Evaluasi Nilai Difusivitas Ion Kalsium & Magnesium pada Proses "Low Salinity Waterflood" di Batuan Berea

https://doi.org/10.22146/jrekpros.28890

Yusmardhany Yusuf(1*), Suryo Purwono(2), Sang Kompiang Wirawan(3)

(1) Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada Jl. Grafika No.2 Kampus UGM, Yogyakarta, 55281
(2) Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada Jl. Grafika No.2 Kampus UGM, Yogyakarta, 55281
(3) Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada Jl. Grafika No.2 Kampus UGM, Yogyakarta, 55281
(*) Corresponding Author

Abstract


In recent years Low Salinity Waterflood (LSW) had been supposed as trusty method to improve oil recovery and the most essential aspect is a alteration of divalent ion concentration in reservoir pore volume as a respon LSW. The objective of this paper are to find divalent diffusivity constant (Ca2+ and Mg2+) in berea sandstone by ionsmass conservation equation along with Atomic Absorption Spectroscopy (AAS) as validation. The study was conducted at 2 berea core having porosity : 0.235 and 0.230 and permeability : 661 mD and 550 mD, we use synthetic formation water accordance to "LN" field property. Experiment was treated by by diluting Ca2+ up to 79% from its original value and  by diluting Mg2+ up to 95% from its original value while other ion were maintained fit to their original value. As a result we got difusion constant 0.0620 cm2.min-1 and 0.2667 cm2.min-1for Ca2+ and Mg2+, respectively.


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/menitdan Mg2+ sebesar 0,2667 cm2/menit.


Keywords


Low salinity waterflood; diffusion; enhanced oil recovery; calcium diffusivity; magnesium diffusivity

Full Text:

PDF


References

Ashraf, A., Hadia, N., Torsaeter, O., and Tweheyo, M. T., 2010, Laboratory investigation of low salinity waterflooding as secondary recovery process: effect of wettability, In SPE Oil and Gas India Conference and Exhibition, Society of Petroleum Engineers.

Bird R. B., Stewart W. E., and Lightfoot E. N., 1960,Transport Phenomena, John Wiley and Sons, New York, USA.

Berg, S., Cense, A. W., Jansen, E., and Bakker, K., 2010, Direct experimental evidence of wettability modification by low salinity, Petrophysics, 51(05).

Cissokho, M., Bertin, H., Boussour, S., Cordier, P., and Hamon, G., 2010, Low salinity oil recovery on clayey sandstone: experimental study, Petrophysics, 51(05).

Etemadi, A., Khodapanah, E., and Tabatabaei-Nejad, S. A., 2017, Modelling low-salinity waterflooding: Effect of divalent cations and capillary pressure, Journal of Petroleum Science and Engineering, 149, 1-8.

Khorsandi, S., Qiao, C., and Johns, R. T., 2016, Displacement efficiency for low-salinity polymer flooding including wettability alteration, SPE Journal.

Lager, A., Webb, K. J., Black, C. J. J., Singleton, M., and Sorbie, K. S., 2008, Low salinity oil recovery-an experimental investigation, Petrophysics, 49 (01).

Ligthelm, D. J., Gronsveld, J., Hofman, J., Brussee, N., Marcelis, F., and van der Linde, H., 2009, Novel waterflooding strategy by manipulation of injection brine composition, In EUROPEC/EAGE Conference and Exhibition, Society of Petroleum Engineers.

Omekeh, A. V., Evje, S., and Friis, H. A., 2013, Modeling of low salinity effects in sandstone oil rocks, Int. J. Numer. Anal. Model., Ser. B, 4(2), 95-128.

Sahimi, M., 2011, Flow and Transport in Porous Media and Fractured Rock: from Classical Methods to Modern Approaches, John Wiley & Sons, New York, USA

Wu, Y. S. and Bai, B., 2009, Efficient simulation for low salinity waterflooding in porous and fractured reservoirs, In SPE Reservoir Simulation Symposium, Society of Petroleum Engineers.

Zhang, Y. and Morrow, N. R., 2006, Comparison of secondary and tertiary recovery with change in injection brine composition for crude-oil/sandstone combinations, In SPE/DOE Symposium on Improved Oil Recovery, Society of Petroleum Engineers



DOI: https://doi.org/10.22146/jrekpros.28890

Article Metrics

Abstract views : 2195 | views : 2811

Refbacks

  • There are currently no refbacks.


Bookmark and Share


Copyright (c) 2017 Jurnal Rekayasa Proses

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.