Raws li API SPEC 5CT Version 11 (tso tawm thaum Lub Kaum Ob Hlis 2023), qhov kev tso cai sib txawv rau cov phab ntsa tuab yog 0 txog -12.5%, txhais tau tias cov phab ntsa tuab yuav tsum tsis pub tsawg dua 87.5% ntawm nominal phab ntsa thickness.
Feem ntau cov phab ntsa thickness muaj xws li: 5.21 mm, 6.45 mm, 7.01 mm, 8.53 mm, 9.52 mm, 11.18 mm, 13.46 mm, thiab 16.13 mm, thiab lwm yam, uas yog standardized specifications matched nrog lub sab nraud txoj kab uas hla.
API 5CT Casing Phab Ntsa Thickness Specification Table
| Sab nraud txoj kab uas hla (OD - nti) | Nominal Nyhav (lb/ft) | Phab ntsa Thickness (inch) | Phab ntsa Thickness (mm) | Sab hauv Diameter Reference (ID - mm) |
| 4 1/2" | 9.50 | 0.205 | 5.21 | 103.88 |
| (114.30 hli) | 11.60 | 0.250 | 6.35 | 101.60 |
| 13.50 | 0.290 | 7.37 | 99.56 | |
| 5" | 11.50 | 0.220 | 5.59 | 115.82 |
| (127.00 hli) | 13.00 | 0.250 | 6.35 | 114.30 |
| 15.00 | 0.296 | 7.52 | 111.96 | |
| 5 1/2" | 14.00 | 0.244 | 6.20 | 127.30 |
| (139.70 hli) | 15.50 | 0.275 | 6.98 | 125.74 |
| 17.00 | 0.304 | 7.72 | 124.26 | |
| 20.00 | 0.361 | 9.17 | 121.36 | |
| 7" | 20.00 | 0.272 | 6.91 | 163.98 |
| (177.80 hli) | 23.00 | 0.317 | 8.05 | 161.70 |
| 26.00 | 0.362 | 9.19 | 159.42 | |
| 29.00 | 0.408 | 10.36 | 157.08 | |
| 32.00 | 0.453 | 11.51 | 154.78 | |
| 9 5/8" | 36.00 | 0.352 | 8.94 | 226.58 |
| (244.48 hli) | 40.00 | 0.395 | 10.03 | 224.41 |
| 43.50 | 0.435 | 11.05 | 222.38 | |
| 47.00 | 0.472 | 11.99 | 220.50 | |
| 13 3/8" | 48.00 | 0.330 | 8.38 | 322.96 |
| (339.72 hli) | 54.50 | 0.380 | 9.65 | 320.42 |
| 61.00 | 0.430 | 10.92 | 317.88 | |
| 68.00 | 0.480 | 12.19 | 315.34 | |
| 20" | 94.00 | 0.438 | 11.13 | 485.75 |
| (508.00 hli) | 106.50 | 0.500 | 12.70 | 482.60 |
| 133.00 | 0.635 | 16.13 | 475.74 |
API 5CT CasingPhab ntsa Thickness kam rau ua
| Parameter | Khoom Siv Tau | Kev kam rau siab (Limit) |
| Yam tsawg kawg ntawm phab ntsa Thickness | Tag nrho cov Casing & Tubing Sizes | -12.5%ntawm nominal phab ntsa thickness |
| Qhov siab tshaj plaws phab ntsa thickness | Tag nrho cov Casing & Tubing Sizes | Tswj los ntawmNyhav Tolerance |
API 5CT Casing Phab Ntsa Thickness Daim Ntawv Thov & Cov Lus Qhia Xaiv
| Zoo Tshooj / Daim Ntawv Thov | Primary Engineering Kev txhawj xeeb | Phab ntsa Thickness (WT) Strategy | Piv txwv li (OD / Nyhav / Qib) |
| Nto Casing | Txhawb nqa cov txheej av hauv av thiab tiv thaiv cov cheeb tsam ntawm cov dej tsis zoo. | Lub Teeb Phab Ntsa (Standard): Tsom ntsoov rau OD loj kom haum rau cov cuab yeej drilling tom ntej; siab tawg kuj feem ntau tsis tas yuav tsum tau. | 9 5/8", 36.00 lb/ft (8.94mm) J55/K55 |
| Intermediate / Technical Casing | Kev cais cov txheej txheem nyuaj, siab - thaj chaw dej siab, lossis sloughing shales. | Phab ntsa nruab nrab: Qhov sib npaug ntawm kev sib tsoo tsis sib haum thiab kev tshem tawm sab hauv (Drift) rau cov hlua casing tom ntej. | 7", 26.00 lb/ft (9.19mm) N80/L80 |
| Deep Production Casing | External reservoir pressures uas yuav ua rau casing vau. | Phab ntsa hnyav: Nce nce ntxivCollapse Resistancetxhawm rau ua haujlwm siab geostatic loads ntawm qhov tob tob. | 5 1/2", 23.00 lb/ft (10.59mm) P110 |
| Siab -Hloov siab (HP) Gas Wells | Cov kua dej sab hauv siab heev (Burst loads) thiab xav tau roj- nruj nruj. | Phab ntsa hnyav: SiabKev kub ntxhovkev ntaus nqi. Cov phab ntsa tuab kuj yog qhov zoo rau kev ua haujlwmPremium Gas-Kev sib txuas nruj. | 7", 32.00 lb/ft (11.51mm) P110/Q125 |
| Kev Pab Cuam (
H2S/CO2H2S/CO2 ) |
Maj mam phab ntsa thinning tshwm sim los ntawm tshuaj lom neeg corrosion dhau lub neej ntawm lub qhov dej. | Corrosion Allowance: Ntxiv cov thickness ntau tshaj li cov qauv kev xav tau lossis kev sib txuas nrog cov hlau tshwj xeeb (xws li 13Cr). | Tsim- tshwj xeeb, feem ntau yog 5%-10% tuab dua li tus qauv. |
| Thermal Recovery (Steam Injection) | Extreme axial stress tshwm sim los ntawm thermal expansion thiab contraction cycles. | Phab ntsa tuab: Txhim khu lub zog tensile thiab creep tsis kam tiv thaiv cov yeeb nkab deformation nyob rau hauv qhov kub thiab txias. | 7 ", 29.00 lb/ft (10.36mm) L80/C90 |
| Directional / Kab rov tav Wells | Siab torque, luag, thiab dabtsi yog khoov stresses (dogleg hnyav). | Balanced Phab ntsa: Yuav tsum tuab txaus los tiv thaiv buckling, tab sis nyias txaus kom nyob twj ywm saj zawg zog thiab txo rig hoist loads. | 5 1/2", 17.00 - 20.00 lb/ft (7.52 - 8.94mm) |
GNEE API Casing Hoobkas
FAQ
Dab tsi yog qhov ntau thiab tsawg casing?
Qhov ntau thiab tsawg ntawm casing muaj xws li:4½", 5", 5½", 6⅝", 7", 7⅝", 8⅝", 9⅝", 10¾", 11¾", 13⅜", 16", 18⅝", 20", thiab lwm yam. Cov phab ntsa thickness series: xws li 5.21 hli, 6.35 hli, 7.72 hli, 9.17 hli, 10.36 hli, thiab lwm yam.
Dab tsi yog qhov roj qhov dej casing?
Casing yogloj txoj kab uas hla uas yog sib sau ua ke thiab muab tso rau hauv ib tug nyuam qhuav drilled seem ntawm ib tug borehole thiab feem ntau tuav rau hauv qhov chaw nrog xis mas. Casing uas yog cemented nyob rau hauv qhov chaw pab cov txheej txheem drilling nyob rau hauv ob peb txoj kev: Tiv thaiv kom txhob muaj kab mob ntawm cov dej tshiab zones.
