Remediation of CO2 leakage using pressure gradient reversal method: A numerical modelling study

Dong Chen, Ji Quan Shi*, Sevket Durucan, Anna Korre, Amer Syed

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

It has been suggested that injection of brine above the caprock, at a higher pressure than the CO2 pressure in the reservoir, would create an inverse pressure gradient to reverse the flow direction and increase the solubility of CO2 in the saline water barrier formed, and prevent or limit leakage. The effectiveness of the pressure gradient reversal (PGR) method as a potential remediation technique for CO2 leakage from deep saline aquifers was investigated using a realistic 3D reservoir/caprock model. A hypothetical CO2 storage operation involving CO2 injection at 1 Mt/year for up to 30 years down-dip of a structure high in the model domain was considered. The brine injection simulation results indicate that the performance of PRG is strongly affected by how early leakage is detected from the start of injection (time-to-detection), which in turns is controlled by the detection threshold, leakage pathway permeability and the distance to the injection well. PRG is more effective the earlier leakage is detected and the closer the leakage location is to the injection well.

Original languageEnglish
Title of host publication12th International Conference on Greenhouse Gas Control Technologies, GHGT-12
Pages4630-4637
Number of pages8
Volume63
DOIs
Publication statusPublished - 31 Dec 2014
Event12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014 - Austin, United States
Duration: 5 Oct 20149 Oct 2014

Publication series

NameEnergy Procedia
PublisherElsevier BV
ISSN (Print)1876-6102

Conference

Conference12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014
Country/TerritoryUnited States
CityAustin
Period5/10/149/10/14

Keywords / Materials (for Non-textual outputs)

  • Caprock leakage risk profiles
  • CO leakage remediation
  • Pressure gradient reversal
  • Reservoir simulation

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