Kev xaiv qib steel rau corrosive ib puag ncig ntawm cov roj thiab cov kav dej
Cov khoom siv roj thiab roj feem ntau muaj H2S thiab / lossis CO2. Ntawm lawv, qee qhov roj thiab roj qhov dej tsuas muaj H2S lossis CO2 nkaus xwb, thaum cov roj thiab roj ntau dua muaj H2S thiab CO2. Rau corrosion thiab kev tiv thaiv cov teeb meem uas tsuas yog H2S, rau ntau tshaj 50 xyoo, ntau ntawm kev tshawb fawb tau ua tiav, cov txheej txheem corrosion kuj yog qhov tseeb, tam sim no, cov txheej txheem tswj kev tiv thaiv corrosion thiab kev tiv thaiv kev tiv thaiv kuj tseem paub tab, thiab NACE MR0175 / ISO15156 yog tsim tawm thoob ntiaj teb. Cov qauv thiab cov lus qhia tshwj xeeb, Tuam Tshoj muaj peev xwm tsim API 5CT raj thiab casing ntawm API cov qauv, thiab tau tsim cov qauv kev lag luam roj SY/T0599.
Kev tshawb fawb rau Octg Pipe Materials
Hauv 20 xyoo dhau los, ntau qhov kev tshawb fawb tau ua tiav ntawm CO2 corrosion mechanism thiab kev tiv thaiv kev ntsuas nyob rau hauv qhov kub thiab txias siab. Txawm li cas los xij, rau kev kawm txog kev txhim kho corrosion thiab tsis tu ncua ntawm H2S thiab CO2 nyob rau tib lub sijhawm, vim muaj kev sib cuam tshuam ntawm H2S thiab CO2, qhov zoo tshaj plaws theoretical system tseem tsis tau tsim. Ntau qhov theoretical thiab technical teeb meem tseem tsis tau kawm ntxiv.
Txoj kev loj hlob ntawm Octg Pipe Steel Qib nyob rau hauv Suav teb
Txij li thaum pib ntawm lub xyoo pua no, qee qhov chaw roj thiab roj tau tsim nyob rau hauv ib puag ncig hnyav ntawm lub ntiaj teb. Cov teb chaws txawv teb chaws tau nce qhov kev tshawb fawb thiab kev txhim kho ntawm corrosion resistant roj zoo tubing uas tiv taus CO2 thiab CO2, H2S, Cl- coexistence (thiab ntawm chav kawm H2O). Rau kev tiv thaiv-CO2 corrosion, API Spec 5CT teev ob qib steel, L80-9Cr thiab L80-13Cr, thiab txhua lub chaw tsim khoom tau tsim nws tus kheej tsis yog API steel qib series. Xws li Nyiv JFE, Nyob Kub, Domestic Tianguan Group, Baosteel, thiab lwm yam. Kev sib koom ua ke ntawm CO2 thiab H2S, lossis H2S ib nrab siab tsis yog qhov tseem ceeb, tab sis Cl- yog siab, 13Cr steel (xws li super 13Cr steel) tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua, koj yuav tsum siv 22Cr duplex stainless hlau (ASF2205) lossis 25Cr super duplex stainless hlau. , suav nrog High Ni, Cr stainless hlau thiab Ni thiab FeNi raws li cov alloys xws li G3, 825 thiab 028 uas muaj ntau tshaj 20 feem pua Cr thiab muaj Ni30 feem pua los yog ntau dua.
Cov ntsiab lus IC ntawm Tarim thiab Chuanxi cov dej hauv av yog qhov siab heev. Kev saib xyuas tshwj xeeb yuav tsum tau them rau NKK cov lus qhia xaiv cov khoom siv thaum xaiv cov roj casings. NKK cov lus qhia kev xaiv qhia tau hais tias 22Cr duplex stainless hlau thiab 25Cr super duplex stainless hlau tsis tsuas yog muaj kev tiv thaiv corrosion zoo dua li 13Cr thiab super 13Cr roj casings, tab sis kuj muaj qhov zoo dua pitting tsis kam thiab qee qhov SSCC kuj. JFE qauv JFE-UHP-15Cr-125 thiab JFE-UHP-17Cr-110-125 muaj lub zog siab dua thiab tiv taus CO2 corrosion dua Super 13Cr, tab sis lawv tsis yog ib qho kev hloov pauv rau duplex stainless hlau nyob rau hauv siab CI tej yam kev mob.
