Statistics and analysis of economic and technical indexes for 3000m scientific drilling in Jiama，Tibet

Abstract:

Well JMKZ-1 in Jiama is the first 3000m scientific drilling project for solid mineral survey in Tibet Plateau.The project was lasted 488 d from June 2019 to October 2020. The total depth is 3003.33m with the final hole diameter of 98mm and a core recovery rate of 99.38%， which made a record in the field of small-bore solid mineral exploration on the Qinghai-Tibet Plateau at an altitude of 5200m. In this paper， detailed technical statistics of the drilling time， drilling efficiency， round footage and other indexes are made， the main factors which affect the ultra-deep geological drilling efficiency on the plateau are analyzed including the environment， the formation， drilling techniques， equipment， management actions and so on. Meanwhile， the measures to improve the efficiency of deep drilling are summarized such as drilling design， equipment configuration， drilling method selection， hole accident prevention， new technology and new method application， construction organization， etc. The project experience has obtained good results through popularization and application， which can provide some technical reference for improving the efficiency of ultra-deep hole drilling in the future.