Development Status and Prospect of EOR Technology in Low-Permeability Reservoirs

doi:10.3969/j.issn.1006-6535.2023.01.001

Abstract

Abstract: Low-permeability reservoirs are rich in reserves, with great commercial value, but they are defective in poor porosity and permeability, high reservoir heterogeneity, poor water absorption capacity, etc., increasing the technical difficulties in development. To address these defects, the technology of enhancing oil recovery in low-permeability reservoirs was discussed based on extensive reference. The study results show that low-permeability reservoirs (10.0-50.0 mD) were principally developed by polymer flooding, polymer-surfactant binary flooding, microbial flooding and in-depth profile control and surfactant flooding, extra-low-permeability reservoirs (1.0-10.0 mD) chiefly developed by surfactant flooding, foam flooding and nano-material flooding, and ultra-low-permeability reservoirs (0.1-1.0 mD) primarily developed by imbibition, CO₂ flooding, N₂ flooding and air flooding, etc. It is the development trend of low-permeability reservoir development in China to gradually improve the oil-displacement mechanism of the replacement medium, develop economical and efficient environment-friendly oil displacement system and promote its application in the field practice. This study provides technical support for efficient development of low-permeability reservoirs.

Key words: low-permeability reservoirs, chemical flooding, gas flooding, enhanced oil recovery, peak carbon dioxide emissions, carbon neutrality

CLC Number:

TE357

Wang Zhe, Cao Guangsheng, Bai Yujie, Wang Peilun, Wang Xin. Development Status and Prospect of EOR Technology in Low-Permeability Reservoirs[J]. Special Oil & Gas Reservoirs, 2023, 30(1): 1-13.

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