Functions Of Couplings
Casing and tubing couplings are essential components in the oil and gas industry, serving to connect lengths of casing or tubing pipes together, which are made from materials that match or exceed the grade of the casing or tubing.
Specifications Of Couplings For Casing Pipe
Casing Size: 4.5’’-20’’
Connection: STC, LTC, BTC, ZC-series Premium
Grade: J55, K55, N80 ,L80, P110, etc.
Size | Thread Type | Grade | PSL | Standard |
STC | LTC | BTC |
4-1/2" | ● | ● | ● | C110
C90
H40
J55
K55
N80Q
N801
R95
L80-1
P110
Q125 L80-13cr P110-13cr | PSL-1
PSL-2
PSL-3 | API 5CT & 5B Latest Edition |
5" | ● | ● | ● |
5-1/2" | ● | ● | ● |
6-5/8" | ● | ● | ● |
7" | ● | ● | ● |
7-5/8" | ● | ● | ● |
8-5/8" | ● | ● | ● |
9-5/8" | ● | ● | ● |
10-3/4" | ● |
| ● |
11-3/4" | ● |
| ● |
13-3/8" | ● |
| ● |
16" | ● |
| ● |
18-5/8" | ● |
| ● |
20" | ● | ● | ● |
Specifications Of Couplings For Tubing Pipe
Tubing Size: 1.315’’-4.5’’
Connection: EU, NU, ZC-series Premium
Grade: J55, K55, N80 ,L80, P110, etc.
Size | Thread Type | Grade | PSL | Standard |
NU | EU | SCC | S13 |
2-3/8" | ● | ● | ● | ● | C110
C90
H40
J55
K55
N80Q
N801
R95
L80-1
P110
Q125 L80-13cr P110-13cr | PSL-1
PSL-2
PSL-3 | API 5CT & 5B Latest Edition |
2-7/8" | ● | ● | ● | ● |
3-1/2" | ● | ● | ● | ● |
4" | ● | ● |
| ● |
4-1/2" | ● | ● |
| ● |
Surface Treatment On Couplings
-Phosphating
-Zinc Plating
-Chrome Plating
-Epoxy Coating
Pup Joints
Pup joint is a kind of short-length casing and tubing, that are used to adjust the length of the overall string. These pup joints are typically threaded on both ends and come in various lengths to facilitate the necessary adjustments in the wellbore.
Common Length: 1ft, 2ft, 3ft, 4ft, 6ft, 8ft, 10ft, etc..
Grade: J55, K55, N80 ,L80, P110, etc.
