Kev xaiv cov khoom siv rau cov cuab yeej downhole yog cuam tshuam los ntawm ntau yam. Los ntawm qhov kev xav ntawm cov hom cuab yeej downhole:
Cov cuab yeej khawb av, cov cuab yeej txiav ntoo, thiabcov cuab yeej ua haujlwm: Cov cuab yeej no muaj lub neej ua haujlwm luv luv hauv qab qhov, yog li lawv xav tau lub zog siab tab sis muaj qhov yuav tsum tau tiv thaiv corrosion tsawg.
Cov cuab yeej ua tiav: Lawv yuav tsum ua haujlwm hauv qhov av tau ntau xyoo, yog li qhov kub thiab txias hauv qhov av thiab kev tiv thaiv xeb yuav tsum tau xav txog.
Los ntawm qhov kev xav ntawm cov chaw nyob hauv qhov av qis, lawv feem ntau raug faib ua plaub pawg:
Ib puag ncig tus qauv (tsis muaj hydrogen sulfide (H₂S), nrog cov pa roj carbon dioxide (CO₂) tsawg dua 1 psi [kwv yees li 0.0069 MPa]); Ib puag ncig xeb H₂S; Ib puag ncig xeb CO₂; Ib puag ncig xeb ua ke ntawm H₂S thiab CO₂.
Kev Xaiv Khoom Siv Rau Cov Cuab Yeej Downhole Hauv Cov Chaw Ib Puag Ncig Txheem
Rau cov cuab yeej downhole siv rau hauv cov chaw ib puag ncig tus qauv, cov hlau alloy xws li 4130, 4140, thiab 4145 (AISI qib) feem ntau raug xaiv. Cov tshuaj lom neeg sib xyaw thiab lub zog kho tshuab ntawm cov ntaub ntawv no tau qhia hauv cov lus hauv qab no:
1. Kev Sib Piv ntawm Cov Tshuaj Lom Zem (Feem Ntau)
| Khoom | 4130 (AISI) | 4140 (AISI) | 4145 (AISI 4145H) |
| Cov pa roj carbon (C) | 0.28-0.33% | 0.33-0.48% | 0.43-0.48% |
| Manganese (Mn) | 0.40-0.60% | 0.75-1.00% | 0.75-1.00% |
| Chromium (Cr) | 0.80-1.10% | 0.80-1.10% | 0.80-1.10% |
| Molybdenum (Mo) | 0.15-0.25% | 0.15-0.25% | 0.15-0.25% |
| Silicon (Si) | 0.15-0.35% | 0.15-0.35% | 0.15-0.35% |
| Sulfur (S)/Phosphorus (P) | ≤0.040% (S), ≤0.035% (P) | ≤0.030% (S), ≤0.030% (P) | ≤0.030% (S), ≤0.030% (P) |
2. Kev Sib Piv ntawm Lub Zog Mechanical
| Khoom Siv Kho Tshuab | 4130 | 4140 | 4145 (Qib H, Tus Nqi Ib Txwm Muaj) |
| Lub zog tensile | 760-871 MPa | 795-1000 MPa | 950-1100 MPa |
| Lub Zog Tawm | ≥635 MPa | ≥610-750 MPa | ≥750 MPa |
| Kev ntev | ≥17% | ≥22% | ≥10% |
| Qhov nyuaj (HRC) | 28-32 (tom qab quenching thiab tempering) | 28-34 (tom qab quenching thiab tempering) | 32-36 (tom qab quenching thiab tempering) |
Raws li pom tau los ntawm cov lus qhia:
Cov ntsiab lus carbon ntawm cov ntaub ntawv no nce ntxiv ua ntu zus (4130 < 4140 < 4145), thaum cov ntsiab lus ntawm lwm cov ntsiab lus zoo sib xws.
Cov khoom siv kho tshuab: Lub zog muaj feem cuam tshuam zoo nrog cov ntsiab lus carbon - 4145 muaj lub zog siab tshaj plaws - thaum lub zog txo qis rov qab, nrog 4130 muaj lub zog siab tshaj plaws.
4130, 4140, thiab 4145 yog cov khoom siv thoob ntiaj teb, thiab lawv cov khoom sib npaug hauv tebchaws Suav teb yog raws li nram no:
- 4130 (AISI) ≡ Qib hauv tsev 30CrMoA;
- 4140 (AISI) ≡ Qib hauv tsev 42CrMo;
- 4145H (AISI) ≡ Qib hauv tsev 45CrMo.
4130 thiab 4140 yog qhov tsim nyog rau cov cuab yeej ua tiav ib txwm muaj, nrog rau kev tsom mus rau kev siv nyiaj tsim nyog thiab kev vuam tau.
4145H feem ntau siv rau hauv qhov dej tob, cov cuab yeej siab, lossis cov cuab yeej thauj khoom siab (xws li cov cuab yeej drilling thiab cov cuab yeej workover), nrog rau qhov tseem ceeb rau lub zog thiab kev hnav tsis kam.
Kev Xaiv Khoom Siv Rau Cov Cuab Yeej Ua Kom Tiav Hauv Cov Chaw Uas Muaj Kev Kub Ntxhov
Rau cov cuab yeej ua tiav hauv cov chaw muaj corrosive, qhov kev xaiv feem ntau nyob ntawm qhov siab ib nrab ntawm cov pa roj acidic (muab faib ua ob hom: CO₂ thiab H₂S).
1. Cov Qhov Dej Uas Muaj Cov CO₂ Ntau
Yuav kom tiv taus CO₂ xeb, cov ntsiab lus chromium (Cr) hauv cov ntaub ntawv yuav tsum tau nce ntxiv. Cov ntaub ntawv hauv qab no (xaiv los ntawm cov ntsiab lus Cr) tuaj yeem npog cov qhov dej nrog CO₂ ib nrab siab xws li 0.5 MPa txog 14 MPa：3Cr (Cr cov ntsiab lus ≈ 3%), 9Cr1Mo (Cr cov ntsiab lus ≈ 9%), 13Cr, S13Cr, 17Cr (qib S17400), 22Cr (piv txwv li, duplex stainless hlau S32205), thiab 25Cr hlau.
2. Cov Qhov Dej Uas Muaj Cov H₂S Ntau
Yuav kom txo tau qhov kev tawg ntawm sulfide (SSC) xeb, cov ntsiab lus nickel (Ni) hauv cov ntaub ntawv yuav tsum tau nce ntxiv. Thaum lub siab ib nrab ntawm H₂S siab dua 1 MPa thiab lub siab ib nrab ntawm CO₂ kuj siab, cov hlau kub siab xws li cov hauv qab no yuav tsum tau siv:
Kev Xaiv Khoom Siv Rau Cov Cheebtsam Tshwj Xeeb
Cov ntaub ntawv tseem ceeb ntawm cov cuab yeej downhole (nyob rau hauv kev sib cuag nrog cov kua dej thiab cov khoom thauj): Xaiv raws li cov qauv saum toj no.
Cov Cheebtsam Txiav: Feem ntau yog ua los ntawm H62 tooj dag lossis S36600 stainless hlau tuav.
Cov khoom siv txuas: Xaiv los ntawm 20CrMoTi lossis 20CrMnTi. Txhawm rau txhim kho qhov tawv ntawm qhov chaw, kev kho mob carburizing ntawm qhov chaw (nrog rau cov txheej carburized tuab ntawm 0.8-1.2 hli), uas ua rau qhov tawv ntawm qhov chaw nce mus rau HRC 58-62.
Lwm Yam Uas Cuam Tshuam Rau Kev Xaiv Khoom Siv Thiab Cov Qauv Siv
Ntxiv rau cov pa roj acidic, kev xaiv cov khoom siv rau cov roj downhole casings thiab cov cuab yeej downhole kuj tseem muaj feem cuam tshuam nrog qhov kub ntawm downhole, dej txiav, mineralization degree, thiab pH tus nqi. Yog xav paub ntxiv txog kev xaiv, saib cov qauv kev lag luam Q/HS 14015 Design Guidelines for Corrosion Prevention of Tubing and Casing in Offshore Oil and Gas Wells.
Landrill kuj muab 41430, 4140, 4145 steel khoom bar.
Xav nug ntxiv.https://www.landrilloiltools.com/
Lub sijhawm tshaj tawm: Cuaj hlis-03-2025
5-1203, Dahua Industrial Zone, No.2 Yunshui Road, Hi-tech development zone, Xi'an, 710065, Suav teb
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