ANALISIS DINAMIKA GEOKIMIA BRINE DAN DAMPAKNYA PADA PROGRAM STIMULASI SUMUR
DOI:
https://doi.org/10.53026/prosidingsntem.v5i1.671Keywords:
geokimia brine, operasi bleeding, separator, TSS, quality controlAbstract
Kualitas data geokimia fluida panas bumi sangat dipengaruhi oleh kondisi operasional permukaan dan konfigurasi fasilitas pemisahan. Penelitian ini menganalisis dinamika parameter geokimia brine selama program stimulasi Sumur X pada periode Agustus 2024 untuk mengevaluasi pengaruh modus operasi terhadap kualitas data dan implikasinya pada operasional. Data meliputi pengukuran time-series pH, EC, TDS, TSS, Cl, Mg, dan Fe dari empat titik sampling (Downstream Separator S-1, Two-Phase Line Mini Separator, Two-Phase Line Bottom Port, dan Discharge AFT) dengan variasi wellhead pressure (WHP) 8.97-26.15 barg dan status operasi online maupun bleeding 7-12 putaran. Hasil menunjukkan bahwa modus bleeding menyebabkan peningkatan TSS hingga 4,676 ppm di Discharge AFT dengan indikasi passing dari dumping line, sementara kondisi online di S-1 menghasilkan TSS lebih rendah (rata-rata 1,754±1,205 ppm) dan Cl lebih stabil (rata-rata 18,875±1,590 ppm).Perbedaan signifikan antara Mini Separator dan Bottom Port pada waktu bersamaan mengindikasikan fraksinasi fase dengan Bottom Port menunjukkan TDS 48,034 ppm dibanding 10,708 ppm pada Mini Separator. Analisis korelasi menunjukkan WHP tidak berkorelasi kuat dengan TSS (R²=0.18), mengindikasikan konfigurasi valve dan isolasi dumping line lebih dominan. Analisis duplikasi Mg menunjukkan deviasi hingga 187.8%, menekankan kebutuhan quality control ketat. Nilai Mg umumnya rendah (0.30-11.10 ppm) konsisten dengan fluida geothermal mature. Temuan utama penelitian ini adalah: (1) bleeding meningkatkan TSS 52.9% dan Cl 33.5% akibat passing dumping line, (2) titik sampling menentukan representasi data dengan perbedaan TDS hingga 348% antara Mini Separator dan Bottom Port, (3) variabilitas Mg tinggi memerlukan filtrasi on-site dan triplikasi analisis. Strategi perbaikan meliputi implementasi SOP sampling dengan stabilisasi kondisi operasi 15-30 menit sebelum pengambilan sampel, filtrasi on-site 0.45 μm, pencatatan sistematis parameter operasional, dan pelengkapan analisis temperatur serta SiO₂ untuk evaluasi scaling yang lebih komprehensif.
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