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design flowline of simultanous oil-gas flow

design flowline of simultanous oil-gas flow

design flowline of simultanous oil-gas flow

(OP)
Dear  friends


 i want to design flowline of simultanous oil-gas flow
 (from well head to storage and proccessing facilities)
 
the first thing in the design is the correlation that relate the  fluid properties with pressure temperature (such properties is the  dissolved gas and formation volume factor)
  
   
 for that purpose i used the The Vasquez-Beggs Equation,published  in 1980 in jpt forum.this equation is as follows    
 
Rs = C1 x gamma(gas) x p ^ C2 x exp [ C3 ( gamma(oil) / T + 460 ) ]     --1

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

c1,c2,c3 are constants depend on api   

to use this  equation , the specific gravity of gas must be known.
Vasquez in his published  stduy(1980),decided to use a value of of gas gravity  at particular conditions of seperator pressure, so he took 100 psig  as a reference pressure,and hence he gave this equation to calculate this value

gamma(gas)=gamma1(gas)(1+0.00005912*gama(oil)*t*log(p/114.7))           ---2



where
gamma1(gas):gas gravity obtained at seperator pressure(p)
            and seperator temperature(t)

gamma(oil)=api gravity



snice its difficult to calculte  gamma(gas) from equation 2,for the pipeline,hence how one could obtain the value of
gamma1(gas) at given pressure  and temperature ?


so if i use the average surface  gas gravity as gamma(gas)
instead of calculating , gamma(gas) from equation 2

the value of Rs from equation 1 would be accurate enough.  
     
and  if there is other correlation  simpler than this for
calcualting fluid properties, i would be appreciated if you mention it , at what journal  published  by year and volume

thanks
  

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