Reservoir rock properties, fluids' type and pressure are fundamental parameters for the successful reservoir management in field development planning. Key reservoir parameters are namely horizontal permeability, vertical permeability, damage skin, radius of investigation and reservoir pressure. Together with the reservoir fluid properties, they form critical input to comprehensive production and reservoir engineering studies.

Exploration work done through a 3 wells campaign in three main gas fields offshore Malaysia is presented in this paper. The main objective for the operator is to acquire an early and quick identification of hydrocarbon prospects for appraisal wells' planning. Compared to the conventional full scale DST, the combination of Downhole fluid analysis and interval pressure transient test (IPTT) by wireline formation tester were deployed to achieve these objectives.

This paper illustrates the successful downhole reservoir fluid identification and formation testing in the reservoirs with the mobility range of 365 to 3020 md/cP. At the interval of interests with the presence of hydrocarbon, dual packer formation tester module offers selectively straddling reservoir sections to provide the capability to conduct controlled local production and interference for reservoir parameters estimation. The methodology, applications and suggested best practices applied throughout the campaign are presented in this paper.

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