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《Acta Petrolei Sinica》 2012-01
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A new method for the transient well test of horizontal wells and the analysis of the production decline

NIE Renshi1 JIA Yonglu1 ZHU Shuiqiao2 RAO Zheng2 ZHANG Chunguang2 GAO Yinxiang2(1.State Key Laboratory of Oil-Gas Reservoir Geology & Exploitation,Southwest Petroleum University, Chengdu 610500,China;2.PetroChina Xinjiang Oilfield Company,Karamay 834000,China)  
In order to solve the negative skin problem of horizontal wells,we established a theoretical model for the transient well test of horizontal wells and for the analysis of production decline based on traditional analysis methods.The model was solved with modern mathematical methods including the Laplace transformation,separation of variables,eigenvalue and eigenfunction.Expressions for a dynamic response to bottomhole pressure in the Laplace space and for production decline rates were obtained.Finally,type curves of typical well test and the Blasingame production decline rate analysis were programmed and plotted,and flow stages were divided so as to analyze characteristics of type curves.In addition,type curves affected by negative skin were especially plotted and they were no longer oscillatory,indicating a successful settlement of the negative problem of horizontal wells.
【Fund】: 国家重大科技专项(2008ZX05004);; 中央财政支持地方高校发展专项资金资助
【CateGory Index】: TE353
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