Salt precipitation and CO2/brine flow distribution under different injection well completions

Ethan Guyant, Weon Shik Han, Kue Young Kim, Myong Ho Park, Byoung Yeop Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Carbon capture and sequestration is a viable technology to reduce the concentration of CO2 emitted to the atmosphere. Salt precipitation due to dry-supercritical CO2 causes a reduction of permeability, having adverse effects on well injectivity and pressure build-up. This study evaluated the salt precipitation, brine flux patterns, and pressure build-up for two well constructions, (1) partially perforated (4 injection intervals) and (2) fully perforated throughout the target formation. Both well designs showed non-localized salt precipitation in low-k formations (5×10-15 and 50×10-15m2) and localized precipitation in high-k (250×10-15 and 500×10-15m2). It was also found that two distinct brine flux patterns occurred; under low-k conditions the brine flux was outward and parallel to CO2 migration and precipitation became limited. While under high-k conditions there developed back-flow of the brine which amplified salt precipitation. When this process occurred, the permeability reduction was orders of magnitude greater than when non-localized salt precipitation occurred. This reduction resulted in pressure build-up near the well in regions of the reservoir in which it occurred. Optimal injection conditions were found to be in reservoirs of mid-range permeability; which allowed for adequate pressure dissipation and minimized salt precipitation.

Original languageEnglish
Pages (from-to)299-310
Number of pages12
JournalInternational Journal of Greenhouse Gas Control
Volume37
DOIs
Publication statusPublished - 2015 Jun 1

All Science Journal Classification (ASJC) codes

  • Pollution
  • Energy(all)
  • Industrial and Manufacturing Engineering
  • Management, Monitoring, Policy and Law

Fingerprint Dive into the research topics of 'Salt precipitation and CO<sub>2</sub>/brine flow distribution under different injection well completions'. Together they form a unique fingerprint.

Cite this