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Investigation on Mechanisms of Polymer Enhanced Oil Recovery by Nuclear Magnetic Resonance and Microscopic Theoretical Analysis |
| ZHANG Ji-Cheng1;SONG Kao-Ping1;LIU Li2;YANG Er-Long1 |
| 1Key Laboratory of Enhanced Oil Recovery of Ministry of Education of China, Daqing Petroleum Institute, Daqing 1633182Institute of Porous Flow and Fluid Mechanics, National Petroleum Corporation of China, Langfang 065007 |
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| Cite this article: |
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ZHANG Ji-Cheng, SONG Kao-Ping, LIU Li et al 2008 Chin. Phys. Lett. 25 1750-1752 |
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Abstract Polymer flooding is an efficient technique to enhance oil recovery over water flooding. There are lots of discussions regarding the mechanisms for polymer flooding enhancing oil recovery. The main focus is whether polymer flooding
can increase sweep efficiency alone, or can increase both of sweep efficiency and displacement efficiency. We present a study on this problem. Oil displacement experiments on 4 natural cores show that polymer flooding can increase oil recovery efficiency by more than 12% over water. Moreover, photos are taken by the nuclear magnetic resonance (NMR) method both after water flooding and after polymer flooding, which show remaining oil saturation distribution at the middle cross section and the central longitudinal section. Analyses of these photos demonstrate that polymer flooding can increase both sweep efficiency and displacement efficiency.
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47.55.Mh
47.50.+d
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Received: 02 January 2008
Published: 29 April 2008
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