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Plotting BHP 

LaTeX Math Inline
bodyp_{wf}(t)
 and 
LaTeX Math Inline
bodyp_e(t)
vs cumulative flow 
LaTeX Math Inline
bodyQ(t) = \int_0^t q_t(\tau) d\tau


It shows unit slope for PSS flow regime:

LaTeX Math Block
anchorpwf
alignmentleft
p_{wf}(t) = p_i + J^{-1} q_t + \frac{1}{ V_{\phi} \, c_t} Q(t)


LaTeX Math Block
anchorpe
alignmentleft
p_e(t) = p_i - \frac{Q(t)}{ V_{\phi} \, c_t}

See Also


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

0D Material Balance @model