抽采井对咸水层CCS技术潜在影响的初步探讨

A Preliminary Study of the Potential Impacts of Extraction Well on Saline Aquifer CCS Technology

咸水层CCS技术作为重要碳减排措施,可在短时间内显著减少大气中CO2的含量。CO2注入储层后,孔隙压力、CO2分布特征和储层碳封存量大小是安全有效开展该技术的决定因素。针对鄂尔多斯盆地咸水层CCS技术示范项目的地质条件,采用数值模拟的方法对比了该技术在布置抽采井与不布置抽采井下储层孔隙压力、CO2分布、注入井中CO2注入速率以及储层碳累积封存量上的差异。结果显示,布置抽采井相比于不布置抽采井可在显著提高储层碳累积封存量的同时缓解因CO2注入而导致储层压力的持续增加。

The saline aquifer CCS（CO2 Capture and Storage）technology is considered to be an important measures for reducing greenhouse gas emissions. The distribution of pore fluid pressure, CO2 gas phase saturation and the cumulative amount of CO2 sequestration in the reservoir is the determining factor to ef- fectively and safely carry out this technology. This paper analyses the pore fluid pressure, CO2gas phase saturation, CO2 injection rate and the cumulative amount of CO2 sequestration for the saline aquifer CCS Technology with extraction well and without extraction well based on the CCS demonstration project in Er- dos, respectively. Numerical simulation results show that the extraction well can significantly increase the cumulative amount of CO2 sequestration in the reservoir with simultaneous easing the pore fluid pressure continues increasing caused by CO2 injection.