TY - JOUR
T1 - The effect of Knudsen diffusion and adsorption on shale transport in nanopores
AU - Chen, Jie
AU - Hou, Jiangyong
AU - Wang, Rui
AU - Hui, Yongchang
N1 - Publisher Copyright:
© SAGE Publications Ltd 2017.
PY - 2017/9/1
Y1 - 2017/9/1
N2 - Shale transport properties are investigated by numerical simulations of a simple, physics-based continuum model. Shale samples from the Yanchang Triassic Formation in Ordos Basin are tested to get the pore volume distribution of shale. Due to the existence of nanopores in shale reservoirs, there are great differences in gas transport mechanisms compared to those in conventional gas reservoirs. These mechanisms include Knudsen diffusion and adsorption. A physics-based continuum model is utilized to simulate the gas transport in a channel with nanoscale radius, where these mechanisms are taken into consideration by imposing a general boundary condition with two parameters. The correction factor which is the ratio between apparent permeability and intrinsic permeability is investigated for a wide pressure range, which shows it is always larger than 1, illustrating that Knudsen diffusion always plays a role in shale gas transport.
AB - Shale transport properties are investigated by numerical simulations of a simple, physics-based continuum model. Shale samples from the Yanchang Triassic Formation in Ordos Basin are tested to get the pore volume distribution of shale. Due to the existence of nanopores in shale reservoirs, there are great differences in gas transport mechanisms compared to those in conventional gas reservoirs. These mechanisms include Knudsen diffusion and adsorption. A physics-based continuum model is utilized to simulate the gas transport in a channel with nanoscale radius, where these mechanisms are taken into consideration by imposing a general boundary condition with two parameters. The correction factor which is the ratio between apparent permeability and intrinsic permeability is investigated for a wide pressure range, which shows it is always larger than 1, illustrating that Knudsen diffusion always plays a role in shale gas transport.
KW - Knudsen diffusion
KW - Shale reservoirs
KW - adsorption
KW - slip boundary conditions
UR - http://www.scopus.com/inward/record.url?scp=85030220525&partnerID=8YFLogxK
U2 - 10.1177/1687814017721858
DO - 10.1177/1687814017721858
M3 - Article
AN - SCOPUS:85030220525
SN - 1687-8132
VL - 9
SP - 1
EP - 8
JO - Advances in Mechanical Engineering
JF - Advances in Mechanical Engineering
IS - 9
ER -