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 | |||
6 5/8" | 20.00 | 6.625 | 168.28 | 0.288 | 7.32 | 29.76 | PS | PSLB | PSLB | -- | -- | -- | -- |
24.00 | 6.625 | 168.28 | 0.352 | 8.94 | 35.72 | -- | PSLB | PLB | PLB | PLB | PLB | PLB | |
28.00 | 6.625 | 168.28 | 0.417 | 10.59 | 41.67 | -- | -- | PLB | PLB | PLB | PLB | PLB | |
32.00 | 6.625 | 168.28 | 0.475 | 12.06 | 47.62 | -- | -- | -- | PLB | PLB | PLB | PLB | |
P - Plain; S - Short round thread; L - Long round thread; B - Buttress thread |