Produced or injected flowrate of natural gas across the well-reservoir contact with the volumes measured at the sandface temperature and pressure conditions.
For volatile oil fluid model the gas sandface flowrate q_g is related to surface flowrates of crude oil q_O and natural gas q_G as:
(1) | q_g = B_g \, ( q_G - R_s \, q_O) |
where
q_O, \, q_G | crude oil and natural gas surface flowrates |
B_o, \, B_g | gas formation volume factor between separator and sandface pressure/temperature conditions |
R_s | Solution GOR at sandface pressure/temperature conditions |
It simplifies for gas reservoir with surface flow rate q_G and gas formation volume factor B_g to:
(2) | q_g = q_G \cdot B_g |
See also
Non-linear multi-phase diffusion derivation @model