低渗透油藏CO2驱提高采收率技术进展及展望

Technical advancement and prospect for CO2 flooding enhanced oil recovery in low permeability reservoirs

CO2驱技术可以提高低渗透油藏采收率和实现CO2地质封存,在中国具有广阔的应用前景。针对中国陆相低渗透油藏复杂的地质和开发特征,系统阐述了中国石化CO2驱油理论、油藏工程优化设计、注采工程及防腐工艺、产出CO2回收利用等技术进展及矿场试验情况。分析了低渗透油藏CO2驱技术面临的挑战和技术需求,从低成本CO2捕集、输送、降低混相压力,改善CO2驱开发效果、埋存优化及监测技术和超临界CO2压裂技术等方面提出了加快CO2驱技术发展的建议。对于推动CO2驱油和埋存技术发展,提高低渗透油藏储量动用率和采收率、保障国家能源供应和低碳减排具有重要意义。

The CO2 flooding technology is an important technology to enhance oil recovery in low permeability reservoirs and to realize the geological sequestration of CO2 so that it has the wide application prospects in China. In view of the complex geology and development characteristics of the continental low permeability reservoirs in China,the CO2 displacement theory,optimal design of reservoir engineering,injection-production engineering and anticorrosion technology,CO2 recovery and utilization technology and the progress of the field test etc.of SINOPEC are systematically presented. The challenges and technical requirements of the CO2 flooding technology in the low permeability reservoirs are analyzed,and the suggestions on accelerating the development of CO2 flooding technology are put forward from the aspects of the low-cost capture,transportation of CO2,reduction of the miscibility pressure,improvement of the CO2 flooding effect,CO2 storage and monitoring technology,and supercritical CO2 fracturing. It is of the great significance to promote the CO2 flooding and storage technology,improve the reserve producing rate and oil recovery,guarantee the national energy supply and reduce the CO2 emission.