Effectiveness of Gas Injection in Fractured Vuggy Reservoirs Connected to Caves

doi:10.11885/j.issn.1674-5086.2015.05.19.03

Abstract

Abstract: Oil flowing production or water injection replacement is mainly applied to carbonate reservoirs, which may result in a large quantity of oil remaining in the caverns. To solve the problem, we conducted research on the effects of gas injection in carbonate reservoirs. First, the fractured and vuggy reservoir communication cave model was simplified, and computational analysis of the adaptability of nitrogen, methane, and carbon dioxide was performed. Physical simulation was applied to flowing, water flooding, and gas injection experiments, and the gas injection development analysis method was developed. The results demonstrate that in such reservoirs, the gas displacement effect is poor with larger scale of bottom water and better physical properties of fractured and porous reservoirs. With an increase in the gas injection cycle, the fracture-cave elastic energy increases. Thus, in field production, we could carry out the gas injection operation in fracture caves, with poor physical properties in the upper fractured and porous reservoirs, and caves with smaller quantities of bottom water. Establishing linear equations of elastic production rate and compression coefficient can predict the gas volume, energy, and water cycle output parameters and provide a foundation for gas injection effect evaluation.

Key words: carbonate reservoir, fractured vuggy reservoir, physical simulation, gas injection, nitrogen

CLC Number:

TE341

ZHU Wenqing, CHANG Baohua, XIONG Wei, GAO Shusheng. Effectiveness of Gas Injection in Fractured Vuggy Reservoirs Connected to Caves[J]. 西南石油大学学报(自然科学版), 2017, 39(1): 100-106.

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