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


        
      
    
      
    
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   Valves undergo regular maintenance checks. 
  JIN TIAN/FOR CHINA DAILY 
 
     

     

    Due to the complicated geological conditions and challenges, such as high temperatures, pressure and sulfur content, it took the team from CNPC Chuanqing Drilling Engineering more than one and a half years to finish exploration work at the site.
     

        
    

        
        
      
    
        
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