Internal Carbide-Coated Casing Pipe for Drilling Wear Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Casing tubes in the oil and gas industry experience significant wear due to drilling operations, leading to reduced thickness and weakened structures, particularly at connections, which cannot be mitigated by increasing tube thickness without increasing mass, and existing solutions do not effectively enhance resistance to internal wear.
Innovation Solution
A tubular steel pipe with a metal deposit layer on its internal surface, specifically a metal coating of chromium carbides or tungsten carbides in a cobalt or nickel matrix, applied using methods like high-speed flame spraying or electric arc spraying, to provide enhanced abrasion resistance without compromising the internal diameter or mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the casing thickness is increased to resist wear, then the wear resistance is improved, but the casing mass increases which is undesirable
Solution Approach 1:
The patent applies a metallic coating layer composed of hard particles (carbides, oxides, or intermetallic compounds) embedded in a metallic matrix material on the internal surface of the casing tube. This composite structure provides enhanced wear resistance at the surface while maintaining the base steel's mechanical properties and keeping the overall casing mass unchanged.
Solution Approach 2:
The metallic coating is applied specifically to the internal surface of the casing tube where wear occurs during drilling operations, rather than increasing the thickness of the entire casing. This localized enhancement provides wear resistance precisely where needed without adding unnecessary mass to the overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The metal coating significantly increases the resistance to casing wear while maintaining the passage of drill strings and connection performance, ensuring the tubular components remain effective and durable throughout their service life.
Implementation Method 1
the drill string proximal to the borehole, moving upward along the drill bit casing, causes wear on the casing tubes. Also, the rotational movements of the drill string can also cause wear on the casing tubes
Implementation Method 2
The metallic coating can be applied by a metal spraying method, by high-speed flame spraying, or by electric arc metal spraying
Implementation Method 3
by electric arc metal spraying between two wires
Data Source
Figure 1~3
Figure 4
AI summary
The invention relates to a tubular steel pipe (1, 21) which is sleeved or integrally threaded, comprising at least one first male threaded end, an inner surface (8, 28) and a metal deposition layer (10, 10p, 10b, 10m) on the inner surface (8, 28) and having a thickness of between 0.01 mm and 0.8 mm deposited on all or part of the inner surface (8, 28) of the pipe.