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 $\begin{array}{l}q_g\end{array}$ is related to surface flowrates of crude oil $\begin{array}{l}q_O\end{array}$ and natural gas $\begin{array}{l}q_G\end{array}$ as (see derivation):

(1)	$\begin{array}{l}\displaystyle q_g = \frac{B_g \cdot (q_G - R_s \, q_O)}{1- R_v \, R_s}\end{array}$

where

$\begin{array}{l}B_o, \, B_g\end{array}$	gas formation volume factor between separator and sandface pressure/temperature conditions
$\begin{array}{l}R_s\end{array}$	Solution GOR at sandface pressure/temperature conditions

It simplifies for Dry Gas Reservoir with surface flow rate $\begin{array}{l}q_G\end{array}$ and gas formation volume factor $\begin{array}{l}B_g\end{array}$ to:

(2)	$\begin{array}{l}\displaystyle q_g = q_G \cdot B_g\end{array}$

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