COMPARISON RESEARCH BETWEEN OIL AND GAS RELATIVE PERMEABILITIES OF QIAOKOU CONDENSATE GAS RESERVOIR IN THE DONGPU DEPRESSION OF THE BOHAI BAY BASIN

Qiaokou gas reservoir is a typical condensate one in the Dongpu Depression of the Bohai Bay Basin.Condensate oil/gas has complicated seepage flow in strata during the process of production,so the development parameters,such as producing pressure drop,gas well productivity,recovery efficiency and so on are not easy to predict.Focusing on above problems,the paper selected the rock cores of Qiaokou gas reservoir and adopted stable state methods to test relative permeability feathers of conventional,balance condensate,condensate in decompression process respectively.The comparative analysis results indicate that condensate oil/gas system presented feathers of low interfacial tension and more easily flow than conventional oil/gas.The paper predicted the oil/gas recovery efficiency of Qiaokou reservoir by applying pool simulation software and using conventional and balance relative permeability curves respectively.Compared with condensate oil in core experiment,the simulation result of balance oil/gas relative permeability curve can better reflect fluid flow of condensate oil/gas in strata and recovery efficiency of gas reservoir.