PENENTUAN FEEDZONE GEOTHERMAL LAPANGAN REX MENGGUNAKAN METODE PRESSURE TEMPERATURE SPINNER (PTS)
DOI:
https://doi.org/10.53026/prosidingsntem.v5i1.637Keywords:
Energi panas bumi, Feedzone, Geothermal, Reservoir, Survei PTSAbstract
Karakterisasi reservoir geothermal merupakan aspek krusial dalam optimasi produksi pembangkit listrik tenaga panas bumi. Penelitian ini bertujuan untuk menentukan feedzone geothermal di Lapangan REX menggunakan metode Pressure-Temperature-Spinner (PTS) untuk mengidentifikasi zona produktif, karakteristik feedzone, dan memahami distribusi fluida reservoir. Survei PTS dilakukan pada tanggal 8 Juli 2024 di salah satu sumur produksi hingga kedalaman 1815 mMD dalam kondisi flowing.
Analisis kualitatif dan kuantitatif dilakukan terhadap profil tekanan, suhu, dan spinner untuk mengidentifikasi zona inflow fluida dan karakteristik reservoir. Hasil penelitian mengidentifikasi tiga feedzone produktif dengan karakteristik berbeda: Feedzone 1 pada interval 1063-1075 mMD (ketebalan 12 m) berkontribusi 2,1 kg/s (27,3%), Feedzone 2 pada interval 1356-1374 mMD (ketebalan 18 m) berkontribusi 3,2 kg/s (41,6%), dan Feedzone 3 pada interval 1474-1489 mMD (ketebalan 15 m) berkontribusi 2,4 kg/s (31,1%),dengan total laju alir produksi 7,7 kg/s. Feedzone 2 teridentifikasi sebagai kontributor utama dan target prioritas untuk program acidizing. Zona produktif efektif berada pada kedalaman 1069-1500 mMD (total ketebalan 45 m zona aktif dalam 431 m interval) yang ditandai dengan penurunan tekanan bertahap, penurunan suhu akibat proses flashing, dan respons spinner yang mengindikasikan aliran vertikal fluida Ditemukan zona mati (dead zone) pada kedalaman di bawah 1500 mMD yang ditandai dengan tekanan konstan, kenaikan suhu signifikan, dan tidak ada kontribusi aliran. Penelitian ini memberikan informasi penting tentang distribusi zona produktif dan karakteristik reservoir yang dapat digunakan sebagai dasar pengambilan keputusan dalam manajemen produksi dan pengembangan lapangan geothermal
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