I-OCTG isifinyezo se-Oil Country Tubular Goods, ikakhulukazi 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 iyingxenye elula ye-OCTG, enoxhumo olunentambo emikhawulweni yomibili.Ipayipi lingasetshenziselwa ukuthutha igesi yemvelo noma uwoyela ongahluziwe usuka ezindaweni zokukhiqiza uyiswe ezikhungweni, ezizocutshungulwa ngemva kokumba.