OCTGisetshenziselwa kakhulu ukumba imithombo kawoyela negesi kanye nokuthuthwa kukawoyela negesi.Kuhlanganisa ipayipi lokubhola likawoyela, i-casing, ishubhu yokumpompa.Amapayipi okumba uwoyela asetshenziswa ngokuyinhloko ukuxhuma ikhola yokubhola kanye nebhithi futhi kudlule amandla okubhola.I-oil casing isetshenziselwa ngokuyinhloko ukumba nokuqedwa kodonga oluseceleni lokusekela ukuze kuqinisekiswe ukusebenza okujwayelekile kwemithombo ekuziphatheni nasekuqedeni inqubo yokumba.Imithombo yamashubhu okumpompa ngaphansi kokudluliswa kukawoyela negesi phansi.

I-Oil Casing iyindlela yokuphila yokugcina ukusebenza kahle.Ngenxa yezimo ezihlukene zokwakheka komhlaba, isimo sokucindezeleka ngaphansi komhlaba sokuxineka nokucindezelwa, ukugoba, kanye nemiphumela ehlangene yokucindezeleka okuguquguqukayo okusebenza kushubhu, okubeke phambili izidingo eziphakeme kukhwalithi ye-casing ngokwayo.Uma i-casing ilimele ngesizathu esithile, ingase iholele ekukhiqizweni kwemithombo, noma ngisho nokuchithwa.

Ngokusho kwamandla ensimbi, i-casing ingahlukaniswa ngezigaba ezahlukene zensimbi, okungukuthi, J55, K55, N80, L80, C90, T95, P110, Q125, V150.Njalo njalo.Izimo kahle, ukujula okuhlukile kwebanga lensimbi nakho kuhlukile.Futhi idinga i-casing ezindaweni ezigqwalile ezinokumelana nokugqwala.I-Casing enomsebenzi ophikisana nokuwa ezimeni ze-geological eziyinkimbinkimbi.