Whenever you interrupt drilling operations, you must install a downhole safety device, such as a cement plug, bridge plug, or packer. You must install the device at an appropriate depth within a properly cemented casing string or liner.
    
    
        
        (a) 
         Among the events that may cause you to interrupt drilling operations are:
     
    
        
        (1) 
         Evacuation of the drilling crew;
     
    
        
        (2) 
         Inability to keep the drilling rig on location; or
     
    
        
        (3) 
         Repair to major drilling or well-control equipment.
     
    
        
        (b) 
         For floating drilling operations, the District Manager may approve the use of blind or blind-shear rams or pipe rams and an inside BOP if you don't have time to install a downhole safety device or if special circumstances occur.
     
    
        
            Code of Federal Regulations
        
        [68 FR 8423, Feb. 20, 2003]