UPPER CONNECTION 



INNER BARREL 

 VENT CHECK 

 VALVE 



BEARING 

 y SUB 



_ INNER BARREL 

 T~ RUBBER THRUST 

 I BEARING 



OILITE GUIDE 



BEARING 



INNER BARREL 

 SUPPORT 



|— OUTER BARREL 



INNER 

 BARREL 



CORE 

 CATCHER 



DIAMOND CORE BIT 



HARD FORMATION 

 CORE BIT 



Figure 33-2. Frangible formation core 

 barrel. 



SOFT FORMATION 

 CORE BIT 



Figure 33-3. Types of coring bits 

 (Courtesy Reed Roller Bit Com- 

 pany) . 



