海上高温气藏CO_(2)羽流地热系统注采参数影响规律

Influence of Injection and Production Parameters of CO_(2) PlumeGeothermal System in Offshore Gas Fields

CO_(2)羽流地热系统(CO_(2) plume geothermal system,CPGS)在减少碳排放、推动地热开发方面发挥重要作用。目前的研究主要集中在高温咸水层或废弃高温油藏,针对海上高温枯竭气藏储层的井筒-储层耦合研究较少。以莺歌海盆地黄流组高温气藏为研究对象,利用COMSOL软件构建了理想的井筒-储层耦合CPGS模型,分析了CPGS运行过程中热能传输规律,并对注采参数进行了敏感性研究。模拟结果表明:过大的注采流量会导致温度下降加快,建议在不同阶段调整注入流量。缩短注采井距会加快热突破,适当增加井间距可以延长系统寿命。注入温度对采热影响较小,提高注入温度可增加出口温度但减少取热功率,在开发中需要平衡这两个因素。

CO_(2) plume geothermal system(CPGS)plays a significant role in reducing carbon emissions and promoting geothermal development.Current research mainly focuses on high-temperature saline aquifers or abandoned high-temperature oil reservoirs,with limited studies on the wellbore-reservoir coupling of depleted high-temperature gas reservoirs.The high-temperature gas reservoirs of the Yellow River Formation in the Yingge Basin were chosen as the research subject.The COMSOL software was utilized to establish an ideal well-reservoir coupled CPGS model.The heat exchange characteristics during the operation of CPGS were analyzed,and a sensitivity study was conducted on the injection and production parameters.The simulation results indicate that excessive injection and production rates can accelerate temperature decline.It is recommended to adjust injection rates at different stages to mitigate this effect.Shortening the well spacing can expedite thermal breakthrough,while appropriately increasing well spacing can extend the system's lifespan.The injection temperature has a relatively minor impact on heat extraction.Increasing the injection temperature can raise the outlet temperature but decreases the heat extraction rate.Balancing these two factors is necessary during development.