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Brine composition effect on the oil recovery in carbonate oil reservoirs: A comprehensive experimental and CFD simulation study

Fattahi Mehraban, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.petrol.2020.107149
  3. Publisher: Elsevier B. V , 2020
  4. Abstract:
  5. In order to understand the potential role of divalent ions involved in smart water, fluid-fluid and rock-fluid interactions are studied through contact angle and interfacial tension (IFT) measurements. Then, the suitable brines in changing contact angle and IFT are brought into measurement with spontaneous imbibition experiments to evaluate the co-impact of fluid-fluid and rock-fluid interactions. The results show the importance of SO42− ions during smart water injection as removing them from the injection water leads to a sharp drop in ultimate oil recovery. Accordingly, when the concentration of SO42− within the injection water increases four times, 10% ultimate oil recovery is recovered. Furthermore, the spontaneous imbibition measurements exhibit the higher ultimate oil recovery from the neutrally-wet core plugs more rather than the strong water-wet plugs. Further elaborating about the effect of wettability on the pore-scale displacement of oil by injection water is conducted through Computational Fluid Dynamics (CFD) modelling. The results confirm that the lowest residual oil saturation is achieved in the model with neutral wettability state as well as the highest oil recovery which is in line with the piston-like displacement in the neutral wet rock medium. © 2020 Elsevier B.V
  6. Keywords:
  7. Interfacial tension ; Spontaneous imbibition ; Wettability ; Composition effects ; Computational fluid dynamics ; Contact angle ; Petroleum reservoir engineering ; Surface tension ; Wetting ; Carbonate oil reservoirs ; CFD simulations ; Enhanced oil recovery ; Fluid interactions ; Injection water ; Piston-like displacement ; Residual oil saturation ; Brine ; Chemical composition ; Fluid injection ; Geochemistry ; Hydrocarbon reservoir ; Imbibition ; Tension
  8. Source: Journal of Petroleum Science and Engineering ; Volume 191 , August , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0920410520302369