Study on Oil Recovery Enhancement by Gas-Injection Stimulation Assisted by Water Flooding in Complex Reservoir with Small Fault Block

doi:10.3969/j.issn.1006-6535.2021.04.016

Abstract

Abstract: In complex reservoir with small fault block, water or gas injection is difficultly to be applied to the whole reservoir and has little effect on the further developing the remaining oil. In order to improve the recovery efficiency of remaining oil in the complex reservoir with small fault block during the high water cut stage, numerical simulation methods were employed to explore the gas-injection stimulation assisted by water flooding, and its reservoir adaptability was analyzed by economic and efficiency indicators. According to the development effect of typical models under different measures, the optimal development mode of this method was determined as follows: energy supplement-energy enhancement bu well shut-in-shut-in stage-development stage; its technical limits were further determined as follows: the ratio of gas and water injection rates was 6.5 to 8.5, the pressure ratio between Stage 2 to Stage 1 was 0.1 to 0.3, and the injection-production ratio was 0.4 to 0.6. The study results were applied to Block A-7 of Shengli Oilfield, and the simulation prediction showed that this method improved the oil recovery by 12.96 percentage points compared with basic water-flooding development. The study results play an important guiding role in the development measure adjustment and oil recovery enhancement in complex reservoir with small fault block during the high water cut stage.

Key words: gas-injection stimulation assisted by water flooding, oil recovery enhancement, artificial gas cap, numerical simulation, complex reservoir with small fault block, Shengli Oilfield

CLC Number:

TE347

Qu Shiyuan, Jiang Hanqiao, Li Junjian, Zhou Yu, Ma Kang, Chang Yuanhao. Study on Oil Recovery Enhancement by Gas-Injection Stimulation Assisted by Water Flooding in Complex Reservoir with Small Fault Block[J]. Special Oil & Gas Reservoirs, 2021, 28(4): 116-122.

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