API 5CT C95 yog qhov siab- lub zog casing qib txiav txim siab los ntawm American petroleum lub koom haum (API) tshwj xeeb 5ct. Nws yog thawj tsim los siv rau hauvQaub Muab Kev Pab Cuam TshuamQhov twg kuj tsis kam rau sulfide kev ntxhov siab tawg (SSC) yuav tsum muaj.
Cov yam ntxwv tseem ceeb:C95 yog aTxwv tsis pub tawm los ua haujlwm qib siab, txhais tau nws cov txiaj ntsig lub zog yog qhov nqaim thiab nws lub hardness yog tswj tau kom txhim kho nws cov kev ua tau zoo hauv cov dej thiab hydrogen sulfide (h₂s).
Piv:Nws muaj lub zog siab dua li cov qhab nia L80 thaum muab cov txiaj ntsig zoo dua li qhov kev pab cuam P110, uas tsis yog ib qho kev pom zoo rau cov kev pabcuam siur.
Hom:Tsis pub dhau ntawm C95 cov lus qhia tshwj xeeb, muaj ntau hom (piv txwv li, hom 1) uas tej zaum yuav muaj variations hauv kev kho tshuaj lom neeg thiab kev kho cua sov kom ua tiav cov khoom uas xav tau.
1. Cov Cuab Yeej Siv Khoom Siv Hluav Taws Xob
Cov lus hauv qab no qhia txog cov cuab yeej tseem ceeb xws li API 5ct.
| Ntiag tug | Tus Nqi & Xav Tau | Sau ntawv |
|---|---|---|
| Qib kev tsim | C95 | - |
| Teev cov txiaj ntsig tsawg kawg nkaus zog (smys) | 95,000 psi (655 mpa) | Kev ntxhov siab uas cov yeeb nkab pib deform plastically. |
| Yam tsawg kawg tensile lub zog | 105,000 psi (724 MPA) | - |
| Qhov Tshaj Tawm Los Muaj Zog | 110,000 psi (758 MPa) rau od tsawg dua lossis sib npaug rau 4.5 " | NoTxwv tsis pub tawm los muaj zog muaj zog(95-110 ksi) yog qhov tseem ceeb rau SSC tsis kam. |
| 115,000 psi (793 mpa) rau OD> 4.5 " | ||
| Siab kawg nkaus | HRC 25.4 | Qhov no yog ib qho kev tswj hwm tseem ceeb rau cov kev pabcuam kev pabcuam. |
| Elongation | As peri 5ct mis | Yam tsawg kawg nkaus elongation nyob ntawm qhov hnoos qeev thiab qib kawm. |
2. Tshuaj lom neeg ua haujlwm
Cov tshuaj lom neeg tshuaj lom yog tswj tau kom ntseeg tau tias qhov xav tau cov khoom siv thiab SSC tsis kam. Hauv qab no yog cov feem pua ntau tshaj plaws ntawm feem pua, nrog rau qhov muaj tseeb nyob ntawm kev tsim khoom thiab hom.
| Lub ntsiab | Qhov ntau tshaj% (qhov hnyav) | Cawmsab & cuam tshuam |
|---|---|---|
| Carbon (c) | 0.35 - 0.45 % | Ua kom muaj zog zog thiab hardness. |
| Manganese (mn) | 1.50 % | Ua kom muaj zog zog thiab ua tsis tau. |
| Molybdenum (mo) | 0.40 - 0.70 % | Tseem txhim kho lub zog thiab SSC tiv taus. |
| Chromium (cr) | 0.90 - 1.30 % | Txhim kho corrosion tsis kam thiab lub zog. |
| Sulphur (s) | 0.010 % | Cov qib qis yog qhov yuav tsum tau ua kom txo qis kev ntxim nyiam rau SSC. |
| Phosphorus (p) | 0.020 % | Cov qib qis txhim kho kev nruj thiab SSC tsis kam. |
Nco tseg:Qhov muaj pes tsawg leeg rau C95 hom 1 feem ntau yog ib qho Crucion- mo hlau, zoo ib yam li AISI 4130/4140 hloov kho rau cov kev pabcuam siv.
3. Qhov seem thiab cov ntaub ntawv loj (piv txwv rau qhov ntau thiab tsawg)
Cov lus hauv qab no muab cov piv txwv rau qhov ntau thiab tsawg. Tag nrho cov ntau thiab tsawg yog teev nyob rau hauv API 5ct.
| Sab nraud ntawm lub taub (od) | Hnyav (nominal) | Phab Ntsa Thickness (Nominal) | Drift inch (min.) | ||||
|---|---|---|---|---|---|---|---|
| hauv | lub hli | lb / ft | kg / m | hauv | lub hli | hauv | lub hli |
| 7 | 177.8 | 26.00 | 38.69 | 0.362 | 9.19 | 6.151 | 156.23 |
| 7 | 177.8 | 29.00 | 43.15 | 0.408 | 10.36 | 6.094 | 154.79 |
| 7 | 177.8 | 32.00 | 47.62 | 0.453 | 11.51 | 6.035 | 153.29 |
| 9 5/8 | 244.5 | 40.00 | 59.53 | 0.395 | 10.03 | 8.681 | 220.50 |
| 9 5/8 | 244.5 | 47.00 | 69.94 | 0.472 | 11.99 | 8.535 | 216.79 |
| 9 5/8 | 244.5 | 53.50 | 79.63 | 0.545 | 13.84 | 8.397 | 213.28 |
Nyhav:Nominal linear hnyav. Qhov hnyav tiag tiag muaj qhov ua kom muaj kev tiv thaiv (feem ntau -3.5% rau +6.5%).
Drift inch:Qhov tsawg kawg ntawm txoj kab ntawm ib qho cylindrical manrel uas yuav tsum dhau dawb los ntawm cov yeeb nkab. Ua kom pom tseeb sib xyaw nrog cov cuab yeej downhole.
4. Cov ntaub ntawv ua tau zoo (piv txwv suav)
Cov ntaub ntawv ua yeeb yam xws li vau thiab tawg tau qhab nia raws li qhov tshwj xeeb thiab cov khoom siv neeg kho mob. Cov hauv qab no yogKwv yees qhov tseem ceebrau 7 ", 29 lb / ft C95 cas.
| Cov Khoom Muaj Peev Xwm | Kwv yees tus nqi | Mob / Mis |
|---|---|---|
| Sab hauv cov txiaj ntsig siab (tawg) | ~ 10,900 psi | Xam siv Barlow tus qauv mis: P=2} * smys * t / od |
| Vau | ~ 8,500 psi | Sib txawv heev nrog d / t piv; Qhov no yog rau kom tau txais lub zog. |
| Yeeb Nkab Lub Cev Sawv Cev Zog | ~ 1.12 lab lbf | F=smys * hla - ntu ntu |
Tseem Ceeb:Cov no yog cov lus qhia tseem ceeb. Rau cov kws tsim qauv tsim, ib txwm siv cov qauv zoo muab rau hauv cov khw muag khoom cov ntawv pov thawj zeb los yog suav siv kev lag luam mill formulas (api tr 5c3).
Cov Ntawv Qhia Tseem Ceeb
Sour roj wirs:Ntau lawm ntau lawm cuab thiab Interliiat ua pov thawj hauv cov dej num nrog h₂s.
Cov dej tob tob:Qhov twg siab dua lub zog dua L80 yog xav tau los tuav siab thiab lub tensile loads.
Siab - h siab / siab- kub (HPHT) WELLS:Raws li ib nrab ntawm lub zog kev xaiv nrog cov kev tawg ua kom zoo.
Lub ntsiab
API 5CT C95 is a critical casing grade that bridges the gap between medium-strength and high-strength applications in corrosive environments. Nws ua tib zoo tswj cov tshuaj muaj pes tsawg leeg ua ke, kev kho cua sov (kev txwv tsis pub siv rau kev sib tw drilling thiab ntau zog thiab tiv thaiv sulfide kev ntxhov siab tawg yog qhov tseem ceeb.
