"calcualtion of solution gas oil ratio " 1

[confidential]

dear freinds
i want to design pipeline for two phase flow(oil-gas) by a computer program

so the first think in such case is to find a correlation
by which one can calculate the dissolved gas and formation volume factor and other properties that dependent on pressure and temperature. i uesed Vasquez-Beggs Equation,published in 1980 in jpt .this equation is as follows

Rs = C1 x gamma(gas) x p ^ C2 x exp [ C3 ( gamma(oil) / T + 460 ) ] --1

gamma(gas)here is a gas gravity(air=1) that would result from seperator conditions of 100 psig

c1,c2,c3 are constants depend on API

P,T:average pressure and temperature at any pipeline section.

how one could obtain this gamma(gas),for pipeline case?

thanks

 

[dcasto]

a cut and paste from the API excel sheet to estimate oil storage tank break out and flashing losses.



FLASHING LOSSES USING THE VASQUEZ-BEGGS EQUATION

Vasquez-Beggs Equation Value Equation Reference
Q= Annual Production, bbl/yr 184.52
APIG= API Gravity (Degrees) 50 From liquid analysis
C1= Vasquez-Beggs Constant 0.0178 If API Gravity >30 then C1=0.0178, otherwise =0.0362 Table 22.6, pg. 22-8 PE Handbook
C2= Vasquez-Beggs Constant 1.187 If API Gravity >30 then C2=1.187, otherwise =1.0937 Table 22.6, pg. 22-8 PE Handbook
C3= Vasquez-Beggs Constant 23.931 If API Gravity >30 then C3=23.931, otherwise =25.724 Table 22.6, pg. 22-8 PE Handbook
AD= Air density @ 14.7 psia and 60 F (lb/cu.ft.) 0.076318 Default =0.076318 Table B-2, Air Pollution Control (Cooper & Alley)
T= Fluid Temperature in vessel 60.25 Default =100 F
VP= Upstream vessel pressure (psig) 30 Default =30 psig
UP= Upstream pressure (psia) 44.7 UP = VP + 14.7
SG= Specific gravity of gas in separator (Air =1) 0.71 From gas analysis
CSG= Corrected specific gravity of gas 0.6582 CSG = SG * (1.0+5.912E-05*APIG*T*Log(UP/114.7)) Eq. 11, pg. 22-7, PE Handbook
GD= Gas Density (lb/cu.ft.) 0.0502 GD = CSG * AD
GOR= Gas to oil ratio (scf/bbl) 10.6312 GOR = CI * CSG * UP^C2 *EXP ((C3*APIG)/(T+460)) Vasquez-Beggs Correlation Equation (1)
E= Control efficiency (% Reduction) 0 Default: 0

Lf= Correlated Flashing Loss (lb/yr) 98.54689348 Lf = GOR * Q * GD * (100-E)/100
Lf= Correlated Flashing Loss (tpy) 0.049 Lf /2000 lb/ton

(1) Gas to oil ratio (GOR) is calculated using the Vasquez-Beggs Correlation; equation (17), pg. 22-9 PE Handbook

 

[confidential]

thank you very much dear for your helpfull aid


PE handbook its short for petroleum engineering handbook ?

what is the the name of the author?

thanks again