OCTG bụ mbiri nke Mmanụ Ala Tubular Ngwaahịa, ọkachasị na-ezo aka na ngwaahịa ọkpọkọ eji eme mmanụ na gas (ọrụ ịkwọ ụgbọ mmiri). A na-arụpụtakarị ọkpọkọ OCTG dị ka API ma ọ bụ nkọwa ọkọlọtọ metụtara ya.

Enwere ụdị isi atọ, gụnyere ọkpọkọ ọkpọkọ, casing na tubing.

Ọkpụkpọ a na-egwupụta ihe bụ ọkpọkọ siri ike nke na-enweghị nkebi nke nwere ike ịtụgharị olulu ahụ ma kesaa mmiri mmiri na-egwupụta ihe. Ọ na-enye ohere ka mmiri mmiri na-egwupụta ihe na-ebugharị site na mgbapụta site na mgbapụta ma laghachi na annulus. Pipeline na-ebu esemokwu axial, oke oke ike na nrụgide dị n'ime.

A na-eji casing na-adọba n'olulu mmiri a na-egwupụta n'okpuru ala iji nweta mmanụ. Dị nnọọ ka mgbọrọgwụ mkpara, ígwè ọkpọkọ casings nwekwara na-nagide axial esemokwu. Nke a bụ ọkpọkọ buru ibu nke a na-etinye n'ime olulu mmiri ma tinye ciment n'ebe. Ibu nke onwe nke casing, nrụgide axial, nrụgide dị n'èzí na nkume ndị gbara ya gburugburu, na nrụgide dị n'ime ahụ nke mmiri na-ekpochapụ na-emepụta ihe niile na-emepụta esemokwu axial.

Ọkpụkpọ tubing na-abanye n'ime ọkpọkọ casing n'ihi na ọ bụ ọkpọkọ mmanụ na-esi na ya pụta. Tubing bụ akụkụ kachasị mfe nke OCTG, nwere njikọ eri na nsọtụ abụọ. Enwere ike iji pipeline na-ebufe gas sitere n'okike ma ọ bụ mmanụ cru si n'ụdị mmepụta gaa n'ụlọ ọrụ, nke a ga-edozi ma gwuchaa.