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          Record breakers know the drill
          
        
          
      
          
      
          
        
          
          China Daily |
          Updated: 2023-02-25 10:37
          
          
          
          
        


        
      
          
      
          
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   Engineer Zhu Wanmu tests the density of mud, which is used to aid the drilling of boreholes. 
  JIN TIAN/FOR CHINA DAILY 
 
           

           

          "The depth is a record for the deepest vertical well in Asia, which provides a strong engineering and technical guarantee for ultra-deep oil and gas exploration in China," says Ma Yong, deputy director of engineering technology at PetroChina Southwest Oil and Gasfield.
           

          
        
          

        
        
      
          
        
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