Dictionary:Normal pressure

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Formation fluid pressure equal to hydrostatic pressure, the pressure produced by a column of formation fluid extending to the surface. Hydrostatic pressure is about 0.465 psi/ft (1.05×104 Pa/m, equivalent to 9.2 lb/gallon mud); it would be 0.433 psi/ft for pure water. Fluid pressure greater than normal is called overpressure, that lower than normal, underpressure. See Figure P-12.