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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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}}

The free-water level occurs where buoyancy pressure is zero in the reservoir-aquifer system. It defines the downdip limits of an [[accumulation]]. Pressure data reliability affects the resolution; however, resolution improves when it is supplemented with other petrophysical information.

The [[free water level]] occurs where [[buoyancy pressure]] is zero in the reservoir-aquifer system. It defines the down[[dip]] limits of an [[accumulation]]. Pressure data reliability affects the resolution; however, resolution improves when it is supplemented with other petrophysical information.

==Procedure: using RFT data==

==Procedure: using repeat formation tester (RFT) data==

[[file:formation-fluid-pressure-and-its-application_fig5-12.png|400px|thumb|{{figure number|1}}Easy method for determining free-water level (FWL) by projecting RFT pressure data downward from a reservoir to the aquifer.]]

[[file:formation-fluid-pressure-and-its-application_fig5-12.png|400px|thumb|{{figure number|1}}Easy method for determining free-water level (FWL) by projecting RFT pressure data downward from a reservoir to the aquifer.]]

An easy method for determining free-water level (FWL) is projecting RFT pressure data downward from a reservoir to the aquifer. [[:file:formation-fluid-pressure-and-its-application_fig5-12.png|Figure 1]] illustrates the procedure.

An easy method for determining free water level (FWL) is projecting RFT pressure data downward from a reservoir to the aquifer. [[:file:formation-fluid-pressure-and-its-application_fig5-12.png|Figure 1]] illustrates the procedure.

==Procedure using a single measurement==

==Procedure using a single measurement==

The table below outlines the procedure for determining the free-water level using a single pressure buildup point in the reservoir.

The table below outlines the procedure for determining the free water level using a single [[Pressure_transient_testing#Pressure_drawdown_and_buildup_tests|pressure buildup]] point in the reservoir.

{| class = "wikitable"

{| class = "wikitable"