Changes

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==

Based on the ability of the fluid to freely fill the pretest chamber, a larger sample of formation fluid can be taken for analysis on the surface. The larger samples can range from 1 to 10 gal or more. Due to mud filtrate invasion, a large fraction (if not all) of the retrieved fluid may be mud filtrate. Proper analysis of the sample involves discriminating the filtrate from the native formation fluids.

Based on the ability of the fluid to freely fill the pretest chamber, a larger sample of formation fluid can be taken for analysis on the surface. The larger samples can range from 1 to 10 gal or more. Due to mud filtrate invasion, a large fraction (if not all) of the retrieved fluid may be mud filtrate. Proper analysis of the sample involves discriminating the filtrate from the native formation fluids.