油藏物理学英文油藏物理学 (11).ppt

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1、The Application of Fluid High-pressure Parameters Reservoir Material Balance EquationThe material balance equation(MBE)has long been recognized as one of the basic tools of reservoir engineers for interpreting and predicting reservoir performance.Estimate initial hydrocarbon volumes in place Predict

2、 future reservoir performance Predict ultimate hydrocarbon recovery under various types of primary driving mechanisms Reservoir material balance equation is based on the material balance principle.For example:(1)The gas phase balance:Original gas reserve in reservoirthe output gas+the residual gas i

3、n reservoir(2)The volumetric balance:supposed that a saturated reservoir with gas cap and bottom water.During the development,with the pressure depletion the volume of produced oil,gas and water is shown in Fig.pi Initial reservoir pressure,MPap Volumetric average reservoir pressure,MPap Change in r

4、eservoir pressure=pi p,MPapb Bubble point pressure,MPaN Initial(original)oil in place,m3m Ratio of initial gas-cap-gas reservoir volume to initial reservoir oil volumeNp Cumulative oil produced,m3Gp Cumulative gas produced,m3Wp Cumulative water produced,m3Rp Cumulative gas-oil ratio,sm3/m3GOR Instan

5、taneous gas-oil ratio,sm3/m3Rsi Initial gas solubility,sm3/m3Rs Gas solubility,sm3/m3Boi Initial oil formation volume factor,m3/sm3Bo Oil formation volume factor,m3/sm3Bgi Initial gas formation volume factor,m3/sm3Bg Gas formation volume factor,m3/sm3Winj Cumulative water injected,m3Ginj Cumulative

6、gas injected,m3We Cumulative water influx,m3G Initial gas-cap gas,m3P.V Pore volume,m3Cw Water compressibility,MPa-1Cf Formation(rock)compressibility,MPa-1The volume occupied by initial oil place:NBoi (OIIP)The volume occupied by initial gas place:mNBoi(GIIP)The total gas reserve in original bulk:Th

7、e remaining gas volume at p in reservoir:G?The solution gas volume at p in the remaining oil:The evolved gas volume at p in gas cap:The output gas volume at p in producing:Original gas reserve in reservoirthe output gas +the residual gas in reservoir 1)high pressure physical parameters of oil/gas:such as Rsi,Rs,Bgi,Bg,Boi,Bo,Bti,Bt Bw etc.2)production data,such as Np,Wp and Rp.3)unknown static,such as N,m,W .