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《Natural Gas Industry》 2014-01
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Application of CO_2 fracturing technology for terrestrial shale gas reservoirs

Wang Xiangzeng;Wu Jinqiao;Zhang Juntao;Shaanxi Yanchang Petroleum 〈Group〉Co.,Ltd.;Research Institute of Shaanxi Yanchang Petroleum 〈Group〉Co.,Ltd.;  
China boasts of abundant terrestrial shale gas resources.Compared with marine shale,terrestrial shale has smaller thickness,lower content of brittle minerals,higher content of clay minerals,and lower pressure.Hence,the development technology for marine shale gas,especially the fracturing technology,is not entirely applicable to terrestrial shale.To this end,aimed at the reservoir characteristics and fracturing difficulties,the features of liquid CO2foam and CO2energized fracturing technology were analyzed,and their application tests were carried out in the gas shale in the Chang-7Member of Mesozoic Yangchang Fm in the Ordos Basin.The application results showed that pure liquid CO2at a discharge rate of 2.0m3/min was capable of fracturing shale gas reservoirs in Chang-7Member with a rapid liquid unloading,and ignition could be conducted after 24h.Meanwhile,CO2energized fracturing greatly improved the fracturing fluid flowback speed and rate to shorten the liquid unloading period,which all benefited the terrestrial shale gas exploration and development.Moreover,based on the analysis of the state-of-the-art of fracturing technologies and facilities in China,the application prospect and development idea were presented of the CO2fracturing technology applied in terrestrial shale gas development.
【Fund】: 国家科技支撑计划项目“陕北煤化工CO2捕集、埋存与提高采收率技术示范”(编号:2012BAC26B00);; 陕西省科学技术研究发展计划项目“液态CO2压裂工艺优化设计理论研究”(编号:2011KJXX-57);; 陕西省科技统筹创新工程计划项目“陆相页岩气资源地质研究与勘探开发关键技术攻关”(编号:2012KTZB03-03)
【CateGory Index】: TE357.7
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