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Analysis of pressure dynamic curve on fractured horizontal well

LI Shu-chen1,2,SHAO Xian-zhi2,FU Chun-quan3,LIU Yu4 (1.Flow and Fluid Mechanics Institute of Chinese Academy of Sciences,Langfang 102800,China;2.Exploration and Development Research Institute of Daqing Oilfield Company Ltd.,Daqing 163712,China;3.Petroleum Engineering School of Daqing Petroleum Institute,Daqing 163318;4.Tianjin Branch Company of CNOOC,Tianjin 300452,China)  
Flow process of fractured horizontal well is more complicated than horizontal well and vertical fractured well,and its pressure dynamic features have much difference with horizontal well.Therefore,with source function presented by Gringarten and Ramey,mathematical model of fractured horizontal well is established.Wellbore pressure expression and corresponding typical curves of fractured horizontal well are also obtained.Dynamic typical curves characteristics of fractured horizontal well are analyzed.The result shows that, pressure dynamic curves of fractured horizontal wells are different from that of normal horizontal well.There are two horizontal lines in pressure derivate curves of fractured horizontal well.The value of first horizontal line is half of number of fractures,while that of second one is 0.5.The closer the distance between two adjacent fractures is,the earlier the time when the first radial flow finished is.The more serious the anisotropy of reservoirs is,the longer the time when the first radial flow lasted is.
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