Enhanced oil recovery from carbonate reservoirs by spontaneous imbibition of low salinity water

An experimental study was performed to investigate the impact of low salinity water on wettability alteration in carbonate core samples from southern Iranian reservoirs by spontaneous imbibition. In this paper, the effect of temperature, salinity, permeability and connate water were investigated by comparing the produced hydrocarbon curves. Contact angle measurements were taken to confirm the alteration of surface wettability of porous media. Oil recovery was enhanced by increasing the dilution ratio of sea water, and there existed an optimum dilution ratio at which the highest oil recovery was achieved. In addition, temperature had a very significant impact on oil recovery from carbonate rocks. Furthermore, oil recovery from a spontaneous imbibition process was directly proportional to the permeability of the core samples. The presence of connate water saturation inside the porous media facilitated oil production significantly. Also, the oil recovery from porous media was highly dependent on ion repulsion/attraction activity of the rock surface which directly impacts on the wettability conditions. Finally, the highest ion attraction percentage was measured for sodium while there was no significant change in pH for all experiments.

[1]  T. Austad,et al.  Experimental Study of the Response Time of the Low-Salinity Enhanced Oil Recovery Effect during Secondary and Tertiary Low-Salinity Waterflooding , 2016 .

[2]  Christopher E. Reddick,et al.  Low Salinity Enhanced Oil Recovery - Laboratory to Day One Field Implementation - LoSal EOR into the Clair Ridge Project , 2012 .

[3]  T. Austad,et al.  Water Based EOR by Wettability Alteration in Dolomite , 2016 .

[4]  T. Austad,et al.  Wettability alteration and improved oil recovery by spontaneous imbibition of seawater into chalk: Impact of the potential determining ions Ca2+, Mg2+, and SO42− , 2007 .

[5]  O. Torsæter,et al.  A coreflood investigation of nanofluid enhanced oil recovery , 2013 .

[6]  Abbas Firoozabadi,et al.  Recovery Mechanisms in Fractured Reservoirs and Field Performance , 2000 .

[7]  Tayfun Babadagli,et al.  Experimental Analysis of Primary and Secondary Oil Recovery From Matrix by Counter-Current Diffusion and Spontaneous Imbibition , 2004 .

[8]  G. Pope,et al.  A Coreflood Investigation of Low-Salinity Enhanced Oil Recovery , 2010 .

[9]  T. Austad,et al.  Smart Water as Wettability Modifier in Carbonate and Sandstone: A Discussion of Similarities/Differences in the Chemical Mechanisms , 2009 .

[10]  Jill S. Buckley,et al.  Improved Oil Recovery by Low-Salinity Waterflooding , 2011 .

[11]  H. Laborit,et al.  [Experimental study]. , 1958, Bulletin mensuel - Societe de medecine militaire francaise.

[12]  Martin J. Blunt,et al.  Thermally Induced Wettability Alteration To Improve Oil Recovery in Fractured Reservoirs , 2001 .

[13]  P. Brady,et al.  Functional Wettability in Carbonate Reservoirs , 2016 .

[14]  Behruz Shaker Shiran,et al.  Enhanced Oil Recovery (EOR) by Combined Low Salinity Water/Polymer Flooding , 2013 .

[15]  A. Shehata,et al.  Spontaneous Imbibition Study: Effect of Connate Water Composition on Low-Salinity Waterflooding in Sandstone Reservoirs , 2015 .

[16]  S. Shaddel,et al.  Alkali/Surfactant Improved Low-Salinity Waterflooding , 2015, Transport in Porous Media.

[17]  Ali Saeedi,et al.  Drivers of Low Salinity Effect in Carbonate Reservoirs , 2017 .

[18]  Dag Chun Standnes,et al.  Wettability alteration in chalk 2. Mechanism for wettability alteration from oil-wet to water-wet using surfactants , 2000 .

[19]  W. Rossen,et al.  Insights into the Mechanism of Wettability Alteration by Low-Salinity Flooding (LSF) in Carbonates , 2015 .

[20]  Ian Ralph Collins,et al.  LoSal Enhanced Oil Recovery: Evidence of Enhanced Oil Recovery at the Reservoir Scale , 2008 .

[21]  N. Morrow,et al.  An Experimental Study of Low Salinity Waterflooding and Spontaneous Imbibition , 2011 .

[22]  S. Patil,et al.  Low Salinity Cyclic Water Floods for Enhanced Oil Recovery on Alaska North Slope , 2013 .

[23]  Arnaud Lager,et al.  Impact of Brine Chemistry on Oil Recovery , 2007 .

[24]  Behruz Shaker Shiran,et al.  Wettability and Oil Recovery by Low Salinity Injection , 2012 .

[25]  Kine Christensen Navratil,et al.  An experimental study of low salinity EOR effects on a core from the Yme field , 2012 .

[26]  A. Skauge,et al.  Experimental Studies of Low Salinity Water Flooding Carbonate: A New Promising Approach , 2012 .

[27]  Shaddel Sina,et al.  CORE FLOOD STUDIES TO EVALUATE EFFICIENCY OF OIL RECOVERY BY LOW SALINITY WATER FLOODING AS A SECONDARY RECOVERY PROCESS , 2014 .

[28]  N. Morrow,et al.  Influence of brine composition and fines migration on crude oil/brine/rock interactions and oil recovery , 1999 .

[29]  S. Patil,et al.  Low Salinity Brine Injection for EOR on Alaska North Slope (ANS) , 2008 .

[30]  T. Austad,et al.  Evaluation of Low-Salinity Enhanced Oil Recovery Effects in Sandstone: Effects of the Temperature and pH Gradient , 2012 .

[31]  L. Lake,et al.  Enhanced Oil Recovery , 2017 .

[32]  K. Sorbie,et al.  Low salinity oil recovery - an experimental investigation , 2008 .

[33]  F. Carini,et al.  Low Salinity Oil Recovery: An Exciting New EOR Opportunity for Alaska's North Slope , 2005 .

[34]  George J. Hirasaki,et al.  SURFACE CHEMISTRY OF OIL RECOVERY FROM FRACTURED, OIL-WET, CARBONATE FORMATIONS , 2004 .

[35]  J. Schembre,et al.  Wettability alteration and oil recovery by water imbibition at elevated temperatures , 2006 .

[36]  T. Austad,et al.  Chemical Mechanism of Low Salinity Water Flooding in Sandstone Reservoirs , 2010 .

[37]  S. Clarke,et al.  Low Salinity Oil Recovery: Increasing Understanding of the Underlying Mechanisms , 2010 .

[38]  H. Nasr-El-Din,et al.  Efficiency of Oil Recovery by Low Salinity Water Flooding in Sandstone Reservoirs , 2011 .