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- W142717022 abstract "We introduce a quantitative method to assess the spatial zone of response of formation-tester measurements acquired in vertical wells. Spatial sensitivity functions are calculated numerically from the variation of pressure transient measurements due to perturbations of permeability and porosity at a given point in space and time. Calculations are performed under the assumption of two-phase fluid flow and consider both finite line- and point-sources as well as pressure and fractional-flow monitoring probes. Conventional single-phase spherical- and radial-flow asymptotic solutions often used in the interpretation of formation-tester measurements can lead to significant errors in the assessment of spatial sensitivity functions. Such errors can bias the estimation of permeability and permeability anisotropy because of unaccounted capillary pressure and relative permeability effects. In addition, non-symmetrical flow barriers modify the spatial zone of response, whereas presence of super-charging limits the ability of formation-tester measurements to probe radially deep into permeable rock formations. Damaged and stimulated zones near the wellbore can also modify the spatial resolution properties of the acquired measurements and significantly reduce their radial length of investigation. The spatial sensitivity functions described in this paper could be used to design measurement acquisition and interpretation strategies that maximize spatial resolution and radial length of investigation in complex geometrical situations that include two-phase fluid-flow phenomena." @default.
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- W142717022 date "2007-10-01" @default.
- W142717022 modified "2023-10-17" @default.
- W142717022 title "Spatial sensitivity functions of two-phase formation-tester measurements acquired in vertical wells" @default.
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