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Practice of Construction Technology for More than 2000m Oil and Gas Investigation Well in Tibet Nima Basin

GUO Ru-lun;WANG Zhi-xiang;No.6 Geological Brigade of Bureau of Geology and Mineral Exploration and Development of Tibet Autonomous Region;No.403 Geological Brigade of Bureau of Geology and Mineral Exploration and Development of Sichuan Province;  
Being the deepest small diameter geological core well in Tibet area,Ni-1 is an oil and gas investigation well with the final depth of 2001. 1 m. The discussion is made on the construction equipments selection,borehole structure design,coring technology,flushing fluid wall protection and treatment scheme for drilling in complex formations,the drilling construction experiences in high altitude area are summed up with the analysis on the existing shortcomings,which can provide some experience for future drilling construction in this area of Tibet.
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