Speaker
Description
Shale gas reservoirs are characterized by complex micro- and nano-scale pore structures, where gas exists as free gas, adsorbed gas, and dissolved gas. The adsorption layer, primarily forming on organic matter and clay mineral surfaces, significantly influences gas flow dynamics. When the radius of the gas flow channel approaches the molecular free path, the wall interface layer becomes critical. In nanoscale pores, methane adsorption layers and water films reduce effective pore diameters, affecting gas molecule migration and altering flow regimes.
This study measured pore size distributions in shale samples using mercury injection and gas adsorption methods and tested gas flow capability with a steady-state flow simulation device. Results revealed that adsorption layers, with a thickness under 1 nm as determined by potential energy functions, impact flow through Knudsen diffusion and slippage effects. These mechanisms, both caused by gas-wall interactions, should not be simultaneously considered in flow calculations. An apparent permeability model incorporating boundary layer effects was developed to describe gas flow in shale pores accurately.
Flow experiments validated the model, demonstrating its ability to fit experimental and production data. This practical model supports production modeling and recovery predictions in shale gas reservoirs. These findings enhance understanding of adsorption layer dynamics, providing a basis for optimizing gas recovery and reservoir management in Shale gas reservoirs.
| Country | China |
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