OCTG ke khutsufatso ea Oil Country Tubular Goods, haholo-holo e bua ka lihlahisoa tsa lipeipi tse sebelisetsoang tlhahiso ea oli le khase (mesebetsi ea ho cheka). Li-tubes tsa OCTG hangata li etsoa ho latela API kapa lintlha tse amanang le tsona.

Ho na le mefuta e meraro ea mantlha, ho kenyelletsa le phala ea ho phunya, casing le li-tubing.

Pipe ea ho phunya ke tšupu e tiileng e se nang moroallo e khonang ho potoloha karoloana ea ho phunya le ho potoloha mokelikeli oa ho phunya. E lumella mokelikeli oa ho cheka hore o sututsoe ka har'a karolo ea ho phunya ke pompo ebe o khutlela ho annulus. Phaephe e na le tsitsipano ea axial, torque e phahameng haholo le khatello e phahameng ea kahare.

Casing e sebelisetsoa ho thea sekoti se chekiloeng ka tlas'a lefatše ho fumana oli. Joalo ka melamu ea ho cheka, liphaephe tsa tšepe le tsona li tlameha ho mamella tsitsipano ea axial. Ena ke phala ea bophara bo boholo e kentsoeng ka har'a sekoti ebe e kenngoa samente. Boima bo ikemetseng ba casing, khatello ea axial, khatello ea ka ntle holim'a majoe a potolohileng, le khatello ea ka hare e hlahisoang ke flush ea mokelikeli kaofela li hlahisa tsitsipano ea axial.

Pipe e kenang ka har'a phala ea casing hobane ke phala eo oli e ntšang ka eona. Tubing ke karolo e bonolo ka ho fetisisa ea OCTG, e nang le likhokahano tse khoele lipheletsong ka bobeli. Peipi e ka sebelisoa ho tsamaisa khase ea tlhaho kapa oli e tala ho tloha mefuteng ea tlhahiso ho ea litsing, tse tla sebetsoa ka mor'a ho cheka.