JCDRILL manufacture differenct types of the core barrels with high quality.Size Available: B76 core barrel, B86 core barrle, B101 core barrel, B131 core barrel, B146 core barrel BQ core barrel NQ core barrel, HQ core barrel PQ core barrrel, NQ3 core barrel, HQ3 core barrel, PQ3 core barrel TT-46 core barrel TT56 core barrel T2-56 core barrel, T2-66 core barrel, T2-76 core barrel, T2-86 core barrel, T2-101 core barrel T6-76 core barrel T6-86 core barrel T6-101 core barrel T6-116 core barrel T6-131 core barrel T6-131 core barrel NMLC core barrel, HMLC core barrel HWF core barrel, PWF core barrel NWG core barrel, HWG core barrel LTK48 core barrel M101 core barrel 412 F core barrel Chinese Standard: Wireline 56, wireline 59, wireline 75, wireline 91... Wireline drilling is the special method of removing the core. When the driller wants to remove core from a conventional core drill, the entire core barrel has to be removed from the hole. This is time-consuming, as each rod has to be removed one at a time. With wireline drilling, a barrel of core can be removed from the bottom of the hole without removing the rod string. When the driller wants to remove the core, an overshot is lowered on the end of a wireline. The overshot attaches to the back of the core barrel inner tube and the wireline is pulled back and the inner tube disengages itself from the barrel. Welcome to contact us for more information.