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Abstract: A streamline type mathematical model has been developed which may be used to study oil recovery by viscous waterfloods for any desired well spacing. The model was used to study the combined effects of permeability stratification, polymer concentration and viscous water slug size for a five spot injection pattern. Five different permeability profiles ranging from a homogeneous to a highly stratified reservoir were studied. It was found that viscous water floods show greater percentage increase… Show more

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“…Additionally, the effect of temperature could accelerate oxygen free radical reactions which could affect the polymer performance at 23, 49, and 60 °C [ 100 ]. In the case of rheology, Wang and Caudle [ 101 ] discussed that concentrated polymer slug is vital for efficient oil recovery. However, the authors highlighted that increasing the polymer concentration, in contrast, could affect the required slug.…”
Section: Screening Design Criteria and Optimum Polymer Concentratmentioning
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“…Additionally, the effect of temperature could accelerate oxygen free radical reactions which could affect the polymer performance at 23, 49, and 60 °C [ 100 ]. In the case of rheology, Wang and Caudle [ 101 ] discussed that concentrated polymer slug is vital for efficient oil recovery. However, the authors highlighted that increasing the polymer concentration, in contrast, could affect the required slug.…”
Section: Screening Design Criteria and Optimum Polymer Concentratmentioning
“…In addition, connate water salinity can adversely affect the polymer flood efficiency, unless it is considered during the polymer flooding design process. Wang and Caudle (1970) suggested that the effect of connate water on oil recovery becomes less significant with the increase of either the permeability variation or mobility ratio. While polymers are used to achieve lower favourable mobility ratios, the presence of connate water in highly heterogeneous reservoirs means the possibility of un-swept zones behind very low permeability areas.…”
Section: Upscaling For Polymer Floodingmentioning
“…Slug size is usually determined by the level of adsorption, the heterogeneity, the expected level of fingering and the well spacing. The aim is to ensure that the slug maintains its integrity throughout the displacement between injection and Wang and Caudle (1970) suggested that large slug sizes can be beneficial for highly stratified reservoirs or reservoirs with heavy oil. He also suggested that a smaller slug size is enough for uniform reservoirs (Wang and Caudle, 1970).…”
Section: Slug Sizementioning
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“…Polymers have been commonly employed in the petroleum industry since 1960s to increase water viscosity significantly. The polymers used in EOR processes decreases the mobility ratio to increase the sweep efficiency [1][2][3]. HPAM or partially hydrolysed polyacrylamide (PAM) is the most largely used synthetic linear chain polymer in oil recovery processes [4].…”
Section: Introductionmentioning