Petroleum yakakosha pombi inonyanya kushandiswa kuchera mafuta uye gasi matsime uye kutakura oiri uye gasi.Inosanganisira petroleum yekuchera pombi, petroleum casing, uye sucker pombi.Mafutachibooresa pombiinonyanya kushandiswa kubatanidza drill collar uye drill bit uye kutumira simba rekuchera.Oiri casing inonyanya kushandiswa kutsigira chibhorani madziro panguva uye mushure mekuchera kuti ive nechokwadi chekushanda kwakajairika kwechitsime chemafuta panguva uye mushure mekuchera.Pombi inoyamwa inonyanya kutakura mafuta uye gasi kubva pasi petsime kusvika pamusoro.

Oiri casing ndiyo nzira yehupenyu kuchengetedza oiri kushanda zvakanaka.Nekuda kwemamiriro akasiyana e geological mamiriro uye yakaoma mamiriro eiyo downhole simba, iyo yakasanganiswa mhedzisiro yekutemesa, kudzvanya uye torsional kushushikana pamuviri wepombi inoisa pamberi pepamusoro zvinodiwa zvemhando yecasing pachayo.Kana iyo casing pachayo ichinge yakuvadzwa nekuda kwechimwe chikonzero, inogona kutungamira kuderedzwa kugadzirwa kwetsime rese kana kunyange zvimedu.

Maererano nesimba resimbi pachayo, casing inogona kugoverwa muzvikamu zvakasiyana zvesimbi, iyo J55, K55.N80, L80, C90, T95, P110, Q125.V150 zvichingodaro.Yakasiyana tsime mamiriro uye kudzika zvakare kushandisa akasiyana simbi mamakisi.Munzvimbo ine corrosion, iyo casing pachayo inodiwawo kuve necorrosion resistance.Ikoko mamiriro e geological akaoma, casing inodiwawo kuve ne-anti-collapse performance.