CCUS-EGR全产业链经济评价方法

Economic evaluation on the whole industrial chain of CCUS-EGR

碳捕集、利用与封存(CCUS)是全球公认的最具商业化应用潜力的碳减排技术,在助力中国如期实现“双碳”目标过程中将发挥重要作用。碳捕集、利用与封存-提高天然气采收率(CCUS-EGR)是油气田企业同步推动老气田提高采收率和实现碳达峰碳中和的可行性路径,对于油气田增储上产和碳达峰具有重要意义。构建CCUSEGR全产业链经济评价方法,是CCUS-EGR项目示范及未来产业化发展的基础。为此,基于CCUS-EGR全产业链流程,构建了包含捕集压缩模块、运输模块、注入封存模块、分离回注模块、风险监测模块等CCUS-EGR全产业链经济评价模型,并以重庆合川某电厂-WLH气田的全产业链项目为案例进行验证。研究结果表明:(1)天然气价格、生产工况、碳交易价格、运行成本对于全产业链效益具有显著影响,其中生产工况(换气比)和碳交易价格敏感性最高,其次是运行成本与天然气价格;(2) CCUS-EGR增产带来的资源收益可显著增加全产业链的总效益;(3)碳排放权交易价格对全产业链效益至为重要,将CCUS-EGR净碳减排量投入碳交易市场可有效促进项目收益率提升。最后,为了提高CCUS-EGR项目全产业链经济效益,提出了继续深化CO_(2)有效埋存的技术研究、加快CCUS-EGR方法学的研究与建立、出台CCUS-EGR量化核证标准和产业支持政策等建议。

Being a globally recognized technology to reduce carbon emission with the greatest commercial potential,carbon capture,utilization and storage(CCUS)plays an important role in helping the achievement of China's dual-carbon goal on schedule.Moreover,CCUS-enhanced gas recovery(CCUS-EGR),as a feasible path for petroleum enterprises to enhance gas recovery in old gasfields,can achieve carbon peaking and carbon neutrality simultaneously.It is of great significance to reserve and production increment as well as carbon peaking.To set up an economic evaluation method for the whole industrial chain of CCUS-EGR is the foundation for the demonstration and future industrial development of CCUS-EGR projects.So,based on this whole chain process,one economic evaluation model has been developed for this chain which is composed of five modules,such as capture&compression,transportation,injection&storage,separation&reinjection,and risk monitoring.In addition,the model was verified through one whole industrial chain project on Chongqing Hechuan Power Plant and WLH Gasfield.Results show that(i)natural-gas price,production condition,carbon-trading price and operation cost have great influences on the revenue of the whole industrial chain.Among them,production condition and carbon-trading price are the most sensitive,followed by operation cost and natural-gas price;(ii)resource earnings contributed by CCUS-EGR can substantially increase the total chain revenue;(iii)the carbon-emission right trading price is crucial to the chain revenue,and introducing the net emission reduction of CCUS-EGR into carbon-trading markets can effectively raise the return rate.Three suggestions are made in an effort to increase the whole industrial chain economic benefits of CCUS-EGR projects,including to further discuss the effective CO_(2) storage,to accelerate the research and development of CCUS-EGR,and to deliver standards and policies to quantitatively certify CCUS-EGR and support this industry.