I-IBOP, i-internal blowout preventer ye-top drive, ibizwa nangokuthi i-top drive cock. Emgodini kawoyela negesi, ukubhoboza kuyingozi abantu abangafuni ukuyibona kunoma iyiphi indawo yokumba. Ngoba kubeka engcupheni ukuphepha komuntu siqu kanye nempahla yezisebenzi zokumba futhi kuletha ukungcoliswa kwemvelo. Ngokuvamile, uketshezi olunomfutho ophezulu (uketshezi noma igesi), ikakhulukazi igesi enodaka namatshe, luzokhishwa esihlokweni somthombo ngesilinganiso sokugeleza esiphezulu kakhulu, senze indawo enyantisayo yokubhonga kweziqhumane. Imbangela yengozi ivela oketshezini oluphakathi kwezingqimba zamatshe angaphansi komhlaba,