单井地热供暖关键因素分析
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摘要
基于地热井内流体的流动换热方程以及岩石的能量方程,研究井直径、岩石导热系数、井深和地温梯度对采出水温度和采热功率的影响.结果表明:单井采出水温度、采热功率和岩石温度场均随时间衰减,第1、10、20个供暖季对应的平均采热功率分别为755.01、660.02、639.42 kW,上述数据可用于热泵选型.对于20 a的供暖期,当两井间距为200 m时不会产生热干扰;岩石导热热阻远大于井内对流热阻和井壁导热热阻,降低岩石的导热热阻是提高采热功率的最有效手段;增加井直径和岩石导热系数可以降低岩石导热热阻;岩石导热系数每增加0.5 W/(m·K),采热功率增加100 kW;增加地温梯度和井深可以增大岩石和流体之间的传热温差,提高采热功率;地温梯度每增加10 K/km,采热功率增加213.54 kW.
The effects of well diameter, rock thermal conductivity, well depth and geothermal gradient on produced water temperature and extraction heat power were studied based on the mathematical equations for flow heat transfer and rock energy in geothermal well. Results showed that the produced water temperature, extraction heat power and rock temperature field always reduced with time. The average extraction heat power was respectively 755.01, 660.02 and 639.42 kW for the first, tenth and twentieth heating seasons, and the above data can be used for the type selection of heat pump. The spacing of 200 m can avoid thermal disturbance among the wells with heating time of20 years. The rock thermal conduction resistance was far greater than the fluid convection heat resistance and the well wall thermal conduction resistance, so reducing rock thermal conduction resistance was the most effective method for increasing extraction heat power. The rock thermal conduction resistance can be reduced by increasing the well diameter and the rock thermal conductivity. The extraction heat power can increase 100 kW with the increase of rock thermal conductivity of 0.5 W/(m·K). The temperature difference between liquid and rock can be raised by increasing geothermal gradient and well depth, and thus leading to the increase in extraction heat power.The extraction heat power can increase 213.54 kW with the increase of geothermal gradient of 10 K/km.
The effects of well diameter, rock thermal conductivity, well depth and geothermal gradient on produced water temperature and extraction heat power were studied based on the mathematical equations for flow heat transfer and rock energy in geothermal well. Results showed that the produced water temperature, extraction heat power and rock temperature field always reduced with time. The average extraction heat power was respectively 755.01, 660.02 and 639.42 kW for the first, tenth and twentieth heating seasons, and the above data can be used for the type selection of heat pump. The spacing of 200 m can avoid thermal disturbance among the wells with heating time of20 years. The rock thermal conduction resistance was far greater than the fluid convection heat resistance and the well wall thermal conduction resistance, so reducing rock thermal conduction resistance was the most effective method for increasing extraction heat power. The rock thermal conduction resistance can be reduced by increasing the well diameter and the rock thermal conductivity. The extraction heat power can increase 100 kW with the increase of rock thermal conductivity of 0.5 W/(m·K). The temperature difference between liquid and rock can be raised by increasing geothermal gradient and well depth, and thus leading to the increase in extraction heat power.The extraction heat power can increase 213.54 kW with the increase of geothermal gradient of 10 K/km.
引文
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[3]CHENG W L,LI T T,NIAN Y L.An Analysis of insulation of abandoned oil wells reused for geothermal power generation[J].Energy Procedia,2014,61:607-610.
[4]CHENG W L,LI T T,NIAN Y L,et al.Evaluation of working fluids for geothermal power generation from abandoned oil wells[J].Applied Energy,2014,118:238-245.
[5]CHENG W L,LI T T,NIAN Y L,et al.Studies on geothermal power generation using abandoned oil wells[J].Energy,2013,59:248-254.
[6]CHENG W L,LIU J,NIAN Y L.Enhancing geothermal power generation from abandoned oil wells with thermal reservoirs[J].Energy,2016,109:537-545.
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[8]WIGHT N M,BENNETT N S.Geothermal energy from abandoned oil and gas wells using water in combination with a closed wellbore[J].Applied Thermal Engineering,2015,89:908-915.
[9]CUI G D,REN S R,ZHANG L,et al.Geothermal exploitation from hot dry rocks via recycling heat transmission fluid in a horizontal well[J].Energy,2017,128:366-377.
[10]DAVIS A P,MICHAELIDES E E.Geothermal power production from abandoned oil wells[J].Energy,2009,34:866-872.
[11]NOOROLLAHI Y,POURARSHAD M,JALILINASRABADY S,et al.Numerical simulation of power production from abandoned oil wells in Ahwaz oil field in southern Iran[J].Geothermics,2015,55:16-23.
[12]CAULK R A,TOMAC I.Reuse of abandoned oil and gas wells for geothermal energy production[J].Renewable Energy,2017,112:388-397.
[13]ALIMONTI C,SOLDO E.Study of geothermal power generation from a very deep oil well with a wellbore heat exchanger[J].Renewable Energy,2016,86:292-301.
[14]孔彦龙,陈超凡,邵亥冰,等.深井换热技术原理及其换热量评估[J].地球物理学报,2017,60(12):4741-4752.KONG Yan-long,CHEN Chao-fan,SHAO Hai-bing,et al.Principle and capacity quantification of deepborehole heat exchangers[J].Chinese Journal of Geophysics,2017,60(12):4741-4752.
[15]KUJAMA T,NOWAK W,STACHEL A A.Utilization of existing deep geological wells for acquisitions of geothermal energy[J].Energy,2006,31(5):650-664.
[16]韦雅珍,王凤清,任宝玉.华北油区地热排采技术研究[J].石油钻采工艺,2009,31(增1):93-95.WEI Ya-zhen,WANG Feng-qing,REN Bbao-yu.Drainage and production by using geothermal in Huabei oil region[J].Oil Drilling and Production Technology,2009,31(Suppl.1):93-95.
[17]刘俊,张旭,高君,等.地源热泵桩基埋管传热性能测试与数值模拟研究[J].太阳能学报,2009,30(6):727-731.LIU Jun,ZHANG Xu,GAO Jun,et al.Heat transfer performance text and numerical simulation of pilepipe ground source heat pump system[J].Acta Energiae Solaris Sinica,2009,30(6):727-731.
[18]李旻,刁乃仁,方肇洪.单井回灌地源热泵地下传热数值模型研究[J].太阳能学报,2007,28(12):1394-1401.LI Min,DIAO Nai-ren,FANG Zhao-hong.Study on numerical heat transfer models of standing column well[J].Acta Energiae Solaris Sinica,2007,28(12):1394-1401.
[19]卜宪标,谭羽非,李炳熙,等.盐穴地下储油库热质交换及蠕变[J].西安交通大学学报,2009,43(11):104-108.BU Xian-biao,TAN Yu-fei,LI Bing-xi,et al.Heat and mass transfer and creep in underground oil storage with cavern[J].Journal of Xi’an Jiao Tong University,2009,43(11):104-108.
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