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A Study on the Matching Relationship of Polymer Molecular Weight and Reservoir Permeability in ASP Flooding for Duanxi Reservoirs in Daqing Oil Field

Author

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  • Bin Huang

    (College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
    Beijing Deweijiaye Technology Corporation Ltd., Beijing 100027, China)

  • Wei Zhang

    (College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China)

  • Rui Xu

    (College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China)

  • Zhenzhong Shi

    (College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China)

  • Cheng Fu

    (College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
    Post-Doctoral Scientific Research Station, Daqing Oilfield Company, Daqing 163413, China)

  • Ying Wang

    (Harold Vance Department of Petroleum Engineering, Texas A&M University, College Station, TX 77843, USA)

  • Kaoping Song

    (College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China)

Abstract

In order to determine the matching relationship of polymer molecular weight and reservoir permeability in ASP (alkaline/surfactant/polymer) flooding, a number of core flooding experiments with different polymer molecular weights are performed. Two types of curves for the relationship between the pressure difference and the injection pore volume multiples are obtained. One describes the characteristics of the core plugging; the other describes the characteristics of the injection well. The relationship between the polymer molecular cyclotron radius and the pore throat radius used to describe the relationship between the polymer molecular weight and the core permeability. The results indicate that when the ratio of the pore throat radius ( r h ) to the polymer molecular cyclotron radius ( r p ) is greater than 7, the injection of ASP system with a variety of molecular weights will not be blocked; on contrary, when the ratio is less than 7, the core will be blocked. The range of water permeability of the core is determined by the value of the polymer molecular weight. The ratio between the pore throat radius ( r h ) to the polymer molecular cyclotron radius ( r p ) for the ASP system is greater than that of polymer system ( r h /r p = 5). A scanning electron microscope (SEM) is used to compare the morphology of polymer molecules in polymer solution and ASP solution, and shows that the dimension of polymer molecular coils in ASP solution is smaller than that in polymer solution, which is caused by the double effect of alkali and surfactant.

Suggested Citation

  • Bin Huang & Wei Zhang & Rui Xu & Zhenzhong Shi & Cheng Fu & Ying Wang & Kaoping Song, 2017. "A Study on the Matching Relationship of Polymer Molecular Weight and Reservoir Permeability in ASP Flooding for Duanxi Reservoirs in Daqing Oil Field," Energies, MDPI, vol. 10(7), pages 1-10, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:951-:d:104117
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    References listed on IDEAS

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    1. Olajire, Abass A., 2014. "Review of ASP EOR (alkaline surfactant polymer enhanced oil recovery) technology in the petroleum industry: Prospects and challenges," Energy, Elsevier, vol. 77(C), pages 963-982.
    2. Bin Huang & Wei Zhang & Huan Liu & Cheng Fu & Pengxin Feng & Ying Wang, 2017. "A Study on the Optimization of Surfactants in the Main and Vice Slug in Weak Base ASP Flooding," Energies, MDPI, vol. 10(3), pages 1-14, March.
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    Cited by:

    1. Juan Zhao & Hongfu Fan & Qing You & Yi Jia, 2017. "Distribution and Presence of Polymers in Porous Media," Energies, MDPI, vol. 10(12), pages 1-13, December.

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