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Energies 2017, 10(4), 454; doi:10.3390/en10040454

The Performance of Polymer Flooding in Heterogeneous Type II Reservoirs—An Experimental and Field Investigation

1
Key Laboratory for Enhanced Oil & Gas Recovery of the Ministry of Education, Northeast Petroleum University, Daqing 163318, China
2
Department of Geological Sciences and Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA
3
McDougall School of Petroleum Engineering, University of Tulsa, Tulsa, OK 74104, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Mofazzal Hossain
Received: 12 January 2017 / Revised: 22 February 2017 / Accepted: 27 March 2017 / Published: 1 April 2017
(This article belongs to the Special Issue Oil and Gas Engineering)
View Full-Text   |   Download PDF [6536 KB, uploaded 1 April 2017]   |  

Abstract

The polymer flooding process has already been applied to the medium permeability type II reservoirs of the Daqing Oilfield (China) to enhance oil recovery. However, this process faces a number of challenges, such as the flooding efficiency, high injection pressure, formation blockage and damage, unbalanced absorption ratio, and economical justification. In this study, single-phase and two-phase flow experiments are performed to investigate polymer injection adaptability with natural cores of type II reservoirs. The enhanced oil recovery (EOR) effects of the polymer are studied by physical simulation experiments, and the results of application in an actual field are also presented. The results indicate that the flow characteristics and injection capability are dominated by the reservoir permeability in polymer flooding. Moreover, the adsorption of polymer molecules and the injection pressure gradient, which reflect formation damage, are affected more significantly by the concentration than by the molecular weight in type II reservoirs. Using the matching relationship, the injection-production process is stable, and additional oil recoveries of 10%–15% can be obtained in heterogeneous type II reservoirs with a high water saturation. This work is significant in that it further accelerates the application of polymer flooding EOR in medium permeability heterogeneous oilfields with high water saturation. View Full-Text
Keywords: polymer flooding; injection performance; residual resistance coefficient; enhanced oil recovery (EOR); Daqing Oilfield polymer flooding; injection performance; residual resistance coefficient; enhanced oil recovery (EOR); Daqing Oilfield
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Zhong, H.; Zhang, W.; Fu, J.; Lu, J.; Yin, H. The Performance of Polymer Flooding in Heterogeneous Type II Reservoirs—An Experimental and Field Investigation. Energies 2017, 10, 454.

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