Umbhobho okhethekileyo wePetroleum usetyenziswa ikakhulu ukugrumba ioli nerhasi kunye nokuthuthwa kweoyile negesi.Ibandakanya umbhobho wokwemba i-petroleum, i-petroleum casing, kunye nombhobho wokufunxa.I-oyileumbhobho wokubholaisetyenziswa ikakhulu ukudibanisa ikhola yokomba kunye nesuntswana le-drill kunye nokuhambisa amandla okomba.Isingxobo se-oyile sisetyenziselwa kakhulu ukuxhasa udonga lwequla ngexesha nasemva kokugrunjwa ukuqinisekisa ukusebenza okuqhelekileyo kwequla lonke leoli ngexesha nasemva kokomba.Umbhobho wokufunxa ubukhulu becala uthutha ioli kunye negesi ukusuka ezantsi kwequla ukuya phezulu.

I-oyile yokubeka i-oyile yindlela yokuphila yokugcina ukusebenza kwequla le-oyile.Ngenxa yeemeko ezahlukeneyo zejoloji kunye nemeko entsonkothileyo yamandla aphantsi, iimpembelelo ezidibeneyo zoxinzelelo, ukunyanzeliswa kunye noxinzelelo lwe-torsional kumzimba wombhobho zibeka phambili iimfuno eziphezulu kumgangatho we-casing ngokwayo.Nje ukuba i-casing ngokwayo yonakaliswe ngenxa yesizathu esithile, inokukhokelela ekunciphiseni ukuveliswa kwequla lonke okanye i-scrap.

Ngokwamandla ensimbi ngokwayo, i-casing inokwahlulwa ibe ngamabakala ahlukeneyo ensimbi, okuyi-J55, K55.N80, L80, C90, T95, P110, Q125.V150 njalo njalo.Iimeko ezahlukeneyo zequla kunye nobunzulu nazo zisebenzisa amabakala entsimbi ahlukeneyo.Kwindawo enomhlwa, i-casing ngokwayo iyafuneka ukuba ibe nokumelana nokubola.Apho iimeko zejoloji zintsonkothile, i-casing iyafuneka ukuba ibe nokusebenza kokuchasana nokuwa.