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{\rm EUR}_O =  \frac{Q_O}{V_O} =  \frac{ (p_i - p_{wf}) \, c_t}{(1-s_{wi})\, B_o} =

 \frac{ (p_i - p_{wf}) }{(1-s_{wi})\, B_o} \, \big( c_r + s_{wi} c_w + (1-s_{wi})c_o \big)

where 

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bodyp_{wf_ \, {\rm min}}

minimal flowing bottom-hole pressure

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bodyp_i

initial formation pressure

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bodyB_o

formation volume factor for oil,

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bodyQ_o

cumulative oil production

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bodyV_o

STOIIP

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bodys_{wi}

initial water saturation in oil pay

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bodyc_t

total compressibility



For the naturally flowing wells the bottom hole pressure under flowing conditions can be roughly assed by homogeneous multiphase pipe flow model assessed as:

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Petroleum Industry / Upstream /  Production / Field Development Plan / Recovery Methods

Waterflood Recovery (WF) ]

NDR @model ]