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《Natural Gas Industry》 2010-10
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An analysis of hydraulic fracturing technology in shale gas wells and its application

Tang Ying,Zhang Jinchuan,Zhang Qin,Long Pengyu(Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,Ministry of Education,China University of Geosciences,Beijing 100083,China)  
Shale gas wells can obtain favorable production only after reservoir stimulation due to their small porosity and low permeability of shale gas reservoirs.At present,hydraulic fracturing is one of the core technologies commonly used in shale gas development.Based on an analysis of the principle of hydraulic fracturing technology in shale gas development and its field practices in other countries,this paper analyzes the characteristics and applicability of a variety of hydraulic fracturing technologies,which include multi-stage fracturing,water fracturing,hydrojet fracturing,refracturing,and simultaneous fracturing.This paper also discusses the roles of natural fracture systems and fracturing fluid preparation in hydraulic fracturing.Moreover,it is suggested from studies that shale gas exploration and development in China should start from refracturing in old wells and hydraulic fracturing in new wells at present.Through a review on the data of many old wells in the southern and southwestern Sichuan Basin,it is concluded that the old wells with shale gas shows can be fractured by modern hydraulic fracturing;from foreign experiences,nitrogen foam fracturing can be used for the exploratory shallow wells or those with favorable pay zones as deep as less than 1500 m;while water fracturing can be used for the wells with pay zones as deep as 1500-3000 m;but no further development will be taken into consideration for those wells with pay zones as deep as more than 3000 m.
【Fund】: 国家自然科学基金项目(编号:40672087、40472073);; “全国油气资源战略选区调查与评价”国家专项资助
【CateGory Index】: TE377
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