Special pombi pombi inonyanya kushandiswa kune mafuta uye gasi tsime chairo uye mafuta uye gasi kutapurirana. Inosanganisira pombi yekukweva kwemafuta, mafuta ekukasira uye mafuta ekupomba. Iyo yemafuta yekudonha pombi inoshandiswa kubatanidza iyo Drill Collar kune iyo Drill Bit uye kuendesa Kudhira Simba. Casing Oiri inonyanya kushandiswa kutsigira rusvingo rwekare panguva yekudhirowa uye mushure mekupedza, kuitira kuti ive nechokwadi chekudhakwa uye kushanda kwakajairika kwetsime rose mushure mekupedzisa. Iyo pombi pombi inonyanya kuendesa mafuta uye gasi kubva pasi petsime kune iyo nzvimbo.

Kukasira kwemafutandiyo likeline yemafuta anoshanda. Nekuda kwemamiriro akasiyana ega ega, pasi pevhu mamiriro akaoma, tonile, zvinomanikidza, kukotama uye kushushikana uye kutungamira kwekuita kwepombi, iyo inoisa kumberi zvinodiwa pakuzvidira pachavo. Kana iyo casing pachayo ikakanganisika nekuda kwechimwe chikonzero, iyo tsime rese rinogona kuderedzwa kugadzirwa kana kusiiwa.

Zvinoenderana nesimba resimbi pacharo, iyo casing inogona kukamurwa kuita akasiyana simbi mamakisi, kurevaJ55, K55, N80, L80, C90, T95, P110, Q125, v150, Zvakadzika Zvakadzika, Kusvina kweGiredhi Giredhi zvakare kwakasiyanawo. Kuzvivakisa pachako kunodiwawo kuve nehurongwa hwekugadzirisa munzvimbo yakanganisa. Munzvimbo yemamiriro ezvinhu akaomarara, casing anodikanwa zvakare kuti kugona kuramba kuparara.