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Parameter Evaluation of CO2-assisted Gravity Flooding Development in Low Permeability Reservoir
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Ying WANG1, 2, Ya-guang QU1, 2, *, Bin WANG3, Ming LU4, Xi JIANG4, Jian-xin LI5, Xu GONG6
Science Technology and Engineering | 2025, 25(1) : 137 - 145
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Science Technology and Engineering | 2025, 25(1): 137-145
• Papers·Petroleum and Natural Gas Industry •
Parameter Evaluation of CO2-assisted Gravity Flooding Development in Low Permeability Reservoir
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Ying WANG1, 2, Ya-guang QU1, 2, *, Bin WANG3, Ming LU4, Xi JIANG4, Jian-xin LI5, Xu GONG6
Affiliations
  • 1. School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
  • 2. Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Wuhan 430100, China
  • 3. Research Institute of Petroleum Exploration and Development of Changqing Oilfield Company, CNPC, Xi’an 710018, China
  • 4. Youxin Exploration and Development Service Co., Ltd., Huabei Oilfield, Renqiu 062552, China
  • 5. Oil and Gas Field Production Capacity Construction Division, Tarim Oilfield Company, PetroChina, Korla 841000, China
  • 6. Tarim Oilfield Company, PetroChina, Korla 841000, China
Published: 2025-01-08 doi: 10.12404/j.issn.1671-1815.2401180
Outline
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The effect of water flooding development in low permeability reservoir is generally poor, and CO2 flooding can effectively improve the degree of crude oil recovery. In order to analyze various factors affecting the effect of CO2-assisted gravity flooding, based on the research mechanism of gas-injection-assisted gravity flooding, a mechanism model of one injection and one production was established to analyze the influence law of geological factors and development factors, and the orthogonal experimental design method and Shapley value method were used for multi-factor analysis. The results show that the positive rhythm reservoir is more suitable for CO2-assisted gravity flooding. Reservoir dip angle, average permeability and gas injection velocity are positively correlated with development effect. The ratio of vertical permeability to horizontal permeability and the difference of permeability stage were negatively correlated with the development effect. If the ratio of gas injection and dimensionless horizontal well section length is set to 0.8, the CO2-assisted gravity flooding effect can be effectively improved. The ratio of vertical permeability to horizontal permeability has the highest influence on CO2-assisted gravity flooding. The research results provide technical guidance and theoretical support for improving the development effect of CO2-assisted gravity flooding in low permeability reservoirs.

low permeability reservoir  /  CO2 flooding  /  geological factors  /  development factors  /  orthogonal experimental design  /  Shapley value
Ying WANG, Ya-guang QU, Bin WANG, Ming LU, Xi JIANG, Jian-xin LI, Xu GONG. Parameter Evaluation of CO2-assisted Gravity Flooding Development in Low Permeability Reservoir[J]. Science Technology and Engineering, 2025 , 25 (1) : 137 -145 . DOI: 10.12404/j.issn.1671-1815.2401180
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Year 2025 volume 25 Issue 1
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Article Info
doi: 10.12404/j.issn.1671-1815.2401180
  • Receive Date：2024-02-23
  • Online Date：2025-07-29
  • Published：2025-01-08
Article Data
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History
  • Received：2024-02-23
  • Revised：2024-10-11
Funding
Affiliations
    1. School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
    2. Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Wuhan 430100, China
    3. Research Institute of Petroleum Exploration and Development of Changqing Oilfield Company, CNPC, Xi’an 710018, China
    4. Youxin Exploration and Development Service Co., Ltd., Huabei Oilfield, Renqiu 062552, China
    5. Oil and Gas Field Production Capacity Construction Division, Tarim Oilfield Company, PetroChina, Korla 841000, China
    6. Tarim Oilfield Company, PetroChina, Korla 841000, China
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