NQ HQ Core Barrel, Casing Tube, Overshot Assembly,Hosting Plug, Drill RodNQ HQ Core Barrel, Casing Tube, Overshot Assembly,Hosti NQ HQ Core Barrel, Casing Tube, Overshot Assembly,Hosting Plug, Drill RodNQ HQ Core Barrel, Casing Tube, Overshot Assembly,Hosting Plug, Drill Rod Wireline drilling is the special method of removing the core. When the driller wants to remove core from a conventional ...