Study on Impact of Compositional Gradient on Volatile Oil Reservoir Development

WANG Wendong, DING Shengjun, HE Xinfei, LÜ Yuan, JIN Xiaolin


The existing of compositional gradient in volatile oil reservoir makes the reservoir special. It will have great significance in calculating reserves, determining reasonable development mode and improving volatile oil recovery,if the composition profile and vertical distribution characteristic of the underground fluid are considered, when developing volatile oil reservoir. Based on the theory of compositional gradient[1], the paper analyzed the compositional gradient in various kinds of reservoir, researched the impact of compositional gradient on reserves estimation in volatile oil reservoir, and then evaluated the final recovery efficiency of different development modes (depletion, water-flood, gas injection) with the method of compositional numerical simulation. Results show that: If the reservoir fluid contains more light components, the compositional gradient phenomenon will be more obvious; by choosing fluid samples at the middle of the reservoir to calculate reserves of the volatile oil reservoir, accurate value will be obtained; when developing volatile oil reservoirs, the compositional gradient phenomenon affects greater on recovery efficiency of gas injection development than that of depletion and water-flood development. The achievements provide theoretical guidance and basis for volatile oil reservoir development.
Key words: Volatile oil reservoir; Compositional gradient; Compositional simulation; Development mode; Phase behavior


Volatile oil reservoir; Compositional gradient; Compositional simulation; Development mode; Phase behavior

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