Expandable Wellbore Tool Barrier Coating Hydrolysis Delay
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Solution Overview
Problem
Current wellbore anchors face difficulties in sealing roughened or scaled surfaces and open hole scenarios, requiring force to activate and providing inadequate sealing compared to swellable rubber packers.
Innovation Solution
An expandable metal wellbore tool with a barrier coating layer that delays hydrolysis reaction, allowing the metal to expand and create a pressure seal or anchor without external force, suitable for both cased and open hole operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber sealing assembly is used to seal off flow around the downhole tool, then sealing capability is improved, but the device complexity and force requirements increase
Solution Approach 1:
The patent removes the rubber sealing assembly from the downhole tool design. Instead of using a separate rubber packer for sealing, the tool relies on the hydrolysis-induced expansion of the metallic body itself to create the seal against the wellbore wall, thereby eliminating the complex rubber sealing component
Solution Approach 2:
The patent combines the sealing function with the structural body of the downhole tool. The metallic body that provides structural support also performs the sealing function when it expands through hydrolysis, merging multiple functions into a single component and reducing overall device complexity
2Strength
If slips are extended outwards to engage and grip the casing, then anchoring capability is improved, but the force required to activate the tool increases
Solution Approach 1:
The patent implements a self-activating mechanism where the downhole tool automatically expands and anchors itself through hydrolysis of the metallic body when exposed to wellbore fluids. No external actuation force is required - the chemical reaction itself provides the driving force for expansion and anchoring
Solution Approach 2:
The patent utilizes a change in the physical state and volume of the metallic body through hydrolysis. The metallic body transforms from a compact state to an expanded state as it reacts with wellbore fluids, changing its volume and dimensional parameters to achieve anchoring without external force
3Productivity
If the metallic body is exposed to wellbore fluid immediately upon deployment, then expansion and sealing occur quickly, but the tool cannot be positioned accurately before expansion
Solution Approach 1:
The patent applies a barrier coating to the metallic body before deployment that prevents immediate hydrolysis. This preliminary protective action allows the tool to be transported and positioned accurately in its collapsed state, and only after proper positioning does the barrier coating fail and expansion begin
Solution Approach 2:
The barrier coating acts as an intermediary layer between the metallic body and the wellbore fluid. It temporarily prevents direct contact between the reactive metal and the fluid, enabling controlled timing of the expansion process after the tool is properly positioned in the wellbore
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 provides a superior seal and anchoring capability with reduced operational force, being cost-effective and effective in various wellbore conditions, including open holes, by using a metal that expands upon hydrolysis, triggered by a wellbore fluid after a predetermined delay.
Implementation Method 1
the expandable member comprises a metal having an outer surface and configured to expand in response to hydrolysis
Implementation Method 2
a barrier coating layer covering at least a portion of the outer surface of the expandable member, the barrier coating layer having a composition formulated to react with a wellbore fluid and erode within a predetermined amount of time
Data Source
AI summary
Disclosed herein are aspects of a barrier coating layer of an expandable member wellbore tool for use in a wellbore. The barrier coating layer, in one aspect, covers at least a portion of the outer surface of the expandable member and has a composition formulated to react with a wellbore fluid and erode within a predetermined amount of time to allow a wellbore fluid to contact and hydrolyze the expandable member.