Impact of ionic composition on modulating wetting preference of calcite surface: Implication for chemically tuned water flooding

Saeedi Dehaghani, A. H ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.colsurfa.2019.02.009
  3. Publisher: Elsevier B.V , 2019
  4. Abstract:
  5. Despite previous researches on ion-engineered waterflooding (IEWF), its underlying mechanisms are not fully understood, particularly in presence of additives, like surfactants. This paper concerned with the contribution of Ca 2+ , Mg 2+ , SO 4 2- and Na + into altering wettability of oil-wet carbonate minerals towards water preferred state. As a mechanistic study, an experiment workflow was conducted to probe the impact of ions' concentrations in SW, either with or without sodium dodecylbenzene sulfonate (SDBS) which is an anionic surfactant. At first, contact angle (CA) measurement was carried out to evaluate the degree of wettability reversal upon treating the oil-aged calcite slabs with desired ionic composition. Further, to evaluate dynamic response of wettability alteration, the core-flood operation was carried out by successive injection of solutions selected by static CA results. In the case of plain SW flooding, i.e., without surfactant, sulfate dominates success of IEWF, without which wettability reversal did not occur. However, at quadrupled concentration, it acts detrimentally. Ca 2+ and Mg 2+ both showed an increasing trend of wettability improvement versus concentration. Also, Na + adversely affected the treating process, without which calcite surface became a neutral state. Oil recoveries observed by core-flood experiment were in accordance with primitive CA measurements. Having SDBS generally improved the wetting reversal, while with a distinct response against salinity. The synergic actions of individual ions and SDBS molecules were interpreted via three interaction modes: surface adsorption of surfactant by increasing Na + , hydrophobic interaction of SDBS's tail with adsorbed carboxylates and releasing those compounds, and reduction of monomeric surfactants by forming strong ion-pairs with divalent cations, particularly Mg 2+ . The effect of IFT reduction and wettability modification of SDS was distinguished via a special flooding scenario, where latter proved to be significant and kinetically controlled
  6. Keywords:
  7. Calcite ; Interfacial interaction ; Ion-engineered water flooding ; Surfactant ; Wettability ; Additives ; Anionic surfactants ; Carboxylation ; Contact angle ; Dyes ; Floods ; Hydrophobicity ; Ions ; Oil well flooding ; Sulfur compounds ; Surface active agents ; Core flood experiments ; Hydrophobic interactions ; Kinetically controlled ; Monomeric surfactants ; Sodium dodecylbenzene sulfonate ; Wettability alteration ; Wettability reversal ; Wetting ; Calcium carbonate ; Calcium ion ; Carbonic acid ; Carboxylic acid ; Dodecylbenzenesulfonate sodium ; Magnesium ion ; Mineral ; Oil ; Sodium ion ; Sulfate ; Water ; Adsorption ; Concentration (parameter) ; Flooding ; Priority journal ; Salinity ; Surface property ; Workflow
  8. Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 568 , 2019 , Pages 470-480 ; 09277757 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0927775719300974#!