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ABSTRAK
Terdorong oleh temuan terbaru mengenai surfaktan peptida yang mampu membentuk stabil emulsi melalui penurunan tegangan antar muka, maka pengujian untuk investigasi lanjut terhadap penerapan molekul peptida untuk aplikasi EOR telah dilakukan. Surfaktan peptida yang didesain menggunakan pendekatan bioteknologi protein telah diuji skala laboratorium pada tiga karakteristik minyak, air formasi, dan batuan reservoar yang berbeda. Kinerja terbaik surfaktan peptida diperoleh pada uji menggunakan sampel A. Surfaktan peptida mampu membentuk mikroemulsi Tipe III pada pH 11. Mampu menurunkan nilai tegangan antar muka hingga kisaran 10-2 dyne/cm pada temperatur 25oC, walaupun masih belum memenuhi target yang diharapkan yaitu dapat menurunkan tegangan antar muka hingga 10-3 dyne/
cm atau lebih kecil. Surfaktan peptida juga mampu mengubah sifat kebasahan batuan dari water wet menjadi strong water wet. Sampel A memiliki rantai hidrokarbon relatif pendek dibandingkan sampel B dan C, tergolong minyak intermediate, salinitas air formasi dikategorikan sedang, dan mineral batuan dominan kuarsa tanpa mineral gypsum yang sangat merusak fungsi surfaktan. Surfaktan peptida yang telah dikembangkan belum stabil pada temperatur tinggi. Uji pada temperatur 70oC menunjukkan nilai tegangan antar muka naik menjadi sekitar 10-1 dyne/cm. E¿ siensi pendesakan menggunakan sampel minyak A kurang dari 1%. Berdasarkan pada hasil ini, maka perancangan surfaktan peptida berikutnya akan fokus pada peningkatan sifat ketahanan terhadap suhu dan rekayasa posisi susunan asam amino peptida untuk menghasilkan sifat surfaktan yang lebih baik. Hasil uji kinerja surfaktan peptida yang disajikan dalam makalah ini sangat berguna dalam perancangan surfaktan peptida yang spesi¿ k untuk suatu lapangan minyak tertentu.
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