Investigation of asphaltene deposition mechanisms during CO2 huff-n-puff injection in eagle ford shale

Ziqi Shen, James J. Sheng

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In this study, laboratory tests were conducted to investigate the asphaltene depositionmechanisms during CO2 huff-n-puff injection in an Eagle Ford shale core using Wolfcamp shale oil. The permeability reduction due to asphaltene deposition by mechanical plugging and adsorption mechanisms were determined using the n-Heptane and toluene reverse flooding, respectively. The results showed that 83% of the total permeability reduction is due to asphaltene deposition by mechanical plugging mechanism, while 17% of the total permeability reduction is due to asphaltene deposition by adsorption mechanism. The critical interstitial velocity for entrainment of asphaltene deposition was around 0.0008 cm/sec.

Original languageEnglish
Pages (from-to)1960-1966
Number of pages7
JournalPetroleum Science and Technology
Volume35
Issue number20
DOIs
StatePublished - Oct 18 2017

Keywords

  • Asphaltene deposition
  • CO2 injection
  • Enhanced oil recovery
  • Huff-n-puff injection
  • Permeability reduction
  • Shale oil

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