Technical Specification: API 5CT C90 API Tubing
1. Core Specification & Yam khoom
| Specification | Kev piav qhia |
|---|---|
| Kev tswj hwm tus qauv | API Specification 5CT- Casing thiab Tubing |
| Yam khoom | Tubing- Rau siab -siab, qhov dej tob |
| Qib Qib | C90- Siab- qib muaj zog nrog kev pabcuam qaub |
| Tshwj xeeb Feature | Kev tsim kho tshwj xeeb rau kev pabcuam qaub (H₂S ib puag ncig) |
2. Cov Khoom Siv Khoom & Cov Khoom Siv Tshuab
| Khoom | Requirement / Specification | Cov Lus Cim Tseem Ceeb |
|---|---|---|
| Yield zog | 90, 000 - 105,000 psi(621 - 724 MPa) | Nqaim 15 ksi range- tseem ceeb tswj |
| Tensile zog | Min . 105,000 psi (724 MPa) | |
| Yield-rau-Tensile Ratio | Qhov siab tshaj 0.85(rau txhua qhov ntau thiab tsawg) | Qhov tseem ceeb rau SSC tsis kam |
| Hardness txwv | Qhov siab tshaj plaws 25.4 HRC(Rockwell C) | Siab dua L80 (23 HRC) |
| Elongation | Min. raws li API cov qauv | Xyuas kom ductility |
| Kev kho cua sov | Quenched & Tempered (Q&T) | Yuav tsum tau rau tag nrho C90 |
3. Chemical Composition Requirements
API 5CT imposeskev tswj tshuaj nruj nrujrau C90 kom sib npaug zog thiab SSC tsis kam:
| Lub ntsiab | Qhov siab tshaj % | Kev xav |
|---|---|---|
| Cov pa roj carbon (C) | 0.35% | Sib npaug rau lub zog vs. SSC tsis kam |
| Manganese (Mn) | 1.40% | Tsawg dua ntau qib carbon steel |
| Phosphorus (P) | 0.020% | Tsawg heev rau kev txhim kho toughness |
| Sulfur (S) | 0.010% | Ultra{0}} qis kom txo qis SSC qhov chaw pib |
| Kev xaiv Alloying | Tswj Cr, Mo, Ni, V | Rau hardenability thiab tempering stability |
4. Sour Service Classification & Limitations
C90 muaj tshwj xeeb, tswj daim ntawv thov hauv qhov chaw qaub:
| Hom | Lub npe | H₂S Ib Feem Siab Siab Limit | Kub txwv | Sau ntawv |
|---|---|---|---|---|
| C90 Hom 1 | Sour Service | Mus txog0.3psi ua(2 kPa) | Tsawg dua los yog sib npaug175℃F(80 degree) | Standard qaub pab qib |
| C90 Hom 2 | Tsis yog-Qaub | Tsis tso cai | N/A | Tib yam chemistry/mechanics, tsis muaj SSC xeem |
| Kev txwv qhov tseem ceeb | Yield Tsawg dua lossis sib npaug rau 95,000 psihauv kev pabcuam qaub | Feem ntau yuam | Kev nyab xeeb ntxiv | Common operator specification |
5. Kev sib piv nrog Cov Qib Siab Zoo sib xws - Qib Siab
| Qib | Yield Ntau (psi) | Max Hardness | Sour Service Muaj peev xwm | Thawj Siv Case |
|---|---|---|---|---|
| C90 Hom 1 | 90,000 - 105,000 | 25.4 TSI | Yog lawm- nrog kev txwv | Cov dej qab zib xav tau 90 ksi |
| L80-1 | 80,000 - 95,000 | 23 HRC | Zoo heev (tsis muaj pₕ₂ₛ txwv tsawg dua lossis sib npaug li 23 HRC) | Standard qaub kev pab cuam |
| T95Type 1 | 95,000 - 110,000 | 25.4 TSI | Yog - txwv ntau dua C90 | Ultra- tob, siab zog xav tau |
| N80 | Tsawg kawg . 80,000 | 23 HRC | Cov xwm txheej (yog tias Tsawg dua lossis sib npaug rau 23 HRC) | Tsis yog - kev pabcuam qaub tseem ceeb |
| P110 | Tsawg kawg . 110,000 | Tsis tau teev tseg | Tsis tso caihauv kev pabcuam qaub | Sib sib zog nqus, tsis yog - qhov dej qaub xwb |
6. Kev tswj cov txheej txheem tsim khoom
Kev tsim khoom tseem ceeb tshwj xeeb rau C90:
Quenching & Tempering:Yuav tsum tau tswj qhov kub thiab txias
Yield Strength Targeting:Feem ntau ua rau90-95 hlirau kev pabcuam qaub, txawm tias tso cai txog li 105 ksi
Hardness Uniformity:Tag nrho - yuav tsum tau kuaj xyuas lub cev tawv
Traceability:Tag nrho cov cua sov / ntau traceability nrog cov ntaub ntawv xeem
7. Daim ntawv thov & tsim kev txiav txim siab
| Daim ntawv thov | Vim li cas C90 thiaj xaiv | Yam Zoo Parameters |
|---|---|---|
| Deep Sour Gas Wells | Lub zog siab dua L80 rau qhov tob / siab | 12,000-18,000 ft, H₂S tam sim no |
| Siab -Siab Sour Wells | 90 ksi tsim tso cai rau cov phab ntsa nyias | >8,000 psi lub taub hau siab |
| Sour Service nrog CO₂ | Balanced corrosion / SSC tsis kam | H₂S + CO₂, nruab nrab kub |
| Cov hlua ua haujlwm hauv Sour Wells | Lub zog loj rau kev ua haujlwm ua haujlwm | Ib ntus raug rau H₂S |
Tsim Qhov Zoo:
Siab zogtshaj L80 (90 vs . 80 ksi yam tsawg kawg nkaus)
Tswj hardnessmus txog 25.4 HRC (vs . 23 rau L80)
Validated SSC kujthaum tsim nyog / tsim
8. Cov kev txwv & kev pheej hmoo tseem ceeb
| Risk Factor | Paub meej & Mitigation |
|---|---|
| Yield Strength Upper Limit | Risk:Tawm> 95 ksi nce SSC susceptibility Kev txo qis:Qhia meej "C90 nrog cov txiaj ntsig tsawg dua lossis sib npaug rau 95,000 psi" rau kev pabcuam qaub |
| Kub hauv H₂S | Risk:SSC kev pheej hmoo nce siab tshaj 175℃F (80 degree) Kev txo qis:Kev ntsuas kub, tuaj yeem txo qis rau L80 |
| Chlorides nrog H₂S | Risk:Chlorides exacerbate SSC Kev txo qis:Tswj cov ntsiab lus chloride, inhibition |
| Vuam / Kho | Risk:HAZ hardness> 25.4 HRC Kev txo qis:PWHT, tsim nyog cov txheej txheem vuam |
| Kev siv tsis raug | Risk:Siv C90 Hom 2 hauv kev pabcuam qaub Kev txo qis:Nthuav cov khoom specifications |
9. Ordering & Quality Assurance
Qhov tseem ceeb kom qhia meej rau Sour Service:
Hom: C90 Hom 1(qhia meej rau kev pabcuam qaub)
Kev Xav Tau Ntxiv S:Kev xeem SSC rau NACE TM0177 Txoj Kev A
Yield Strength txwv:Feem ntau "Yield zog tsis pub tshaj 95,000 psi"
Hardness yuav tsum tau:"Ntau tshaj 25.4 HRC, ib txwm tsom 23-24 HRC"
Ntawv pov thawj:EN10204 3.2 nrog cov ntawv qhia txog kev taug qab thiab cov ntawv xeem
Kev sib txuas:Tau tshaj SSC cov cai (kev sib txuas zoo tshaj plaws)
Kev Xeem Xeem:
Full SSC Test Suite:Txoj Kev A (tensile), tej zaum Txoj Kev D (DCB)
Kev Tshawb Fawb Hardness:Longitudinal thiab transverse
Charpy Impact:Feem ntau teev rau qis -kev pabcuam kub
Tag nrho -NDT:UT / MPI rau kev kuaj pom qhov tsis xws luag
10. Kev Lag Luam Pom Zoo & Kev Ntsuas Tus Nqi
| Yam | C90 vs L80 | C90 vs T95/P110 |
|---|---|---|
| Lub zog Advantage | +12.5% siab dua qhov qis tshaj tawm | -10% vs. T95, -18% vs. P110 |
| Sour Service | Kev txwv ntau dua (0.3 psi H₂S max) | Cov kev txwv zoo sib xws rau T95 |
| Tus nqi hwm | 15-25% dhau L80 | 5-10% tsawg dua T95 |
| Muaj | Muaj dav | Tsawg tshaj li L80 |
| Tsim Flexibility | Lub zog siab dua tso cai rau cov phab ntsa nyias nyias | Tsawg dua cov qib siab |
Qhov tseem ceeb Technical Insight:
C90 tuav lub niche tseem ceeb- nws muab10 ksi ntau zog dua L80thaum khaws ciaqaub kev pab cuam muaj peev xwm, tab sis nrognruj dua ib puag ncig kev txwvua l80. Covsiab dua pub hardness (25.4 vs . 23 HRC)lees paub tias ua tiav 90 ksi yield feem ntau yuav tsum muaj zog dua me ntsis, tab sis qhov no los nrog kev lag luam - tawm ntawmtxo H₂S ib nrab siab kam rau ua (0.3 psi max).
Qhov "90-95 ksi yield target" yog kev lag luam zoo tshaj plawsrau cov kev pabcuam qaub C90, txawm tias API pub nyiaj mus txog 105 ksi. Qhov no muab cov txiaj ntsig muaj zog tshaj L80 thaum tswj hwm SSC txaus.
Thaum Yuav Qhia C90:
Thaum zoo tsim yuav tsum tau>80 ksi yield zogtab sis Tsawg dua lossis sib npaug li 95 ksi txaus
Thaum twgH₂S tam sim no tab sis txwv(tsawg dua los yog sib npaug rau 0.3 psi ib nrab siab)
Thaum kub kubnruab nrab(tsawg dua lossis sib npaug li 175℃F / 80℃hauv H₂S)
Thaum twglifecycle nqinyiam dua - cov ntaub ntawv muaj zog dua li cov phab ntsa tuab L80
Tshwj xeeb muaj nqis nyob rau hauvsib sib zog nqus, siab - siab qaub qhov dejqhov twg qhov hnyav / nqi txuag ntawm cov phab ntsa nyias yog qhov tseem ceeb
Kev ceeb toom tseem ceeb:C90 Hom 2 muaj nyob - xyuas kom meejHom 1tau teev tseg rau txhua daim ntawv thov kev pabcuam qaub, thiab xav txog kev txwv kev txwv lub zog ntxiv (max 95 ksi) rau kev txhim kho kev nyab xeeb.
