I-OCTG isifinyezo se-Oil Country Tubular Goods, ikakhulukazi ibhekisela emikhiqizweni yamapayipi asetshenziselwa ukukhiqizwa kukawoyela negesi (imisebenzi yokumba). Amashubhu e-OCTG avamise ukukhiqizwa ngokuya nge-API noma ukucaciswa okujwayelekile okuhlobene.

Kunezinhlobo ezintathu eziyinhloko, okuhlanganisa ipayipi lokubhoboza, i-casing kanye ne-tubing.

Ipayipi lokubhoboza liyishubhu eliqinile elingenamthungo elikwazi ukuzungezisa i-drill bit futhi lijikeleze uketshezi lokumba. Ivumela uketshezi lokumba ukuthi luphushwe endaweni yokubhoboza yiphampu bese lubuyiselwa ku-annulus. Ipayipi lithwala i-axial tension, i-torque ephezulu kakhulu kanye nomfutho ophakeme wangaphakathi.

I-Casing isetshenziselwa ukuhlanganisa i-borehole ebhojwa ngaphansi komhlaba ukuze kutholwe uwoyela. Njengama-drill rods, amapayipi ensimbi nawo kufanele amelane ne-axial tension. Leli ipayipi elinobubanzi obukhulu elifakwe emgodini bese lifakwa usimende endaweni yalo. I-self-weight ye-casing, i-axial pressure, ingcindezi yangaphandle emadwaleni azungezile, kanye nokucindezela kwangaphakathi okukhiqizwa uketshezi lwe-flush konke kukhiqiza i-axial tension.

Ipayipi lepayipi lingena ngaphakathi kwepayipi lebhokisi ngoba liyipayipi okuphuma ngalo uwoyela. I-Tubing ingxenye elula ye-OCTG, enoxhumo olunentambo emikhawulweni yomibili. Ipayipi lingasetshenziselwa ukuthutha igesi yemvelo noma uwoyela ongahluziwe usuka ezindaweni zokukhiqiza uyiswe ezikhungweni, ezizocutshungulwa ngemva kokumba.