KARAKTERISASI OBSTRUKSI MEKANIS DI SUMUR GEOTHERMAL MENGGUNAKAN INTEGRASI LOGGING PTS DAN ANALISIS RIWAYAT PRODUKSI
DOI:
https://doi.org/10.53026/prosidingsntem.v5i1.789Keywords:
obstruksi sumur, logging PTS, sumur geothermal, scaling, analisis produksiAbstract
Sumur produksi di lapangan geotermal Indonesia mengalami penurunan laju alir sebesar 17.3% dalam periode 1-14 Maret 2025. Penurunan ini kemungkinan disebabkan oleh penumpukan scale mineral di dalam sumur. Penelitian ini bertujuan untuk menemukan lokasi dan jenis sumbatan dengan menggabungkan data logging Pressure-Temperature-Spinner (PTS) dan data produksi harian. Hasil analisis menunjukkan flow rate turun dari 87.2 ton/hr menjadi 72.1 ton/hr tanpa ada perubahan bukaan valve. Operasi logging pada 26 Maret 2025 berhasil menemukan sumbatan fisik pada kedalaman 791 meter berdasarkan perubahan tension yang konsisten pada tiga kali logging. Tool berhasil mencapai kedalaman maksimal 785 meter, dengan tension anomaly menunjukkan obstruksi 6 meter di bawahnya. Profil tekanan menunjukkan penurunan dari 54.2 bara (kedalaman 785m) ke 14.4 bara (wellhead), dengan gradien temperatur normal 0.0074°C/m. Profil temperatur menunjukkan wellhead mendekati kondisi saturasi (ΔTsc = +2.8°C), sementara di kedalaman terjadi subcooling tinggi (ΔTsc = -66.7°C pada 785m). Analisis menunjukkan bahwa scaling terjadi pada zona feed entry akibat CO₂ degassing saat fluida memasuki wellbore, bukan karena kondisi jenuh di wellbore. Analisis korelasi menunjukkan bahwa scale yang terbentuk adalah jenis carbonate (calcite) yang dipicu oleh CO₂ degassing akibat penurunan tekanan dari feed zone. Peningkatan flow rate sebesar 87.9% setelah logging bersifat sementara dan menurun kembali dalam 2 minggu. Penelitian merekomendasikan pembersihan mekanis dengan broaching diikuti treatment kimia untuk mencegah scale terbentuk kembali.
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