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EUR =  \frac{Q_o}{V_o} =  \frac{ (p_i - p_{wf \, min}) \, c_t}{(1-s_{wi})\, B_o} =

 \frac{ (p_i - p_{wf \, min}) }{(1-s_{wi})\, B_o} \, \big( c_r + s_{wi} c_w + (1-s_{wi})c_o \big)
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titleEUR Deduction
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c_t = \frac{1}{V_{\phi}} \frac{\partial V_{phi}}{\partial p}


For low compressible oil compressibility can be assumed constant

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bodyc_

{wf} = p_i - \

t = \rm const
and the volume reduction can be related to pressure decline as:

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\frac{\delta V_\phi}{V_\phi} = c_t \, \delta p = c_t \, (p_i - p_{wf \, min})
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\delta V_\phi = Q_o \, B_o

and

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V_o = s_o \, V_\phi = (1-s_{wi}) \, V_\phi

hence

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\frac{Q_o \, B_o \, (1-s_{wi})}{V
_e
_o} = c_t \,
\phi
 (p_i - p_{wf \, min})

and

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EUR =  \frac{Q_o}{V_o} =  \frac{ (p_i - p_{wf \, min}) \, c_t}{(1-s_{wi})\, B_o}




Water flooding

Gas flooding

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