The nature of fluids and permeability can be detected by using the Repeat Formation Tester (RFT) data. This detection is applied on Khatatba Formation by using six wells in Qasr Field in the Western Desert of Egypt. The Schlumberger Repeat Formation Tester (RFT) is an openhole wire line device showing a continuous recording of the pressure leads to construct the pressure gradient. The fluid density and then the nature of fluids (gas, oil and water) are determined by measuring these gradients.

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... e main objective of this research is to show the oil water contact within the zone of interest. The abrupt change in the pressure gradients the depths of contacts between water and hydrocarbon products can be located. Qualitative and quantitative permeability's of Khatatba Formation are evaluated by the direct interpretation of the pressure curve recorded at each test and by the analysis of drawdown pressure data.