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Line 34: − The figure below illustrates the relationship of the variables H<sub>w</sub> and Z used in the above equation.+ − − [[file:formation-fluid-pressure-and-its-application_fig5-35.png|thumb|{{figure number|5-35}}.]]
→Hydraulic head
===Hydraulic head===
===Hydraulic head===
[[file:formation-fluid-pressure-and-its-application_fig5-35.png|thumb|{{figure number|1}}.]]
Hydraulic head (H<sub>w</sub>) is the height or elevation above a given subsurface point at which a column connected to a body of water will equilibrate. It reflects the level of the potential energy possessed by the water.<ref name=ch05r5>Dahlberg, E., C., 1994, Applied Hydrodynamics in Petroleum Exploration, 2nd ed.: New York, Springer-Verlag, 295 p. Excellent subsurface fluid pressure reference. Covers hydrodynamic and static fluids.</ref>
Hydraulic head (H<sub>w</sub>) is the height or elevation above a given subsurface point at which a column connected to a body of water will equilibrate. It reflects the level of the potential energy possessed by the water.<ref name=ch05r5>Dahlberg, E., C., 1994, Applied Hydrodynamics in Petroleum Exploration, 2nd ed.: New York, Springer-Verlag, 295 p. Excellent subsurface fluid pressure reference. Covers hydrodynamic and static fluids.</ref>
* g = coefficient of gravity (lb force/lb mass or kg force/kg mass)
* g = coefficient of gravity (lb force/lb mass or kg force/kg mass)
[[:file:formation-fluid-pressure-and-its-application_fig5-35.png|Figure 1]] illustrates the relationship of the variables H<sub>w</sub> and Z used in the above equation.
===Potential energy of fluids===
===Potential energy of fluids===