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Artikel penelitian

Vol 11 No 2 (2017): Volume 11, Number 2, 2017

Evaluasi nilai difusivitas ion kalsium dan magnesium pada proses low salinity waterflood di batuan Berea

DOI
https://doi.org/10.22146/jrekpros.28890
Telah diserahkan
November 16, 2023
Diterbitkan
Desember 31, 2017

Abstrak

Penelitian mengenai metode low salinity waterflood (LSW) dalam beberapa tahun terakhir mengalami perkembangan yang cukup pesat. Salah satu aspek esensial dalam metode tersebut adalah respon perubahan konsentrasi ion divalent dalam ruang pori reservoir. Penelitan ini bertujuan mencari konstanta difusivitas ion kalsium dan magnesium pada batuan Berea sandstone. Konstanta difusivitas dihitung menggunakan persamaan konservasi massa dan ditinjau secara difusi yang divalidasi oleh atomic absorption spectroscopy (AAS). Penelitian dilakukan pada 2 batuan Berea dengan porositas masing-masing: 661 mD dan 550 mD. Air formasi dibuat secara sintetik sesuai data lapangan "LN". Eksperimen difusivitas Ca2+ dilakukan dengan pengenceran hingga 79% dari konsentrasi awal. Sedangkan eksperimen Mg2+ dilakukan dengan pengenceran hingga 95% dari konsentrasi awal. Sementara itu ion lain diatur tetap sesuai konsentrasi awal. Dari hasil percobaan didapat konstanta difusivitas Ca2+ sebesar 0,0620 cm2/menit dan Mg2+ sebesar 0,2667 cm2/menit.

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