Core and Log Determination of Residual Oil After Waterflooding - Two Case Histories

Strange, L.K.; Baldwin, W.F.

doi:10.2118/3786-ms

All Days 1972

DOI: 10.2118/3786-ms

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Core and Log Determination of Residual Oil After Waterflooding - Two Case Histories

L.K. Strange

W.F. Baldwin

Abstract: should provide much better oil saturation information in waterflmded cores than iS pOS-Two sandstone fields which are approaching sible using conventional core barrels. the economic limit for waterflooding were considered as locations for improved water-

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Residual Oil Saturation Determination – Case Studies in Sandstone and Carbonate Reservoirs

et al. 2013

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In petroleum reservoirs only a small fraction of the original oil-in-place is economically recovered by primary, secondary, and tertiary recovery mechanisms. A considerable amount of hydrocarbon ends up unrecovered or trapped due to microscopic phase trapping in porous media which results in an oil recovery factor typically less than 50%. Waterflooding is by far the most widely used method to increase oil recovery. The oil that remains in the porous media after waterflooding is called remaining oil saturation (ROS) which is larger than the relative permeability residual oil saturation (Sorw or simply Sor). This residual oil saturation varies depending on lithology, pore size distribution, permeability, wettability, fluid characteristics, recovery method, and production scheme. The Sor represents a statistical average over a wide range of pore scale residual saturations with in a representative elementary volume (REV). Determination of the residual oil saturation of a reservoir is a key parameter for reserve assessment and recovery estimates. Further, reliable Sor data is important for investigation of potential incremental recovery under Enhanced Oil Recovery (EOR) methods. Various residual oil saturation measurement techniques are available both at laboratory and field scale. None of the techniques can be regarded as a single best method of determining Sor. Depending on the complexity of the reservoir under study, combinations of methods are always advisable for appropriate Sor determination. This paper catalogues a number of field case studies which use different techniques of determining Sor and ROS in sandstone and carbonate reservoirs.

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Residual Oil Saturation Determination – Case Studies in Sandstone and Carbonate Reservoirs

et al. 2013

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Core and Log Determination of Residual Oil After Waterflooding - Two Case Histories

Abstract: should provide much better oil saturation information in waterflmded cores than iS pOS-Two sandstone fields which are approaching sible using conventional core barrels. the economic limit for waterflooding were considered as locations for improved water-

Cited by 1 publication

References 0 publications

Residual Oil Saturation Determination – Case Studies in Sandstone and Carbonate Reservoirs

Residual Oil Saturation Determination – Case Studies in Sandstone and Carbonate Reservoirs

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