页岩的超临界二氧化碳压裂机理及其优势分析  

THE SUPERCRITICAL CO_(2) FRACTURING MECHANISIM AND ADVANTAGES ANALYSIS OF SHALE

作　　者：张义祥 林冲[2] 赫建明[3,4,5] 李晓 吕杰堂[1] 徐永强 ZHANG Yixiang;LIN Chong;HE Jianming;LI Xiao;LU Jietang;XU Yongqiang(China Institute of Geological Environment Monitoring,Beijing 100081,China;Southwest Petroleum University,Chengdu 610500,China;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Institutions of Earth Science,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国地质环境监测院,北京100081 [2]西南石油大学,成都610500 [3]中国科学院地质与地球物理研究所,中国科学院页岩气与地质工程重点实验室,北京100029 [4]中国科学院地球科学研究院,北京100029 [5]中国科学院大学,地球与行星科学学院,北京100049

出　　处：《工程地质学报》2024年第4期1301-1308,共8页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:41877270);中国地质调查局项目(资助号:DD20211364)。

摘　　要：超临界二氧化碳(SC-CO_(2))压裂是一种新型的无水压裂技术,对页岩储层的保护及改造效果的提升都具有重要意义。本文基于一系列页岩压裂试验结果,总结了页岩的超临界二氧化碳压裂特点,分析了二氧化碳黏度性质及相变过程中的能量变化对压裂的影响,揭示了超临界二氧化碳压裂页岩的机理,并与常规的水力压裂技术进行对比,阐明超临界二氧化碳压裂技术的优势。研究表明,超临界二氧化碳压裂页岩的破裂压力比水力压裂小,形成的页岩裂缝具有“单向扩展时宽度大,分散扩展时密度高”的特点,并且具有绿色发展的优势。研究结果对于深入了解超临界二氧化碳压裂页岩的机理和优势具有重要意义,为页岩储层的压裂改造实现绿色发展提供参考。Supercritical carbon dioxide(CO_(2))is a promising non-aqueous fracturing fluid compared to the water regularly used in hydraulic fracturing operations.It has great potential for improving shale reservoir production.In this study,the characteristics of supercritical CO_(2) fracturing were summarized,and the effects of CO_(2) viscosity and energy changes on fracturing were analyzed.Additionally,the advantages of supercritical CO_(2) fracturing compared to water fracturing were revealed.The results show that supercritical CO_(2) fracturing has the advantages of sustainability and high efficiency.All shale specimens fractured by supercritical CO_(2) show smaller breakdown pressure.The shale fractures induced by supercritical CO2 have the characteristics of simple but larger width,thin but complex.These results are of great significance for understanding the mechanism and advantages of supercritical carbon dioxide fracturing and provide references for the green development of shale reservoir fracturing.

关 键 词：超临界二氧化碳 页岩 水力压裂 裂缝扩展 

分 类 号：P642[天文地球—工程地质学]