OCTG Casing yog dab tsi
OCTG stands rau roj lub teb chaws tubular cov khoom, tsev neeg ntawm steel tubulars siv laum thiab ua kom tiav ib tug roj los yog gas qhov dej. Casing yog tus tswv cuab loj tshaj plaws ntawm tsev neeg: nws tau khiav mus rau hauv lub qhov dej tom qab drilling, cemented nyob rau hauv qhov chaw tiv thaiv kev tsim, thiab sab laug rau lub neej ntawm lub qhov dej. Tsis zoo li tubing thiab laum yeeb nkab, casing tsis zoo, yog li nws yog kho raws li ib tug consumable thiab account rau feem ntau ntawm cov tubular tonnage noj nyob rau hauv lub qhov dej.
Casing yog tsim los rau API Specification 5CT, uas kho cov qib steel, qhov ntev, phab ntsa thicknesses, xov cov ntaub ntawv, couplings thiab kev xeem tswj. Nws yog muab los ua seamless yeeb nkab nyob rau hauv feem ntau ntawm cov neeg mob, nrog hluav taws xob kuj welded yeeb nkab txais nyob rau hauv cov qib qis thiab me me.
Casing Strings thiab lawv cov dej num
Tus neeg xyuas pib casing: thawj txoj hlua, teem rau hauv qhov tob tob kom cov txheej txheem saum npoo qhib thiab rov qab drilling kua.
Nto casing: cais tawm tshiab - dej aquifers thiab nqa cov cuab yeej tiv thaiv tshuab.
Nruab nrab lossis cov txheej txheem txheej txheem: kaw cov teeb meem thaj chaw xws li ploj - kev tsim tawm los yog dhau - cov shales siab ua ntej drilling tob.
Production casing: txoj hlua zaum kawg, teeb tsa los ntawm lub reservoir thiab perforated kom hydrocarbons nkag mus rau hauv lub qhov dej.
Txhua txoj hlua yog cemented tom qab nws khiav, uas kaw lub annulus ntawm cov yeeb nkab thiab borehole phab ntsa, tiv thaiv cov dej tsiv teb tsaws ntawm cov formations, thiab txhawb cov yeeb nkab tiv thaiv lub cev qhuav dej. Cov hlua ntau lawm nqa cov packers thiab twj tso kua mis, thiab cov tubing uas tom qab conveys cov roj los yog roj yog landed rau hauv nws.
API 5CT Qib thiab cov txiaj ntsig muaj zog
Qib xaiv nyob ntawm qhov yuav tsum tau muaj kev sib tsoo, tawg thiab tensile load. API 5CT txhais cov txiaj ntsig lub zog ntawm txhua qib raws li hauv qab no:
| Qib | Hom | Yield zog ntau yam | Tsawg kawg tensile zog |
| H40 | Plain | 276-552 MPa | 414 MPa ua |
| J55 | Plain | 379-552 MPa | 517 MPa ua |
| K55 | Plain | 379-552 MPa | 655 MPa ua |
| N80 | Plain | 552-758 MPa | 689mpa ua |
| L80 | Tswj tau tawm los, H2S kev pabcuam | 552-655 MPa | 655 MPa ua |
| C90 | Tswj tau tawm los, H2S kev pabcuam | 621-724 MPa | 689mpa ua |
| T95 | Tswj tau tawm los, H2S kev pabcuam | 655-758 MPa | 724 MPa ua |
| P110 | Plain | 758-965 MPa | 862 MPa |
| Q125 | Plain | 862–1034 MPa | 931mpa ua |
Cov qib L, C thiab T yog tsim los ntawm quenching thiab tempering, tuav ib tug nruj tswj yield band thiab siab tshaj plaws hardness, thiab yog npaj rau lub qhov dej uas muaj hydrogen sulphide. Cov qhabnias dawb yog muab los ntawm -rolled lossis normalized.
Dimensions, kev sib txuas thiab kev tshuaj xyuas
Feem ntau cov casing sab nraud txoj kab uas hla khiav ntawm 114.3 hli (4-1/2 nyob rau hauv) mus txog 508 hli (20 nyob rau hauv), nrog rau phab ntsa thicknesses xaiv los siav lub cev qhuav dej thiab tawg tsim. Kev sib txuas muaj xws li cov xov xov luv luv, cov xov kab ntev thiab lub taub hau xov, tag nrho nrog cov sib txuas sib txuas, ntxiv rau kev sib txuas ntawm cov khoom siv uas muaj roj nruj hauv kev sib xyaw ua ke yog qhov tseem ceeb. Buttress threads yog nyiam rau hnyav- phab ntsa thiab cov hlua loj-ntev vim tias cov khoom siv thauj khoom muaj zog tensile ntau dua li cov xov puag ncig ntawm tib qhov loj.
API 5CT yuav tsum tau kuaj xyuas cov tshuaj muaj pes tsawg leeg, ntsuas tensile, flattening los yog dabtsi yog khoov kev ntsuam xyuas ntawm cov yeeb nkab welded, hydrostatic kuaj, kev soj ntsuam qhov ntev thiab, rau cov kev tswj hwm - qib tawm, kuaj hardness thiab cuam tshuam. Couplings raug tshuaj xyuas nyias. Tag nrho traceability los ntawm cov xov tooj cua sov kom tiav kev sib koom ua ke yog tus qauv kev cia siab rau kev txiav txim xa tawm.
Yuav Ua Li Cas Qhia Casing ntawm Kev Yuav Khoom
Qib thiab cov khoom specification, ua ke nrog tus qauv tsab.
Sab nraud txoj kab uas hla, phab ntsa thickness los yog hnyav tsim, thiab daim ntawv xov.
Ntev ntev: ntau yam 1, 2 lossis 3.
Txawm hais tias txoj hlua yog rau kev pabcuam qab zib lossis qaub, uas txiav txim siab ntawm qib qis thiab qib L, C lossis T.
Cov kev xav tau ntxiv xws li kev ntsuas qhov ntsuas kub, drift inch, coupling type thiab marking.
FAQ
Q: OCTG casing ua dab tsi hauv qhov dej?
Nws txhawb nqa cov phab ntsa ntawm lub qhov dej tawm tsam kev sib tsoo, kaw cov roj sib txawv, cov roj thiab cov dej hauv cheeb tsam, muab lub siab ntim uas xav tau rau kev tawg thiab acidizing, thiab tsim txoj hauv kev ntws los ntawm cov tubing ua rau lub qhov dej.
Q: Vim li cas lub casing cemented?
Cement sau lub annulus ntawm cov yeeb nkab thiab tsim. Nws txhawb nqa lub casing, tiv thaiv cov dej tsiv teb tsaws ntawm thaj chaw permeable, thiab tiv thaiv cov yeeb nkab los ntawm kev tsim cov kua dej thiab kev puas tsuaj ntawm cov khoom siv tom qab drilling.
Q: Qib API 5CT twg yuav tsum raug xaiv rau lub qhov dej qaub?
Cov kev pabcuam qaub hu rau kev tswj hwm - qib siab xws li L80, C90 lossis T95. Cov qib no yog quenched thiab tempered nrog txwv tsis pub tawm los ntau thiab siab tshaj plaws hardness kom lawv tiv thaiv sulphide kev nyuaj siab tawg.
Q: Qhov txawv ntawm casing thiab tubing yog dab tsi?
Casing yog txoj hlua ruaj khov sab nrauv cemented hauv qhov dej; tubing yog cov yeeb nkab me me khiav hauv lub casing los xa cov khoom mus rau saum npoo, thiab nws tuaj yeem rub thiab hloov. Casing yog ib qho khoom siv uas nyob hauv av.
Q: Cov ntaub ntawv xov twg muaj rau casing?
Cov xov luv luv, cov xov kab ntev thiab lub taub hau xov yog cov qauv API cov ntaub ntawv, tag nrho nrog cov txuas txuas. Cov kev sib txuas hwm yog siv qhov hlau - mus rau - hlau sealing thiab roj nruj raws li qhov nro, compression thiab dabtsi yog khoov.
Q: Casing kuaj ua ntej xa zaub mov?
API 5CT yuav tsum tau kuaj tshuaj thiab tensile, kuaj qhov ntev, kuaj hydrostatic, thiab flattening los yog dabtsi yog khoov kuaj rau welded yeeb nkab. Cov kev tswj hwm - cov qib tawm los kuj yuav tsum muaj kev ntsuas qhov tawv thiab qhov cuam tshuam, thiab cov couplings raug txheeb xyuas nyias.
