Water production is one of the main challenges facing oil and gas producers. It is necessary to carefully manage water production in order to enhance oil production. In order to identify watered out zones, a time lapse cased hole resistivity survey was carried out to evaluate hydrocarbon saturation.
In static conditions, the value of cased hole resistivity over other time lapse techniques resides in its deep depth of investigation, which results in increased immunity to borehole fluid reinvasion.
This technique was applied on three wells, where the water cut was ranging from 65 % to 90 %. The cased hole formation resistivity clearly identified the watered out zones. A water shutoff operation followed. The objective of the cased hole resistivity acquisition was met as the water cut dropped down to 1 to 40 % after isolation of the watered out zones.