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| Study on technique and method of geothermal drilling under the complex geological conditions in Shangri-la region |
| Lin Ruihua |
| The Second Hydrogeologic Team， China National Administration of Coal Geology， Xingtai 054000， China |
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Abstract Fault power structure was encountered in the drilling construction process in upper section of geothermal well in Shangri-la economic development region. In several sections of the well， complex geological circumstances were encountered including block falling hole collapse and a large amount of sand and water inflow， and soft rock stratum with large dip angle was encountered in lower section of well，which brought great difficulty to the drilling construction. Based on complex geological conditions encountered by this geothermal well， the study was implemented on technique and method of geothermal drilling under the complex geological conditions in Shangri-la region in order to complete construction successfully and solve problems of similar projects. By acquaintance and analysis of geological conditions in construction area，combined with strata practically revealed by drilling， various drilling techniques and methods were adopted， comparisons of each effect were made to summarize construction experience， and the study was completed on technique and method of geothermal drilling under the complex geological conditions in Shangri-la region. The study provided reference for geothermal drilling under the similarly complex geological conditions.
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