Casing is a large-diameter pipe that serves as the structural retainer for the walls of
oil and gas wells, or wellbore. It is inserted into a well bore and cemented in place
to protect both subsurface formations and the wellbore from collapsing and to allow
drilling fluid to circulate and extraction to take place.
O.D. | Nominal | O.D. | W.T. | Nominal | Type of pipe end | ||||||||
Weight | Weight | Grade | |||||||||||
(lb/ft) | (kg/m) | J-55 | L-80 | N-80 | C-90 | ||||||||
In. | mm | In. | mm | H-40 | K-55 | M-65 | C-95 | Type1,Q | T-95 | P-110 | |||
5 1/2" | 14.00 | 5.500 | 139.70 | 0.244 | 6.20 | 20.83 | PS | PS | PS | -- | -- | -- | -- |
15.50 | 5.500 | 139.70 | 0.275 | 6.98 | 23.07 | -- | PSLB | PSLB | -- | -- | -- | -- | |
17.00 | 5.500 | 139.70 | 0.304 | 7.72 | 25.30 | -- | PSLB | PLB | PLB | PLB | PLB | PLB | |
20.00 | 5.500 | 139.70 | 0.361 | 9.17 | 29.76 | -- | -- | PLB | PLB | PLB | PLB | PLB | |
23.00 | 5.500 | 139.70 | 0.415 | 10.54 | 34.23 | -- | -- | PLB | PLB | PLB | PLB | PLB | |
26.80 | 5.500 | 139.70 | 0.500 | 12.70 | 39.88 | -- | -- | -- | -- | -- | P | -- | |
29.70 | 5.500 | 139.70 | 0.562 | 14.27 | 44.20 | -- | -- | -- | -- | -- | P | -- | |
32.60 | 5.500 | 139.70 | 0.625 | 15.88 | 48.51 | -- | -- | -- | -- | -- | P | -- | |
35.30 | 5.500 | 139.70 | 0.687 | 17.45 | 52.53 | -- | -- | -- | -- | -- | P | -- | |
38.00 | 5.500 | 139.70 | 0.750 | 19.05 | 56.55 | -- | -- | -- | -- | -- | P | -- | |
40.50 | 5.500 | 139.70 | 0.812 | 20.62 | 60.27 | -- | -- | -- | -- | -- | P | -- | |
43.10 | 5.500 | 139.70 | 0.875 | 22.22 | 64.14 | -- | -- | -- | -- | -- | P | -- | |
P - Plain; S - Short round thread; L - Long round thread; B - Buttress thread |