基于油藏CO_2驱油潜力的CCUS源汇匹配方法

CCUS SOURCE-SINK MATCHING METHOD BASED ON THE POTENTIAL OF CO_2 FLOODING

CO_2捕集、利用与埋存(CCUS)商业化的关键因素是通过工业CO_2排放源与油田间的源汇匹配,筛选出最具经济性的匹配方案。基于油藏驱油潜力和油田CO_2驱注气的阶段开发特点,以油田可承受CO_2极限成本为约束条件,CCUS商业化项目的总成本现值最小为优化目标,建立了工业CO_2排放源与具有效益开发潜力油藏的CCUS源汇匹配评价流程和相关指标计算方法。并以我国东部地区某油田及附近碳源为例,筛选出可承受CO_2极限成本大于150元/t的油田区块,将CCUS全生命周期划分为6个阶段,完成燃煤电厂(碳源地)与油田区块间管道布局和CO_2注入井的接替(分阶段)注采规划,并发现当油价高于70美元/桶时,油田区块的平均可承受CO_2极限成本接近该源汇匹配下的全生命周期CO_2平均供给成本。

The key factor for CO2 capture, utilization and storage(CCUS) commercialization is to screen the most economical matching scheme through source-sink matching between industrial emission source and oil field. In this paper, based on the flooding potential of oil reservoirs and stage development characteristics of CO2 flooding and gas injection of oil fields, a CCUS source-sink matching evaluation process and calculation method of relevant indicators were developed under the constraint of the affordable CO2 limit cost of the targeted oil fields, and with the minimum total present cost value of the CCUS commercial project as the optimization target. In addition, this paper took a certain oil-field and its nearby carbon sources in the eastern region of China for instance, screened the oil blocks whose affordable CO2 limit cost was higher than RMB 150/t, and divided the whole lifecycle of CCUS into 6 stages, completed the distribution of pipelines between coal-fired power plants(carbon source) and oil blocks and the replacement(staged) injection-production planning for CO2 injection wells, and the results showed that when international crude oil price was above $70/barrel, the average affordable CO2 limit cost was close to the average CO2 supply cost during the whole lifecycle under this source-sink matching.