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Offtakes (withdrawals)

Created by Arthur Aslanyan (Nafta College), last modified on Nov 12, 2018

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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:

(1)	$\begin{array}{l}\displaystyle q^{\uparrow}_t = B_w \, q^{\uparrow}_W + \frac{B_o - R_s B_g}{1 - R_v R_s} \, q^{\uparrow}_O + \frac{B_g - R_v B_o}{1 - R_v R_s} \, q^{\uparrow}_G\end{array}$

where

$\begin{array}{l}q^{\uparrow}_W, \, q^{\uparrow}_O, \, q^{\uparrow}_G\end{array}$	water, oil, gas surface flowrates
$\begin{array}{l}B_w, \, B_o, \, B_g\end{array}$	formation volume factors between separator and sandface pressure/temperature conditions
$\begin{array}{l}R_s, \, R_v\end{array}$	Solution GOR and Vaporized oil ratio at sandface pressure/temperature conditions

See Also

Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis

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