Coupled Model of Multi-Mechanistic Gas-Water Transport Behavior in Tight Shale

Ang Liu, Shimin Liu

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)2860-2874
Number of pages15
JournalEnergy and Fuels
Volume37
Issue number4
DOIs
StatePublished - Feb 16 2023

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this