The New EOR Frontiers - Reduced Salinity Waterflooding

Authors

  • W. N. Aggrey KWAME NKRUMAH UNIVERSITY OF SCIENCE AND TECHNOLOGY-KUMASI
  • Samuel Afari
  • Kwame Sarkodie

Abstract

Reduced salinity waterflooding is a new EOR technique in which the salinity of injection water is tuned to improve oil recovery compared to conventional seawater flooding or other higher saline water.  Simply injecting enough reduced salinity waterflooding water in sandstone reservoirs has been reported to increase oil recovery under certain conditions. Three main possible mechanisms regarding Reduced salinity waterflooding have been proposed in literature despite the lack of universal justification of how the process works improving oil recovery. A common feature among the suggested mechanisms is the release of divalent cations from the rock surface.  Several schools of thought have hypothesised that Reduced salinity waterflooding results in change in wettability of the sandstone rock. As a consequence the previously attached oil mostly to clay minerals (kaolinite) is then released and floated away. Numerical simulation concept was used to model reduced salinity waterflooding water injection on field scale at reservoir conditions. The model was used to examine the effect of slug injection of reduced salinity waterflooding water, barriers preventing vertical flow, connate water banking, grid refinement and variation in the position of high permeability layer on field oil recovery factor and cumulative oil produced. The study indicated that Reduced salinity waterflooding is recovers more oil when the high permeability layer is positioned on top and when the low salt water is injected in the oil leg. The slug injection concept reduces the requirements for reduced salinity waterflooding water flood and recovers nearly the same percentage of oil. The study concluded that reduced salinity waterflooding water injection yields higher recovery and has more economical potential compared to other conventional water flooding systems. Sensitivity analysis on timing illustrated that early start of reduced salinity waterflooding water injection is immensely beneficial to Reduced salinity waterflooding improved oil recovery technique.


Author Biography

W. N. Aggrey, KWAME NKRUMAH UNIVERSITY OF SCIENCE AND TECHNOLOGY-KUMASI

PETROLEUM ENGINEERING DEPT

LECTURER

References

Agbalaka, C. D. “Coreflooding Studies to Evaluate the impact of Salinity and Wettability on Oil Recovery Efficiencyâ€. Trans Porous Med , 76:77-94, 2008.

Alotaibi M.B., Nasr-El-Din, H. “Effect of Brine Salinity on Reservoir Fluid Interfacial Tensionâ€. SPE 121569 , 2010.

Austard, T. R. “Chemical mechanism of Low Salinity Water Flooding in Sandstone Reservoirsâ€. SPE 129767, 2010.

Ayirala, S. E. “A Designer Water Process for Offshore Low Salinity and Polymer Flooding Applicationsâ€. SPE 129926, 2010.

Boussour, S. C. “Oil Recoveyr by Low Salinity Brine Injectionâ€. SPE124277. 2009

Frankeniewicz, D. (n.d.). “Diagnosing and Resolving Chemical and Mechanical Problems in Produced Water Treatment Systemsâ€.

King, G. E. “Produceed Water For Shale Fracsâ€. Treating. 12.

Larger A. W. K.. “Low Salinity Oil Recovery-An Experimental Investigatrionâ€. SCA2006-36, 2006

Larger, A. W. K. “Reduced salinity waterflooding Enhanced Oil Recovery-Evidence of Enhance Oil at the Reservoir Scaleâ€. SPE113976. 2008

Lee, S. W. “Low Salinity Oil Recovery-Increasing Understanding of the the Underlying Mechanisms. SPE1291122. 2010

Ligthelm, D. G. (n.d.). “Novel Waterflooding Strategy by Manipulation of Injection Brine Compostionâ€, SPE 119835.

McGuire, P. C. “Low Salinity Oil Recovery: An Exciting EOR Opportunity for Alaska's North Slopeâ€. SPE 93903, 2005.

Norman Morrow, S. J. (n.d.). “Improved Oil Recovery by Reduced salinity waterflooding Waterflooding†. SPE129421.

Pu, H. X. (n.d.). “Application of Coalbed Methane Water to Oil Recovery by Low Salinity Brine Waterfloodingâ€. SPE 113410 .

Resources, U. C. “The Economics of Desalinationâ€. Journal of Contemporary Water Research & Education Issue 132 , 39-45, Dec 2005

Schlumberger, Eclipse 100 Reference Manual, 2009.

Skrettinggland, K. H. “Snorre Low Salinity Water Injection-Core Flooding Experiments and Single Well Field Pilotâ€. SPE 129877, 2010.

Sposito, G. (n.d.). “The Chemistry of Soils:. Oxford University Press, Ofored†, 275.

Spring, v. 8. “Watershed Management Bulletinâ€. 2008

Tang and Morrow, N. (n.d.). “Influence of Brine Composition and Fines Migration on crude oil/roc Interaction and oil Recoveryâ€. J.P. Sci. Eng. , 24:99-111.

Tang and Morrow, N. “Injection of Dilute Brine and Crude Oil/Brine/Rock Interaction, Environmental Mechanicsâ€. Water Mass Energy Transfer in Biosphere, Geophysical Monograph 129 , 171_179.21, 2002.

Tang G. And Morrow, N. “Influence of Brine compostion and fines Migration on crude oil/rock interaction and oil recoveryâ€. J.Pet. Sci. Eng. , 24: pp99-111, 1999.

Vledder, P. F. “Low Salinity Water Flooding: Proof of Wettability Wettability Alteration on a Field Wide Scale. SPE 129564, 2010.

Webb, K. ,.A.L.I.L. SPE 18460. SPE 13 th Middle East Oil Show & Conference. Bahrain, 2003

Zhang, Y. X. “Waterflooding Performance by Injection of Brine With Different Salinity for Reservoir Cores. SPE 109849, 2007

Downloads

Published

2014-12-15

How to Cite

Aggrey, W. N., Afari, S., & Sarkodie, K. (2014). The New EOR Frontiers - Reduced Salinity Waterflooding. Asian Journal of Applied Sciences, 2(6). Retrieved from https://www.ajouronline.com/index.php/AJAS/article/view/2012

Most read articles by the same author(s)