Scholarlink

The feasibility of CO2-assisted associated gas in enhancing oil recovery is discussed. Firstly, numerical simulations of gas flooding at field scale are conducted. Analysis show that enhanced cumulative oil production of gas flooding is determined by oil components extraction effect and gas flooding swept area. The oil components extraction effect of CO2 is better than natural gas, but CO2 flooding swept area is the smallest among CO2 flooding, natural gas flooding, associated gas flooding, and N2 flooding. The swept area of associated gas flooding and N2 flooding is larger than natural gas, but their oil components extraction effects are too low. Therefore, the enhanced cumulative oil production of natural gas flooding is the highest. Finally, gas components optimization is conducted using particle swarm optimization, genetic algorithm, simulated annealing algorithm, and surrogate optimization. Optimization results show that gas composed of about 20 mol.% CO2 and 80 mol.% associated gas can coordinate oil components extraction and swept area best. The cumulative oil production of optimized gas flooding is about 6.4%, 2.0%, and 0.3% higher than associated gas flooding, CO2 flooding, and natural gas flooding, respectively. The study provides valuable guidance for enhancing cumulative oil production, sequestrating CO2, and recycling associated gas.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Inhibiting Greenhouse Effect and Improving Oil Recovery by Alternately Injecting CO2 and Associated Gas

  • 会议论文

  • 发表日期：

    2025年

查看全文
  • Yifan Ma,
  • Zongfa Li,
  • Hui Zhao,
  • Lijuan Huang,
  • Zifeng Chen,
  • Yiyang Yin,
  • Haotian Zheng

摘要

The feasibility of CO2-assisted associated gas in enhancing oil recovery is discussed. Firstly, numerical simulations of gas flooding at field scale are conducted. Analysis show that enhanced cumulative oil production of gas flooding is determined by oil components extraction effect and gas flooding swept area. The oil components extraction effect of CO2 is better than natural gas, but CO2 flooding swept area is the smallest among CO2 flooding, natural gas flooding, associated gas flooding, and N2 flooding. The swept area of associated gas flooding and N2 flooding is larger than natural gas, but their oil components extraction effects are too low. Therefore, the enhanced cumulative oil production of natural gas flooding is the highest. Finally, gas components optimization is conducted using particle swarm optimization, genetic algorithm, simulated annealing algorithm, and surrogate optimization. Optimization results show that gas composed of about 20 mol.% CO2 and 80 mol.% associated gas can coordinate oil components extraction and swept area best. The cumulative oil production of optimized gas flooding is about 6.4%, 2.0%, and 0.3% higher than associated gas flooding, CO2 flooding, and natural gas flooding, respectively. The study provides valuable guidance for enhancing cumulative oil production, sequestrating CO2, and recycling associated gas.