Changes

==Fluid samples==

==Fluid samples==

The taking of oil and formation water fluid samples at the appraisal stage of field development can provide valuable data later on in field life. For instance, variation in oil and water geochemistry data can be used to define reservoir compartments within a field (see [[Areal compartment]]s).

The taking of oil and formation water fluid samples at the appraisal stage of field development can provide valuable data later on in field life. For instance, variation in oil and water [[geochemistry]] data can be used to define reservoir compartments within a field (see [[Areal compartment]]s).

[[File:M91Ch6FG46.JPG|thumb|300px|{{figure number|7}}Production data for an individual oil producer. The well has a variable history of water production. Water shut-offs in 2000 and 2004 were partially successful in reducing the water cut. ]]

[[File:M91Ch6FG46.JPG|thumb|300px|{{figure number|7}}Production data for an individual oil producer. The well has a variable history of water production. Water shut-offs in 2000 and 2004 were partially successful in reducing the water cut. ]]