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《Geoscience》 2008-04
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An CO_2 Immiscible Displacement Experimental Study Aiming at Fuyang Extra-low Permeability Layer at Peripheral of Daqing Placanticline

JIANG Hong-fu,LEI You-zhong,XIONG Xiao,YAN Li-ping,PI Wei-feng,LI Xiu-juan,YU Chang-huan (The Eighth Oil Plant of Daqing Oilfield Company Ltd,Daqing,Heilongjiang 163514,China)  
At periphery of Daqing placanticline,there is 3×108 t reserves from extra-low permeability Fuyang layer which is difficult to produce effectively through water flood development.For producing these reserves effectively,an CO2 immiscible displacement experiment is developed.PVT testing result indicates that crude oil of Fuyang reservoir is high-viscosity,low volume factor,low expansibility and contractility,and low dissolubility.At CO2 displacement capillary experiment,the lowest miscible pressure is 29 MPa,which is 8.6 MPa higher than original formation pressure and shows that is an immiscible displacement experiment.Long core experiment shows CO2 immiscible displacements get 4%-6% more recovery efficiency than water displacement.Above laboratory feasibility tests indicate that CO2 immiscible displacement experiment is workable at Fuyang reservoir.At the beginning of 2003,the CO2 gas injection pilot area was built at the south of Songfangtun oilfield.There are 1 gas injection well and 5 production wells.The field test shows that CO2 immiscible displacement can build an effective drive system at extra-low permeability and less fracture Fuyang reservoir,and improve its development effect.This technology is hopeful to be a workable one for producing Fuyang extra-low permeability layer effectively.
【Fund】: 国家科技支撑计划项目(2006BAB03B06)
【CateGory Index】: TE357.4
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