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Journal of Porous Media

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ISSN Print: 1091-028X

ISSN Online: 1934-0508

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MICROSCOPIC SWEEP EFFICIENCY OF POLYMER FLOODING IN CONGLOMERATE RESERVOIRS

Volume 22, Issue 11, 2019, pp. 1383-1395
DOI: 10.1615/JPorMedia.2019025097
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Hongxian Liu
Faculty of Petroleum, China University of Petroleum - Beijing at Karamay, Karamay, China
Tao Wan
Faculty of Petroleum, China University of Petroleum - Beijing at Karamay, Karamay, China
Weifeng Lv
Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China; State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, CNPC, Beijing, China
Changfu Xu
Research Institute of Exploration and Development of Xinjiang Oilfield Company, PetroChina, Karamay, China
Ninghong Jia
State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, CNPC, Beijing, China
Xiaoguang Wang
School of Geoscience, China University of Petroleum (Huadong), China; Research Institute of Exploration and Development of Xinjiang Oilfield Company, PetroChina, Karamay, China
Yukun Chen
Research Institute of Exploration and Development of Xinjiang Oilfield Company, PetroChina, Karamay, China

ABSTRACT

The objective of this paper is to investigate the microscopic sweep efficiency of polymer flooding in conglomerate reservoirs using computed tomography (CT) scanning and nuclear magnetic resonance (NMR) technology. The microscopic sweep efficiency was studied at two levels: core scale and pore scale. By monitoring the core flooding process using a CT scanning system, the saturation profile along the core and the reconstructed CT images of core sections during the displacement process were obtained. The microscopic sweep efficiency and the displacement mechanisms of polymer flooding in conglomerate reservoirs were analyzed by CT scanning results. The results showed that the oil in the rich oil saturation regions was preferably produced, but oil in the low oil saturation regions can't be mobilized by polymer flooding. The dominant flow channels were observed due to the strong heterogeneity of conglomerate cores during the waterflooding process, resulting in a low waterflooding oil recovery. The NMR experimental results showed that oil mobilization firstly occurred in the large pores in the waterflooding process. The main contribution to oil recovery is from mesopores and macropores during waterflooding. A distinct feature of polymer flooding over waterflooding is to improve the microscopic sweep efficiency. During polymer flooding, most of the oil in the macropores and mesopores was greatly reduced by polymer flooding, although oil in the micropores remained immobilized.

KEY WORDS: polymer flooding, pore structure, conglomerate reservoirs, computed tomography (CT), nuclear magnetic resonance (NMR)
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