Patent ID: 9562400
Date: 2017-02-07
CPC Classifications: C09D,C10M,C10N,E21B

Claim:
1. A tubular element for drilling and/or working hydrocarbon wells, comprising: an end portion having at least one threaded zone, wherein the end portion is at least partially coated with a dry film which comprises a matrix and at least one migrating sliding agent in the matrix principally distributed in the vicinity of a free surface of the lubricating dry film, the migrating sliding agent being concentrated to 65% by weight in an upper 15 microns of a thickness of the dry film, wherein said at least one sliding agent is selected from the group consisting of: polydimethylsiloxane type silicone oil with a surface tension of less than 24 mN/m and a kinematic viscosity in the range 100 to 1850 mm perfluoropolyether with a kinematic viscosity in the range 150 to 1850 mm