针对地热井的保温增效问题,根据地热井井身结构特点,建立井筒温度计算模型,并利用A 地热井现场测试数据对模型进行验证,应用该模型对地热井热损失影响因素进行了敏感性分析。结果表明,通过有效洗井等措施,将局部井段产水转化为全井段产水,可使井口产液温度由61.2℃增加至65.7℃;井口产液温度随着日产量的增加而增高,但增幅逐渐减少;改变井身结构能显著提高井口产液温度,但需要进行系统的井身结构优化;采用保温材料的泵管带泵下深400 m 时,井口产液温度达到70.9℃,比常规泵管提高2.7℃。分析结果为地热井保温增效开发提供了理论依据。
The heat preservation and its cost have become the bottleneck of the geothermal resource development. With this in view, a wellbore temperature calculation model is established based on the characteristics of the well bore configuration of the geothermal well. The model is validated through the test data of the geothermal well A,and it is used for sensitivity analysis of the heat loss factors of the geothermal wells. The results show that a geothermal well is changed from a part segment production to the full segment production through well washing and other effective measures, by which the well head temperature is increased from 61.2℃ to 65.7℃. The wellhead liquid temperature can be increased by increasing the fluid production rate, however, the increasing trend slows down as the rate increases. Also the wellhead liquid temperature is significantly affected by the well bore configuration that needs a systematic optimization. At last a 400 meter heat preservation tubing can increase the wellhead liquid temperature by 2.7℃. Based on the analysis results, the corresponding heat preservation suggestions are proposed, for the development of geothermal wells.
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