Impact of heat of sorption on thermal enhanced recovery of sorbed gas from gas shale reservoirs – An experimental and simulation study

K. Arunachalam, X. Fan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The importance of heat of sorption in the thermal enhanced recovery of gas shale reservoirs is not well understood in the reservoir engineering community. Our results indicate that not accounting for the heat of sorption significantly over-estimated the potential for thermal enhanced gas recovery under heated conditions by about 13%. However, including the heat of sorption parameter under normal operating (isothermal) conditions did not have any effect on production estimates. This suggests that heat of sorption is a significant parameter, and cannot be ignored whilst assessing the potential for thermal enhanced recovery in gas shales. The multi-physical reservoir simulation was carried out using a modified equation for heat transfer that accounts for heat of sorption. The Langmuir equation was modified to account for the temperature dependence of sorption. Input parameters for the numerical study - sorption, heat of sorption, porosity, and permeability were experimentally measured in the laboratory using a high-pressure rig. The maximum sorption capacity on shale samples used in this study decreased significantly by 25% when the temperature was increased from 60 to 80 °C. Using sensitivity analysis, shales with high adsorption capacity and low heat of sorption were found to be good candidates for thermal stimulation to enhance sorbed gas recovery.
Original languageEnglish
Article number103318
Number of pages13
JournalJournal of Natural Gas Science and Engineering
Volume79
Early online date25 Apr 2020
DOIs
Publication statusPublished - Jul 2020

Keywords / Materials (for Non-textual outputs)

  • Shale
  • Enhanced Gas Recovery
  • Langmuir adsorption isotherm
  • Isosteric Heat
  • Reservoir Simulation

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