In this paper, the use of various pressure measurements is investigated for determining formation pressure and permeability distributions by use of the multiprobe formation testing packer and probe modules (PPM's) in horizontal wells. It is shown that reservoir pressure measurements along the wellbore give local and reservoir-scale information about how the reservoir is being depleted and how cleanup takes place. The estimation of horizontal and vertical permeabilities, skin, and reservoir pressure along the wellbore is also presented by use of interval (local) pressure transient tests. For PPM in horizontal wells, an interpretation method is presented for determining the reservoir parameters. A few interval pressure transient test (IPTT) examples are presented for formation pressure and permeability distributions, and fluid sampling.

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