Journal
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
Volume 202, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.petrol.2021.108509
Keywords
Gas liberation; Relative permeability; Critical gas saturation; Steady state method; Solution gas drive
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Funding
- Danish Hydrocarbon Research and Technology Center (DHRTC) under the LCR program
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This study introduces a novel experimental method to measure oil relative permeability in gas-oil systems under depressurization. The North Sea chalk was found to contain a highly variable amount of immobile gas and showed a significant reduction in oil relative permeability.
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.
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