EVALUASI DAN STRATEGI OPTIMASI PENGENDALIAN SCALING SILIKA PADA SUMUR GEOTHERMAL LAPANGAN SF25
DOI:
https://doi.org/10.53026/prosidingsntem.v5i1.715Keywords:
Geothermal, Saturation Index, Silica Scaling, Wellhead PressureAbstract
Scaling silika merupakan permasalahan serius dalam operasi pembangkit listrik tenaga panas bumi yang dapat menurunkan produktivitas sumur secara signifikan. Penelitian ini menganalisis potensi scaling pada sumur produksi di lapangan geothermal SF25 yang memiliki kandungan silika sangat tinggi yaitu 921 ppm dengan wellhead pressure 23.85 barg. Metodologi penelitian menggunakan perhitungan manual Saturation Index mengikuti metode Fournier & Truesdell yang kemudian divalidasi menggunakan software PHREEQC. Hasil perhitungan manual menunjukkan Silica Saturation Index sebesar 1.49 pada temperatur separator 150°C, mengindikasikan kondisi supersaturasi moderat. Validasi menggunakan PHREEQC mengkonfirmasi hasil tersebut dengan Saturation Index (SI) Chalcedony 2.40, SI Quartz 2.51, dan Chrysotile SI 6.69. Analisis data produksi periode Juli-Agustus 2024 menunjukkan steam flow berkisar 48-50 ton/hari dengan penurunan produktivitas moderat sebesar 2% dalam dua bulan. Prediksi laju pembentukan deposit scaling berkisar 0.8-1.2 mm/tahun tanpa mitigasi yang dapat direduksi hingga 50-60% dengan treatment yang memadai. Strategi preventif yang direkomendasikan meliputi intermittent acid injection dengan dosis 10-20 ppm, aplikasi scale inhibitor 3-7 ppm, mechanical cleaning setiap 12-18 bulan, serta monitoring geokimia berkala. Evaluasi ekonomi menunjukkan benefit/cost ratio berkisar 1.8-2.5 dengan payback period sangat menarik yaitu 2-4 bulan.
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