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出典:Wikipedia
出典:『Wikipedia』 (2010/09/13 05:48 UTC 版)
Casing string is a long section of connected oilfield pipe that is lowered into a wellbore and cemented. The pipe segments (called "joints") are typically about 40 feet (12 m) in length, male threaded on each end and connected with short lengths of double-female threaded pipe called couplings. (Some specialty casing is manufactured in one piece with a female thread machined directly into one end.)