Txheej txheem cej luam
K55 yog tus qauv qib ntawm seamless steel yeeb nkab txhais los ntawmLub koom haum American Petroleum (API) Specification 5CT. Qhov kev qhia tshwj xeeb no tswj hwm kev tsim khoom ntawm "Casing thiab Tubing" siv hauv cov roj thiab roj qhov dej.
Tus "K" xaiv nws raws li qib nrog qhov yuav tsum tau muaj qhov siab tshaj plaws hardness txwv, ua rau nws tsim nyog rau qee qhov kev pabcuam qaub (hydrogen sulfide- muaj) ib puag ncig uas cov hlau hnyav dua tuaj yeem tawg.
1. Cov Lus Qhia Tseem Ceeb thiab Cov Khoom Siv Tshuaj / Mechanical
K55 yog cov pa roj carbon lossis tsawg- alloy steel. Nws cov khoom tau piav qhia hauv API 5CT.
Chemical Composition (kwv yees)
API 5CT tsis tso cai rau cov tshuaj nruj me ntsis rau K55 tab sis teeb tsa qhov siab tshaj plaws rau cov ntsiab lus xws li Phosphorus (P) thiab Sulfur (S) kom ntseeg tau tias weldability thiab toughness. Ib qho piv txwv muaj xws li:
Cov pa roj carbon (C):0.34 - 0.50% (muaj zog)
Manganese (Mn):1.00 - 1.60% (nce zog thiab hardenability)
Phosphorus (P):Tsawg dua los yog sib npaug rau 0.030% ( impurity, khaws cia qis)
Sulfur (S):Tsawg dua los yog sib npaug rau 0.030% ( impurity, khaws cia qis)
Mechanical Properties
Qhov no yog thawj txoj hauv kev los faib K55 yeeb nkab.
| Khoom | Tus nqi | Sau ntawv |
|---|---|---|
| Yield zog (min) | 55,000 psi (379 MPa) | Qhov kev ntxhov siab uas cov yeeb nkab pib deform mus tas li. |
| Yield zog (max) | 80,000 psi (552 MPa) | Qhov siab tshaj plaws yog teem los xyuas kom meej toughness thiab ductility. |
| Tensile zog (min) | 95,000 psi (655 MPa) | Qhov kev ntxhov siab uas cov yeeb nkab yuav tawg. |
| Hardness (max) | 255 HWB/ 25.4 HRC | Qhov no yog ibtseem ceeb featurentawm K55, ua rau nws qib "Restricted Hardness" rau kev pabcuam qaub. |
| Elongation | Nws txawv raws qib thiab qhov loj me | Ib qho kev ntsuas ntawm ductility. |
2. Cov ntawv thov tseem ceeb
K55 seamless yeeb nkab feem ntau yog siv los uacasinghauv cov roj thiab roj qhov dej.
Nto Casing:Qhov no yog daim ntawv thov feem ntau. Nws yog thawj txoj hlua ntawm cov yeeb nkab khiav mus rau hauv qhov dej los tiv thaiv thaj chaw dej tshiab, ua kom lub qhov dej ruaj khov nyob ze ntawm qhov chaw, thiab muab lub hauv paus rau kev tiv thaiv kev tawm tsam (BOPs). Nws lub zog yog txaus rau cov kev ntxhov siab uas tau ntsib ntawm qhov tob no.
Intermediate Casing:Siv los kaw cov txheej txheem tsis ruaj khov lossis thaj chaw uas muaj qhov sib txawv sib sib zog nqus hauv qhov dej.
Conductor Casing:Thawj cov yeeb nkab teeb, feem ntau nyob rau hauv ntiav, loj - qhov ntev.
Nws yogtsawg feem ntau siv raws li tubing(cov yeeb nkab uas cov roj thiab cov roj ntws mus rau saum npoo) vim tias siab dua - qib zog xws li J55 lossis L80 feem ntau nyiam rau qhov siab dua uas tau ntsib hauv cov hlua ntau lawm.
3. Cov yam ntxwv tseem ceeb thiab qhov zoo
Lub zog zoo - rau - Tus nqi sib piv:K55 muaj qhov sib npaug ntawm lub zog thiab kev pheej yig, ua rau nws xaiv kev lag luam rau ntau qhov chaw zoo.
Sour Service Suitability:Nws qhov siab tshaj plaws hardness txwv ntawm 25.4 HRC ua rau nws tiv taus Sulfide Stress Cracking (SSC) hauvme ntsis qaub ib puag ncig. Txawm li cas los xij, rau kev pabcuam qaub hnyav dua, qib zoo li L80 Hom 1 feem ntau tau teev tseg.
Seamless Kev Tsim Kho:Cov txheej txheem tsim khoom seamless (raws li tsis yog ERW - Hluav taws xob Resistance Welded) tsim cov yeeb nkab nrog lub zog zoo thiab kev ncaj ncees nyob ib ncig ntawm nws qhov ncig, ua rau nws muaj kev ntseeg siab nyob rau hauv kev kub siab thiab kev sib tsoo.
Muaj:Nws yog ib qho zoo heev thiab dav muaj qib los ntawm steel mills thoob ntiaj teb.
4. K55 vs. Lwm Cov Qib API 5CT
Nws yooj yim to taub K55 los ntawm kev muab piv rau cov qib zoo sib xws.
| Qib | Qhov txawv ntawm qhov tseem ceeb ntawm K55 | Hom Siv Case |
|---|---|---|
| J55 | Zoo sib xws yield zog (55-80 ksi), tab sistsis muaj qhov siab tshaj plaws hardness. | Siv hauv qhov dej ntiav, qab zib (tsis yog- qaub) qhov SSC tsis muaj kev txhawj xeeb. Feem ntau pheej yig dua K55. |
| L80 | Ntau dua qhov tsawg kawg nkaus tawm lub zog (80 ksi) nrog tib max hardness txwv (25.4 HRC). | Siv rau qhov dej tob uas xav tau lub zog siab dua lossis hauv cov kev pabcuam qaub ntau dua. |
| N80 | Lub zog zoo sib xws (80-110 ksi), tab sisHom 1 tsis muaj hardness tswj. N80 Hom Q muaj kev txwv siab dua. | Ib qho dav dav - qib hom phiaj rau qhov tob tob, qhov dej qab zib. Tsis haum rau kev pabcuam qaub tshwj tsis yog tias tau teev tseg raws li Hom Q. |
| P110 | Lub zog ntau dua (110-140 ksi min yield). Hardness feem ntau yog siab. | Siv rau qhov tob, siab - qhov dej siab. Tsis yog rau kev pabcuam qaub. |
Kev sib piv ntau tshaj yog K55 vs. J55:
Yog tias koj nyob hauv ib cheeb tsam nrog txawm tias apeev xwmrau H2S (kua roj),K55 yog qhov kev xaiv nyab xeeb duavim nws hardness tswj.
Yog tias koj paub tseeb tias lub qhov dej yog "qab zib" (tsis muaj H2S),J55 feem ntau xaivraws li nws yuav raug nqi ntau dua -zoo.
5. Kev txiav txim siab tseem ceeb rau cov neeg yuav khoom / cov neeg siv khoom
Xov hom:K55 casing yuav tsum tau threaded. Cov kev sib txuas uas muaj xws li:
STC (Short Xov Coupling)
LTC (Long Thread Coupling)
BTC (Butter Thread Coupling)
Hwm Kev Sib Txuasrau cov qhov dej tseem ceeb ntxiv.
Hom xov yuav tsum tau teev thaum xaj.
Sour Service Disclaimer:Thaum K55 lub hardness yog tswj, nws siv nyob rau hauv ib tug paub qaub ib puag ncig yuav tsum tau validated los ntawm ib tug corrosion engineer. Cov yam ntxwv zoo li qhov tseeb H2S concentration, pH, thiab qib kev ntxhov siab tag nrho cuam tshuam rau kev tsim nyog.
Ntawv pov thawj:Nco ntsoov thov tusMill Test Certificate (MTC) lossis API Monogram. Cov ntaub ntawv no tau lees paub tias cov yeeb nkab tau tsim thiab sim rau API 5CT cov qauv thiab muab cov txiaj ntsig ntawm cov tshuaj lom neeg thiab cov khoom siv rau cov khoom siv.
Qhov Loj Loj:K55 seamless yeeb nkab yog muaj nyob rau hauv ntau yam ntawm sab nraud diameters (OD), feem ntau los ntawm ib ncig ntawm 4.5 nti mus rau 13-3/8 ntiv tes thiab loj, nrog rau ntau yam phab ntsa thicknesses (qhov hnyav).
Hauv cov ntsiab lus,K55 Seamless Steel Yeeb Nkab yog ntau yam, txwv tsis pub- hardness casing qibuas muab kev txhim khu kev qha thiab tus nqi -kev daws teeb meem zoo rau ntau yam kev siv roj thiab roj siv, tshwj xeeb yog qhov kev pabcuam me me yog qhov xav tau.
