Total sandface flowrate at producing well (or wells).
For the volatile oil fluid model the total sandface flowrate is related to surface flowrates of fluid components as:
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q_t = q_w + q_o + q_g = B_w \, q_W + (B_o - R_v \, B_g) \, q_O + (B_g - R_s \, B_o) \, q_G
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q^{\uparrow}_t = B_w \, q^{\uparrow}_W + \frac{B_o - R_s B_g}{1 - R_v R_s} \, q^{\uparrow}_O + \frac{B_g - R_v B_o}{1 - R_v R_s} \, q^{\uparrow}_G
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where
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water, oil, gas surface flowrates
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In case of Black Oil the above equation simplifies to:
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q^{\uparrow}_t = B_w \, q^{\uparrow}_W + (B_o - R_s B_g) \, q^{\uparrow}_O + \frac{B_g - R_v B_o}{1 - R_v R_s} \, q^{\uparrow}_G
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See Also
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Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis