Izvorni znanstveni članak
https://doi.org/10.17794/rgn.2026.2.6
THE EFFECT OF CALCIUM AND MAGNESIUM IONS ON A CRUDE OIL-BRINE-CARBONATE ROCK SYSTEM FOR ENHANCED OIL RECOVERY BY SOPHOROLIPID SOLUTION
Indah Widiyaningsih
; Department of Petroleum Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha Street No. 10, Bandung 40132, Indonesia; Department of Petroleum Engineering, UPN Veteran Yogyakarta, Padjajaran Street, North Ring Road No.104, Ngropoh, Sleman Regency, 55283, Yogyakarta, Indonesia
Ivan Kurnia
; Department of Petroleum Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha Street No. 10, Bandung 40132, Indonesia
Harry Budiharjo Sulistyarso
; Department of Petroleum Engineering, UPN Veteran Yogyakarta, Padjajaran Street, North Ring Road No.104, Ngropoh, Sleman Regency, 55283, Yogyakarta, Indonesia
Tutuka Ariadji
; Department of Petroleum Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha Street No. 10, Bandung 40132, Indonesia
Taufan Marhaendrajana
; Department of Petroleum Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha Street No. 10, Bandung 40132, Indonesia
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* Dopisni autor.
Sažetak
The interaction between crude oil, brine and carbonate rock systems is critical for implementing enhanced oil recovery (EOR). Surfactants, such as sophorolipid biosurfactants, incorporated in the displacing fluid are able to reduce the interfacial tension (IFT) and alter the wettability in these systems. However, the presence of divalent ions, especially calcium (Ca²⁺) and magnesium (Mg²⁺), complicates this interaction, affecting the effectiveness of EOR techniques. This study examines the influence of divalent ions on crude oil–brine–carbonate rock systems with the introduction of sophorolipids through experimental work. Interfacial tension and emulsion viscosity experiments evaluate the fluid-to-fluid interactions, while contact angle and static adsorption measurements characterize the interaction between the fluids and the rock, which are highly pertinent to the EOR mechanism. The Ca²⁺ and Mg²⁺ ions (2000 ppm) to sodium chloride (NaCl) solutions (10,000–15,000 ppm) with a 0.5 wt.% sophorolipid concentration at Critical Micelle Concentration (CMC) increased the water-wetness of the carbonate rock surface. In addition, while the ions reduced the interfacial tension (IFT), they did not significantly affect the viscosity of the oil–water emulsion of the NaCl solution with 0.5 wt.% sophorolipid. At low salinity (5000 ppm NaCl solution), these ions decreased the adsorption rate of the sophorolipid solutions on Indiana Limestone samples. The addition of these divalent ions to the injection solution significantly reduced the oil recovery efficiency, by about 28% for light oil and 32% for medium oil, during the biosurfactant flooding process.
Ključne riječi
Sophorolipids; divalent ions; carbonate; salinity conditions; enhanced oil recovery
Hrčak ID:
345677
URI
Datum izdavanja:
13.3.2026.
Posjeta: 261 *