Galling-resistant threaded tubular component and process for coating said component

摘要

A galling-resistant threaded tubular component for drilling or operating hydrocarbon wells includes at one of its ends a threaded zone produced on its external or internal peripheral surface depending on whether the threaded end is male or female in type, with at least one portion of the threaded zone being coated with a dry film with a crystalline structure with a high specific surface area principally constituted by one or more mineral salts which are not reactive towards metals, and a process for coating such a component using a dry mineral film with a crystalline structure having a high specific surface area principally constituted by one or more mineral salts which are not reactive towards metals.

主权项

1. A process for coating a galling-resistant steel tubular component made of one or more metals for drilling or operating hydrocarbon wells, the tubular component including at an end thereof a threaded zone produced on one of an external or internal peripheral surface of the tubular component, depending on whether the end having the threaded zone is male or female in type, the process comprising:
dissolving one or more mineral salts, which are not reactive towards the metals of the tubular component, in a solvent so as to form a solution; pre-heating the threaded zone of the tubular component; depositing the solution directly on at least a portion of a steel surface of the threaded zone after the pre-heating; and evaporating off the solvent to obtain a dry film having a crystalline mineral structure having a high specific surface area and which is not reactive towards the steel of the tubular component, wherein the specific surface area of the dry film having a crystalline mineral structure is more than 20 m2/g, wherein the solution is an alkaline silicate dissolved in water, and wherein the pre-heating the threaded zone of the tubular component includes heating the threaded zone between 50° C. and 250° C. before depositing the solution.