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Research on improving oil displacement efficiency using viscoelastic behavior of polymer |
WU Wen xiang, WANG De min
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(College of Petroleum Engineering in Northeast Petroleum University, Daqing 163318, China)
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Abstract: |
Some physical simulation experiments were conducted. The effects of the first normal stress difference N1, the slope of the first normal stress difference SN1 and Wesson Borg number on oil displacement efficiency and residual oil saturation based on slightly oleophilic artificial physical model were studied. Under the same viscosity conditions, the oil displacement efficiency was investigated. Two high concentration polymer flooding field tests were carried out in Daqing Oilfield. The results demonstrate that with the increase of the first normal stress difference, the slope of the first normal stress difference and Wesson Borg number, the oil displacement efficiency increases and residual oil saturation decreases. Under the same viscosity conditions, the oil displacement efficiency of polymer flooding was higher than that of the glycerol flooding significantly because of the elasticity of polymer. The oil recovery efficiency is greatly improved because of high viscoelastic behavior of high concentration polymer. |
Key words: viscoelasticity the first normal stress difference slope of the first normal stress difference Wesson Borg number oil displacement efficiency residual oil saturation field test |
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