Improved Approach to Evaluating the Hydrodynamic Performance of Polymers in the Early Stage of Polymer Flooding

Liu, Fan; Jiang, Hanqiao; Wu, Xia

doi:10.1007/s10553-016-0678-1

Cited by 2 publications

(2 citation statements)

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“…The elastic effect cannot be ignored because it directly increases the viscosity of the displacing phase 17 . Under the influence of porous media, the elastic effect of polymers exhibits elastic viscosity, leading to an effective viscosity of the polymer solutions in the porous media that differs from the measured viscosity on the ground 18,19 . Some scholars have studied the effective viscosity of polymers in porous media, which is much higher than the measured apparent viscosity.…”

Section: Introductionmentioning

confidence: 99%

“…17 Under the influence of porous media, the elastic effect of polymers exhibits elastic viscosity, leading to an effective viscosity of the polymer solutions in the porous media that differs from the measured viscosity on the ground. 18,19 Some scholars have studied the effective viscosity of polymers in porous media, which is much higher than the measured apparent viscosity. They further argued that the effective viscosity of polymer solutions in porous media is the sum of viscous viscosity and elastic viscosity.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing heavy‐oil displacement efficiency through viscoelasticity of polymer solution by investigating the viscosity limit of crude oil: An experimental study

Xue,

Zhu,

et al. 2024

Energy Science & Engineering

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The world is rich in ordinary heavy‐oil resources. Exploring the limit of the crude oil viscosity limits can further expand the application of polymer flooding technology in heavy‐oil reservoirs and improve the development efficiency of heavy‐oil reservoirs. On the basis of the polymer flooding that has been implemented in the Bohai offshore oilfield, this study characterized the in situ viscoelasticity of the polymer solution SNF3640C. We compared the polymer flooding and glycerol flooding performance in low‐viscous oil reservoirs (with a viscosity of 6.5 cp) and high‐viscous oil reservoirs (with a viscosity of 65 cp) by conducting microscopic dead‐end experiments and macroscopic core‐flooding experiments, and then analyzing the impact of polymer's viscoelasticity on the oil displacement efficiency of heavy oil. Finally, multiple crude oils with a wide range of viscosity were used to explore the crude oil viscosity limits under which the efficiency of heavy‐oil displacement could be improved through polymer viscoelasticity. The results demonstrate that: (1) the SNF3640C polymer solution can exhibit a certain degree of viscoelasticity in deep formation. At a distance of 140 m from the wellbore in the reservoir, a solution with a concentration of 1500 mg/L can still have a first normal stress difference of 2.5 Pa. Polymers can effectively improve the efficiency of heavy‐oil displacement through elastic action. (2) The viscosity limit that can improve the efficiency of heavy‐oil displacement under current experimental conditions does not exceed 5486 cp. The efficiency of polymer flooding for crude oil has decreased to 31.68%, and the contribution of elastic flooding is only 1.5%. The research method of using viscous glycerol as a comparison to demonstrate the contribution of polymer elasticity to oil displacement effectiveness effectively solves the problem of isolating the contribution by polymer solution's viscosity and elasticity, and clarifies the development direction of polymer flooding for developing heavy crude oil. Enhancing the elastic effect of polymer solution in porous media can increase the viscosity range of polymer flooding heavy oil.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%