Qhov loj me ntawmLTC (Long Round Xov)casing yog nruj me ntsis tswj los ntawm lubAPI 5Btxheem (Specification for Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads).
Qhov "Long" hauv LTC hais txog qhovthread ntev (L4), uas ntev tshaj li Txoj Xov Luv (STC) rau tib txoj kab uas hla. Qhov ntev ntxiv no muab cov xov txuas ntxiv, ua kom lub zog tensile ntawm kev sib txuas.
Ntsiab Technical Parameters
Txawm hais tias cov yeeb nkab loj npaum li cas, tag nrho API LTC threads qhia cov qauv tsim qauv:
Threads Per Inch (TPI): 8
Xov Profile:Rounded "V" zoo (60-degree nrog lub kaum ntse ntse).
Taper:1:16 (0.0625 mm / mm los yog 0.75 nti ib ko taw ntawm txoj kab uas hla).
Crest thiab Root:Rounded los tiv thaiv kev ntxhov siab concentration thiab txhim kho sealing.
Cov Txheej Txheem Loj Loj
Thaum saib ntawm API 5B qhov loj me rau LTC, koj yuav ntsib cov ntsiab lus tseem ceeb no:
D :Sab nraud txoj kab uas hla ntawm cov yeeb nkab.
L4 :Tag nrho ntev ntawm qhov kawg ntawm cov yeeb nkab mus rau qhov chaw ploj mus (Tag Nrho Xov Length).
L1 :Ntev ntawm tes - nruj kev sib koom tes.
E1 :Pitch txoj kab uas hla ntawm tes- nruj dav hlau.
E0 :Pitch txoj kab uas hla ntawm qhov kawg me me (kawg ntawm cov yeeb nkab).
API 5 CTLTC Xov Dimensions Table (Common Size)
Lus Cim: Qhov ntev yog nyob rau hauv nti. Tus nqi yog kwv yees raws li API 5B cov qauv.
| Pipe OD (Inches) | Tag Nrho Xov Length (L4) | Tes-Tight Engagement (L1) | Pitch Diameter ntawm E1 |
| 4-1/2" | 2.625 | 1.625 | 4.412 |
| 5-1/2" | 2.875 | 1.875 | 5.412 |
| 7" | 3.250 | 2.250 | 6.912 |
| 8-5/8" | 3.625 | 2.625 | 8.537 |
| 9-5/8" | 3.875 | 2.875 | 9.537 |
| 10-3/4" | 4.125 | 3.125 | 10.662 |
LTC Casing Specifications & Application Comparison Table
| Sab nraud Diameter (OD) | Cov Qib Siab | Pom zoo qhov tob | Daim ntawv thov tseem ceeb |
| 4-1/2" - 5-1/2" | J55, N80, P110 | 1,500m - 4,000m | Production Casing:Siv rau txoj hlua zaum kawg hauv qhov me me - tho qhov dej ncaj qha los tswj cov kev tsim khoom siab. |
| 7 "(Feem ntau) | N80, L80, P110 | 2,000m - 4,500m | Standard Production Casing:Qhov kev xaiv tseem ceeb thoob ntiaj teb rau qhov nruab nrab - qhov tob tob, ntsuas qhov chaw ntws thiab kev sib txuas lub zog. |
| 8-5/8" - 9-5/8" | J55, K55, N80 | 1,000m - 3,000m | Technical / Intermediate Casing:Siv los cais cov tsim tsis ruaj khov lossis siab - thaj chaw dej siab los tiv thaiv kev khawb ntxiv. |
| 10-3/4" - 13-3/8" | H40, J55, K55 | 500m - 1,500m | Nto Casing:Siv los ua kom lub qhov dej ruaj khov thiab tiv thaiv kev tawg ntawm cov dej ntiav; LTC muab kev sib zog ntau dua li STC hauv qhov ntau thiab tsawg. |
LTC vs. STC vs. BTC Sib piv Table
| Feature | STC (Short Round Xov) | LTC (Long Round Xov) | BTC (Butter Thread) |
| Lub Npe | Luv Round Xov | Ntev Round Xov | Buttress Xov |
| Xov Profile | Rounded "V" xov | Rounded "V" xov | Trapezoidal / Square- txiav |
| Threads per Inch (TPI) | 8 TSI | 8 TSI | 5 TSI |
| Xov Length | luv tshaj | Ntev dua(ntau tshaj STC) | Nruab nrab |
| Tensile zog | Standard (qis tshaj) | Siab dua (Zoo dua STC) | Heev (siab tshaj) |
| Sealing Performance | Zoo | Zoo heev(Longer seal txoj kev) | Zoo |
| Tsis kam mus dhia- tawm | Nruab nrab (Risk ntawm rub- tawm hauv qab hnyav) | Zoo | Superior(Txhob rub- tawm hauv qab hnyav) |
| Makeup/Installation Ceev | Ceev ceev | Nruab nrab | Ceev tshaj(Coarser threads) |
| Tus nqi tsim khoom | Feem ntau Economy | Nruab nrab | Siab dua me ntsis |
| Daim ntawv thov tseem ceeb | Qhov dej ntiav, Nto casing, cov hlua teeb | Cov qhov dej nruab nrab, Kev tsim cov casing, kev ua haujlwm txheem | Cov qhov dej tob, cov hlua hnyav, siab - qhov dej siab |
API Xov Factory
FAQ
Dab tsi yog qhov txawv ntawm LTC thiab BTC xov
Qhov sib txawv ntawm LTC thiab BTC nyob hauv lawv cov xov profile thiab tensile zog:
LTC (Long Round Xov): Nta ib puag ncig "V" xov profile nrog 8 threads ib nti. Nws muaj kev sib khi zoo heev thiab ua haujlwm raws li tus txheej txheem thoob ntiaj teb rau nruab nrab - qhov tob tob thiab cov pa ua haujlwm drilling.
BTC (Buttress Thread): Nta lub trapezoidal (square{0}}txiav) xov profile nrog 5 threads ib nti. Nws muaj lub zog tensile tshwj xeeb, tiv thaiv cov xov tsis sib xws (dhia- tawm) nyob rau hauv qhov hnyav tensile loads, ua rau nws qhov kev xaiv zoo tshaj plaws rau cov qhov dej tob thiab hnyav- cov hlua tubular.
Dab tsi yog qhov txawv ntawm casing threads?
STC (Short Round Xov):Rounded "V" puab, 8 TPI. Qhov zoo tshaj plaws rau qhov dej ntiav (Economy).
LTC (Long Round Xov):Ntev "V" zoo, 8 TPI. Txheem rau nruab nrab- qhov tob tob (Reliability).
BTC (Tebchaws)Trapezoidal / Square duab, 5 TPI. Qhov zoo tshaj plaws rau cov qhov dej sib sib zog nqus thiab hnyav hnyav (Lub zog).
Kev sib txuas hwm hwm:Cov qauv tsim tshwj xeeb nrog hlau- mus rau- hlau foob. Rau huab cua huab cua lossis siab - cov haujlwm siab (Kev Nyab Xeeb).
