Time-varying phase behavior characteristics of reservoir fluids and development technical strategies for hydrocarbon gas injection development

doi:10.3969/j.issn.1006-6535.2025.05.010

Abstract

Abstract: Aiming at the insufficient understanding of the mechanism by which the time-varying phase behavior characteristics of formation fluids during hydrocarbon gas injection development affect oil displacement efficiency,making it difficult to conduct fine control and improve oil recovery,high-pressure PVT experiments on typical well fluids were conducted to clarify the time-varying phase behavior characteristics of formation fluids during hydrocarbon gas injection development.Based on the time-varying fluid phase behavior,reservoir numerical simulation studies on the impact of fluid phase behavior changes on oil displacement efficiency were carried out,and technical strategies for hydrocarbon gas injection development in typical well groups considering the time-varying phase behavior characteristics of the reservoir were formulated and optimized.The study shows that after hydrocarbon gas injection development,the crude oil at the gas displacement front in the reservoir becomes lighter,while the residual oil at the gas displacement rear becomes heavier.During hydrocarbon gas injection development,the fluid characteristics of light oil in the reservoir near production wells shift to volatile oil fluid characteristics.Compared with injecting lean hydrocarbon gas,injecting rich hydrocarbon gas can reduce the oil-gas interfacial tension at the gas displacement rear and enhance the degree of oil-gas miscibility,thereby improving oil recovery.This research can provide a basis for formulating technical strategies for hydrocarbon gas injection development in reservoirs and offers important reference significance for CO₂ flooding development in reservoirs and gas injection development in condensate gas reservoirs.

Key words: reservoir, hydrocarbon gas injection, time-varying phase behavior, enhanced oil recovery, reservoir numerical simulation

CLC Number:

TE311

CHEN Lixin, JIANG Tongwen, LI Kaifen, LIN Qingjin, LIU Xinzhe, PAN Yi, YAO Jie, WU Keliu. Time-varying phase behavior characteristics of reservoir fluids and development technical strategies for hydrocarbon gas injection development[J]. Special Oil & Gas Reservoirs, 2024, 32(5): 85-92.

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