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* ''p''_wf = wellbore (bottomhole) flowing pressure The pressure difference (''p''_R – ''p''_wf) is called the ''reservoir drawdown''. It is the primary force drivin

...ar{p} - p_{\rm wf}} \mbox{ (for oil)} = \frac{q\mu B}{\bar{p}^{2} - p_{\rm wf}^{2}} \mbox{ (for gas)}</math> * ''p''_wf = flowing bottomhole pressure (psia)

...b>ws</sub> – ''P''_wf) versus log (''t''_s – ''t''_wf) (terms defined in Table 2). Because of storage effects, the early po | ''P''_wf

...elements. SR = San Rafael swell; KU = Kaibab uplift; MU = Monument uplift; WF = Waterpocket fold; A = Absaroka thrust fault. (c) Covenant field locality

...re which increases porosity (φf), and fractures of the reduction in width (wf) and length (hf) and the frequency of presence (FII) away from the fault pl where the capillary radius r and constant 8 exchanged with fracture width wf and 12. The equation is usually used to calculate fracture permeability. Fr