Changes

After a reservoir has been produced, some pressure decline can be expected. Formation testers are frequently run in development or in-fill wells. When compared to initial reservoir pressures, pressure profiles in these wells often show that certain zones may have produced more than neighboring zones, thereby indicating the presence of permeability barriers.

After a reservoir has been produced, some pressure decline can be expected. Formation testers are frequently run in development or in-fill wells. When compared to initial reservoir pressures, pressure profiles in these wells often show that certain zones may have produced more than neighboring zones, thereby indicating the presence of permeability barriers.

Pressures in zones of injection have also been monitored using the Formation tester. Such a case is shown in [[:file:wireline-formation-testers_fig7.png|Figure 7]]. In this example, 22 wells were drilled some years after water flooding was begun in a reservoir. Formation tester pressure data from these 22 wells were used to plot a contour map of the formation pressure. This map clearly shows high pressure ridges associated with the banks of injection wells and troughs associated with the producing wells.

Pressures in zones of injection have also been monitored using the Formation tester. Such a case is shown in [[:file:wireline-formation-testers_fig7.png|Figure 7]]. In this example, 22 wells were drilled some years after water flooding was begun in a reservoir. Formation tester pressure data from these 22 wells were used to plot a [[contour]] map of the formation pressure. This map clearly shows high pressure ridges associated with the banks of injection wells and troughs associated with the producing wells.

==Fluid sampling==

==Fluid sampling==