OCTG ndiyo chidimbu cheOil Country Tubular Goods, inonyanya kureva zvigadzirwa zvepombi zvinoshandiswa kugadzira mafuta uye gasi (zviitwa zvekuchera). OCTG machubhu anowanzo gadzirwa zvinoenderana neAPI kana zvinoenderana neyakajairwa yakatarwa.

Kune marudzi matatu makuru, anosanganisira drill pombi, casing uye tubing.

Pombi yekuboorera ichubhu yakasimba isina musono inokwanisa kutenderedza chibhorani ichitenderedza mvura yekuchera. Inobvumira mvura yekuchera kuti isunda kuburikidza nebhiti rekuchera nepombi uye inodzokera kune annulus. Iyo pombi inotakura axial tension, yakanyanya kukwirisa torque uye yakanyanya kumanikidza yemukati.

Casing inoshandiswa kutara chibhorani chinocherwa pasi pevhu kuti pawane mafuta. Kungofanana netsvimbo yekuchera, simbi pombi casings zvakare inofanirwa kumira axial tension. Iyi ipombi yakakura-dhayamita inopinzwa muchibhorani yoiswa simende panzvimbo. Iyo yekuzvimiririra kurema kwekasi, iyo axial pressure, kunze kwekumanikidza pamatombo akatenderedza, uye kumanikidzwa kwemukati kunokonzerwa neiyo fluid flush zvese zvinoburitsa axial tension.

Tubing pombi inopinda mukati mepombi yecasing nekuti ndiyo pombi iyo mafuta anobuda nayo. Tubing ndiyo yakapfava chikamu cheOCTG, ine tambo dzekubatanidza kumativi ese ari maviri. Iyo pombi inogona kushandiswa kutakura gasi rechisikigo kana crude oiri kubva pakugadzira mafomu kuenda kunzvimbo, iyo inozogadziriswa mushure mekuchera.