Abstract
Abstract Shale, a heterogeneous and extremely complex gas reservoir, contains low porosity and ultra-Low permeability properties at different pore scales. Its flow behaviors are more complicated due to different forms of flow regimes under laboratory conditions. Flow regimes change with respect to pore scale variation resulting in change in gas permeability. This work presents new insights regarding the change of pore radius due to gas adsorption, effective stress and impact of both on shale gas permeability measurements in flow regimes. From this study, it was revealed that the value of Klinkenberg coefficient has been affected due to gas adsorption-induced pore radius thickness impacts and resulting change in gas permeability. The gas permeability measured from new proposed equation is provides better results as compare to existing equation. Adsorption parameters are the key factors that affect radius of shale pore. Both adsorption and effective stress have an effect on the pore radius and result gas permeability change. It was found that slip effect enhances the apparent gas permeability and also changes with effective stress; therefore, combine impact of slip flow and effective stress is very important as provides understanding in evolution of apparent permeability during shale gas production.
Highlights
Shale gas reservoirs are important source of energy after discovery of huge reserves of such reservoir around the world
It was found that slip effect enhances the apparent gas permeability and changes with effective stress; combine impact of slip flow and effective stress is very important as provides understanding in evolution of apparent permeability during shale gas production
Diffusion type and slip flow are the main components in the microscale whereas the Knudsen or slip flow and Darcy flow are predominant in mesoscale; Knudsen is significant in the scale and cannot be ignored [3]
Summary
Shale gas reservoirs are important source of energy after discovery of huge reserves of such reservoir around the world. Pore size/radius may be affected due to multiple parameters such as adsorption/desorption, water saturation (multiphase flow), fractures, and creep These parameters are potentially impact on flow regimes and affiliated parameters such as porosity and permeability [1]. 2015 [9] investigated the influence factors and transport mechanisms for shale gas reservoirs by using Lattice Boltzmann method (LBM) He revealed that net desorption, slippage and diffusion flow are highly sensitive to the pore scale. Many researchers had thought that flow regimes play a vital part in gas apparent permeability and due to this reason; they classified the various flow regimes by adopting Knudsen number On this concept, so many Kn-corrected permeability models have been made to examine the transient behaviors of shale gas reservoirs [10, 11].
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