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Abstract

Summary

Reservoir wettability is an important parameter that can affect the fluid flow characteristics in porous media. The change in wettability toward a more water-wet state underlies several enhanced oil recovery (EOR) methods. One of these methods, Smart Water flooding, is based on the injection of ion-modified water to induce chemical interactions in the formation and improve oil recovery by increasing microscopic sweep efficiency. Smart Water EOR effects have been studied for several years worldwide, however the experimental results from different researchers are not consistent. One reason for this is the difference in experimental conditions, that is, the combination of a certain crude oil chemistry, formation brine composition and core mineralogy. The interactions between crude oil, brine and rock (COBR) will create an initial wetting, which is the main characteristic determining the Smart Water EOR potential. In this work, the effect of the formation water (FW) composition on the wetting in sandstone reservoirs will be considered.

Outcrop sandstone cores with complex mineralogy were used in oil recovery tests and surface reactivity experiments. Previously published work performed on the same core system has shown potential for an average increase in oil recovery of 10% OOIP by injecting Smart Water in tertiary mode. In those experiments a FW with a high content of calcium ions (Ca2+), was used. In the present study, a high salinity NaCl brine (100 000 ppm) was used as FW in order to study the effect of the absence of divalent cations on the initial wetting and Smart Water EOR potential. An oil recovery test with FW injection was performed to evaluate the initial wetting in the core, and a low salinity (LS) NaCl brine (1000 ppm) was used to determine the Smart Water EOR potential. A pH-screening test was thereafter performed to confirm the reactivity of the core minerals, and the COBR-interactions.

The results from this work confirmed that the core was slightly less water-wet using a FW free of Ca2+-ions, resulting in a tripled Smart Water EOR effect of +30% OOIP, in tertiary mode. The wettability of the core is determined by the adsorption of reactive polar organic components onto mineral surfaces. Ca2+ ions present in the FW compete with polar organic components for adsorption sites on the mineral surfaces, making the rock surface initially more water-wet. Thus, the reduction in Ca2+ ions in the FW made the core less water-wet, increasing the Smart Water EOR effect.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.201900167
2019-04-08
2024-04-20

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References

  1. Aghaeifar, Z., Strand, S., Puntervold, T., Austad, T., Aarnes, S. and Aarnes, C
    . [2015] Adsorption/desorption of Ca2+ and Mg2+ to/from Kaolinite Clay in Relation to the Low Salinity EOR Effect. 18th European Symposium on Improved Oil Recovery, EAGE (ed.), Dresden, Germany.
     [Google Scholar]
  2. Aksulu, H., Håmsø, D., Strand, S., Puntervold, T. and Austad, T
    . [2012] Evaluation of Low-Salinity Enhanced Oil Recovery Effects in Sandstone: Effects of the Temperature and pH Gradient. Energy & Fuels26(6), 3497–3503.
     [Google Scholar]
  3. Allard, B., Tullborg, E.-L., Larson, S. Å. and Karlsson, M
    . [1983] Ion exchange capacities and surface areas of some major components and common fracture filling materials of igneous rocks. KBS' technical report., Gøteborg, Sweden.
     [Google Scholar]
  4. Austad, T., Rezaeidoust, A. and Puntervold, T
    . [2010] Chemical Mechanism of Low Salinity Water Flooding in Sandstone Reservoirs. SPE Improved Oil Recovery Symposium. Society of Petroleum Engineers, Tulsa, Oklahoma, USA.
     [Google Scholar]
  5. Buckley, J. S. and Morrow, N. R
    . [1990] Characterization of Crude Oil Wetting Behavior by Adhesion Tests. SPE/DOE Enhanced Oil Recovery Symposium, 7. Society of Petroleum Engineers, Tulsa, Oklahoma.
     [Google Scholar]
  6. Burgos, W., Pisutpaisal, N., Mazzarese, M. and Chorover, J
    . [2002] Adsorption of Quinoline to Kaolinite and Montmorillonite. Environmental Engineering Science19(2), 59–68.
     [Google Scholar]
  7. Chou, L. and Wollast, R
    . [1985] Steady-state kinetics and dissolution mechanisms of albite. American Journal of Science285(10), 963–993.
     [Google Scholar]
  8. Dubey, S. T. and Doe, P. H
    . [1993] Base Number and Wetting Properties of Crude Oils. SPE Reservoir Engineering8(03), 195–200.
     [Google Scholar]
  9. Kosmulski, M
    . [2011] The pH-dependent surface charging and points of zero charge: V. Update. Journal of Colloid and Interface Science353(1), 1–15.
     [Google Scholar]
  10. Madsen, L. and Fabricius, I. L
    . [1998] Adsorption of Carboxylic Acids on Reservoir Minerals From Organic and Aqueous Phase. SPE Reservoir Evaluation & Engineering1(01), 47–51.
     [Google Scholar]
  11. Mamonov, A., Khan, M. A. I., Puntervold, T. and Strand, S
    . [2018] Optimized Alkalinity for EOR Purposes in Sandstone Reservoirs. SPE Asia Pacific Oil and Gas Conference and Exhibition, 11. Society of Petroleum Engineers, Brisbane, Australia.
     [Google Scholar]
  12. Piñerez Torrijos, I. D., Puntervold, T., Strand, S., Austad, T., Abdullah, H. I. and Olsen, K
    . [2016] Experimental Study of the Response Time of the Low-Salinity Enhanced Oil Recovery Effect during Secondary and Tertiary Low-Salinity Waterflooding. Energy & Fuels30(6), 4733–4739.
     [Google Scholar]
  13. Piñerez Torrijos, I. D., Puntervold, T., Strand, S., Austad, T., Tran, V. V. and Olsen, K
    . [2017] Impact of temperature on the low salinity EOR effect for sandstone cores containing reactive plagioclase. Journal of Petroleum Science and Engineering156, 102–109.
     [Google Scholar]
  14. Piñerez Torrijos, I. D., Puntervold, T., Strand, S. and Rezaeidoust, A
    . [2016] Optimizing the Low Salinity Water for EOR Effects in Sandstone Reservoirs - Composition vs Salinity. 78th EAGE Conference & Exhibition, Vienna, Austria.
     [Google Scholar]
  15. Puntervold, T., Mamonov, A., Aghaeifar, Z., Frafjord, G. O., Moldestad, G. M., Strand, S. and Austad, T
    . [2018] Role of Kaolinite Clay Minerals in Enhanced Oil Recovery by Low Salinity Water Injection. Energy & Fuels32(7), 7374–7382.
     [Google Scholar]
  16. RezaeiDoust, A., Puntervold, T. and Austad, T
    . [2011] Chemical Verification of the EOR Mechanism by Using Low Saline/Smart Water in Sandstone. Energy & Fuels25(5), 2151–2162.
     [Google Scholar]
  17. Springer, N., Korsbech, U. and Aage, H. K
    . [2003] Resistivity index measurement without the porous plate: A desaturation technique based on evaporation produces uniform water saturation profiles and more reliable results for tight North Sea chalk. International Symposium of the Society of Core Analysts, Pau, France.
     [Google Scholar]
  18. Strand, S., Puntervold, T. and Austad, T
    . [2016] Water based EOR from clastic oil reservoirs by wettability alteration: A review of chemical aspects. Journal of Petroleum Science and Engineering146, 1079–1091.
     [Google Scholar]
  19. Velde, B
    . [2010] Origin and mineralogy of clays : clays and the environment. Springer, Berlin; New York.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201900167
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Effect of Formation Water Composition on Initial Wetting and Smart Water EOR Potential in Sandstones
Conference Proceedings 2019, 1 (2019); https://doi.org/10.3997/2214-4609.201900167
/content/papers/10.3997/2214-4609.201900167
/content/papers/10.3997/2214-4609.201900167
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