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 | |||
8 5/8" | 24.00 | 8.625 | 219.08 | 0.264 | 6.71 | 35.72 | -- | PS | PS | -- | -- | -- | -- |
28.00 | 8.625 | 219.08 | 0.304 | 7.72 | 41.62 | PS | -- | PS | -- | -- | -- | -- | |
32.00 | 8.625 | 219.08 | 0.352 | 8.94 | 47.67 | PS | PSLB | PSLB | -- | -- | -- | -- | |
36.00 | 8.625 | 219.08 | 0.400 | 10.16 | 53.57 | -- | PSLB | PSLB | PLB | PLB | PLB | -- | |
40.00 | 8.625 | 219.08 | 0.450 | 11.43 | 59.53 | -- | -- | PLB | PLB | PLB | PLB | PLB | |
44.00 | 8.625 | 219.08 | 0.500 | 12.70 | 65.48 | -- | -- | -- | PLB | PLB | PLB | PLB | |
49.00 | 8.625 | 219.08 | 0.557 | 14.15 | 72.92 | -- | -- | -- | PLB | PLB | PLB | PLB | |
P - Plain; S - Short round thread; L - Long round thread; B - Buttress thread |