CAJ | 학술논문

地热井的保温增效及节约成本问题成为了制约我国地热产业规模扩大化、产业升级化、能源结构优化的瓶颈之一。为此，结合地热井井身结构特点，建立井筒温度计算模型，通过现场测试数据对模型进行验证，井口产液温度误差仅为1℃。针对地热井热损失严重的井段，提出新的完井管柱结构，建立与之对应的案例；并应用所建温度模型和传热系数计算方法对所建案例进行计算。计算结果表明：改变完井管柱和环空介质能显著降低井筒热损失，仅改变完井管柱就能将井口产液温度提高6．1℃，使用隔热材料的泵管更能将井口产液温度提高10．1℃，最终从施工成本和材料成本考虑，优选了最经济有效的完井管柱。研究成果对地热井保温增效开发具有指导意义。
지열정적보온증효급절약성본문제성위료제약아국지열산업규모확대화、산업승급화、능원결구우화적병경지일。위차，결합지열정정신결구특점，건립정통온도계산모형，통과현장측시수거대모형진행험증，정구산액온도오차부위1℃。침대지열정열손실엄중적정단，제출신적완정관주결구，건립여지대응적안례；병응용소건온도모형화전열계수계산방법대소건안례진행계산。계산결과표명：개변완정관주화배공개질능현저강저정통열손실，부개변완정관주취능장정구산액온도제고6．1℃，사용격열재료적빙관경능장정구산액온도제고10．1℃，최종종시공성본화재료성본고필，우선료최경제유효적완정관주。연구성과대지열정보온증효개발구유지도의의。
For geothermal wells in China, heat preservation and cost saving are critical to amplify industry scale, upgrade industrial structure, and optimize energy structure.Therefore, a wellbore temperature calculation model was established considering the characteristics of geothermal well bore configuration.The model was valida-ted through the test data of a case well,and the deviation of wellhead fluid temperature was only 1℃compared with the real data and simulated date.For sections with severe heat loss in geothermal well, a new completion string structure was proposed based on heat transfer coefficient models and temperature calculation methods.Field appli-cations show that wellbore heat loss was reduced significantly by changing the completion string and annulus media, for example, the temperature of wellhead fluid production raised 6.1℃by changing completion string and 10.1℃by using the insulation tubing.Completion string was optimized considering construction and material cost.The re-sults are meaningful for the development of geothermal wells.