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Produced or injected flowrate of natural gas across the well-reservoir contact with the volumes measured at the sandface temperature and pressure conditions.


For MBO fluid @model the gas sandface flowrate 

LaTeX Math Inline
bodyq_g
is related to surface flowrates of crude oil 
LaTeX Math Inline
bodyq_O
 and natural gas 
LaTeX Math Inline
bodyq_G
 as (see derivation):

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anchor1
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q_g = \frac{B_g \cdot ( q_G - R_s \, q_O)
}{1- R_v \, R_s} 

where

LaTeX Math Inline
bodyB_o, \, B_g

gas formation volume factor between separator and sandface pressure/temperature conditions

LaTeX Math Inline
bodyR_s

Solution GOR at sandface pressure/temperature conditions

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