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Line 48: − − [[file:wireline-formation-testers_fig6.png|thumb|{{figure number|6}}Pretest pressure response measurements across a reservoir. Copyright: Schlumberger Well Services, 1981.]]
→Formation permeability
Formation permeability has a significant effect on the drawdown response during a pretest. The pretest pressure recordings shown in [[:file:wireline-formation-testers_fig5.png|Figure 5]] illustrate typical records for sandstones at 0.1, 1, 10, and 100 mD (millidarcys). While these figures are qualitative, quantitative techniques exist for estimating permeability using both the pressure drawdown and buildup characteristics of the pretest or sample test.
Formation permeability has a significant effect on the drawdown response during a pretest. The pretest pressure recordings shown in [[:file:wireline-formation-testers_fig5.png|Figure 5]] illustrate typical records for sandstones at 0.1, 1, 10, and 100 mD (millidarcys). While these figures are qualitative, quantitative techniques exist for estimating permeability using both the pressure drawdown and buildup characteristics of the pretest or sample test.
==Pressure applications==
==Pressure applications==