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《Chinese Quarterly of Mechanics》 2008-03
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Fluid Characteristics of Triple-medium Double Permeability Consider Quadratic Gradient Term Effects

XUE Li-li TONG Deng-ke (China University of Petroleum,Dongying 257061,China)  
Traditional well test models for liquid flow are not consistent with material balance equation. According to the assumption of slightly compressible fluid,neglected the quadratic gradient term in nonlin- ear partial differential equation is usually lead to error.Beacause of the existence of quadratic gradient term,the partial differential equation which describes the pressure distribution of compressible fluid in porous medium is nonlinear.All terms in nonlinear partial differential equation of triple-medium system were retained,including the quadratic gradient term.The triple-mdeium double permeability model con- sisting of matrix,fractures and vugs as well as considering the effects of skin and wellbore storage was built.The difference schemes of triple porosity model were obtained by forward difference and centered second order difference method.The numerical solutions were obtained by Newton method.The change rule of pressure was addressed when triple porosity parameters change.The plots of typical pressure curves were given.
【Fund】: 国家863项目(2006AA06Z236)
【CateGory Index】: O357.3
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