CO2驱油和埋存能有效减少温室气体排放量达到碳中和目标,已有的CO2埋存量计算方法主要针对CO2的静态埋存量进行粗略计算,未考虑实际生产过程中CO2埋存量的变化。针对上述问题,运用CO2溶解、CO2波及体积和驱油机理,将CO2驱油与埋存过程分为气相区、两相或近混相区、扩散区和油相区,并基于“四区法”计算CO2埋存量,得到了不同烃类的注入孔隙体积倍数、注入压力、注气速度下的CO2动态埋存量的变化规律。将研究成果应用于W油田低渗储层,结果表明:注入烃类孔隙体积倍数、压力、注气速度与总埋存量呈正相关性,当压力由12 MPa升至30 MPa,CO2埋存总量增加15.53×104 t;当注气速度由5 t/d增加至30 t/d,峰值CO2埋存总量由3.51×104 t提高至12.62×104 t。研究成果可为同类油藏开展CO2驱油与埋存项目提供新的思路。
CO2 flooding and storage have the potential to significantly mitigate greenhouse gas emissions and contribute to achieving carbon neutrality objectives. Nevertheless, current methods for calculating CO2 storage capacity primarily concentrate on rough estimates of static CO2 storage, neglecting variations in CO2 storage during actual production processes. In view of the above problems, the process of CO2 flooding and storage is divided into gas phase zone, two-phase or near-miscible phase zone, diffusion zone and oil phase zone by using CO2 dissolution, CO2 swept volume and oil displacement mechanism. Based on the four-zone method, the CO2 storage capacity is calculated, and the dynamic CO2 storage capacity under varying hydrocarbon pore volume multiples, injection pressure and gas injection rate is obtained. The research results are applied to the low permeability reservoir of W oilfield. The results show that the pore volume multiple, pressure and gas injection rate of injected hydrocarbons are positively correlated with the total storage capacity. When the pressure increases from 12 MPa to 30 MPa, the total amount of CO2 storage increases by 15.53×104 t; when the gas injection rate increases from 5 t/d to 30 t/d, the total amount of peak CO2 storage increases from 3.51×104 t to 12.62×104t. The research results can provide new ideas for the development of CO2 flooding and storage projects in similar reservoirs.
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