CASING COUPLINGS; SMLS; EUE &NUE COUPLINGS; OILFIELDUSE
;COUPLING STOCK MATERIAL; API 5CT STANDARD
Product Name: CASING COUPLINGS; SMLS; EUE &NUE COUPLINGS;
OILFIELD TOOLS USE ;COUPLING STOCK MATERIAL
Standards: API SPEC 5CT, API SEPC 5B, API-7
Material/Steel Grade: J/K55, N80, L80-1, 80SS, L80-3Cr, L80 13Cr,
L80-9CR, Super 13Cr, P110, P110-13CR, TP110S, etc.
Specifications: OD-127mm-356.12mm (4-1/2''-13-3/8'')
Thread buckle type: BTC/STC/LTC
Casing coupling is the connecting part of casing to transmit
environmental load, and is also the weak link that is prone to
failure accidents.
It is well-known, the integrity of wellbore in the life cycle is
not only limited by the thread connection strength of casing, but
also by the sealing performance of coupling threads (Han and Wang,
1999). Therefore, it is of great significance to study the sealing
integrity of casing coupling under non-uniform load.
CASING COUPLING : A short length of pipe used to connect two joints of casing. A casing coupling has internal threads (female threadform) machined to match the external threads (male threadform) of the
long joints of casing. The two joints of casing are threaded into
opposite ends of the casing coupling.
STC/LTC COUPLING SIZE LIST
| size (in) | pipe OD mm | coupling OD W mm | Min length NL mm | bore diameter Q mm | bore depth q mm | bearing surface width b mm | hand-tight standoff A | Distance from pipe end to coupling center after tightening J mm | thread numer for each inch | weight KG short coupling | weight KG long coupling |
| 4-1/2'' | 114.3 | 127 | 158.75(short)/177.8(long) | 116.68 | 12.7 | 3.97 | 3 | 12.7 | 8 | 3.62 | 4.15 |
| 5'' | 127 | 141.3 | 165.1(short)/196.85(long) | 129.38 | 12.7 | 4.76 | 3 | 12.7 | 8 | 4.66 | 5.75 |
| 5-1/2'' | 139.7 | 153.67 | 171.45(short)/203.2(long) | 142.08 | 12.7 | 3.18 | 3 | 12.7 | 8 | 5.23 | 6.42 |
| 7'' | 177.8 | 194.46 | 184.15(short)/228.6(long) | 180.18 | 12.7 | 4.76 | 3 | 12.7 | 8 | 8.39 | 10.83 |
| 9-5/8'' | 244.48 | 269.88 | 196.85(short)/266.7(long) | 248.44 | 11.0 | 6.35 | 3 1/2 | 12.7 | 8 | 18.03 | 25.45 |
| 10-3/4'' | 273.05 | 298.45 | 203.2 | 277.02 | 11.0 | 6.35 | 3 1/2 | 12.7 | 8 | 20.78 | - |
| 13-3/8'' | 339.72 | 365.12 | 203.2 | 343.69 | 11.0 | 5.56 | 3 1/2 | 12.7 | 8 | 25.66 | - |
| 16'' | 406.4 | 431.8 | 228.6 | 411.96 | 9.3 | 5.56 | 3 1/2 | 12.7 | 8 | 34.91 | - |
| 18-5/8'' | 473.08 | 508 | 228.6 | 478.63 | 9.3 | 5.56 | 3 1/2 | 12.7 | 8 | 54.01 | - |
| 20'' | 508 | 533.4 | 228.6(short)/292.1(long) | 513.56 | 9.3 | 5.56 | 4 | 12.7 | 8 | 43.42 | 57.04 |
BTC COUPLING SIZE LIST
| size (in) | pipe OD mm | coupling OD W mm | Min length NL mm | bore diameter Q mm | bearing surface width b mm | hand-tight standoff A | Distance from pipe end to coupling center after tightening J mm | thread numer for each inch | weight KG |
| 4-1/2'' | 114.3 | 127 | 225.42 | 117.86 | 3.18 | 1/2. | 12.7 | 5 | 4.55 |
| 5'' | 127 | 141.3 | 231.78 | 130.56 | 3.97 | 1 | 12.7 | 5 | 5.85 |
| 5-1/2'' | 139.7 | 153.67 | 234.95 | 143.26 | 3.97 | 1 | 12.7 | 5 | 6.35 |
| 7'' | 177.8 | 194.46 | 254 | 181.36 | 5.56 | 1 | 12.7 | 5 | 10.54 |
| 9-5/8'' | 244.48 | 269.88 | 269.88 | 248.03 | 9.52 | 1 | 12.7 | 5 | 23.16 |
| 10-3/4'' | 273.05 | 298.45 | 269.88 | 276.61 | 9.52 | 1 | 12.7 | 5 | 25.74 |
| 13-3/8'' | 339.72 | 365.12 | 269.88 | 343.28 | 9.52 | 1 | 12.7 | 5 | 31.77 |
| 16'' | 406.4 | 431.8 | 269.88 | 410.31 | 9.52 | 7/8. | 12.7 | 5 | 40.28 |
| 18-5/8'' | 473.08 | 508 | 269.88 | 476.99 | 9.52 | 7/8. | 12.7 | 5 | 62.68 |
| 20'' | 508 | 533.4 | 269.88 | 511.91 | 9.52 | 7/8. | 12.7 | 5 | 50.1 |
