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

Title:

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

Document Type and Number:

WIPO Patent Application WO/2002/073001

Kind Code:

A1

Abstract:

(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 $m(F) 30 / (1 + 0.018 a) ...1 where $g(a) is the pipe expansion percentage (%) calculated from the following formula 2. $g(a) = [(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.

Inventors:

ARAI YUJI (JP)
KONDO KUNIO (JP)
AMAYA HISASHI (JP)
YAMANE AKIHITO (JP)

Application Number:

PCT/JP2002/002261

Publication Date:

September 19, 2002

Filing Date:

March 11, 2002

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
ARAI YUJI (JP)
KONDO KUNIO (JP)
AMAYA HISASHI (JP)
YAMANE AKIHITO (JP)

International Classes:

B21B39/20; B21C1/24; C21D9/08; C22C38/00; C22C38/02; C22C38/04; C22C38/12; C22C38/22; C22C38/28; E21B7/20; E21B43/10; (IPC1-7): E21B43/10; E21B7/20; B21B39/20; C22C38/00; C22C38/28

Domestic Patent References:

WO1999055999A1	1999-11-04
WO1999035368A1	1999-07-15
WO1993025799A1	1993-12-23

Other References: