Cov qib hlau rau roj lub teb chaws tubular khoom (OCTG) casing muaj xws li H40, J55, K55, N80, L80, C90, T95, P110, Q125, V150, thiab lwm yam.; Qhov kawg kev sib txuas hom muaj xws li luv round thread (STC), ntev round thread (LTC), buttress thread (BTC), thiab tshwj xeeb kev sib txuas.
Ntsuas qhov hnyav
[(Ob txoj kab uas hla - Phab ntsa Thickness) × Phab ntsa Thickness] × 0.02466=kg/m (qhov hnyav ib meter)
Tshuaj muaj pes tsawg leeg
(1) Raws li SY/T 6194-96. Casing thiab nws cov couplings yog ua los ntawm tib qib steel. Cov ntsiab lus sulfur <0.045%, phosphorus cov ntsiab lus <0.045%;
(2) Cov qauv tshuaj ntsuam xyuas raug coj los ua raws li GB / T 222-84. Kev tshuaj xyuas tshuaj yog ua raws li cov tshooj lus tseem ceeb ntawm GB 223;
(3) Raws li API SPEC 5CT (1988, 1st Edition). Cov qauv kev npaj rau kev tshuaj xyuas tshuaj ua raws li qhov tseeb ntawm ASTM E59, thiab kev tshuaj xyuas ua raws li qhov tseeb ntawm ASTM E350.
Lub cev muaj zog
(1) Raws li SY/T 6194-96. Kev ntsuam xyuas flattening (GB 246-97), kev ntsuas tensile (GB 228-2010), thiab kev ntsuam xyuas hydrostatic tau ua;
(2) Raws li API SPEC 5CT (1988, 1st Edition): hydrostatic tests, flattening tests, sulfide stress corrosion cracking tests, hardness tests (raws li qhov tseeb version of ASTM E18 los yog E10), tensile tests, transverse impact tests (raws li qhov tseeb versions of ASTM A370, ASTM E23, ASTM E23, ASTM E23) E112 lossis lwm txoj hauv kev).
Collapse kuj yog ib qho tseem ceeb ntawm kev ua tau zoo rau cov roj casing; kev tshawb fawb siv cov qauv kev twv ua ntej xws li K-T qauv, txiav txim siab cuam tshuam rau yam xws li kev tsim khoom zoo (xws li, ovality thiab kev ntxhov siab seem). Kev tiv thaiv rau CO₂/H₂S corrosion yog ua tiav los ntawm tus nqi- tsim tau zoo, xws li cov ntsiab lus chromium tsawg; Cov txheej txheem kev txhim kho corrosion thiab cov txheej txheem tsom xam suav nrog SEM, X-ray photoelectron spectroscopy (XPS), thiab X-ray diffraction (XRD).
Kev txhim kho ntawm qib siab- cov ntaub ntawv qib-xws li ntawm 125 ksi txog 165 ksi- ua tau raws li qhov xav tau ntawm ultra- qhov dej tob; cov kev ntsuas kev ua tau zoo ntawm cov siab -lub zog, siab- cov roj hnyav hnyav sawv cev kev txhim kho ntau dua 50% piv rau cov thev naus laus zis.
Kev tshuaj xyuas xov siv tsis yog-kev sib cuag, hauv- cov txheej txheem kab- xws li thaj chaw - scan CCD thiab cov duab digital- txhawm rau txhim kho qhov raug thiab ua haujlwm tau zoo thaum txo cov xwm txheej tsis ua haujlwm.
