Discussion on the Development Model of CO2 Flooding in Low Permeability Reservoir in North Jiangsu

doi:10.11885/j.issn.1674-5086.2019.10.25.02

Abstract

Abstract: CO₂ flooding is an effective method for improving the develop effect of low-permeability reservoir. Sinopec East China Oil and Gas Field has been conducting field experiments in North Jiangsu low-permeability reservoir for 30 years. According to the experience, the current gas injecting blocks are divided into 4 types based on different reservoir characteristics and injecting periods. This paper elaborates the corresponding developing mode for each type of block. Among them, synchronizing injection is suitable for low-permeability reservoirs which are deep and water-sensitive; injection after exhaustion can substantially raise the single well deliverability of high-inclination-angle low-permeability reservoirs which are thin and steadily spreaded; the water-convert-gas injection is suitable for reservoirs with medium-high water cut after water injection; the secondary gas injection development mode is suitable for the low-permeability reservoir which is injected again after gas injection development. The recovery can be increased again by controlling gas channeling through the comprehensive adjustment of development series, injection production structure, injection mode and injection profile. The researching result has a reference significance for choosing CO₂ flooding mode in low-permeability reservoirs.

Key words: low-permeability, CO₂ flooding, developing mode, oil-displacement mechanism, representative instance, reservoir type

CLC Number:

TE341

CHEN Zuhua, SUN Lei, YANG Zhengmao, ZHENG Yongwang, YU Xiaowei. Discussion on the Development Model of CO₂ Flooding in Low Permeability Reservoir in North Jiangsu[J]. 西南石油大学学报(自然科学版), 2020, 42(3): 97-106.

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Discussion on the Development Model of CO₂ Flooding in Low Permeability Reservoir in North Jiangsu

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