Mathematical model concerning facies change action in condensate gas reservoir
LIU Hua~1, ZHONG Bao-wu~2, LI Xiu-juan~2, SHI Zhi-liang~3, CHEN Hua~1(1.No.6 Oil Production Company of Zhongyuan Oilfield Branch Company,Dongming 274511,China; 2.No.8 Oil Production Company of Daqing Oilfield Company Ltd., Daqing 163517,China; 3.Filtration Hydrodynamic Research Institute of China Academy of Sciences, Langfang 102800,China)
Condensate gas reservoir is regarded as one kind of complicated gas reservoir. In the course of its production,condensate petroleum system is accompanied with complex facies change during formation filtration. The change can result in the alteration of petroleum saturation within the reservoirs, thus the characteristics of gas filtration can be influenced and changed. On the basis of previous physical division, the properties of each filtration region are studied, at the same time,concerning the factor of facies change action of condensate gas and fluid,non-Darcy effects, thermal exchange,facies velocity,fluid properties and so on,non-Darcy factor and capillary driving force and surface tension caused by facies change are introduced,and the model equation characterizing facies change features of high-speed multiple facies flowing fluid in condensate gas reservoir is put forward. Meanwhile considering latent heat of vaporization and the thermal coupling between fluid and solid,the energy equation of thermal coupling is deduced, finally the filtration mathematical equation of facies change action in the porous medium of condensate gas reservoir is set up.
【CateGory Index】： TE319