Steel pipe for embedding-expanding, and method of...

Details Steel pipe for embedding-expanding, and method of... Steel pipe for embedding-expanding, and method of...

2007-04-27

2008-12-02

Bomar, Shane (Department: 3676)

Wells

Processes

Assembling well part

C166S277000, C166S207000, C148S320000

Reexamination Certificate

active

07458426

ABSTRACT:
(1) A steel pipe that is expanded radially in a state wherein it was inserted in a well such as an oil well, characterized in that the non-uniform wall thickness ratio E0(%) before expanding satisfies the following expression {circle around (1)}.in-line-formulae description="In-line Formulae" end="lead"?E0≦30/(1+0.018α)  {circle around (1)}in-line-formulae description="In-line Formulae" end="tail"?Wherein α is the pipe expansion ratio (%) calculated by the following expression {circle around (2)}.in-line-formulae description="In-line Formulae" end="lead"?α=[(inner diameter of the pipe after expanding−inner diameter of the pipe before expanding)/inner diameter of the pipe before expanding]×100  {circle around (2)}in-line-formulae description="In-line Formulae" end="tail"?(2) A steel pipe that should be expanded radially in a state wherein it is inserted in a well, such as an oil well, characterized in that the eccentric non-uniform wall thickness ratio is 10% or less.When the embedding-expanding method is performed with use of the steel pipe of (1) or (2), lowering of collapse strength of the expanded steel pipe is prevented and bending thereof can be decreased.

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