OCTG yog lub npe luv ntawm Roj Lub Tebchaws Tubular Cov Khoom, feem ntau yog hais txog cov khoom siv hauv cov kav dej siv rau cov roj thiab roj ntau lawm (drilling activities).OCTG raj feem ntau yog tsim raws li API lossis lwm yam kev qhia tshwj xeeb.

Muaj peb yam tseem ceeb, xws li laum yeeb nkab, casing thiab tubing.

Lub laum yeeb nkab yog ib lub raj ruaj khov seamless uas tuaj yeem tig lub laum me ntsis thiab ncig cov dej drilling.Nws tso cai rau cov kua dej drilling tau raug thawb los ntawm kev xyaum me ntsis los ntawm lub twj tso kua mis thiab rov qab mus rau lub annulus.Lub raj xa dej dais axial nro, tsis tshua muaj siab torque thiab siab sab hauv.

Casing yog siv los ua kab lub borehole uas yog drilled underground kom tau roj.Ib yam li laum rods, steel yeeb nkab casings kuj yuav tsum tau tiv axial nro.Qhov no yog ib tug loj-inch yeeb nkab tso rau hauv ib tug borehole thiab cemented nyob rau hauv qhov chaw.Tus kheej qhov hnyav ntawm lub casing, lub siab axial, lub siab sab nraud ntawm cov pob zeb nyob ib puag ncig, thiab lub siab sab hauv tsim los ntawm cov kua dej ntws tawm tag nrho tsim cov axial nro.

Tubing yeeb nkab mus rau hauv cov yeeb nkab casing vim nws yog cov yeeb nkab uas cov roj ua rau nws txoj kev tawm.Tubing yog qhov yooj yim tshaj plaws ntawm OCTG, nrog cov xov sib txuas ntawm ob qho kawg.Lub raj xa dej tuaj yeem siv los thauj cov nkev lossis roj av los ntawm kev tsim khoom mus rau cov chaw, uas yuav ua tiav tom qab drilling.