TY - JOUR
T1 - Coupled Model of Multi-Mechanistic Gas-Water Transport Behavior in Tight Shale
AU - Liu, Ang
AU - Liu, Shimin
N1 - Funding Information:
This study was sponsored by the Open Fund Research Project Supported by the State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology (MDPC202012 and SICGM202206) and the Search Fund of Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources (Henan Polytechnic University) (KCF2209).
Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023/2/16
Y1 - 2023/2/16
N2 - In this work, the gas-water production period in a shale gas reservoir is divided into two stages: the gas-water two-phase flow dominates at Stage I, while at Stage II, the flows are controlled by the desorbed gas and water in the adsorbed phase. The evolution models of porosity and permeability incorporate the swelling strains induced by the combined gas and water sorption. A coupled model of multi-mechanistic gas-water transport behavior in tight shale was proposed and numerically solved. Results show that at Stage I, rapid gas production is observed due to the flows of free gas and desorbed gas production, followed by a decline in the production profile toward the critical water saturation point. During Stage II, the gas production rate is influenced by the residual water content controlled by the flow of water in the adsorbed phase. The effect of sorption-induced matrix shrinkage strain will take the leading role at the late production stage. In addition, the effects of elastic properties, initial permeability, and diffusion time on the permeability ratio and gas/water production profiles are discussed. These results provide a framework for analyzing gas/water transport behavior and water retention behavior in tight shale.
AB - In this work, the gas-water production period in a shale gas reservoir is divided into two stages: the gas-water two-phase flow dominates at Stage I, while at Stage II, the flows are controlled by the desorbed gas and water in the adsorbed phase. The evolution models of porosity and permeability incorporate the swelling strains induced by the combined gas and water sorption. A coupled model of multi-mechanistic gas-water transport behavior in tight shale was proposed and numerically solved. Results show that at Stage I, rapid gas production is observed due to the flows of free gas and desorbed gas production, followed by a decline in the production profile toward the critical water saturation point. During Stage II, the gas production rate is influenced by the residual water content controlled by the flow of water in the adsorbed phase. The effect of sorption-induced matrix shrinkage strain will take the leading role at the late production stage. In addition, the effects of elastic properties, initial permeability, and diffusion time on the permeability ratio and gas/water production profiles are discussed. These results provide a framework for analyzing gas/water transport behavior and water retention behavior in tight shale.
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U2 - 10.1021/acs.energyfuels.3c00084
DO - 10.1021/acs.energyfuels.3c00084
M3 - Article
AN - SCOPUS:85147829847
SN - 0887-0624
VL - 37
SP - 2860
EP - 2874
JO - Energy and Fuels
JF - Energy and Fuels
IS - 4
ER -