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Advances in Materials Science and Engineering
Volume 2015, Article ID 139284, 6 pages
http://dx.doi.org/10.1155/2015/139284
Research Article

Study on Relation between Hydrodynamic Feature Size of HPAM and Pore Size of Reservoir Rock in Daqing Oilfield

1Northeast Petroleum University, Daqing, Heilongjiang 163318, China
2Oil Recovery Plant No. 2, Daqing Oilfield Corp. Ltd., Daqing, Heilongjiang 163256, China
3EOR Research Institute, China University of Petroleum-Beijing, Beijing 102249, China

Received 20 November 2014; Accepted 4 March 2015

Academic Editor: Peter Majewski

Copyright © 2015 Qing Fang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The flow mechanism of the injected fluid was studied by the constant pressure core displacement experiments in the paper. It is assumed under condition of the constant pressure gradient in deep formation based on the characteristic of pressure gradient distribution between the injection and production wells and the mobility of different polymer systems in deep reservoir. Moreover, the flow rate of steady stream was quantitatively analyzed and the critical flow pressure gradient of different injection parameters polymer solutions in different permeability cores was measured. The result showed that polymer hydrodynamic feature size increases with the increasing molecular weight. If the concentration of polymer solutions overlaps beyond critical concentration, then molecular chains entanglement will be occur and cause the augment of its hydrodynamic feature size. The polymer hydrodynamic feature size decreased as the salinity of the dilution water increased. When the median radius of the core pore and throat was 5–10 times of the polymer system hydrodynamic feature size, the polymer solution had a better compatibility with the microscopic pore structure of the reservoir. The estimation of polymer solutions mobility in the porous media can be used to guide the polymer displacement plan and select the optimum injection parameters.