Effect of SO4 −2 ion exchanges and initial water saturation on low salinity water flooding (LSWF) in the dolomite reservoir rocks

Safavi, M. S ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1080/01932691.2019.1614026
  3. Publisher: Taylor and Francis Inc , 2020
  4. Abstract:
  5. The low salinity water injection has become one of the most important studies in the oil industry for improving oil recovery compared to conventional seawater injection. Thus, extensive studies have been conducted in carbonate and sandstone reservoirs to investigate how the physical properties of rocks and the chemical composition of fluids influence low salinity effect, while, the carbonate reservoir rocks requires more investigation of the effect of molecular and/or ionic interactions. In this experimental work, the effectiveness of various water flooding schemes in carbonate reservoir rock samples is investigated. In this regard, the oil recovery potential of seawater (SW), reservoir formation water (RFW) and managed water salinity (MWS), with different ion compositions adjusted based on the formation water composition are used. The experiments have been performed on the dolomite core samples and crude oil from an Iranian oil reservoir. Various measurements including zeta potential, XRD, contact angle and interfacial tension have been planned. The main contribution is to investigate the effect of both brine’s ionic composition and rock’s initial water saturation on wettability change and oil recovery. The results show that, the concentration of (Formula presented.) ion in the injected water must be managed over an optimum range for each case. This results in changing the wettability of carbonate rock to a less oil-wetting state by altering the brine composition and reducing the salinity. Moreover, initial water saturation plays a role in the process, so that, by increasing (Formula presented.) content in optimum range, the oil recovery increased. © 2019, © 2019 Taylor & Francis Group, LLC
  6. Keywords:
  7. EOR ; Ion exchanges ; Low salinity water injection ; Managed water salinity ; Carbonation ; Contact angle ; Crude oil ; Floods ; Ion exchange ; Ions ; Petroleum reservoir engineering ; Produced Water ; Reservoir management ; Reservoirs (water) ; Rocks ; Seawater ; Wetting ; Chemical compositions ; Dolomite reservoirs ; Initial water saturation ; Iranian oil reservoirs ; Low-salinity water ; Sandstone reservoirs ; Water salinity ; Wettability alteration ; Oil well flooding
  8. Source: Journal of Dispersion Science and Technology ; Volume 41, Issue 6 , 2020 , Pages 841-855
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/01932691.2019.1614026