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    Products & services
    
                            
    
                        
    
                    
    
            
    
            
    
        
    
    
    


    
    
    
        
            
    
                
    

    Drill Collar
    


    

    

    Product Introduction 
    

    


    

    The drill collar is a thick-walled drilling tool that applies bit pressure, to enhance drilling.
    

    

    

    

            
    





            
    
                
    

    Product Specification
    


    

    (a)Size (OD): 3-1/8" to 11".
    
(b)Type: Slick drill collar, spiral drill collar, non-magnetic drill collar.
    
(c)Drill collar specification: API Spec 7-1, API Spec 7-2, API RP 7G, NS-1, DS-1. 
    
(d)Other proprietary products of Hilong that applicable to deep well and harsh environment drilling.
    
(e)Please refer to Table A.4 or Table B.4 for the specifications of commonly used API drill collars.