Casing tuaj yeem muab faib ua pawg hauv qab no raws li nws txoj haujlwm:
1. Lub casing nto muaj ob lub luag haujlwm tseem ceeb. Ib qho yog txhawm rau nruab lub taub hau casing rau saum, thiab dai thiab txhawb cov txheej tom ntej ntawm casing los ntawm lub taub hau casing. Qhov thib ob yog cais cov txheej txheem dej ntiav thiab ntiav ntiav, kom cov dej tshiab tsis muaj kuab paug los ntawm cov kua dej.
2. Intermediate casing yog siv los cais cov khaubncaws sab nraud povtseg nrog sib txawv pore pressures los yog complex formations uas nquag mus vau thiab to.
3.Production casing yog qhov kawg casing drilled rau hauv lub hom phiaj cheeb tsam. Nws tiv thaiv thaj chaw tsim khoom thiab muab kev nkag mus rau cov roj thiab cov roj ntws los ntawm cheeb tsam mus rau saum npoo.
4.Drilling liner, uas ua raws li qhov nruab nrab casing.
