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 | |||
7" | 17.00 | 7.000 | 177.80 | 0.231 | 5.87 | 25.30 | PS | -- | -- | -- | -- | -- | -- |
20.00 | 7.000 | 177.80 | 0.272 | 6.91 | 29.76 | PS | PS | PS | -- | -- | -- | -- | |
23.00 | 7.000 | 177.80 | 0.317 | 8.05 | 34.23 | -- | PSLB | PLB | PLB | PLB | PLB | -- | |
26.00 | 7.000 | 177.80 | 0.362 | 9.19 | 38.69 | -- | PSLB | PLB | PLB | PLB | PLB | PLB | |
29.00 | 7.000 | 177.80 | 0.408 | 10.36 | 43.16 | -- | -- | PLB | PLB | PLB | PLB | PLB | |
32.00 | 7.000 | 177.80 | 0.453 | 11.51 | 47.62 | -- | -- | PLB | PLB | PLB | PLB | PLB | |
35.00 | 7.000 | 177.80 | 0.498 | 12.65 | 52.09 | -- | -- | -- | PLB | PLB | PLB | PLB | |
38.00 | 7.000 | 177.80 | 0.540 | 13.72 | 56.55 | -- | -- | -- | PLB | PLB | PLB | PLB | |
42.70 | 7.000 | 177.80 | 0.625 | 15.88 | 63.54 | -- | -- | -- | -- | -- | P | -- | |
46.40 | 7.000 | 177.80 | 0.687 | 17.45 | 69.05 | -- | -- | -- | -- | -- | P | -- | |
50.10 | 7.000 | 177.80 | 0.750 | 19.05 | 74.56 | -- | -- | -- | -- | -- | P | -- | |
53.60 | 7.000 | 177.80 | 0.812 | 20.62 | 79.77 | -- | -- | -- | -- | -- | P | -- | |
57.10 | 7.000 | 177.80 | 0.875 | 22.22 | 84.97 | -- | -- | -- | -- | -- | P | -- | |
P - Plain; S - Short round thread; L - Long round thread; B - Buttress thread |