Counter Current Reactant Flow for Well Tool Coating
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Solution Overview
Problem
Well tools used in downhole operations are prone to internal corrosion and abrasion due to fluids like hydrogen sulfide and mercury, leading to reduced lifespan and operational issues.
Innovation Solution
A hybrid coating system utilizing chemical vapor deposition (CVD) and atomic layer deposition (ALD) processes to apply protective coatings on the interior surfaces of well tools, creating a compact and portable system for on-site application, using counter current flow of reactants to enhance bonding and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating is deposited on the interior surface of a well tool to protect against corrosion and abrasion, then the tool lifespan and reliability are improved, but the complexity of the coating system and equipment requirements increase
Solution Approach 1:
The patent combines CVD and ALD processes into a single hybrid coating system that operates in the same chamber, eliminating the need for separate vacuum chambers and complex equipment setups. The system integrates reactant delivery, heating, and coating deposition into one unified apparatus that can be deployed on-site.
Solution Approach 2:
The invention extracts the essential coating deposition function from complex commercial vacuum chambers, creating a simplified portable system that maintains coating quality while removing unnecessary complexity. The system uses a simplified chamber design that can be deployed in the field without requiring expensive commercial vacuum infrastructure.
2Object-affected harmful factors
If a protective coating is applied to well tool surfaces, then resistance to corrosion and abrasion is improved, but the cost and complexity of using commercial vacuum chambers increases
Solution Approach 1:
The patent employs disposable or easily replaceable reactant cartridges that can be quickly exchanged during coating operations. This eliminates the need for complex gas delivery systems and expensive vacuum infrastructure, allowing the system to be deployed on-site without requiring commercial vacuum chamber rentals or installations.
Solution Approach 2:
The system uses an intermediary heating element that can be selectively positioned to heat specific zones within the coating chamber. This allows precise temperature control for the coating reaction without requiring complex vacuum maintenance systems, enabling the use of simpler, more portable equipment.
3Reliability
If counter current flow of reactants is used to enhance bonding, then coating durability is improved, but the control complexity of reactant delivery increases
Solution Approach 1:
The patent implements periodic pulsing of reactant delivery rather than continuous flow. Reactants are delivered in controlled pulses that allow the coating surface to bond between pulses, creating a more durable coating. This periodic action simplifies the delivery system by using on/off cycling rather than complex continuous flow control.
Solution Approach 2:
The system dynamically adjusts reactant delivery based on real-time coating chamber conditions, using feedback from temperature and pressure sensors to modulate reactant pulse timing and duration. This dynamic control achieves optimal bonding while keeping the delivery mechanism relatively simple through algorithm-based adjustment rather than complex mechanical systems.
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 coating system effectively protects well tool surfaces from corrosion and abrasion, extending tool lifespan and enabling operation in challenging environments without the need for expensive commercial vacuum chambers.
Implementation Method 1
A hybrid coating system utilizing chemical vapor deposition (CVD) and atomic layer deposition (ALD) processes to apply protective coatings on the interior surfaces of well tools
Implementation Method 2
A hybrid coating system utilizing chemical vapor deposition (CVD) and atomic layer deposition (ALD) processes to apply protective coatings on the interior surfaces of well tools
Implementation Method 3
using counter current flow of reactants to enhance bonding and durability
Data Source
AI summary
A coating system for coating an interior surface of a housing comprising: first and second closures engaging first and second ends, respectively, of the housing to provide an enclosed volume; first and second flow lines coupled to the first and second closures, respectively, the first flow line and/or the second flow line connected to an inert gas source; a reactant gas source(s) comprising a reactant gas and coupled to the first and/or second flow line; and a controller in electronic communication with the reactant gas and inert gas sources, and configured to control flow of inert gas into the enclosed volume, and counter current injection of reactant gas from the reactant gas source(s) into the enclosed volume whereby introduction of pulse(s) of the reactant gas into the enclosed volume are separated by introduction of inert gas into the enclosed volume, and coating layer(s) are deposited on the interior surface.