Roj Lub Tebchaws Tubular Khoom (OCTG) yog qhov tseem ceeb rau kev drilling thiab ua tiav cov roj thiab roj qhov dej, thiab kev xaiv cov qib carbon steel ncaj qha txiav txim siab zoo, kev nyab xeeb ntawm kev ua haujlwm, thiab kev lag luam hauv qhov project. Vim tias OCTG cov kav dej ua haujlwm nyob rau hauv kev sib xyaw ua ke ntawm lub siab sab hauv, sab nraud lub cev qhuav dej, axial nro, thermal cycling, thiab corrosive raug, cov khoom xaiv tsis tuaj yeem cia siab rau qhov tseem ceeb ntawm lub zog. Hloov chaw, engineers yuav tsum ntsuas cov qib carbon steel raws li kev ua haujlwm ntawm kev ua haujlwm, ib puag ncig kev sib raug zoo, kev tsim khoom, thiab kev siv lub neej. Kev nkag siab txog cov qib sib txawv li cas nyob rau hauv kev tsim qauv zoo yog qhov tseem ceeb rau kev xaiv cov khoom zoo.
Txheej txheem cej luam ntawm Carbon Steel Qib rau OCTG
Lub zog-Raws li kev faib tawm
Cov qib carbon steel OCTG feem ntau yog cais raws li qhov tsawg kawg nkaus lub zog, raws li tau hais los ntawm cov qauv xws li API 5CT. Lub zog tawm los sawv cev rau qhov kev ntxhov siab uas pib deformation mus tas li thiab txuas ncaj qha rau kev tawg thiab tawg tsis kam. Cov qib qis xws li J55 thiab K55 yog qhov tsim nyog rau cov qhov dej ntiav uas muaj qhov nruab nrab siab. Cov qib nruab nrab zoo li N80 muab kev txhawb zog rau cov qhov dej tob. Cov qib siab dua xws li P110 thiab Q125 yog tsim los rau siab -siab thiab tob drilling ib puag ncig.
Txawm hais tias lub zog muaj zog ntau dua tuaj yeem txhim kho lub peev xwm thauj khoom, nws tuaj yeem txo cov ductility thiab toughness yog tias tsis tswj tau zoo los ntawm kev kho cua sov. Yog li ntawd, kev xaiv qib yuav tsum sib npaug ntawm lub zog thiab tawg tsis kam.
Kev txiav txim siab ntawm metallurgical
Cov pa roj carbon steel siv hauv OCTG feem ntau muaj cov qib tswj cov pa roj carbon thiab manganese, nrog cov impurities tsawg xws li sulfur thiab phosphorus. Cov pa roj carbon ntau ntxiv txhim kho lub zog tab sis tuaj yeem txo qhov weldability thiab nce hardness. Txhawm rau ua tiav cov qib siab dua yam tsis muaj qhov brittleness ntau dhau, cov neeg tsim khoom cia siab rau cov txheej txheem quenching thiab tempering los kho cov microstructure rau hauv tempered martensite.
Kev kho cua sov zoo sib xws yog qhov tseem ceeb vim tias cov khoom siv kho tshuab yuav tsum zoo ib yam ntawm tag nrho cov yeeb nkab lub cev thiab cov xov sib txuas. Kev kho cua sov tsis zoo tuaj yeem tsim cov kev hloov pauv nyuaj uas ua rau muaj kev cuam tshuam rau sulfide kev ntxhov siab tawg hauv qhov chaw qaub.
Cov lus hauv qab no qhia txog cov qib carbon steel thiab lawv qhov chaw kho tshuab.
| API Qib | Yam tsawg kawg nkaus tawm lub zog (MPa) | Hom Daim Ntawv Thov Qhov tob | Kev kho cua sov | General Use Scenario |
|---|---|---|---|---|
| J55 | 379 | Qhov dej ntiav | Li qub | Nto casing |
| K55 | 379 | Nyias mus rau nruab nrab | Li qub | General casing |
| N80 | 552 | Nruab nrab- qhov tob tob | Normalized los yog Q&T | Intermediate casing |
| L80 | 552 | Nruab nrab mus tob | Quenched & Tempered | Lub qhov dej ua kua qaub |
| P110 | 758 | Sib sib zog nqus siab - qhov dej siab | Quenched & Tempered | Production casing |
| Q125 | 862 | Ultra- qhov dej tob | Quenched & Tempered | Siab - ib puag ncig kev nyuaj siab |
Qhov kev faib tawm no qhia txog kev nce qib ntawm lub zog thiab qhov sib txuas ntxiv hauv kev siv qhov hnyav.
Cov ntsiab lus tseem ceeb hauv kev xaiv cov khoom
Zoo Qhov tob thiab qhov siab
Raws li qhov tob nce, tsim siab thiab axial loads nce ntau. Cov qib carbon steel uas tau xaiv yuav tsum muaj kev tawg txaus kom muaj cov kua dej hauv lub siab thiab lub cev tsis muaj zog tiv thaiv kev tsim tawm sab nraud. Cov qib siab dua xws li P110 feem ntau xaiv rau cov qhov dej sib sib zog nqus vim tias lawv cov txiaj ntsig zoo dua.
Txawm li cas los xij, xaiv cov qib siab tshaj plaws tsis yog ib txwm zoo. Tshaj - specifications nce nqi thiab tej zaum yuav qhia tsis tsim nyog brittleness. Cov kws kho tsheb yuav tsum suav cov teeb meem thauj khoom, suav nrog cov yam ntxwv ntawm kev nyab xeeb, txhawm rau txiav txim siab yam tsawg kawg nkaus xav tau qib.
Environmental Exposure thiab Sour Service
Cov dej uas muaj hydrogen sulfide yuav tsum tau saib xyuas tshwj xeeb. H₂S tuaj yeem ua rau muaj kev ntxhov siab sulfide tawg hauv siab -cov hlau tawv tawv. Rau cov xwm txheej zoo li no, qib xws li L80 yog tsim los nrog kev tswj xyuas qhov nyuaj kom txo tau qhov kev pheej hmoo tawg. Kev sim hardness yog qhov yuav tsum tau ua kom paub tseeb tias kev ua raws cai.
Cov pa roj carbon dioxide corrosion yog lwm yam cuam tshuam rau kev xaiv cov khoom. Txawm hais tias cov pa roj carbon steel tuaj yeem tiv taus qhov kub ntawm CO₂ ib puag ncig, tus nqi corrosion ntau dua yuav xav tau cov tshuaj tiv thaiv corrosion los yog lwm yam khoom siv.
Kev kub ntxhov
Downhole kub cuam tshuam rau txhua yam kev ua haujlwm. Qhov kub thiab txias tuaj yeem txo qhov muaj zog tawm los, thaum qhov kub qis ua rau muaj kev pheej hmoo ntawm kev tawg tawg. Impact toughness testing ua kom muaj kev puas tsuaj txaus ntawm qhov kub thiab txias. Thaum tshav kub kub- cov qib kho yuav tsum tuav ob qho tib si lub zog thiab lub zog ntawm qhov ua haujlwm kub.
Cov lus hauv qab no qhia txog qhov ua haujlwm ua haujlwm cuam tshuam li cas rau kev xaiv qib.
| Kev ua haujlwm Factor | Kev cuam tshuam rau cov khoom siv | Kev xaiv xaiv | Hom Qib Xaiv |
|---|---|---|---|
| Kev kub siab sab hauv | Kev ntxhov siab ntau ntxiv | Yuav tsum muaj zog tawm los ntau dua | P110, Q125 |
| Siab sab nraud | Tuav txoj kev pheej hmoo | Tswj phab ntsa thickness thiab lub zog | N80, P110 |
| Sour Environment (H₂S) | Kev pheej hmoo ntawm kev tawg | Hardness txwv | L80 |
| Kub kub | Kev txo qis zog | Thaum tshav kub kub- qib kho | P110 |
| Nruab Nrab Qhov Zoo | Txo kev ntxhov siab | Tus nqi - kev xaiv zoo | J55, K55 |
Qhov kev sib piv no qhia txog qhov kev ntsuas ib puag ncig thiab kev siv tshuab ua rau kev txiav txim siab xaiv qib.
Ntsuas kev ua tau zoo thiab tus nqi
Kev xaiv cov khoom siv hauv OCTG tsim yog qhov tseem ceeb ntawm tus nqi - kev ua tau zoo ntawm kev ua haujlwm. Thaum cov qib siab dua muaj kev txhim kho kev siv tshuab, lawv kuj koom nrog cov nqi raw khoom ntau dua, kev kho cua sov ntau dua, thiab kev soj ntsuam nruj dua. Rau cov qhov dej ntiav lossis nruab nrab, kev siv qib siab - cov qhab nia muaj zog yuav tsis muab kev pom zoo rau kev lag luam.
Kev txheeb xyuas tus nqi lifecycle txiav txim siab tsis yog tsuas yog cov nuj nqis pib tab sis kuj tseem muaj kev saib xyuas, kev ua haujlwm muaj peev xwm, thiab kev pheej hmoo tsis ua haujlwm. Ib qho zoo- tsim cov tswv yim xaiv cov khoom siv txo qis tag nrho cov nqi thaum tswj kev nyab xeeb.
Quality Assurance and Compliance
Cov qib carbon steel OCTG yuav tsum ua raws li cov qauv thoob ntiaj teb los xyuas kom meej qhov sib xws thiab kev ntseeg tau. Kev ntsuas tshuab suav nrog kev ntsuas tensile, ntsuas qhov cuam tshuam, ntsuas qhov tawv, thiab ntsuas ntsuas dej siab. Tsis yog-kev kuaj kev puas tsuaj xws li kev tshuaj xyuas ultrasonic ua kom muaj suab nrov sab hauv.
Cov ntaub ntawv qhia txog kev taug qab txuas txhua cov yeeb nkab rau nws cov xov tooj cua sov, tshuaj muaj pes tsawg leeg, thiab cov ntaub ntawv kho cua sov. Qhov kev taug qab no yog qhov tseem ceeb rau kev ua haujlwm siab - qhov kev pheej hmoo drilling uas cov khoom tsis ua haujlwm tuaj yeem ua rau muaj kev cuam tshuam loj rau kev lag luam thiab ib puag ncig.
Xaus
Cov qib carbon steel thiab xaiv cov khoom siv rau OCTG yog txiav txim siab los ntawm kev sib xyaw ua ke ntawm cov kev xav tau ntawm cov tshuab, ib puag ncig raug, qhov kub thiab txias, thiab kev xav txog nyiaj txiag. Los ntawm J55 rau cov ntawv thov ntiav mus rau Q125 rau ultra- qhov dej tob, txhua qib sawv cev rau kev ua tib zoo ua kom zoo sib npaug ntawm cov khoom muaj zog, ductility, hardness tswj, thiab toughness. Kev xaiv cov khoom siv tau zoo yuav tsum tau muab cov lus qhia ntxaws ntxaws, kev txheeb xyuas corrosion, thiab ua raws li cov txheej txheem kev xeem. Los ntawm kev ua raws cov qib carbon steel cov yam ntxwv nrog cov xwm txheej tshwj xeeb, cov neeg ua haujlwm tuaj yeem ua kom muaj kev ncaj ncees ntawm cov qauv, kev ntseeg tau ntawm kev ua haujlwm, thiab ntev -cov nqi siv hluav taws xob hauv kev tshawb nrhiav roj thiab roj.
