西藏甲玛3000 m科学深钻经济技术指标统计与分析

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

西藏甲玛3000 m科学深钻JMKZ-1孔是青藏高原固体矿产调查领域首个3000 m科学钻探项目,项目于2019年7月开钻,2020年10月终孔,历时488 d,终孔孔深3003.33 m,终孔口径98 mm,岩心采取率99.38%,在5200 m海拔创造了青藏高原小口径固矿勘查领域孔深纪录。通过对其钻进时间、钻探效率、回次进尺长度等指标进行详细的技术指标统计,分析了影响高原特深地质钻孔钻进效率的主要因素包括环境、地层、钻进工艺、设备、管理措施等。总结了提高特深孔钻探效率的措施,包括钻孔设计、钻探设备配置、钻进工艺方法选择、孔内事故预防、新技术新方法应用、施工组织管理等。项目经验通过推广应用,取得了良好的效果,可以为提高特深孔钻探施工效率提供技术参考。

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, newtechnology and new method application, construction organization, etc. The project experience has obtained goodresults through popularization and application, which can provide some technical reference for improving the efficiencyof ultra⁃deep hole drilling in the future.