A Study on the Formation Conditions and Influencing Factors of Secondary Gas Cap in Oil Reservoirs Conversion into Gas Storage

doi:10.11885/j.issn.1674-5086.2025.12.15.01

Abstract

Abstract: With the transformation of China's energy structure and the growth of natural gas consumption demand, the coordinated development of oil and gas has become an important development direction. It is of great significance to reconstruct gas storage in old reservoirs to revitalize oilfield assets and improve regional peak shaving and gas storage capacity. In the process of reservoir construction, the formation and migration of secondary gas cap is the key to the synergistic extraction, drainage and expansion of gas storage and the formation of high-speed injection and production capacity in the later stage, which is the core problem affecting the efficient capacity of gas storage. This paper explores the formation conditions and migration rules of secondary gas cap, and provides theoretical support for gas drive expansion scheme. Based on physical simulation, numerical simulation and reservoir engineering methods, the changes of gas saturation and formation pressure are analyzed to determine the critical conditions for the formation of secondary gas cap, and to reveal the influence mechanism of well pattern, formation dip angle, reservoir heterogeneity and other factors on the development and migration of gas cap. The results show that the well pattern and formation dip angle are the main controlling factors for the stability of secondary gas cap, and the strong heterogeneity of reservoir will inhibit the uniform expansion of gas cap. The study clarifies the key control parameters of gas cap evolution, provides a basis for optimizing the injection-production system, and has theoretical and engineering guiding significance for the coordinated development of oil and gas and the efficient construction of gas storage.

Key words: sandstone reservoir, gas storage, secondary gas cap, numerical simulation, optimization of injection and production parameters

CLC Number:

TE972
P624

MA Xiaoli, LI Cong, JIANG Mingjie, GU Xiao, XIN Chunyan, TIAN Zhongjing. A Study on the Formation Conditions and Influencing Factors of Secondary Gas Cap in Oil Reservoirs Conversion into Gas Storage[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(4): 11-22.

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