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 | |||
4 1/2" | 9.50 | 4.500 | 114.30 | 0.205 | 5.21 | 14.14 | PS | PS | PS | -- | -- | -- | -- |
10.50 | 4.500 | 114.30 | 0.224 | 5.69 | 15.63 | -- | PSB | PSB | -- | -- | -- | -- | |
11.60 | 4.500 | 114.30 | 0.250 | 6.35 | 17.26 | -- | PSLB | PLB | PLB | PLB | PLB | PLB | |
13.50 | 4.500 | 114.30 | 0.290 | 7.37 | 20.09 | -- | -- | PLB | PLB | PLB | PLB | PLB | |
15.10 | 4.500 | 114.30 | 0.337 | 8.56 | 22.47 | -- | -- | -- | -- | -- | -- | PLB | |
P-Plain; S-Short round thread; L-Long round thread; B-Buttress thread |