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Journal : Journal of Earth Energy Science, Engineering, and Technology

Salinity Effects on Anionic AEC Surfactant with Crude Oil: IFT, Phase Behavior, Solubilization, Microemulsion Viscosity Swadesi, Boni; Azmia, Fadhlan Barrul; Pratiknyo, Avianto Kabul; Kurniawan, Aditya; Suwardi
Journal of Earth Energy Science, Engineering, and Technology Vol. 8 No. 3 (2025): JEESET VOL. 8 NO. 3 2025
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/tqms0g23

Abstract

The investigates the influence of NaCl salinity (0–32,000 ppm) on the performance of Alkyl Ethoxy Carboxylate (AEC) anionic surfactants for Enhanced Oil Recovery (EOR), using light crude oil as a model. Salinity fundamentally affects the system's Interfacial Tension (IFT), phase behavior, solubilization, and microemulsion rheology. The objectives were to map these effects and determine the optimal operational salinity and surfactant working concentration. The working concentration of 1.75% w/w was established above the Critical Micelle Concentration (CMC), determined from the breakpoint of the IFT curve versus log AEC concentration. IFT was precisely measured using a spinning-drop tensiometer. Phase behavior was characterized via a salinity scan to map the Winsor I–III–II transition, and the solubilization ratio was calculated from the equilibrium volume of the middle phase. Microemulsion viscosity was measured using a Brookfield DV3T viscometer with a stepwise shear protocol. The key results showed that an optimum salinity window produced ultra-low IFT, led to the formation of Winsor III microemulsions with a balanced oil/water solubilization ratio, and caused a viscosity peak that coincided with the Hydrophilic-Lipophilic Difference (HLD) ≈ 0 conditions. The microemulsions exhibited characteristic shear-thinning behavior across the tested shear rates. Salinity systematically controls the key physicochemical properties of the AEC–crude oil system. The findings provide: selecting the working concentration based on the CMC test and choosing the salinity at HLD ≈ 0 maximize residual oil mobilization while minimizing phase instability risks. Operational implications include precise brine selection, surfactant dosage control, and adaptive staged slug injection strategies.
Co-Authors Afni, Amanda Lailia Nur Anugerah, Nabella Maya Ardi, Iwan Aminto Ardiyansyah, Nur Aziz, Ayu Munawaroh Azmia, Fadhlan Barrul Badarsila, Adinda Citra Bambang Riyanta, Bambang Bevo Wahono Bhisma Murti Bima Nur Prasetyo Boni Swadesi Buinda , Meista Bilgis Cahya Wahyu Saputra Dewi Arini, Liss Dyah Dhendy Zaki Ridwan Dina Helianti Ernasari, Ernasari Erni Ummi Hasanah Fadullah, Ikhsan Fakhri Farida Indriani Fiarani, Hajar Syifa Gandakusuma, Imo Gusmiarni, Gusmiarni Hasanah, Erni Ummi Helmy Mukti Himawan, Helmy Mukti Hermawan Prasetyanto Ike Lusi Meilina Joko Pamungkas Kamalia Fikri Khamdani, Haris Kholilatul Wardani, Kholilatul Kuswati Kuswati Lazuardi, Muhammad Daffa Liss Dyah Dewi Arini Luky Adrianto M.Z, Yumarlin Maharani, Nadia Devi Maryani Maryani Muhajir Muhajir, Muhajir Muhamad Soleh Mujiyana Mujiyana Munandar, Syaiful Nadyatul Ilma Indah Savira Nanda Wulandari, Nanda Nurhidayat, Rojabita Dwirgahayu Nurina Rahmalia Nurul Insani Shullia Nuzuladzmi, Rafida Nariswari Oktaviane Rara Ayuningtias perwitasari Prabowo, Abram Setyo Pramadewi , Indrianti Pratiknyo, Avianto Kabul Raharti, Rini Rahman, Muhammad Budi Nur Ramadhan, Muhammad Redo Reny Yuniasanti Retno Lantarsih Reza, Agnanda Santosa, Tito Hadji Agung Sari, Mey Reza Selviana Selfi Julian Friski Sherly Aryanti Slamet Hariyadi Sosiati, Harini Sudarti Sudarti Sukamto Sukamto Suminto, Joko Suwardi Syafitri, Try Ssa Devi Tamtomo , Didik Taryo Tiara Nur Anisah Totok Suwanda Ulfa Elfiah Ummi Hasanah, Erni Wahyudi, Danang Warso Warso, Warso Widodo Widodo Wulandari, Mutiara Yayuk Fatmawati, Yayuk Yudha, Fitroh Anugrah Kusuma Yuliestyan, Avido Yulius Deddy Hermawan Yumarlin M. Z. Yusuf, Yusmardhany