(15)--201905GRE-chap1.3气藏工程气藏工程.ppt

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1、 1.3 Properties of reservoir oils1 Oil formation volume factor The ratio of the volume of oil at the prevailing reservoir temperature and pressure(Vof)to the volume of stock tank oil(Vos)m3/sm3Bo1(1)ppb,pBo the expansion of the oil(2)ppb,pBo；the evolution of the dissolved gas(3)Bo reaches a maximum

2、value at the bubble point pressure1 Oil formation volume factor1 Oil formation volume factorTwo-phase formation volume factor When reservoir pressure drops below the bubble point,the ratio of volume of oil and its evolved gas to the volume of the stock tank oil two phase formation volume factor=tota

3、l formation volume factor VosVofVgf1 Oil formation volume factorWhen p=pb,Rs=Rsi,Bt=Bob1 Oil formation volume factor(1)For pressures less than or equal to Pb,Standings correlationBo=oil FVF,RB/STB;Rs=solution GOR,scf/STB;g=specific gravity of gas(air=l.0);o=oil specific gravity=141.5/(131.5+API)(wat

4、er=l.0);TF=temperature,oF.Ranges of properties:130 Pb(psia)7000 psia;100TF(oF)258;20 Rs(scf/STB)1425;16.5API(oAPI)63.8；0.59 g0.95(air=1.0);l.024 Bo(RB/STB)2.05 1 Oil formation volume factor(2)For black oils at pressures above the bubblepointBob=oil FVF at original bubble point pressure,RB/STB;Co=iso

5、thermal compressibility of oil,psi-1;Pb=bubble point pressure,psia;P=reservoir pressure,psia.2 Solution gas-oil ratio the volume of gas measured at standard conditions,which will dissolve in unit volume of stock tank oil when subjected to reservoir pressure and temperature.sm3/m32 Solution gas-oil r

6、atioInitial gas-oil ratio,Rsi 2)When Ppb.Average compressibility of oil between pi and pb:3 Oil compressibility (1)for black oils at pressures below the bubblepoint-McCain et al.correlationsWhen Rsb is known,When Rsb is not known,Ranges of data:500P(psia)5300,763Pb(psia)5300,78TF(F)330,15 Rs(scf/STB

7、)l947,18API(API)52,0.58g l.2(air=1.0).3 Oil compressibility (2)Oil compressibility at pressures above Pb-Vasquez-Beggs correlationRanges of data:126P(psia)9500,9.3Rs(scf/STB)2199,15.3API(API)59.5,0.511gpb,p ,o Ppb,p ,o4 Oil viscosity(3)Composition of crude oil The oil viscosity increases with the ap

8、parent molecular weight and the specific gravity.4 Oil viscosity(4)the amount of dissolved gas As the amount of dissolved gas increases,the viscosity of crude oil will decrease.4 Oil viscosity (1)Dead oil(gas free)viscosity-Ng and Egbogah correlation od=dead-oil viscosity,cp;API=specific gravity of

9、oil,API;TF=temperature,F.Ranges:59TF(F)176,5.0API(API)58.0 (2)Live oil viscosity-The Beggs-Robinson correlation4 Oil viscosity Ranges:0P(psi)5250,20Rs(scf/STB)2070,70TF(F)295,16API(API)58 (3)At pressures above the bubblepoint-the Vasquez-Beggs correlation4 Oil viscosity Ranges:125P(psi)9500,9.3Rs(scf/STB)2199,0.117o(cp)148.0,15.3API(API)59.5,0.511 g1.351(air=1.0).Thank you for your attention!