Re-evaluation of Medium-low Permeability Sandstone Reservoirs in the Later Stage of Water Flooding and Strategies to Improve Recovery Efficiency

doi:10.3969/j.issn.1006-6535.2024.04.017

Abstract

Abstract: In order to explore effective approaches to enhance oil recovery in the late stage of water-flooded development in reservoirs with medium-low permeability and high-ultra-high water content,this study,taking Nanhu Oilfield as an example,deepens the understanding of reservoir microscopic characteristics through mineral analysis and SEM methods,and investigates the feasibility and application effects of dispersed particle gel in improving oil recovery using the combination of nuclear magnetic resonance and mercury injection methods.The results show that Nanhu Oilfield is featured with well-developed large pore channels, obvious speed sensitivity and water sensitivity.Severe water breakthrough is the main reason for inefficient development,while key factors for improving development effectiveness include low-rate water injection,maintaining reservoir energy,and controlling water channeling.The dispersed particle gel can effectively inhibit water breakthrough and improve the mobilization ability of residual oil in medium and small pores. The oil recovery ratio in small pores of the core samples, in medium pores increased by 52.83 percentage points by 34.60 percentage points,respectively,after dispersed particle gel flooding,and the oil recovery increased,and the overall recovery ratio increased by 33.14 percentage points,indicating a significant improvement in development effectiveness.The findings of this study can provide references for improving the development effectiveness of reservoirs with high water content.

Key words: medium-low permeability, reservoir microscopic characteristics, water channeling, technical strategies, dispersed particle gel, Nanhu Oilfield

CLC Number:

TE343

Chen Hongcai, Wang Zhaokai, Jin Zhongkang, Wang Teng, Sun Yongpeng, Zhao Guang. Re-evaluation of Medium-low Permeability Sandstone Reservoirs in the Later Stage of Water Flooding and Strategies to Improve Recovery Efficiency[J]. Special Oil & Gas Reservoirs, 2024, 31(4): 133-141.

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