N80 roj casingyog ib qho khoom siv tseem ceeb rau cov roj drilling. Nws cov cuab yeej tseem ceeb kuj suav nrog cov kav dej tho, cov kav dej thiab cov casings, laum dab tshos thiab cov kav hlau me me rau qhov drilling. Domestic casing yog ua los ntawm geological drilling steel los ntawm kub dov los yog txias kos duab. Tus lej hlau yog sawv cev los ntawm "geology" (DZ). Feem ntau siv cov qib steel xws li DZ40, DZ55 thiab DZ753.
API muaj peb qhov ntev: R-1 yog 4.88 ~ 7.62m, R-2 yog 7.62 ~ 10.36m, thiab R-3 yog 10.36m lossis ntau dua.
Qee cov khoom tuaj txawv teb chaws raug cim nrog LTC, uas txhais tau tias filament buckle tes tsho.
Lub hom phiaj: Feem ntau yog siv rau cov roj zoo drilling, feem ntau yog siv los txhawb cov phab ntsa zoo thaum lub sij hawm thiab tom qab drilling los xyuas kom meej lub cev ua haujlwm ntawm tag nrho lub qhov dej thaum lub sijhawm drilling thiab tom qab ua tiav.
Hom: Hom thiab ntim ntawm roj av casing yog raws li SY/T6194-96 "Petroleum Casing", luv threaded casing thiab nws coupling thiab ntev threaded casing thiab nws coupling. Raws li cov kev cai ntawm SY/T6194-96, lub tsev casings yuav tsum tau bundled nrog steel hlau los yog steel siv. Qhov nthuav tawm ntawm txhua bushing thiab txuas xov yuav tsum muaj lub nplhaib tiv thaiv threaded rau nws los tiv thaiv cov xov.
Cov Lus Qhia Tshwj Xeeb: Cov casing hauv tsev tau teev tseg hauv SY/T6194-96. Qhov ntev ntawm lub casing tsis ruaj thiab nyob ntawm 8-13m. Txawm li cas los xij, casing tsis tsawg dua 6m tuaj yeem muab tau, thiab qhov ntau yuav tsum tsis pub tshaj 20%.
Cov tsos mob: yuav tsum tsis muaj folding, cov kab plaub hau, sib cais, tawg, curling, crusting, thiab lwm yam nyob rau sab hauv thiab sab nrauv ntawm lub casing. Cov teeb meem no yuav tsum tau muab tshem tawm tag nrho, thiab qhov tob tshem tawm yuav tsum tsis pub tshaj 12.5% ntawm nominal phab ntsa thickness.
Cov kev xav tau zoo: Cov xov tooj ntawm cov casing thiab coupling yuav tsum du, tsis muaj burrs, kua muag thiab lwm yam tsis xws luag uas tuaj yeem ua rau xov tawg thiab cuam tshuam rau lub zog thiab nruj ntawm kev sib koom ua ke.
Pob:
Raws li cov kev cai ntawm SY/T6194-96, lub tsev casings yuav tsum tau bundled nrog steel hlau los yog steel siv. Qhov nthuav dav ntawm txhua bushing thiab txuas xov yuav tsum tau muab ntsia rau ntawm lub nplhaib tiv thaiv kom tiv thaiv cov xov.
Chemical composition test:
(1) Raws li SY/T6194-96. Lub casing thiab nws cov couplings yog tib qib steel. Cov ntsiab lus sulfur<0.045%, phosphorus content <0.045%.
(2) Siv cov qauv tshuaj ntsuam xyuas raws li cov cai ntawm GB222-84. Tshuaj ntsuam xyuas tau ua raws li cov kev cai cuam tshuam ntawm GB223.
Roj casing xam formula:
Sab nraud txoj kab uas hla - phab ntsa thickness) * phab ntsa thickness * 0 02466=kg/m (qhov hnyav ib meter)
lwm yam:
Raws li American Petroleum Institute tus qauv APISPEC5CT 1988 thawj tsab, casing steel qib H-40,J-55, K-55, N-80, C-75, L-80, C-90, C-95, P- 110 thiab Q-125, tag nrho ntawm 10 hom.
