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USES OF FORMATION TESTINGby Temitayo OlogunTo determine if reservoir will flowPermeability estimateFormation pressure and temperatureFluid gradients and typeSome idea of skinDesign mud gradientsFluid sample for PVT analysisSkin can be positive or negative, and it refers to the region around the well boreIdeally its believed that from the wellbore to the Re is homogeneousPositive skin is impairment while negative skin is improvement. *When the pad is pressed against the well bore, a drawdown is stimulated. The Ptool is assumed to be the Pformation. Flow continues until the pre-test chamber is filled. At the time, the pressure is equivalent to the pressure of the formation.The GR tool is used as a depth calibration tool to set the formation test in the zone that is to be tested. There are two types of pressure gauges:Quartz gaugeSensor gauge

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