A high performance internal coating for drill tool surface spraying

The drill bit internal coating, with its three-layer composite structure and precise spraying process, solves the problem of insufficient performance of existing drill bit internal coatings under high temperature and high pressure environments, significantly improving the drill bit's high temperature resistance, wear resistance, and bonding strength, and extending its service life.

CN122189554APending Publication Date: 2026-06-12JIANGSU HEXIN PETROLEUM MACHINERY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU HEXIN PETROLEUM MACHINERY
Filing Date
2026-03-30
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing drill bit internal coatings are inadequate in high-temperature, high-pressure, and complex chemical environments, exhibiting poor bonding strength and easy detachment, thus failing to meet the needs of deep-water drilling and shale gas development.

⚗Method used

The inner coating adopts a three-layer composite structure, including a base layer, a functional layer, and a sealing layer, which are respectively composed of epoxy resin, nano-alumina, silane coupling agent, nickel-tungsten-titanium carbide cermet alloy, and fluorocarbon resin. Through precise spraying process and laser cladding treatment, the coating's high temperature resistance, wear resistance, and bonding strength are improved.

🎯Benefits of technology

The coating's high-temperature resistance is more than doubled, its wear resistance is increased by 3 times, its bonding strength reaches 60MPa, and its service life is extended by 2-3 times, reducing maintenance costs and safety risks.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the field of surface treatment technology of drilling equipment, and discloses a high-performance inner coating for surface spraying of drilling tools, which comprises a drilling tool, the surface of the drilling tool comprises an inner coating, and the inner coating is a three-layer composite structure which comprises, from the drilling tool base body outward, a bottom layer, a functional layer and a sealing control layer. The application comprehensively improves the performance of the drilling tool, is more than one time higher than the existing coating, the wear resistance is more than 3 times that of commonly used drilling equipment, the drilling tool has no pitting and cracking, is resistant to acid and alkali, can adapt to various complex drilling operations, has high bonding strength, has long service life through bottom layer modification and process optimization, the service life of the drilling tool adopting the coating is prolonged by 2-3 times in actual drilling conditions, the frequency of replacing the drilling tool is reduced, the maintenance cost and downtime are reduced, the process can be applied to drilling tools such as drilling rods and drilling collars of different specifications, the spraying equipment has high universality, and is easy to be popularized industrially.
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