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The difference between two straight lines 

LaTeX Math Inline
body\Delta p = | p_e(t) - p_{wf}(t) | = \rm const
 is related to productivity index
LaTeX Math Inline
bodyJ
 and flowrate
LaTeX Math Inline
bodyq_t
 which stay constant during the PSS flow regime:

LaTeX Math Block
anchorNQBD5
alignmentleft
J = \frac{q_t}{\Delta p} = \rm const

See Also

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Petroleum Industry / Upstream /  Production / Subsurface Production / Field Study & Modelling / Production Analysis

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