Fusible Alloy Wellbore Isolation via Powder Metallurgy
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Solution Overview
Problem
Traditional methods for removing retrievable isolation devices in oil and gas operations are time-consuming and costly, and can result in premature dissolution, especially due to the limited options for materials with suitable phase transition temperatures matching the varying bottomhole temperatures of wells.
Innovation Solution
A fusible alloy matrix is created using a powder metallurgy process, allowing for the production of isolation devices that undergo a phase transition at the bottomhole temperature, enabling efficient removal after use by selecting appropriate eutectic or hypo-eutectic compositions and incorporating density-reducing and strength-enhancing particles to ensure desired properties and prevent stratification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional materials are used for isolation devices, then the device can be manufactured with standard processes, but the removal process becomes time-consuming and costly due to limited material options for matching bottomhole temperatures
Solution Approach 1:
The patent applies parameter changes by varying the phase transition temperature of the alloy matrix to match different bottomhole temperatures. By adjusting compositional parameters (eutectic or hypo-eutectic compositions) and thermal parameters (melting points), the isolation device adapts to different well conditions, enabling temperature-specific phase transitions that facilitate controlled removal without time-consuming traditional retrieval methods
Solution Approach 2:
The patent utilizes phase transitions of the alloy matrix at specific temperatures to enable removal. The alloy is designed to undergo phase transition (solid to liquid or vice versa) at the bottomhole temperature, allowing the isolation device to be removed through controlled melting or phase change rather than mechanical retrieval, significantly reducing removal time and operational costs
2Ease of operation
If retrievable isolation devices are used, then the device can be removed after use, but premature dissolution occurs due to limited material options
Solution Approach 1:
The patent controls dissolution timing by precisely adjusting the phase transition temperature parameters of the alloy matrix. By selecting specific eutectic or hypo-eutectic compositions with defined melting points, the device remains stable during operation but undergoes controlled phase transition at the bottomhole temperature, preventing premature dissolution while ensuring reliable removal at the appropriate time
Solution Approach 2:
The patent replaces mechanical retrieval systems with a thermal-based removal mechanism. Instead of using mechanical tools to extract the device, the system uses controlled thermal phase transitions of the alloy matrix to enable self-removal or easy removal, eliminating the need for complex mechanical retrieval operations and preventing premature mechanical damage
3Manufacturing precision
If powder metallurgy process is used, then manufacturing precision and density control are improved, but the process complexity increases
Solution Approach 1:
The patent controls density and precision by adjusting compaction parameters during the powder metallurgy process. By varying pressure, temperature, and compositional parameters during manufacturing, the alloy matrix achieves desired density and uniformity, enabling precise control of the isolation device properties without requiring overly complex multi-step manufacturing processes
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 fusible alloy matrix isolation devices can be effectively used to restrict fluid flow and are removable after their intended use, reducing operational challenges and costs associated with traditional retrieval methods by ensuring phase transitions occur at optimal well temperatures.
Implementation Method 1
The fusible alloy matrix is selected so that it undergoes a phase transition at the bottomhole temperature
Implementation Method 2
fusing the particles together to form a solid material
Data Source
AI summary
A method of producing at least a portion of a wellbore isolation device comprising: providing a fusible alloy matrix in a powdered form; placing at least the particles of the fusible alloy matrix powder into a mold; compacting the particles located inside the mold via an application of pressure; and fusing the particles together to form a solid material, wherein the solid material forms the at least a portion of the wellbore isolation device.