Roj Lub Tebchaws Tubular Cov Khoom Muag, feem ntau hu ua OCTG, xa mus rau tsev neeg ntawm cov khoom siv steel tubular siv hauv kev tshawb nrhiav thiab tsim cov roj thiab cov nkev. OCTG muaj xws li casing, tubing, thiab laum yeeb nkab, tag nrho cov uas ua hauj lwm nyob rau hauv xav tau subsurface ib puag ncig yam ntxwv los ntawm kev kub siab, siab kub, corrosive kua, thiab complex mechanical loads. Kev ua tau zoo ntawm OCTG cov khoom yog nyob ntawm kev xaiv cov khoom siv. Kev nkag siab txog OCTG yeeb nkab cov ntaub ntawv yuav tsum tau tshuaj xyuas cov qib steel, txheej txheem kev kho cua sov, cov khoom siv kho tshuab, thiab tiv thaiv corrosion thiab tawg. Tsis zoo li cov pa roj carbon steel yeeb nkab siv hauv cov ntawv thov saum npoo, OCTG cov ntaub ntawv tau tsim tshwj xeeb rau cov kev pab cuam downhole.
Kev faib tawm ntawm OCTG Cov Khoom Siv thiab Cov Khoom Siv
Casing thiab nws cov qauv muaj nuj nqi
Casing yeeb nkab yog ntsia rau hauv lub qhov dej kom stabilize lub qhov drilled thiab cais subsurface formations. Nws tiv thaiv kev tawg ntawm phab ntsa hauv qhov dej thiab tiv thaiv thaj chaw dej tshiab los ntawm kev sib kis. Vim hais tias casing yog cemented nyob rau hauv qhov chaw, nws yuav tsum tiv thaiv sab nraud los ntawm ib puag ncig formations nrog rau sab hauv siab los ntawm cov kua ntau lawm. Cov khoom siv yuav tsum muaj lub zog txaus los tiv thaiv kev tawg thiab tawg tsis ua haujlwm.
Tubing thiab ntau lawm yuav tsum tau
Tubing ua haujlwm raws li cov kav dej uas cov hydrocarbons ntws los ntawm lub reservoir mus rau saum npoo. Tsis zoo li casing, tubing feem ntau tshem tau thiab yuav raug hloov thaum lub sij hawm lub qhov dej. Cov khoom siv tubing yuav tsum tiv thaiv sab hauv siab, corrosion los ntawm cov kua ua kua, thiab cov neeg kho tshuab hnav. Kev xaiv cov khoom siv rau tubing yog zoo sib xws rau reservoir chemistry thiab kub ntau lawm.
Drill Pipe thiab Mechanical Loading
Cov yeeb nkab laum yog siv thaum lub sijhawm ua haujlwm drilling los xa cov torque thiab axial load los ntawm qhov drilling rig mus rau lub laum me ntsis. Nws muaj kev thauj khoom cyclic, khoov, thiab torsion. Yog li ntawd, cov khoom siv tho yeeb nkab yuav tsum muaj zog tiv taus thiab toughness, nrog rau muaj zog weld kev ncaj ncees ntawm cov cuab yeej pob qij txha.
Carbon Steel Qib hauv OCTG Daim Ntawv Thov
API 5CT Material Standards
Cov ntsiab lus tseem ceeb tswj hwm OCTG cov ntaub ntawv yog API 5CT, uas txhais cov tshuaj muaj pes tsawg leeg, cov khoom siv hluav taws xob, kev kho cua sov, thiab cov kev xeem. Cov pa roj carbon steel qib xws li H40, J55, K55, N80, L80, C90, T95, thiab P110 yog dav siv nyob ntawm qhov tob thiab qhov siab.
Cov qib qis xws li H40 thiab J55 feem ntau yog siv rau hauv qhov dej ntiav nrog lub siab nruab nrab. Raws li qhov tob thiab kev tsim siab nce, qib siab zog xws li N80 thiab P110 ua qhov tsim nyog. Cov qhab-nees feem ntau sib raug rau qhov tsawg kawg nkaus tawm lub zog hais tawm hauv ntau txhiab psi.
Cov lus hauv qab no qhia txog tus neeg sawv cev API 5CT carbon steel qib thiab lawv cov yam ntxwv ntawm kev siv tshuab.
| Qib | Yam tsawg kawg nkaus tawm lub zog (MPa) | Yam tsawg kawg Tensile Strength (MPa) | Hom Daim Ntawv Thov Qhov tob |
|---|---|---|---|
| H40 | 276 | 414 | Qhov dej ntiav |
| J55 | 379 | 517 | Tsawg mus rau nruab nrab qhov tob |
| N80 | 552 | 689 | Nruab nrab qhov tob |
| L80 | 552 | 655 | Corrosive ib puag ncig |
| P110 | 758 | 862 | Sib sib zog nqus siab - qhov dej siab |
Cov qhab nia no qhia tau hais tias qhov kev txhawb zog txhawb nqa tob dua thiab nyuaj dua li cas.
Kev kho cua sov thiab Microstructure
Kev kho cua sov ua lub luag haujlwm tseem ceeb hauv kev ua tiav qhov kev xav tau ntawm kev siv tshuab. Cov txheej txheem xws li quenching thiab tempering refine microstructure ntawm carbon steel, txhim khu lub zog thaum tuav kom txaus toughness. Kev tswj cov cua txias feem ntau cuam tshuam cov qoob loo loj thiab theem kev faib tawm, cuam tshuam ncaj qha rau kev tiv thaiv tawg tawg.
Rau cov kev pabcuam qaub qhov dej uas muaj hydrogen sulfide, cov ntaub ntawv yuav tsum ua kom tau raws li qhov xav tau ntxiv los tiv thaiv sulfide kev ntxhov siab tawg. Kev kho cua sov tshwj xeeb thiab kev tswj xyuas muaj pes tsawg leeg tau ua kom ua raws li cov qauv kev pabcuam qaub.
Alloyed OCTG Cov Khoom Siv rau Ib puag ncig hnyav
Corrosion{0}}Resistant Alloys
Hauv cov dej uas muaj cov pa roj carbon dioxide siab lossis hydrogen sulfide cov ntsiab lus, cov qauv carbon steel yuav tsis muaj kev tiv thaiv corrosion txaus. Corrosion-resistant alloys xws li chromium-muaj steels los yog npib tsib xee-raws li alloys yog ua hauj lwm nyob rau hauv cov rooj plaub no. Cov ntaub ntawv no muaj kev txhim kho tsis zoo rau pitting, kev nyuaj siab corrosion cracking, thiab dav corrosion.
Txawm hais tias cov khoom siv alloy ua rau tus nqi nce ntxiv, lawv tuaj yeem txo qhov ntev -cov nqi tu thiab sijhawm ua haujlwm. Cov txheej txheem xaiv suav nrog ntsuas cov khoom siv hluav taws xob, qhov kub thiab txias, thiab kev cia siab rau lub neej.
Mechanical thiab Environmental Balance
Kev xaiv cov khoom siv hauv OCTG yeej ib txwm muaj qhov sib npaug ntawm cov neeg kho tshuab lub zog thiab kev tiv thaiv ib puag ncig. Cov hlau muaj zog dua tuaj yeem ua rau muaj kev cuam tshuam ntau dua rau qee qhov kev sib tsoo yog tias tsis tswj tau zoo. Yog li ntawd, cov qauv kev qhia tshwj xeeb feem ntau txwv cov hardness thiab txhais cov txheej txheem nruj nruj kom ntseeg tau tias muaj kev ntseeg siab.
Cov lus hauv qab no sib piv cov pa roj carbon steel OCTG nrog cov kev hloov pauv ntawm kev ua haujlwm ntawm cov yam ntxwv.
| Hom khoom | Qib Siab | Corrosion Resistance | Tus Nqi Theem | Hom kev siv |
|---|---|---|---|---|
| Carbon hlau (J55 / N80) | Nruab nrab mus rau siab | Txwv tsis pub | Tsawg rau Nruab Nrab | Txheem qhov dej |
| Sour Service Steel (L80) | Nruab nrab | Txhim kho | Nruab nrab | H2S ib puag ncig |
| 13Cr alloy hlau | Siab | Siab CO2 tsis kam | Siab | Corrosive qhov dej |
| Nickel{0}}Based Alloy | Siab heev | Zoo heev | Siab heev | Cov mob hnyav heev |
Qhov kev sib piv no qhia txog yuav ua li cas kev hloov kho cov khoom siv sib haum mus rau kev ua haujlwm hnyav zuj zus.
Mechanical Testing thiab Quality Assurance
Tsis yog -Kev kuaj thiab tshuaj xyuas puas tsuaj
Cov ntaub ntawv OCTG tau dhau los ua qhov kev sim dav dav ua ntej xa mus rau thaj chaw. Tsis yog-kev kuaj kev puas tsuaj xws li kev tshuaj ntsuam xyuas ultrasonic thiab electromagnetic kuaj xyuas cov phab ntsa thickness uniformity thiab kuaj pom qhov tsis xws luag. Kev ntsuam xyuas tshuab suav nrog kev ntsuas tensile, ntsuas hardness, thiab kev ntsuam xyuas cuam tshuam kom paub meej tias ua raws li cov kev cai tshwj xeeb.
Threaded kev twb kev txuas tseem yuav tsum tau machining thiab tshuaj xyuas kom paub tseeb tias cov xau- nruj kev ua haujlwm nyob rau hauv siab. Kev sib txuas ncaj ncees yog qhov tseem ceeb vim tias tsis ua haujlwm ntawm cov pob qij txha tuaj yeem cuam tshuam kev tswj kom zoo.
Traceability thiab Certification
Cov khoom siv traceability yog qhov tseem ceeb hauv kev tsim OCTG. Txhua lub yeeb nkab yog cim nrog qib, tus naj npawb cua sov, thiab cov ntsiab lus tshwj xeeb. Cov ntaub ntawv pov thawj txheeb xyuas cov tshuaj muaj pes tsawg leeg thiab cov khoom siv kho tshuab. Qhov no traceability ua kom muaj kev lav phib xaub thiab txhawb kev tswj xyuas kom zoo thoob plaws hauv cov khoom siv.
Xaus
OCTG yeeb nkab cov ntaub ntawv tsim cov caj qaum ntawm cov roj thiab roj zoo tsim thiab tsim khoom. Los ntawm cov qauv carbon steel qib siv nyob rau hauv qhov dej ntiav mus rau cov khoom siv alloy siab heev rau corrosive thiab siab - ib puag ncig siab, kev xaiv cov khoom txiav txim siab txog kev ncaj ncees, kev nyab xeeb, thiab kev ua haujlwm zoo.
Kev nkag siab txog kev faib tawm lub zog, cov txheej txheem kho cua sov, cov kev xav tau ntawm kev tiv thaiv corrosion, thiab cov qauv tshuaj xyuas muab kev pom zoo ntawm OCTG cov khoom siv engineering. Raws li kev tshawb nrhiav txav mus rau hauv qhov tob dua thiab nyuaj dua, kev txhim kho thiab kev ua kom zoo ntawm OCTG cov ntaub ntawv yuav txuas ntxiv mus ua lub luag haujlwm txiav txim siab hauv kev tsim hluav taws xob thiab kev nyab xeeb.
