I-API 5CT iyindinganiso kugobolondo kawoyela yi-American Petroleum Institute, ikakhulukazi yamapayipi kawoyela, amashubhu kanye ne-casing.

I-API 5CT isikhwama samafutha esisetshenziselwa ukugaya imithombo yamafutha, okusetshenziselwa kakhulu ukumba nokuqedela udonga olufanele lokusekela, ukuqinisekisa ukuthi ukuziphatha nokuqedwa kwenqubo yokumba ngemva kokusebenza okujwayelekile kwemithombo.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.

Izakhiwo zemishini ye-API 5CT API 5CTAmashubhu ensimbi angenamthungo: