Nickel Boride Pump Barrel Coating for Wear and Corrosion
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Solution Overview
Problem
Conventional downhole pump barrels in sucker-rod artificial lift systems suffer from wear, abrasion, and corrosion due to harsh production fluids containing particles and corrosive materials, leading to system failure and sub-optimal performance.
Innovation Solution
A downhole pump barrel with a tubular core element coated with a Nickel Boride layer and an inner layer substantially free of Boron, where the Nickel Boride layer provides wear resistance and the inner layer acts as a protective barrier against corrosion, formed through a Nickel plating and Boronization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a chrome coating is applied to the barrel surface to increase wear resistance, then wear/abrasion resistance is improved, but micro-cracks form in the chrome layer that propagate to create crevasses allowing corrosive fluid to contact and damage the metal surface
Solution Approach 1:
The patent applies a nickel-based coating containing carbide particles to the barrel surface, creating a composite material structure. The nickel matrix provides corrosion resistance while the carbide particles provide wear resistance, eliminating the need for separate chrome coating and its associated micro-crack problems.
Solution Approach 2:
The patent modifies the coating material composition by using nickel-based alloy with carbide particles instead of pure chrome plating. This parameter change in material composition maintains hardness and wear resistance while improving corrosion resistance and eliminating the micro-crack propagation issue.
2Reliability
If a NiCarb coating is applied to the barrel surface to provide corrosion and wear resistance, then corrosion and wear resistance is improved, but abrasive particles in production fluid can penetrate and strip away the soft nickel matrix, removing the coating over time
Solution Approach 1:
The patent uses a nickel-based coating with dispersed carbide particles, creating a composite structure where the hard carbide particles are embedded in the nickel matrix. This composite structure provides both corrosion resistance from the nickel and wear resistance from the carbide, while the overall coating remains adherent and resistant to stripping by abrasive particles.
Solution Approach 2:
The coating structure provides different properties at different locations: the nickel matrix provides corrosion resistance throughout, while the carbide particles provide localized wear resistance. This local differentiation of properties allows the coating to withstand both corrosive and abrasive conditions simultaneously.
3Reliability
If a nickel matrix coating is applied to the barrel surface, then corrosion resistance is improved, but the soft nickel matrix can be stripped away by abrasive particles over time, exposing the metal surface to harsh production fluid
Solution Approach 1:
The patent enhances the nickel matrix coating by incorporating hard carbide particles into the nickel-based material. This composite structure maintains the corrosion resistance of the nickel matrix while the embedded carbide particles provide abrasion resistance, preventing the coating from being stripped away by abrasive particles in the production fluid.
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 solution enhances the lifespan and operational efficiency of the pump barrel by providing robust protection against wear and corrosion, preventing micro-cracks from extending to the core and maintaining the integrity of the barrel.
Implementation Method 1
the Nickel Boride region provides hardness
Implementation Method 2
the Nickel region offers corrosion resistance
Implementation Method 3
an interior layer formed on at least a portion of the interior surface
Data Source
AI summary
A downhole pump barrel is nickel plated to a predefined thickness followed by Boronizing a portion of nickel matrix to create Nickel Boride layer and leaving a layer of nickel between the newly formed Nickel Boride and the barrel metal surface. The top layer of Nickel Boride provides a hard surface like chrome plating which increases the wear/abrasion resistance during the sucker rod pump production. The nickel matrix disposed beneath the Nickel Boride acts as a barrier from any corrosion attacks reaching the barrel metal surface.