ANALISIS SCALING SILIKA DAN DAMPAKNYA TERHADAP PRODUKTIVITAS SUMUR DI LAPANGAN GEOTHERMAL NYL
DOI:
https://doi.org/10.53026/prosidingsntem.v5i1.664Keywords:
Geothermal Scaling, Silika, Calcite, Penurunan Produksi, PHREEQCAbstract
Sumur geothermal dapat mengalami penurunan produksi fluida akibat pembentukan scaling mineral. Penelitian ini menganalisis potensi pembentukan scaling pada sumur produksi lapangan geothermal Indonesia dan dampaknya terhadap produktivitas. Data meliputi geokimia fluida brine dari separator, data produksi Juli 2024, dan parameter operasional. Analisis dilakukan dengan perhitungan manual Saturation Index untuk calcite dan silica mengikuti metode Fournier & Truesdell dan Köhl kemudian divalidasi dengan pemodelan PHREEQC. Hasil menunjukkan fluida memiliki kandungan silika 860 ppm dengan pH 6.06 dan WHP 1.00 barg. Perhitungan manual memberikan Calcite Saturation Index 2.70 dan Silica Saturation Index 2.40, mengindikasikan kedua jenis scaling berpotensi terbentuk. Validasi dengan PHREEQC menunjukkan supersaturasi signifikan untuk silika (SI Chalcedony 2.37, SI Quartz 2.48). Data produksi menunjukkan penurunan steam flow dari 408 ton/hr menjadi 381 ton/hr (6.7%) dalam dua bulan. Strategi mitigasi meliputi injeksi chemical inhibitor 8-10 ppm, pH modification, optimasi operasional, dan monitoring rutin dengan payback period 2-4 bulan.
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