Isikhwamaibalulekile emishinini yokumba uwoyela, futhi izinto zayo eziyinhloko zihlanganisa ukubhoboza, ipayipi eliwumgogodla kanye ne-casing, amakholomu okubhola nokubhoboza ipayipi lensimbi elinobubanzi obuncane nokunye.

I-casing isetshenziselwa ukusekela udonga lwamafutha negesi lwepayipi, ukuqinisekisa ukuthi ukubhoboza nokuqedwa kwenqubo yokusebenza okujwayelekile kwemithombo.Kuye ngokubhola ukujula komthombo ngamunye kanye nezimo ze-geological, ukusebenzisa izingqimba eziningana ze-casing.I-Casing cementing yehla ngemva kokuyisebenzisa nge-tubing, ipayipi yokubhoboza ihlukile, ayikwazi ukuphinda isetshenziswe, izinto ezisebenzisekayo zesikhathi esisodwa.Ngakho-ke, ukusetshenziswa okuphelele kwe-casing kungu-70% wepayipi lomthombo wamafutha.I-Casing ingahlukaniswa ngokuya ngokusetshenziswa: i-catheter, i-surface casing, i-casing kanye ne-casing yokukhiqiza.I-Casing iyipayipi enobubanzi obukhulu, idlala imithombo engaguquki kawoyela negesi, noma umphumela wodonga lwe-wellbore.Igodi lifakwa embobeni yomthombo, lihlanganiswe nosimende ukuvimbela ukwakheka kanye nokudilika kwemgodi ohlukanisiwe kanye nokuqinisekisa ukuzungeza kodaka lokumba endaweni embiwayo.

I-Casing isetshenziselwa kakhulu ukumba imithombo kawoyela ngesikhathi sokumba futhi ngemva kokuphothulwa kodonga lokusekela ukuze kuqinisekiswe ukuthi ukuqhutshwa kwenqubo yokumba kanye nokuqedwa kwemithombo ngemva kokusebenza okuvamile kwe-oil casing evamile.I-OCTG isetshenziselwa kakhulu ukumba imithombo kawoyela negesi kanye nokuthuthwa kukawoyela negesi.Kuhlanganisa ipayipi lokumba uwoyela, isikhwama sikawoyela, ishubhu yepompo.Amapayipi okubhola uwoyela asetshenziswa ngokuyinhloko ukuxhuma ikhola yokubhoboza kanye nokubhoboza nokudlula amandla okubhola.I-Casing isetshenziselwa kakhulu ukumba nokuphothulwa kodonga olufanele lokusekela, ukuqinisekisa ukuthi ukuziphatha nokuqedwa kwenqubo yokumba ngemva kokusebenza okujwayelekile kwemithombo.Imithombo yokumpompa ngaphansi kweshubhu ngokuvamile izoba uwoyela, igesi ethuthwa phansi.I-Casing iwukugcina imithombo ihamba phambili.Njengezimo ezihlukahlukene ze-geological, isimo sokucindezeleka esiyinkimbinkimbi esingaphansi komhlaba, ukudonsa, ukucindezela, ukugoba, ukucindezeleka kwe-torsional okusebenza ngomphumela ohlangene we-tube, okuyinto i-casing ngokwayo, ikhwalithi yezidingo eziphakeme.Uma igobolondo ngokwalo selilimele ngesizathu esithile, kungaholela emithonjeni yonke yokukhiqiza, noma ngisho nokuchithwa.