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• W2027404003 abstract "Abstract Conventional oilfield shaped charges form a jet consisting of hypervelocity metallic particles, whose pressure pulse can exceed 4 × 106 psi. When the metallic jet hits the rock target, the resulting shock forms a path of mechanically deformed rock as a tunnel. The shock wave also alters the rock mass around the tunnel by fragmenting rock and mineral grains. This is phenomena is an important issue in shaped-charge perforating due to its potential effect on decreasing the permeability of the rock surrounding the tunnel and decreasing the efficiency of costly perforating job. Although operating parameters can be set to remove fragmented sand grains (underbalanced perforating), it is practically difficult to remove all of them to regain the decreased permeability. Determination of permeability and the thickness of crushed zone around perforation tunnel are important for productivity calculations and especially for near-wellbore modeling. Although productivity of a well after perforating is a good indication of the permeability damage due to perforating, it does not give the permeability distribution at the vicinity of the tunnel. Even in the laboratory shots performed under insitu pressure conditions, it is a difficult task to map the permeability distribution around the tunnel. This paper proposes an easier way to estimate the permeability distribution in the crushed zone by modeling the distribution of grain fragments using fragmentation fractal theory. The resulting Eq. describes the permeability by a fractal model. It calculates pore size distribution from particle size data by setting up a hierarchical scaling concept for fragmentation to calculate the porosity of incompletely fragmented fractal porous medium. Estimated permeabilities were compared against the permeability distribution measured by using pressure transient analysis and computerized tomography (CT) scanning during injection test. It was seen that the values are close to each other." @default.
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• W2027404003 date "2002-09-29" @default.
• W2027404003 modified "2023-10-18" @default.
• W2027404003 title "Correlating Particle Size Distribution in a Crushed Zone to Perforating Permeability Damage and Modeling Using Fragmentation Fractal Theory" @default.
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• W2027404003 doi "https://doi.org/10.2118/77365-ms" @default.
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