THREADED JOINT FOR OIL WELL PIPE

Title:

THREADED JOINT FOR OIL WELL PIPE

Document Type and Number:

WIPO Patent Application WO/2001/016516

Kind Code:

A1

Abstract:

A threaded joint for an oil well pipe, characterized as having a screw part and/or a metal-metal contacting part with no screws which have, formed thereon, 1) a lubricating coating of an inorganic polymer having a skeleton of M (metal atom)-O (oxygen) and containing a solid lubricating agent dispersed and incorporated therein, 2) a phosphate coating and the above lubricating coating of an inorganic polymer, 3) a Cu plating layer, and the above lubricating coating of an inorganic polymer or a lubricating coating of a resin containing a solid lubricating agent dispersed and incorporated therein, or 4) the above lubricating coating of an inorganic polymer or the above lubricating coating of a resin, and a rust-inhibiting coating containing an alkali metal or alkaline earth metal salt of a carboxylic acid. The threaded joint for an oil well pipe can prevent the occurrence of galling in repeated make-up and break-out operations and at the same time secure high oil-tightness, with no use of a liquid lubricating agent such as a compounded grease.

Inventors:

YAMAMOTO HIDEO (JP)
NAKASUJI KAZUYUKI (JP)

Application Number:

PCT/JP2000/005661

Publication Date:

March 08, 2001

Filing Date:

August 24, 2000

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
YAMAMOTO HIDEO (JP)
NAKASUJI KAZUYUKI (JP)

International Classes:

C23C28/00; C23C30/00; F16L15/00; F16L15/04; F16L58/18; E21B17/042; (IPC1-7): F16L15/04; C23C26/00

Foreign References:

JPH05187581A	1993-07-27
JPS61117286A	1986-06-04
JPS5293864A	1977-08-06
JPH0361784A	1991-03-18
JPH10280176A	1998-10-20

Other References: