THREADED JOINT FOR OIL WELL PIPE AND COMPOSITION FOR LIGHT-CURABLE FILM COVERING

Title:

THREADED JOINT FOR OIL WELL PIPE AND COMPOSITION FOR LIGHT-CURABLE FILM COVERING

Document Type and Number:

WIPO Patent Application WO/2015/198557

Kind Code:

A1

Abstract:

　Provided is a threaded joint for an oil well pipe with which it is possible to suppress the increase in torque when a pin and a box are linked in a cold region. The threaded joint (1) for an oil well pipe of the present embodiment is provided with a pin (2) and a box (3). The pin (2) and the box (3) have respective contact surfaces (21, 31) having threaded parts (22, 32) and threadless metal contact parts (23, 33). The contact surface (21) of the pin (2) is provided with a light-curable film covering (25) as the uppermost layer. The light-curable film covering (25) contains a light-curable resin and perfluoro polyether. The contact surface (31) of the box (3) is provided with a solid lubricating film covering (35) as the uppermost layer.

Inventors:

GOTO KUNIO (JP)

Application Number:

PCT/JP2015/002994

Publication Date:

December 30, 2015

Filing Date:

June 16, 2015

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)

International Classes:

F16L15/04; E21B17/042

Domestic Patent References:

WO2009072486A1	2009-06-11
WO2007102370A1	2007-09-13
WO2013183634A1	2013-12-12
WO2010147142A1	2010-12-23

Foreign References:

JP2008069883A	2008-03-27
JP2013545041A	2013-12-19
JP2012518713A	2012-08-16
JP2011515258A	2011-05-19

Other References: