CO_2混相驱的可行性评价

Feasibility Assessment of the CO_2 Miscible Flooding Process

CO2驱是提高原油采收率和实现温室气体埋存的双赢举措,在中国具有广泛的应用前景。开展CO2混相驱可行性评价是CO2驱矿场实施的重要基础。基于文献和矿场经验,分析了CO2混相驱的不利因素,指出了CO2混相驱过程中需要重点考虑的问题以及发展趋势。提出CO2混相驱可行性评价主要包括:油藏筛选、室内实验评价、油藏数值模拟、经济风险评价、先导试验等环节,并对各个环节进行了分析。同时认为,可行性评价还需要考虑CO2注入过程中对储层、扰流或气窜、腐蚀、钙质与沥青质沉积等的影响,指出CO2混相驱成功的重点是保证油藏中较高的混相程度和CO2波及效率,在油藏方案和工程方案基础上,通过经济效益论证才能保障CO2混相驱的可行性。

CO2 flooding is a win-win measure for enhanced oil recovery and burial of greenhouse gases,which has a widely applied prospect in China. CO2 miscible flooding feasibility evaluation is an important foundation for the implementation of the field-scale. On the basis of considerable field application experience and literatures,we analyzed the negative factors of CO2 miscible flooding and pointed out an important consideration problem of CO2 miscible flooding process,as well as the development trend,and proposed feasibility evaluation of CO2 miscible flooding including：reservoir screening,laboratory measurements,reservoir simulation,economic and risk analysis,pilot testing. We hold that the feasibility assessment also needs to consider the impact of reservoir CO2 injection on spoiler or gas channeling,corrosion,calcium and asphaltene deposition, and point out that the success of CO2 miscible flooding focus is to ensure a higher mixed level of the reservoir and CO2 sweep efficiency. Based on the reservoir and engineering programs,the feasibility of CO2 miscible flooding can be ensured by the economic demonstration.