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

Bin Huang, Wei Zhang, Rui Xu, Zhenzhong Shi, Cheng Fu, Ying Wang and Kaoping Song
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Bin Huang: College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, 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
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

Energies, 2017, vol. 10, issue 7, 1-10

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.

Keywords: matching relationship; polymer molecular weight; reservoir permeability; ASP flooding; morphology of molecular aggregation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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