摘要
利用枯竭油气藏储存热能并封存CO_(2),既可解决太阳能跨季节储热难题,又可扩大可再生能源供暖占比,同时还可提高CO_(2)地质封存的经济性。提出了枯竭油气藏储热供暖耦合CO_(2)封存的新方案,以CO_(2)作为循环工质,夏季吸收太阳热量储存于油气藏背斜构造中,而冬季取出供暖,建立了储释能过程的数学模型,重点分析了枯竭油气藏储能系统热工性能和CO_(2)封存性能。结果表明:(1)新方案储能系统热工性能优异。单井平均采热功率4808.95 kW,每个采暖季可有效利用的平均储热量49859.21 GJ,平均能量储存密度28984.23 kJ/m^(3)。(2)CO_(2)密度对温度敏感的特性降低了热损失,提高了系统效率。枯竭油气藏储能系统平均能量回收效率95.84%,平均热回收效率83.66%。(3)储能加速了CO_(2)溶解。储释能过程中周期性的注入和采出工作气导致气液界面反复膨胀收缩,增加了气水接触面积,提高了传质动力,加速了CO_(2)在水中的溶解。对比储能模式和仅CO_(2)封存模式,CO_(2)溶解比例增量由0.26%上升至2.22%。枯竭油气藏储热供暖耦合CO_(2)封存新方案既有优异的热工性能,又加速了CO_(2)的地质封存,是一种高值化的枯竭油气藏利用和可再生能源供暖方案,具有大规模推广应用的潜力。
[Objective]Thermal energy storage and CO_(2) sequestration in depleted oil and gas reservoirs can not only solve the problem of seasonal solar thermal energy storage but also increase the share of renewable energy space heating and enhance the economy of CO_(2) geological sequestration.[Methods]A novel scheme of thermal energy storage for space heating and CO_(2) sequestration in depleted oil and gas reservoirs is proposed by storing solar thermal energy in depleted oil and gas reservoirs in summer and extracting thermal energy for space heating in winter using CO_(2) as the working medium.A mathematical model of the energy storage and release process is established,and the thermal performance and CO_(2) sequestration performance of energy storage system in depleted oil and gas reservoirs are analysed.[Results]The results show that(1)the novel scheme has excellent thermal performance,with a single-well thermal extraction power of 4808.95 kW,a thermal energy storage capacity of 49859.21 GJ per heating season and an energy storage density of 28984.23 kJ/m^(3).(2)The novel scheme has an energy recovery efficiency of 95.84%and a thermal recovery efficiency of 83.66%due to the strong sensitivity of the CO_(2) density to temperature.(3)The solubility trapping of CO_(2) in formation water is accelerated by the energy storage process.The periodic injection and extraction of CO_(2) during the process of energy storage and release causes the repeated expansion and contraction of the gas-water interface,which increases the gas-water contact area and improves the driving force of mass transfer,thus leading to an increase in CO_(2) dissolution in the formation water.Compared with the CO_(2) sequestration model alone,the mass ratio of CO_(2) dissolution in formation water for the energy storage model increases from 0.26% to 2.22%.[Conclusion]Overall,the novel scheme has excellent thermal performance.It accelerates CO_(2) geological sequestration and is a high-value scheme for depleted reservoir utilization and renewable energy
作者
王延欣
WANG Yanxin(SINOPEC Star Petroleum Co.,Ltd.,Beijing 100083,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2024年第3期12-21,共10页
Bulletin of Geological Science and Technology
基金
中国石油化工集团有限公司项目“新能源与石化减碳的融合发展研究”(JR22012)。
关键词
枯竭油气藏
太阳能跨季节储热
可再生能源供暖
CO_(2)封存
地热太阳能联合供暖
储热供暖
depleted oil and gas reservoir
seasonal solar thermal energy storage
renewable energy space heating
CO_(2)sequestration
conjugated heating system of geothermal and solar energy
thermal energy storage for space heating
