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Energies 2017, 10(7), 951; doi:10.3390/en10070951

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

1
College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
2
Beijing Deweijiaye Technology Corporation Ltd., Beijing 100027, China
3
Post-Doctoral Scientific Research Station, Daqing Oilfield Company, Daqing 163413, China
4
Harold Vance Department of Petroleum Engineering, Texas A&M University, College Station, TX 77843, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Moran Wang
Received: 16 June 2017 / Revised: 30 June 2017 / Accepted: 5 July 2017 / Published: 9 July 2017
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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 (rh) to the polymer molecular cyclotron radius (rp) 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 (rh) to the polymer molecular cyclotron radius (rp) for the ASP system is greater than that of polymer system (rh/rp = 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. View Full-Text
Keywords: matching relationship; polymer molecular weight; reservoir permeability; ASP flooding; morphology of molecular aggregation matching relationship; polymer molecular weight; reservoir permeability; ASP flooding; morphology of molecular aggregation
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Huang, B.; Zhang, W.; Xu, R.; Shi, Z.; Fu, C.; Wang, Y.; Song, K. A Study on the Matching Relationship of Polymer Molecular Weight and Reservoir Permeability in ASP Flooding for Duanxi Reservoirs in Daqing Oil Field. Energies 2017, 10, 951.

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