Kunezinhlobo eziningi zensimbi engagqwali, futhi umehluko wentengo nawo mkhulu uma kuqhathaniswa. Ngokombono wezindlela zokukhiqiza, kunezinhlobo zamapuleti, izinhlobo zokulingisa, nezinhlobo zokubumba. Ngokuvamile, izinhlobo zamapuleti zishibhile, ngoba iningi lamapuleti ensimbi angenasici Ikhiqizwa ngobuningi, futhi izindleko ziphansi. Izindleko zokulingisa ziyahlukahluka kuye ngobunkimbinkimbi besakhiwo. Ama-Forging acutshungulwa ngesisekelo sezinsimbi zensimbi engagqwali, ngakho-ke intengo iphakeme kunaleyo yezinsimbi ezingenasici ezivamile.

Insimbi Engagqwali I-Thimbles ivame ukusetshenziswa ekwakheni amagumbi angaphansi ukuvikela amapayipi noma izindandatho zensimbi ezisiza ukufakwa kwamapayipi.

Ukuhlukaniswa kwe-casing: I-casing eqinile, i-casing engenamanzi eguquguqukayo, i-steel tube casing, kanye ne-metal casing.