STEEL PIPE FOR USE AS EMBEDDED EXPANDED PIPE, AND METHOD OF EMBEDDING OIL-WELL STEEL PIPE.

摘要

(1) A steel pipe to be expanded in a state in which it is inserted in a well, such as an oil well, characterized in that the wall thickness eccentricity EO(%) prior to pipe expansion satisfies the following formula 1: EO le; 30 / (1 + 0.018 a) ...1 where agr; is the pipe expansion percentage (%) calculated from the following formula 2. agr; = [(inner diameter of pipe subsequent to pipe expansion inner diameter of pipe prior to pipe expansion) / inner diameter of pipe prior to pipe expansion] x 100 ...2. (2) A steel pipe to be expanded in a state in which it is inserted in a well, characterized in that the wall thickness eccentricity is not more than 10%. If a pipe embedding and expanding method is embodied using the steel pipe described in (1) or (2) above, the expanded steel pipe is prevented from having its crushing strength decreased, and the bending of the steel pipe is reduced.