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Title:
CHEMICAL SUBSTANCE FOR FORMING SOLID LUBRICANT COATING FILM, OIL WELL PIPE, AND SCREW-THREADED JOINT FOR OIL WELL PIPES
Document Type and Number:
WIPO Patent Application WO/2022/255166
Kind Code:
A1
Abstract:
With respect to the lubrication properties of an oil well pipe during fastening and loosing operations, the present invention achieves, by using a solid lubricant coating film, seize resistance at a level equal to or higher than that achieved by the dope compounding method of the conventional technique. Provided is a screw-threaded joint for oil well pipes, the screw-threaded joint being provided with a box (2) having a thread and a pin (1) having a male thread (1a). A lubricant coating film provided with a solid lubricant coating film (3) is formed on a fastening surface (10) of a thread part in at least one component selected from the box (2) and the pin (1), the solid lubricant coating film (3) is composed of a solid lubricant agent dispersed in a binder resin, a polyamide-imide resin makes up 90% by weight or more of the binder resin, the average molecular weight of the polyamide-imide resin is 20,000 to 40,000 inclusive, PTFE (polytetrafluoroethylene) makes up 80% by weight or more of the solid lubricant agent, and the average molecular weight of the PTFE is 30,000 or less.

Inventors:
ISHIGURO YASUHIDE (JP)
YOSHIKAWA MASAKI (JP)
GOTO SEIGO (JP)
SAWAKI TETSURO (JP)
SATO HIDEO (JP)
SHODA KOICHI (JP)
OKUBO AKIRA (JP)
KOBAYASHI RYOTA (JP)
KUBO RYOTA (JP)
TOYOSAWA KOTA (JP)
Application Number:
PCT/JP2022/021278
Publication Date:
December 08, 2022
Filing Date:
May 24, 2022
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
TOYO DRILUBE CO LTD (JP)
International Classes:
C10M157/02; C10M129/40; C10M147/02; C10M149/18; F16B33/06; F16L15/04; C10N20/04; C10N30/06; C10N40/00; C10N50/08
Domestic Patent References:
WO2014042144A12014-03-20
WO2015030252A12015-03-05
WO2009072486A12009-06-11
Foreign References:
JP2013108556A2013-06-06
JP2013209960A2013-10-10
JPH03168259A1991-07-22
JPH01289896A1989-11-21
JPS63286435A1988-11-24
JP2015506445A2015-03-02
US20090078328A12009-03-26
JP2021091461A2021-06-17
Other References:
TSURU ET AL., JOURNAL OF THE JAPANESE ASSOCIATION FOR PETROLEUM TECHNOLOGY, vol. 61, no. 6, 1996, pages 527 - 536
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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