Amapayipi kawoyela akhethekile asetshenziselwa ikakhulukazi ukumba imithombo kawoyela negesi kanye nokuthutha uwoyela negesi. Kuhlanganisa ipayipi lokumba uwoyela, isikhwama sikawoyela, nepayipi elimpompa uwoyela. Ipayipi lokubhola likawoyela lisetshenziselwa ikakhulukazi ukuxhuma amakholomu okubhoboza kanye nezingcezu zokubhola kanye nokudlulisa amandla okumba. I-oil casing isetshenziselwa ngokuyinhloko ukusekela udonga lomthombo ngesikhathi sokumba futhi ngemva kokuphothulwa kahle ukuze kuqinisekiswe inqubo yokubhoboza kanye nokusebenza okuvamile kwawo wonke umthombo wamafutha ngemva kokuqedwa. Ipayipi lokumpompa ngokuyinhloko lithutha uwoyela negesi ukusuka phansi komthombo kawoyela ukuya phezulu.

Isikhwama sikawoyela siyindlela yokuphila yokugcina ukusebenza kwemithombo kawoyela. Ngenxa yezimo ezihlukene zokwakheka komhlaba kanye nezimo zengcindezi eziyinkimbinkimbi, ukucindezelwa, ukucindezelwa, ukugoba, kanye nezingcindezi ze-torsion kusebenza ngokugcwele emzimbeni wamapayipi, okubeka izidingo eziphakeme kukhwalithi yekesi ngokwalo. Uma i-casing ngokwayo ilimele ngesizathu esithile, wonke umthombo ungase uncishiswe ekukhiqizeni noma ngisho nokuchithwa.

Ngokusho kwamandla ensimbi ngokwayo, i-casing ingahlukaniswa ngamamaki ensimbi ahlukene, okuyi-J55, K55, N80, L80, C90, T95, P110, Q125, V150, njll. Izimo ezihlukene zomthombo kanye nokujula kwemithombo kudinga amamaki ensimbi ahlukene. . Ezindaweni ezonakalisayo, i-casing ngokwayo nayo iyadingeka ukuze ibe nokuvikeleka kokugqwala. Ezindaweni ezinezimo ze-geological eziyinkimbinkimbi, i-casing nayo iyadingeka ukuthi ibe nezindawo zokulwa nokuwa.