A pumpjack is the overground drive for a reciprocating piston pump in an oil well. It is used to mechanically lift liquid out of the well if not enough bottom hole pressure exists for the liquid to flow all the way to the surface. The arrangement is commonly used for onshore wells producing little oil. Pumpjacks are common in oil-rich areas.
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Bottom Hole Pressure Concept | Drilling Course
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Bottom Hole Pressure Concept
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The use of the acoustic well sounding AWS technique to determine bottomhole pressure BHP requires an estimate of the gas-void fraction f. Three correlations relating the annular superficial gas velocity to fg are available for saturated oil columns. These correlations were developed by Godbey and Dimon, Podio et al.