Usually produced from subsurface oil phase and gas phase.

It usually requires additional processing before taking commercial form of the Crude Oil.

For MBO fluid @model the oil surface flowrate $\begin{array}{l}q_O\end{array}$ is related to oil sandface flowrate $\begin{array}{l}q_o\end{array}$ and gas sandface flowrate $\begin{array}{l}q_g\end{array}$ as below (see Derivation):

(1)	$\begin{array}{l}\displaystyle q_O = \frac{q_o}{B_o} + R_v \,\frac{q_g}{B_g}\end{array}$

where

$\begin{array}{l}B_o, B_g\end{array}$	oil formation volume factor between separator and sandface pressure/temperature conditions
$\begin{array}{l}R_v\end{array}$	Vaporized Oil Ratio at sandface pressure/temperature conditions

The oil surface flowrate $\begin{array}{l}q_O\end{array}$ relates to Surface Liquid production rate $\begin{array}{l}q_L\end{array}$ as:

(2)	$\begin{array}{l}\displaystyle q_O = (1-Y_W) \cdot q_L\end{array}$

The oil surface flowrate $\begin{array}{l}q_O\end{array}$ relates to Total sandface flowrate $\begin{array}{l}q_t\end{array}$ as:

(3)	$\begin{array}{l}\displaystyle q_O = \frac{1-Y_W}{B_w Y_W + \left[ (B_o - R_s B_g) + (B_g - R_v B_o) \, Y_G \right] \cdot (1-Y_W)} \cdot q_t\end{array}$

It simplifies for the Black Oil model ( $\begin{array}{l}R_v = 0\end{array}$ ) to:

(4)	$\begin{array}{l}\displaystyle q_O = \frac{q_o}{B_o} =(1-Y_W) \cdot q_L = \frac{1-Y_W}{B_w Y_W + \left[ (B_o - R_s B_g) + B_g \, Y_G \right] \cdot (1-Y_W)} \cdot q_t\end{array}$

Page tree

See Also