Study and application of a microbial enhanced oil recovery system for the heavy oil reservoir in the Keqian 10 Well Area

doi:10.3969/j.issn.1006-6535.2026.03.008

Abstract

Abstract: After more than 20 years of high-rate and high-efficiency steam-injection development,the heavy oil reservoir in the Keqian 10 well Area of the Junggar Basin has entered the“dual-high”stage and become a“dual-negative”reservoir,resulting in the shutdown of oil wells over a large area.To investigate the potential for resuming production in this well area,the characteristics of microbial communities under steam-flooding conditions were studied through experimental evaluation,reservoir engineering analysis and numerical simulation,and a microbial enhanced oil recovery system was established.The results show that the steam-unswept zone in the Keqian 10 well Area is rich in functional microorganisms for oil recovery,providing a basis for the activation and utilization of indigenous microorganisms.The microbial enhanced oil recovery system is indigenous microorganisms+Strain 6-2+an activator.The field test was conducted using an inverted five-spot well pattern,achieving a cumulative oil production of 8 750 t;basic operating costs decreased from RMB 2 057/t under steam flooding to RMB 577/t.This study provides a reference for improving the quality and efficiency of shallow heavy oil development,enhancing oil recovery,and establishing replacement technologies for green and low-carbon development of heavy oil.

Key words: microbial enhanced oil recovery system, heavy oil reservoir, microbial community structure, enhanced oil recovery, the Keqian 10 Well Area

CLC Number:

TE357

ZHENG Aiping, JI Nan, HUANG Houchuan, SONG Dong, LI Sijie, MAIMAITI Guligeinaer. Study and application of a microbial enhanced oil recovery system for the heavy oil reservoir in the Keqian 10 Well Area[J]. Special Oil & Gas Reservoirs, 2026, 33(3): 72-78.

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