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In practice the constant rate production can only be maintained for wells with BHP

LaTeX Math Inline
bodyp_{wf}
   being    being above critical value 
LaTeX Math Inline
bodyp_{wf,c}
 at which pump is operational:

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and the actual liquid production rate starts declining linearly with formation pressure::

LaTeX Math Block
anchorq_L_J
alignmentleft
q_L(t) = J \cdot ( p_e(t) - p_{wf,c} )

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