Experimental determination of relative permeabilities and critical gas saturations under solution-gas drive

Wael Al-Masri, Alexander Shapiro*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Relative permeabilities are crucial to predict oil production from underground reservoirs. Multiple previous studies are limited to measuring/estimating relative permeabilities within the region where both phases are mobile. This study presents a novel experimental method to measure the oil relative permeability under presence of the trapped gas for gas-oil systems under depressurization. The experiments were carried out with the carbonaceous reservoir and outcrop samples. The results show a highly variable amount of immobile gas for North Sea chalk (from 8% up to 26% volume) and a significant reduction in oil relative permeability (up to 75%). The relative permeabilities were found to be power-law type functions. A comparison with the previously developed pore-network based model for gas-oil relative permeabilities is presented, allowing for reconstruction of both gas and oil relative permeability curves in the whole saturation range.

Original languageEnglish
Article number108509
JournalJournal of Petroleum Science and Engineering
Volume202
Number of pages13
ISSN0920-4105
DOIs
Publication statusPublished - 2021

Keywords

  • Critical gas saturation
  • Gas liberation
  • Relative permeability
  • Solution gas drive
  • Steady state method

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