Roj Lub Tebchaws Tubular Cov Khoom, feem ntau hu ua OCTG yeeb nkab, yog cov khoom tshwj xeeb steel tubular cov khoom siv hauv kev drilling thiab tsim cov roj thiab cov nkev zoo. Tsis zoo li cov pa roj carbon steel yeeb nkab siv hauv kev tsim kho lossis kev thauj cov kua dej, OCTG cov kav dej ua haujlwm nyob rau hauv siab -siab, siab - kub, thiab tshuaj lom neeg ua phem hauv qhov chaw ib puag ncig. Lawv cov qauv tsim sib xyaw ua ke txhua yam muaj zog, kev ua kom zoo hlau metallurgical, thiab qhov tseeb qhov tseeb kom ntseeg tau tias muaj kev ncaj ncees thoob plaws hauv tag nrho lub neej ntawm lub qhov dej.
OCTG cov kav dej yog tswj hwm los ntawm cov qauv thoob ntiaj teb nruj, tshwj xeeb tshaj yog API 5CT, uas txhais tau hais tias yuav tsum muaj cov khoom siv qib siab, kev kho cua sov, cov khoom siv kho tshuab, cov txheej txheem tshuaj xyuas, thiab qhov ntev ntev. Nkag siab txog OCTG yeeb nkab pib nrog kev paub txog nws cov haujlwm ua haujlwm thiab cov logic engineering tom qab nws qhov kev faib tawm.
Kev faib tawm ntawm OCTG Pipe
Casing Yeeb
Casing yeeb nkab yog ntsia rau hauv lub qhov dej tom qab drilling thiab yog cemented nyob rau hauv qhov chaw los muab kev txhawb nqa thiab cais geological formations. Nws lub hom phiaj tseem ceeb yog tiv thaiv kom tsis txhob muaj qhov sib tsoo zoo thiab tiv thaiv cov dej hauv av los ntawm kev sib kis. Cov hlua casing tau nruab rau hauv cov theem, suav nrog cov casing saum npoo, nruab nrab casing, thiab cov casing ntau lawm, nyob ntawm qhov tob tob thiab geological tej yam kev mob.
Lub tshuab ua haujlwm ntawm cov casing yuav tsum tiv taus lub zog sab nraud los ntawm ib puag ncig tsim, sab hauv tawg siab los ntawm cov kua dej los yog tsim cov hydrocarbons, thiab axial loads los ntawm cov yeeb nkab hnyav thiab thermal expansion.
Cov yeeb nkab
Tubing yeeb nkab yog muab tso rau hauv lub casing thiab ua hauj lwm raws li lub conduit rau thauj cov roj los yog roj los ntawm lub reservoir mus rau saum npoo. Tsis zoo li casing, tubing yog tshem tau thiab tuaj yeem hloov tau thaum ua haujlwm ua haujlwm. Vim tias cov raj xa ncaj qha mus rau cov kua dej ntau lawm, nws yuav tsum tiv thaiv sab hauv siab, corrosion, thiab yaig.
Hauv ntau qhov dej ntau lawm, kev xaiv tubing nyob ntawm cov kua dej chemistry, tus nqi ntws, thiab qhov kub ntawm qhov downhole. Corrosion- cov qib tiv taus lossis cov kav dej tshwj xeeb uas kho cov pa roj carbon steel feem ntau raug xaiv rau kev pabcuam qaub lossis siab -CO₂ ib puag ncig.
Drill Pipe
Drilling yeeb nkab yog siv thaum lub sij hawm drilling theem kom xa torque thiab drilling kua los ntawm qhov chaw mus rau lub laum ntsis. Nws raug rau cyclic torsion, nro, thiab dabtsi yog khoov stresses. Txawm hais tias lub laum yeeb nkab belongs rau tsev neeg OCTG, nws lub sij hawm kev pab cuam feem ntau luv dua casing thiab tubing, raws li nws raug tshem tawm tom qab drilling tiav.
Cov lus hauv qab no qhia txog qhov tseem ceeb ntawm kev sib txawv ntawm OCTG pawg.
| OCTG Hom | Main Function | Kev Nyuaj Siab | Installation Status | Lub Sijhawm Kev Pabcuam |
|---|---|---|---|---|
| Casing | Kev txhawb nqa zoo thiab tsim kev sib cais | Sab nraud siab, axial load | Cemented mus tas li | Ntev -lub sij hawm |
| Tubing | Kev thauj cov kua dej ntau lawm | Sab hauv siab, corrosion | Tshem tau | Nruab nrab mus rau ntev -term |
| Drill Pipe | Torque thiab kua kis tau tus mob | Torsion thiab cyclic loading | Ib ntus | Drilling theem |
Material Composition thiab Mechanical Properties
Carbon Steel ua lub Foundation
Feem ntau cov kav dej OCTG yog tsim los ntawm siab - zoo carbon steel los yog qis- hlau alloy. Cov pa roj carbon steel muab qhov zoo sib npaug ntawm lub zog, ductility, weldability, thiab nqi zog. Cov ntsiab lus carbon yog ua tib zoo tswj kom ua tiav qhov xav tau kev ua haujlwm zoo yam tsis muaj kev cuam tshuam toughness.
Cov txheej txheem kev kho cua sov xws li normalizing, quenching, thiab tempering yog siv los kho cov qauv nplej thiab txhim kho cov khoom muaj zog thiab kev cuam tshuam. Cov kev kho mob no yog ib qho tseem ceeb vim hais tias downhole tej yam kev mob yuav ua rau nkig tawg yog hais tias cov khoom tsis txaus toughness.
Mechanical Performance Indicators
Cov neeg kho tshuab kev ntseeg siab ntawm OCTG yeeb nkab yog ntsuas los ntawm qhov tsis xws li lub zog tawm los, lub zog tensile, elongation, hardness, thiab cuam tshuam toughness. Siab dua - cov ntaub ntawv qib yog xav tau rau cov qhov tob tob uas qhov siab thiab kub nce siab.
Hauv qab no yog kev sib piv ntawm cov API casing thiab cov qib tubing los qhia txog qhov sib txawv ntawm lub zog.
| API Qib | Yam tsawg kawg nkaus tawm lub zog (MPa) | Daim ntawv thov | Environmental Suitability |
|---|---|---|---|
| J55 | 379 | Qhov dej ntiav | Cov mob me |
| K55 | 379 | Kev pabcuam dav dav | Standard ib puag ncig |
| N80 | 552 | Nruab nrab- qhov tob tob | Siab siab |
| L80 | 552 | Lub qhov dej ua kua qaub | H₂S tsis kam |
| P110 | 758 | Sib sib zog nqus siab - qhov dej siab | Kev ntxhov siab ib puag ncig |
Kev xaiv qib ncaj qha cuam tshuam rau kev nyab xeeb thiab kev ua haujlwm ntawm kev lag luam. Tshaj -cov ntaub ntawv tshwj xeeb nce nqi, thaum nyob hauv - qhia txog kev pheej hmoo ntxiv.
Kev tsim cov txheej txheem ntawm OCTG Yeeb Nkab
OCTG kav yog tsim los ntawm seamless los yog welded txheej txheem, nyob ntawm seb qhov loj thiab kev ua tau zoo. Seamless kav yog tsim los ntawm kev tho ib lub pob zeb thiab dov rau hauv lub raj hollow. Txoj kev no ua kom cov qauv zoo ib yam thiab ua haujlwm siab. Cov kav dej welded, tshwj xeeb tshaj yog cov khoom siv hluav taws xob tiv thaiv welded (ERW), feem ntau yog siv rau qee qhov kev siv cov casing thiab tubing qhov twg cov nqi ua haujlwm tseem ceeb thiab kev ua haujlwm yog nruab nrab.
Tom qab tsim, cov kav dej tau txais kev kho cua sov, ncaj nraim, threading, tshuaj xyuas, thiab kuaj hydrostatic. Tsis yog-kev kuaj kev puas tsuaj xws li kev tshuaj xyuas ultrasonic thiab electromagnetic kuaj xyuas kom tsis muaj qhov tsis xws luag sab hauv thiab saum npoo.
Threading yog qhov tseem ceeb tshwj xeeb rau cov khoom lag luam OCTG. Kev sib txuas yuav tsum muab ob qho tib si txhua yam muaj zog thiab xau- nruj sealing. Kev sib txuas hwm nrog cov xov xov zoo tshaj plaws feem ntau yog siv rau hauv siab - siab los yog offshore qhov dej los tiv thaiv kev tsiv teb tsaws roj.
Kev Ua Haujlwm Sib Tw thiab Kev Tswj Xyuas Kev Nyab Xeeb
OCTG kav dej ua haujlwm nyob rau hauv ib puag ncig uas ua rau muaj kev ntxhov siab ntau, cov kua dej corrosive, thiab thermal cycling. Cov kev pheej hmoo feem ntau suav nrog kev tawg tsis ua haujlwm, tawg tawg, kev puas tsuaj corrosion, thiab sulfide kev ntxhov siab tawg. Txhawm rau txo cov kev pheej hmoo no, engineers ua cov lus qhia ntxaws ntxaws, kev txheeb xyuas corrosion, thiab kev tshawb fawb txog cov khoom siv ua ntej xaiv cov qib yeeb nkab.
Cov tswv yim tiv thaiv corrosion tej zaum yuav muaj xws li txheej txheej, corrosion inhibitors, los yog xaiv cov qaub - pab pawg nrog tswj hardness. Hauv cov ntawv thov hauv ntug dej hiav txwv thiab dej tob, kev tsim qauv nruj dua yog siv vim muaj kev pheej hmoo ua haujlwm ntau dua.
Cov Qauv Zoo thiab Daim Ntawv Thov Thoob Ntiaj Teb
Cov phiaj xwm roj thiab roj thoob ntiaj teb vam khom rau cov txheej txheem OCTG cov lus qhia los xyuas kom muaj kev sib hloov thiab kev ntseeg tau. API 5CT yog tus qauv siv dav tshaj plaws, tab sis cov kev xav tau ntxiv yuav raug txiav txim los ntawm cov neeg ua haujlwm rau cov qhov dej tseem ceeb. Kev ruaj ntseg zoo suav nrog kev tshuaj xyuas qhov ntev, kev sim tshuab, tshuaj xyuas tshuaj, thiab cov ntaub ntawv taug qab.
Thoob plaws ntiaj teb, OCTG xav tau sib cuam tshuam nrog kev ua haujlwm drilling. Raws li kev tshawb nrhiav nthuav dav mus rau hauv qhov tob thiab ntau cov reservoirs, qhov kev ua tau zoo ntawm cov kav dej OCTG txuas ntxiv mus, tsav kev tsim kho tshiab hauv steel metallurgy thiab kev sib txuas tshuab.
Xaus
Kev paub yooj yim ntawm OCTG yeeb nkab suav nrog kev nkag siab txog nws qhov kev faib ua haujlwm, cov khoom muaj pes tsawg leeg, cov khoom siv kho tshuab, kev tsim khoom, thiab kev ua haujlwm nyuaj. Tsis zoo li cov pa roj carbon steel yeeb nkab, OCTG cov khoom raug tsim los ua haujlwm nyob rau hauv qhov chaw qis qis uas tsis ua haujlwm tsis yog qhov kev xaiv. Casing muab cov qauv kev ncaj ncees, tubing ua rau hydrocarbon ntau lawm, thiab laum yeeb nkab txhawb nqa kev ua haujlwm drilling. Los ntawm kev tswj xyuas metallurgy, precision manufacturing, thiab nruj ua raws li cov qauv, OCTG kav kom muaj kev nyab xeeb, kev ua tau zoo, thiab lub neej ntev ntawm cov roj thiab roj qhov dej thoob ntiaj teb.
