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For saturated oil reservoir the free gas flow inflict the downward trend of WFP – Well Flow Performance plot similar to dry gas (Fig. 3).
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Fig. 3. WFP – Well Flow Performance for 2-phase oil+gas production below and above bubble point |
The analytical correlation for saturted oil flow is given by Vogel model:
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\frac{q}{q_b} = \frac{p_R - p_{wf}}{p_R - p_b} \quad , \quad p_R > p_{wf} > p_b |
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\frac{q}{q_{max}} =q = (q - q_b ) \Bigg[ 1 - 0.2 \, \frac{p_{wf}}{p_Rb} - 0.8 \Bigg(\frac{p_{wf}}{p_Rb} \Bigg)^2 \Bigg] + q_b \quad , \quad p_R > p_b > p_{wf} |
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