Nippon Steel has filed a patent for an oil-well metal pipe with a resin coating containing a resin, solid lubricant powder, and copper phthalocyanine. The pipe main body includes a pin and a box, each with contact surfaces including thread parts. The coating is applied to at least one of these contact surfaces. GlobalData’s report on Nippon Steel gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Nippon Steel, vehicle camshaft manufacturing was a key innovation area identified from patents. Nippon Steel's grant share as of September 2023 was 24%. Grant share is based on the ratio of number of grants to total number of patents.

Oil-well metal pipe with resin coating for lubrication

Source: United States Patent and Trademark Office (USPTO). Credit: Nippon Steel Corp

A recently filed patent (Publication Number: US20230312946A1) describes an oil-well metal pipe with improved performance and durability. The pipe main body includes a pin at one end and a box at the other end. The pin has an external thread part, while the box has an internal thread part. The patent claims that the oil-well metal pipe further includes a resin coating containing a resin, a solid lubricant powder, and copper phthalocyanine on or above at least one of the pin contact surface and the box contact surface.

According to the patent, the resin coating may contain 0.2 to 30.0 mass % of copper phthalocyanine. Additionally, the resin coating may consist of 60 to 90 mass % of resin and 1 to 30 mass % of solid lubricant powder. Alternatively, the resin coating may contain 0.2 to 9.0 mass % of copper phthalocyanine.

The oil-well metal pipe may also include a plating layer or a chemical conversion treatment layer between the pin or box contact surface and the resin coating. Furthermore, the resin coating may contain a rust preventive pigment.

The pin and box contact surfaces may undergo treatments such as blasting or pickling. The resin used in the coating can be epoxy resin, phenol resin, acrylic resin, urethane resin, polyester resin, polyamide-imide resin, polyamide resin, polyimide resin, or polyether ether ketone resin.

The solid lubricant powder in the resin coating can be graphite, zinc oxide, boron nitride, talc, molybdenum disulfide, tungsten disulfide, graphite fluoride, tin sulfide, bismuth sulfide, organic molybdenum, thiosulfate compounds, or polytetrafluoroethylene.

The pin contact surface includes a pin sealing surface and a pin shoulder surface, while the box contact surface includes a box sealing surface and a box shoulder surface.

The patent also describes a method for producing the oil-well metal pipe. The method involves applying a composition containing resin, solid lubricant powder, and copper phthalocyanine onto the pin or box contact surface and hardening the composition to form a resin coating.

Overall, this patent proposes an oil-well metal pipe with a resin coating containing specific ingredients to enhance its performance and durability. The inclusion of copper phthalocyanine, solid lubricant powder, and appropriate treatments on the contact surfaces may contribute to improved functionality in oil-well applications.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies