Abstract
ABSTRACT In tight gas sands, conventional models of wireline formation testers (WFT) yield non-representative estimates of formation permeability because several important conditions found in real well situations are neglected. These conditions include flowline storage, skin permeability, formation anisotropy, supercharging pressure, and test geometry. The three-dimensional finite difference model presented in this paper incorporates all these conditions. The effect of these conditions on the WFT pressure response are discussed. The model was verified using the spherical model with boundary conditions set close to those prevailing in a spherical flow regime. The 3-D model was used to interpret three field data sets obtained in low permeability formations. The formation permeabilities were determined by matching the data to theoretical curves computed from the 3-D model.
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