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Natural Depletion
Oil Depletion
The Expected Ultimate Recovery during the natural oil depletion can be assessed with the following formula:
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where
– tubing-head pressure defind by the production athering system,
– is the true vertical deoth at formation top,
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| body | \{ \rho_o, \, \rho_g \} |
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– oil and gas densities,
– bubble-point pressure.
Gas Depletion
The Expected Ultimate Recovery during the natural gas depletion can be assessed with the following formula:
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EUR = \frac{Q_g}{V_g} = 1- \frac{p_{wf}}{p_i} |
Water flooding
Motivation = maintain formation pressure at sweep interface
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