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- W2014269439 abstract "Abstract The increasing development of unconventional resource plays an important role in filling the gap between demand and conventional oil and gas supply. Due to the nature of low permeability, tight gas and shale reservoirs need fractures, natural and artificial, to produce hydrocarbon at commercial rates. Fracture permeability is a key factor affecting the development of these unconventional reservoirs. It is observed that fracture permeabilities decline as reservoirs are depleted because pore pressure declines lead to the closures of fractures and the permeability reductions. Therefore a correlation to quantify the fracture permeabilities varying with pore pressures is highly demanded. In this study we investigated the effects of pore pressures on fracture permeabilities assuming constant in-situ stresses exert on the formations. Starting from the force balance, we derived equations to calculate fracture permeability based on fracture geometry. Our new correlations can also be used to evaluate the changing fracture permeability during the recovery of hydrocarbon. The proposed correlations provide a way to estimate the fracture permeability at initial pressure and the depleted pressure at any production stage. We noticed that some experiments had been conducted to build relationships between fracture permeability and pressure for some types of rocks. The empirical correlations from experiments are only as good as the databases they based on. Our research provided theoretical correlations and can be applied to any conventional and unconventional reservoirs universally. The proposed methods considered the laminar flow as well as turbulent flow in the fracture, which is often observed in gas well. Under the conditions of no core sample available to test the impact of pressure on fracture permeability, or special core analyses prohibited by cost and time, the proposed correlations are powerful tools to estimate the change of permeability with producing time." @default.
- W2014269439 created "2016-06-24" @default.
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- W2014269439 date "2013-08-20" @default.
- W2014269439 modified "2023-09-23" @default.
- W2014269439 title "A Correlation to Evaluate the Fracture Permeability Changes as Reservoir is Depleted" @default.
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- W2014269439 doi "https://doi.org/10.2118/165709-ms" @default.
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