Experimental investigation of low salinity water-flooding efficiency in a Danish North Sea chalk reservoir

R. Mokhtari, B. Anabaraonye, S. Mohammadkhani, K. Feilberg

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review

Abstract

This research aims to investigate the effect of brine composition, injection scenario and temperature on oil recovery during low salinity water flooding in chalk core samples from a Danish North Sea reservoir. In addition, the mechanisms governing oil-brine-rock interactions are investigated by analyzing effluent samples and interfacial tension (IFT) measurements. For this purpose, by means of computed tomography (CT) results, homogenous chalk core samples (without any open fractures) were selected. These cores were saturated with reservoir fluids and aged at reservoir conditions for approximately three weeks. Several synthetic brines (including formation water, seawater and diluted seawater) were introduced through different injection scenarios into the aged cores at reservoir conditions. Brines used in this study were equilibrated with calcite at room temperature to minimize the effect of rock dissolution on oil recovery. Insights into the role of brine chemistry was obtained through effluent analysis performed using ion chromatography and ICP-OES. IFT measurements were conducted using a pendant drop method to quantify the extent of brine-oil interactions at reservoir conditions.

Original languageEnglish
Title of host publication82nd EAGE Conference and Exhibition 2021
PublisherEuropean Association of Geoscientists and Engineers, EAGE
Pages2577-2581
Number of pages5
ISBN (Electronic)9781713841449
DOIs
Publication statusPublished - 2021
Externally publishedYes
Event82nd EAGE Conference and Exhibition 2021 - Amsterdam, Virtual, Netherlands
Duration: 18 Oct 202121 Oct 2021

Conference

Conference82nd EAGE Conference and Exhibition 2021
Country/TerritoryNetherlands
CityAmsterdam, Virtual
Period18/10/2121/10/21

Programme Area

  • Programme Area 3: Energy Resources

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