Pulsating hydraulic fracturing technology in low permeability coal seams

查看全文 作　　者：Wang [1]Wenchao;Li [2,3]Xianzhong;Lin [3]Baiquan;Zhai [3]Cheng

机构地区：[1]School of Civil Engineering, Tianjin University;[2]School of Energy Science and Engineering, Henan Polytechnic University;[3]School of Safety Engineering, China University of Mining and Technology

出　　处：《International Journal of Mining Science and Technology》索引2015年第25卷第4期,共5页

基　　金：the National Natural Science Foundation of China(No.51274195);the National Basic Research Program of China(No.2011CB201205);the Ph.D.Foundation of Henan Polytechnic University(No.60207005);the Education Department of Hennan Province(No.14B440007) 摘　　要：Based on the difficult situation of gas drainage in a single coal bed of high gas content and low permeability, we investigate the technology of pulsating hydraulic pressure relief, the process of crank plunger movement and the mechanism of pulsating pressure formation using theoretical research, mathematical modeling and field testing. We analyze the effect of pulsating pressure on the formation and growth of fractures in coal by using the pulsating hydraulic theory in hydraulics. The research results show that the amplitude of fluctuating pressure tends to increase in the case where the exit is blocked, caused by pulsating pressure reflection and frictional resistance superposition, and it contributes to the growth of fractures in coal. The crack initiation pressure of pulsating hydraulic fracturing is 8 MPa, which is half than that of normal hydraulic fracturing; the pulsating hydraulic fracturing influence radius reaches 8 m.The total amount of gas extraction is increased by 3.6 times, and reaches 50 L/min at the highest point.The extraction flow increases greatly, and is 4 times larger than that of drilling without fracturing and 1.2times larger than that of normal hydraulic fracturing. The technology provides a technical measure for gas drainage of high gas content and low permeability in the single coal bed. 关键词：水力压裂技术低渗透煤层脉动压力煤层气含量水力压裂裂缝瓦斯抽放技术天然气开采低渗透性

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Pulsating hydraulic fracturing technology in low permeability coal seams

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