超临界CO_2在干热岩中的采热能力及系统能量利用效率的研究  

Heat mining capacity and energy utilization efficiency of SCCO_2-HDR geothermal system

作　　者：张亮[1] 裴晶晶 任韶然[1] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油新疆油田红山公司,新疆克拉玛依834000

出　　处：《可再生能源》2014年第1期114-119,共6页Renewable Energy Resources

基　　金：中央高校基本科研业务费专项资金资助项目(27R1202007A);山东省自然科学青年基金项目(ZR2013EEQ032);青岛市科技计划项目产学研合作引导计划(13-1-4-254-jch)

摘　　要：从注采系统角度考虑井筒流动与储层渗流的耦合,采用油藏数值模拟手段,分析了超临界CO2在干热岩中的采热能力及系统能量利用效率,评价了CO2-EGS发电的经济性。研究结果表明,超临界CO2优于H2O的采热能力主要得益于其自身的渗流能力,地层水的存在及井筒流动会在一定程度上降低超临界CO2的地面采热速率;CO2-EGS系统的热电转化效率以及地面发电功率较高,但经济性有限;随着钻井、压裂技术的发展以及经济政策的完善,CO2-EGS系统的发电成本有望大大降低。From a point of complete-system view, considering coupling of COz flowing in reservoir and wellbore, the reservoir simulation method is applied to analyze heat mining capacity of SCCO2 and energy utilization efficiency in CO2-EGS geothermal system. Economic efficiency of CO2-EGS power generation is also assessed. The study results show that the greater heat mining capacity of SCCO2 than H2O is mainly due to its strong mobility in formations. But to some extent, the existing formation water and CO2 flowing in wellbores will restrict the heat mining rate of SCCO2 at surface. Although the thermoelectric transfer efficiency of CO2-EGS system is higher, and much more output power can be obtained at ground, however the economic feasibility of CO2-EGS for power generation is still limited under current technical level. But as the well drilling and reservoir stimulation technologies are developed and the economic policies such as carbon taxes and subsidies are established, the cost of power generation by CO2-EGS system will be reduced greatly.

关 键 词：超临界CO2 干热岩 采热能力 地热发电 经济分析 

分 类 号：TK529[动力工程及工程热物理—热能工程]