Analisis Pengaruh Variasi Salinitas Brine Terhadap Nilai Interfacial Tension Surfaktan ZX-1 dan ZX-2
DOI:
https://doi.org/10.37525/mz/2026-1/3129Keywords:
Enhanced Oil Recovery (EOR), Interfacial Tension (IFT), Salinitas, SurfaktanAbstract
Penerapan metode Enhanced Oil Recovery (EOR) diperlukan untuk meningkatkan perolehan minyak bumi dari lapangan tua. Salah satu metode yang umum digunakan adalah chemical flooding menggunakan surfaktan, yang berfungsi untuk menurunkan tegangan antarmuka (interfacial tension, IFT) antara minyak dan air. Tujuan dari pengujian ini adalah untuk menganalisis pengaruh variasi salinitas brine terhadap nilai IFT pada dua jenis surfaktan, yaitu ZX-1 dan ZX-2. Variasi salinitas yang digunakan adalah 0 ppm, 5.000 ppm, 10.000 ppm, 15.000 ppm, dan 20.000 ppm, dengan konsentrasi surfaktan: 0,1%, 0,3%, 0,5%, 0,8%, dan 1%. Pengujian dilakukan menggunakan metode spinning drop tensiometer mengacu pada standar ASTM D1331, pada temperatur 60℃ untuk mensimulasikan kondisi reservoir. Hasil pengujian menunjukkan bahwa nilai IFT dapat diturunkan hingga mencapai nilai terendah 10-3 dyne/cm dengan meningkatkan salinitas ke kisaran optimal 10.000 ppm sampai 15.000 ppm. Namun, pada salinitas yang lebih tinggi, nilai IFT cenderung meningkat akibat salting-out effect, yaitu penurunan kelarutan surfaktan dalam fase air sehingga efektivitasnya dalam menurunkan IFT berkurang. Surfaktan ZX-2 lebih stabil dan efisien dibandingkan surfaktan ZX-1 karena memiliki kemampuan penurunan IFT yang lebih besar dan lebih tahan terhadap variasi salinitas. Secara keseluruhan, pengujian ini menunjukkan bahwa pemilihan salinitas yang ideal untuk formulasi surfaktan sangat penting untuk mencapai tingkat efisiensi maksimum pada proses chemical EOR.
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