Abstract: In recent years,geothermal resources have attracted wide attention from all walks of life.Especially in the development and utilization of middle and deep water thermal resources,compared with conventional geothermal well construction,the middledeep geothermal wells are characterized by larger depth,more complex construction process,high requirements for well completion and great difficulty for constrution.Therefore,it is very important to study the construction process of middledeep geothermal wells.On the basis of consulting a large number of materials,collecting and analyzing the achievements of predecessors and combining with years of work experience,detailed analysis from the construction process of geothermal wells,division of subprojects,and requirements of key technical indicators for well completion is done.Finally,the key quality control points during the construction of middledeep geothermal wells are proposed.It provides reference for the construction of middledeep geothermal wells.

Key words: Geothermal well,Drilling technology,Well drilling technology,Quality control