CO_(2)捕集、利用与封存(CCUS)技术示范区气体示踪监测技术研究与应用

Research and application of gas tracer monitoring technology in CO_(2)capture,utilization and storage(CCUS)technology demonstration blocks

CO_(2)捕集、利用与封存技术(CCUS)能够大规模减少温室气体排放,国内CO_(2)驱油封存主要应用于低渗透油藏,其混相压力高(超过30 MPa),注采井间压力落差大。通过数值模拟方法可以描述CO_(2)井间分布,但是不能定量、及时描述CO_(2)分布规律,驱替前缘描述难度大,同时CO_(2)气窜现象较为突出,制约油藏高效开发。开展井间CO_(2)气体示踪监测技术研究,通过CO_(2)气体示踪剂评价优选,完善注入工艺,对监测数据分析,达到对注采井间气体的有效监控,明确注采井间CO_(2)分布规律,同时准确预判气窜方向,防范风险和环境污染,为CCUS注采调控和气窜治理提供有力支撑。

CO_(2)capture,utilization,and storage(CCUS)technology can reduce greenhouse gas emissions on a large scale.CO_(2)flooding and storage in China are mainly used in low-permeability oil reservoirs,with high mixing pressure(over 30 MPa)and significant pressure drop between injection and production wells.The nu⁃merical simulation method can provide a schematic diagram of the distribution of CO_(2)between wells,but it cannot quantitatively and timely describe the distribution pattern of CO_(2),making it difficult to describe the dis⁃placement front.At the same time,the phenomenon of CO_(2)gas channeling is more prominent,which restricts the efficient development of oil reservoirs.Therefore,research on CO_(2)gas tracer monitoring technology be⁃tween wells was carried out,and through the evaluation and optimization of CO_(2)gas tracers,the injection pro⁃cess was improved.Monitoring data analysis was used to assist decision-making,achieving effective monitoring of gas between injection and production wells,clarifying the distribution pattern of CO_(2)between injection and production wells,accurately predicting the direction of gas channeling,preventing risks and environmental pol⁃lution,and providing strong support for CCUS injection and production control and gas channeling control.