Research On Drilling and Construction Technology of Geothermal Exploration Well D03 In Xiong’An New Area, China

To obtain the geological structure and distribution of the JiXian System carbonate rock thermal reservoir and calculate the geothermal resource potential more accurately, the drilling and construction technology of the D03 geothermal exploration well was studied. This paper introduces the drilling and construction of the D03 geothermal exploration well. The designed well depth is 2500 m, the drilling depth is 2511.10 m, and the drilling diameter is φ152.4 mm. In the process of drilling in the fourth well section, to better distinguish the dolomite from the Wumishan Formation and the Gaoyuzhuang Formation, the core drilling in the fixed well section was carried out. And the core-taking rate of the surface set core bit, the impregnated bottom jet coring bit, and the impregnated core coring bit was compared, and it was found that the impregnated bottom jet coring bit had the highest core-taking rate, reaching 75%. In the fourth well section, three drilling methods were compared during full drilling: In practice, it was proved that the drilling rate and return length of the cone bit which was driven by the screw motor were higher than those of the cone bit driven by the rotary table, increased by 64.0% and 31.4% respectively. Through the drilling construction, coring, and drilling technology of the D03 geothermal exploration well, the main lithologic characteristics of the D03 well area have been found, which provides a certain reference value for subsequent geothermal resource evaluation.