Volumetric flowrate of dry gas measured at SPE Standard Conditions (STP).

Usually produced from subsurface gas phase and oil phase.

It usually requires additional processing before taking commercial form of the Natural Gas.

For MBO fluid @model the gas surface flowrate is related to gas sandface flowrate and oil sandface flowrate as (see derivation):

q_G = \frac{q_g}{B_g} + R_s \, \frac{q_o}{B_o}

where

	oil formation volume factor between separator and sandface pressure/temperature conditions
	Solution GOR at sandface pressure/temperature conditions

The gas surface flowrate relates to Surface Liquid production rate as:

q_G = Y_G \cdot (1-Y_w) \, q_L

The gas surface flowrate relates to Total sandface flowrate as:

q_G = \frac{ Y_G \cdot  (1-Y_W)}{B_w Y_W + \left[ (B_o - R_s B_g) + (B_g - R_v B_o) \, Y_G \right] \cdot (1-Y_W)}  \cdot q_t

It simplifies for the Black Oil model () to:

q_G =\frac{q_g}{B_g} +\frac{R_s \, q_o}{B_o} = Y_G \cdot (1-Y_w) \, q_L = \frac{ Y_G \cdot  (1-Y_W)}{B_w Y_W + \left[ (B_o - R_s B_g) + B_g \, Y_G \right] \cdot (1-Y_W)}  \cdot q_t

See Also