Hauv kev lag luam roj thiab roj, API Circular Thread Casing Couplings yog cov khoom siv tseem ceeb siv los txuas ob ntu ntawm cov casing.
Raws li qhov ntev ntawm cov xov, lawv feem ntau muab faib ua ob pawg:
STC (Short Threaded and Coupled): Short circular thread couplings.
LTC (Long Threaded thiab Coupled): Ntev xov txuas txuas.
API Circular Thread Casing Couplings Technical Parameters
Siv tau Standard:API Spec 5CT(American Petroleum Institute Standard).
Common Steel Qib: J55, K55, N80, L80, P110, thiab lwm yam.
Xov Profile: Ob lub crests thiab cov hauv paus hniav ntawm threads feature ib puag ncig (arc{0}}zoo li tus) profile (V-zoo li tus xov nrog cov lus qhia sib npaug).
Xov Density: Feem ntau 8 threads ib nti (8 TPI).
Kev kho deg: Feem ntau kho los ntawm phosphating los yog tooj liab plating los txhim kho kev hnav tsis kam thiab tiv thaiv xov galling.
Kev sib piv: STC vs. LTC Casing Couplings
| Feature | STC (Short Round Xov) | LTC (Long Round Xov) |
| Xov Length | Shorter xov ntev. | Ntev xov ntev. |
| Kev sib txuas muaj zog | Kwv yees li 60% -80% ntawm cov yeeb nkab lub cev muaj zog. | Lub zog sib koom ua ke siab dua STC; zoo structural kev ncaj ncees. |
| Daim ntawv thov | Cov qhov dej ntiav ntiav, tsawg- qhov chaw siab, thiab cov hlua luv luv. | Cov qhov dej tob dua, siab - ib puag ncig nruj, thiab cov hlua ntev ntev. |
| Sealing Performance | Relies ntawm xov compound (dope) los sau qhov khoob ntawm cov xov rau kev sib khi. | Cov xov sib txuas loj dua muab kev sib khi zoo tshaj plaws thiab ua kom tsis muaj zog. |
API Round Xov Casing Coupling Dimensions
Nco tseg:STC=Luv Round Thread, LTC=Ntev Round Thread. Cov lus no suav nrog cov kev qhia tshwj xeeb uas tau xaiv; tag nrho cov npog qhov ntau thiab tsawg los ntawm 4-1 / 2 "mus rau 20".
| Casing OD (Size) | Xov Hom | Coupling OD - W (hauv / mm) | Coupling Ntev - L (in/mm) | Txoj kab uas hla ntawm Counterbore - Q (in/mm) |
| 4-1/2" | STC | 5.000 (127.00) | 6.250 (158.75) | 4.610 (117.09) |
| 4-1/2" | LTC | 5.000 (127.00) | 7.000 (177.80) | 4.610 (117.09) |
| 5-1/2" | STC | 6.050 (153.67) | 6.750 (171.45) | 5.610 (142.49) |
| 5-1/2" | LTC | 6.050 (153.67) | 8.000 (203.20) | 5.610 (142.49) |
| 7" | STC | 7.656 (194.46) | 7.250 (184.15) | 7.110 (180.59) |
| 7" | LTC | 7.656 (194.46) | 9.000 (228.60) | 7.110 (180.59) |
| 9-5/8" | STC | 10.625 (269.88) | 7.750 (196.85) | 9.735 (247.27) |
| 9-5/8" | LTC | 10.625 (269.88) | 10.625 (269.88) | 9.735 (247.27) |
| 13-3/8" | STC | 14.375 (365.13) | 8.000 (203.20) | 13.485 (342.52) |
| 20" | STC | 21.000 (533.40) | 9.000 (228.60) | 20.125 (511.18) |
API 5CT Casing Coupling Tolerance Requirements
API cov qauv tswj xyuas nruj nruj kom ntseeg tau tias muaj kev nyab xeeb thiab kev ntseeg siab ntawm kev ua haujlwm ntawm cov roj av.
| Yam khoom | Ua siab ntev | Lus hais |
| Coupling sab nraud txoj kab uas hla (W) | ±1% | Kev hloov me ntsis tuaj yeem siv rau qhov loj dua qhov tshwj xeeb. |
| Coupling Ntev (L) | ± 1/8 nti (± 3.18mm) | Ua kom muaj kev sib raug zoo thiab kev sib koom ua ke tob. |
| Txoj kab uas hla ntawm Counterbore (Q) | +0.031 hauv / -0 | Xyuas kom yooj yim nkag thiab sib dhos ntawm lub casing. |
| Internal Alignment/Consistency | Yuav tsum ua raws li API cov qauv | Tshawb xyuas siv tshwj xeeb API xov plug gauges. |
| Xov Form (Xov) | 8 TPI (8 Threads Per Inch) | Txheem rau Round Thread (STC/LTC) configurations. |
Qhov zoo thiab cov khoom yuav tsum tau muaj
Cov lus no qhia tau hais tias GNEE txoj kev tswj xyuas zoo thiab ua raws li cov qauv thoob ntiaj teb.
| Cov khoom kuaj xyuas (Checklist) | Standard / Requirement | GNEE Quality Control Method |
| Qib Steel | J55, K55, N80, L80, P110 | Kev tsom xam Spectroscopiclos xyuas thiab paub meej tias cov tshuaj muaj pes tsawg leeg. |
| Tsis yog -Kev Ntsuas Kev Puas Tsuaj (NDT) | 100% Magnetic Particle Inspection (MPI) | Kev tshuaj ntsuam xyuas kom paub meej txog ib qho twgtawg, slag inclusions, los yog nto defects. |
| Kev kho deg (xov) | Phosphatinglos yogtooj liab plating | Siv los tiv thaivxov gallingthaum lub sij hawm pleev thiab breakout txheej txheem. |
| Kev Ntsuas Hydrostatic | Ua raws li API 5CT teev cov qib siab | Ua los xyuas kom meejleak- pov thawj kev ua haujlwmnyob rau hauv qhov siab heev - siab. |
| Xim Coding / ID | Cov xim tshwj xeeb sib xws rau qib steel (xws li, Ntsuab rau J55) | Muabkev txheeb xyuas yooj yimrau ntawm - tus neeg teb xov tooj chaw thiab kev tswj cov khoom lag luam. |
API Coupling xeem thiab tshuaj xyuas cov cuab yeej
API Casing Coupling Hoobkas
FAQ
Dab tsi yog qhov txawv ntawm Casing coupling thiab tubing coupling?
nws lub ntsiab sib txawv ntawmCasing CouplingsthiabTubing Couplingstuaj yeem sau tau nyob rau hauv peb qhov tseem ceeb:Loj, Muaj nuj nqi, thiabXov Hom.
| Feature | Casing Coupling | Tubing Coupling |
| Loj (OD) | Loj dua:Feem ntau 4-1/2 "rau 20". | Me me:Feem ntau 1.05 "rau 4-1/2". |
| Muaj nuj nqi | Siv los txuascov kav dejkab ntawd thiab stabilize lub wellbore. | Siv los txuascev cevuas thauj roj lossis roj mus rau saum npoo. |
| Xov Hom | Feem ntauSTC, LTC, lossis BTC(Npaj ntaub xov). | Feem ntauEUE(Sab nraud chim) los yogNUJ(Tsis yog- chim siab). |
| Phab ntsa Thickness | Feem ntau thinner txheeb ze rau txoj kab uas hla. | Feem ntau thicker los tswj cov dej ntws sab hauv. |
API coupling yog dab tsi?
IbAPI Couplingyog lub siab -lub zog, sab hauv threaded luv yeeb nkab siv los txuas ob qhov ntev ntawm cov yeeb nkab roj (casing lossis tubing).
Standardized Quality:Nws yog manufactured nruj me ntsis raws li covAPI Spec 5CT(American Petroleum Institute) cov qauv, kom ntseeg tau tias nws tuaj yeem tiv taus huab cua hauv av.
Lub "Bridge":Nws ua raws li qhov sib txuas ntawm ob lub yeeb nkab sib txuas, muab cov dej xau- pov thawj foob thiab cov qauv kev ncaj ncees rau tag nrho cov hlua zoo.
Hom Hom:
Casing Couplings:Txuas cov kav dej loj dua (Types: STC, LTC, BTC).
Tubing Couplings:Txuas cov kav dej me me (Types: EUE, NUE).
