3 2区 工程技术 Q1 MECHANICS
Fangchao Zhou , Guoying Wang , Housheng Jia , Gan Feng , Lei Wang , Norbert Klitzsch , Chuanliang Yan , Shaowei Liu , Zhazha Hu , Shuai Heng , Yihe Yu , Wen Wang
{"title":"研究了实时高温和循环液氮冷却对花岗岩巴西劈裂试件的影响","authors":"Fangchao Zhou ,&nbsp;Guoying Wang ,&nbsp;Housheng Jia ,&nbsp;Gan Feng ,&nbsp;Lei Wang ,&nbsp;Norbert Klitzsch ,&nbsp;Chuanliang Yan ,&nbsp;Shaowei Liu ,&nbsp;Zhazha Hu ,&nbsp;Shuai Heng ,&nbsp;Yihe Yu ,&nbsp;Wen Wang","doi":"10.1016/j.engfracmech.2025.111574","DOIUrl":null,"url":null,"abstract":"<div><div>After liquid nitrogen (LN<sub>2</sub>) fracturing stimulates the hot dry rock reservoir, thermal conduction from the surrounding rock gradually restores the fractured reservoir to high temperatures. The mechanical behavior of the reservoir under real-time high temperature conditions following LN<sub>2</sub> cooling cycles significantly influences the development of fracture networks and wellbore stability. Therefore, in this paper, investigating the effects of real-time high temperature and circulating LN<sub>2</sub> cooling on the granite Brazilian splitting test specimens. Results indicate that the real-time high temperature conditions further reduce the bond stress between the minerals, reduces the brittle-ductile transition threshold to 500℃ (600℃ at room temperature). Under the same LN<sub>2</sub> cooling cycles, tensile strength at real-time high temperature was lower than that at room temperature (except at 100℃). Compared with room temperature conditions, the tensile strength at 100℃ increased by 6.91%, while the tensile strength at 200℃, 300℃, 400℃, 500℃ and 600℃ decreased by 7.83%, 10.67%, 29.93%, 25.91% and 4.84%, respectively. In addition, compared with room temperature, the cross-section roughness at 500℃ and 600℃ increased by 7.29% and 14.66%, respectively, and Z<sub>2</sub> increased by 8.87% and 18.79%, respectively, under real-time high temperature conditions, and the acoustic emission signal was more active during the loading process, which indicated that real-time high temperature conditions promoted the initiation and propagation of microcracks. Microstructural analysis suggests that quartz α-β phase transition (573℃) and thermal expansion mismatches are key factors in thermal damage. These findings provide insights into the stability assessment of Enhanced Geothermal System reservoirs.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111574"},"PeriodicalIF":5.3000,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Investigating the effects of real-time high temperature and circulating liquid nitrogen cooling on the granite Brazilian splitting test specimens\",\"authors\":\"Fangchao Zhou ,&nbsp;Guoying Wang ,&nbsp;Housheng Jia ,&nbsp;Gan Feng ,&nbsp;Lei Wang ,&nbsp;Norbert Klitzsch ,&nbsp;Chuanliang Yan ,&nbsp;Shaowei Liu ,&nbsp;Zhazha Hu ,&nbsp;Shuai Heng ,&nbsp;Yihe Yu ,&nbsp;Wen Wang\",\"doi\":\"10.1016/j.engfracmech.2025.111574\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>After liquid nitrogen (LN<sub>2</sub>) fracturing stimulates the hot dry rock reservoir, thermal conduction from the surrounding rock gradually restores the fractured reservoir to high temperatures. The mechanical behavior of the reservoir under real-time high temperature conditions following LN<sub>2</sub> cooling cycles significantly influences the development of fracture networks and wellbore stability. Therefore, in this paper, investigating the effects of real-time high temperature and circulating LN<sub>2</sub> cooling on the granite Brazilian splitting test specimens. Results indicate that the real-time high temperature conditions further reduce the bond stress between the minerals, reduces the brittle-ductile transition threshold to 500℃ (600℃ at room temperature). Under the same LN<sub>2</sub> cooling cycles, tensile strength at real-time high temperature was lower than that at room temperature (except at 100℃). Compared with room temperature conditions, the tensile strength at 100℃ increased by 6.91%, while the tensile strength at 200℃, 300℃, 400℃, 500℃ and 600℃ decreased by 7.83%, 10.67%, 29.93%, 25.91% and 4.84%, respectively. In addition, compared with room temperature, the cross-section roughness at 500℃ and 600℃ increased by 7.29% and 14.66%, respectively, and Z<sub>2</sub> increased by 8.87% and 18.79%, respectively, under real-time high temperature conditions, and the acoustic emission signal was more active during the loading process, which indicated that real-time high temperature conditions promoted the initiation and propagation of microcracks. Microstructural analysis suggests that quartz α-β phase transition (573℃) and thermal expansion mismatches are key factors in thermal damage. These findings provide insights into the stability assessment of Enhanced Geothermal System reservoirs.</div></div>\",\"PeriodicalId\":11576,\"journal\":{\"name\":\"Engineering Fracture Mechanics\",\"volume\":\"328 \",\"pages\":\"Article 111574\"},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2025-09-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Engineering Fracture Mechanics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0013794425007751\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MECHANICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Engineering Fracture Mechanics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0013794425007751","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}
引用次数: 0

摘要

液氮(LN2)压裂对干热岩储层进行刺激后,围岩的热传导作用使裂缝储层逐渐恢复到高温状态。LN2冷却循环后,油藏在实时高温条件下的力学行为显著影响裂缝网络的发育和井筒稳定性。因此,本文研究了实时高温和循环LN2冷却对花岗岩巴西劈裂试件的影响。结果表明,实时高温条件进一步降低了矿物间的粘结应力,将脆性-韧性转变阈值降低至500℃(常温600℃)。在相同的LN2冷却循环次数下,实时高温拉伸强度低于室温(100℃除外)。与室温相比,100℃的拉伸强度提高了6.91%,200℃、300℃、400℃、500℃和600℃的拉伸强度分别降低了7.83%、10.67%、29.93%、25.91%和4.84%。此外,与室温相比,实时高温条件下,500℃和600℃的截面粗糙度分别增加了7.29%和14.66%,Z2分别增加了8.87%和18.79%,加载过程中声发射信号更加活跃,表明实时高温条件促进了微裂纹的萌生和扩展。显微组织分析表明,石英α-β相变(573℃)和热膨胀失配是造成热损伤的关键因素。这些发现为增强型地热系统储层的稳定性评价提供了新的思路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating the effects of real-time high temperature and circulating liquid nitrogen cooling on the granite Brazilian splitting test specimens
After liquid nitrogen (LN2) fracturing stimulates the hot dry rock reservoir, thermal conduction from the surrounding rock gradually restores the fractured reservoir to high temperatures. The mechanical behavior of the reservoir under real-time high temperature conditions following LN2 cooling cycles significantly influences the development of fracture networks and wellbore stability. Therefore, in this paper, investigating the effects of real-time high temperature and circulating LN2 cooling on the granite Brazilian splitting test specimens. Results indicate that the real-time high temperature conditions further reduce the bond stress between the minerals, reduces the brittle-ductile transition threshold to 500℃ (600℃ at room temperature). Under the same LN2 cooling cycles, tensile strength at real-time high temperature was lower than that at room temperature (except at 100℃). Compared with room temperature conditions, the tensile strength at 100℃ increased by 6.91%, while the tensile strength at 200℃, 300℃, 400℃, 500℃ and 600℃ decreased by 7.83%, 10.67%, 29.93%, 25.91% and 4.84%, respectively. In addition, compared with room temperature, the cross-section roughness at 500℃ and 600℃ increased by 7.29% and 14.66%, respectively, and Z2 increased by 8.87% and 18.79%, respectively, under real-time high temperature conditions, and the acoustic emission signal was more active during the loading process, which indicated that real-time high temperature conditions promoted the initiation and propagation of microcracks. Microstructural analysis suggests that quartz α-β phase transition (573℃) and thermal expansion mismatches are key factors in thermal damage. These findings provide insights into the stability assessment of Enhanced Geothermal System reservoirs.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信