Hlau casing tube yog ib hom hollow cylindrical yeeb nkab uas feem ntau siv hauv kev lag luam roj thiab roj drilling. Nws yog tsim los tiv thaiv lub borehole thiab txhawb cov phab ntsa hauv lub qhov dej thaum lub sijhawm drilling, ua tiav, thiab kev ua haujlwm ntau lawm. Hlau casing tube yog tsim los ntawm cov hlau zoo thiab muaj cov kav ntev thiab lub zog zoo. Nws kuj yog resistant rau corrosion, pressures, thiab kub uas muaj nyob rau hauv cov roj thiab roj drilling ua hauj lwm.
Cov ntaub ntawv siv los ua steel casing raj yog ua tib zoo xaiv raws li lawv cov yam ntxwv ua tau zoo. Lawv feem ntau yog tsim los ntawm qib high-qib steel alloys uas tau tsim tshwj xeeb rau kev siv nyob rau hauv ib puag ncig hnyav. Cov alloys paub txog lawv cov cuab yeej zoo heev, xws li lub zog tensile siab, toughness, thiab hardness, uas ua rau lawv zoo tagnrho rau kev siv hauv kev ua haujlwm drilling.
Qee cov ntaub ntawv siv los ua cov hlau casing muaj xws li carbon steel, alloy steel, stainless hlau, thiab duplex steel. Cov pa roj carbon steel yog cov khoom siv feem ntau siv los ua cov hlau casing vim nws pheej yig, yooj yim los tsim, thiab muaj kev tiv thaiv corrosion zoo. Alloy steel tseem nrov vim nws muaj cov khoom siv kho tshuab zoo dua li carbon steel thiab tuaj yeem tiv taus siab thiab kub.
Stainless hlau yog lwm yam khoom siv los ua steel casing hlab. Nws tiv taus corrosion heev thiab tuaj yeem tiv taus ib puag ncig hnyav, ua rau nws muaj kev xaiv nrov hauv kev lag luam offshore drilling. Duplex steel kuj tseem siv los ua steel casing hlab vim nws muaj kev sib xyaw zoo ntawm lub zog thiab kev tiv thaiv corrosion.
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