Isikrweqe seCasing

Esi sixhobo sifanelekile ekususeni ukungcola okunokushiyeka phezu kweendonga zangaphakathi zekhabhathi, ezifana nesamente eqinileyo, iwax eqinileyo, iikristale zetyuwa ezahlukeneyo okanye iidiphozithi, ii-perforation burrs, iintsalela ze-iron oxide ezibangelwa kukugqwala, ukuze zonke izixhobo zemingxuma engaphantsi zidlule zingavalwanga. Ingakumbi xa kukho indawo encinci ejikelezayo phakathi kwezixhobo zemingxuma engaphantsi kunye nekhabhathi ngaphakathi kobubanzi, ukukrwela okupheleleyo kuba yimfuneko ngaphambi kokuba kusetyenzwe ngakumbi. Okwangoku, ukukrwela umngxuma omkhulu wepetroliyam eludongeni lwangaphakathi lwekhabhathi ngokusebenzisa i-casing scraper linyathelo eliyimfuneko.