Downhole Eutectic Sealing Tool for Tubular Repair
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Solution Overview
Problem
Current downhole sealing technologies face challenges in effectively sealing and repairing tubular members within wellbores, particularly in achieving a durable and conformal seal in subterranean formations, due to limitations in materials and methods for applying sealing materials at elevated temperatures and pressures.
Innovation Solution
A sealing tool comprising a mandrel with a eutectic sealing material, which has a lower melting point than its constituents, is conveyed through a wellbore and heated to melt, allowing it to be molded onto the inner surface of tubular members, forming a durable seal through a spreader mechanism that ensures adherence and solidification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing materials and methods are used, then sealing can be achieved, but the seal is not durable or conformal enough in subterranean formations
Solution Approach 1:
The patent changes the physical state parameter of the sealing material by using a eutectic alloy that melts at a specific temperature. The material transitions from solid to liquid when heated, allowing it to flow and conform to the tubular member's inner surface, then solidifies upon cooling to form a durable seal. This parameter change enables both conformality during application and durability in the final state.
Solution Approach 2:
The patent uses a eutectic sealing material composed of multiple metal constituents (such as bismuth, lead, tin, or cadmium) that together create a material with a melting point lower than any individual component. This composite approach allows the material to remain solid during conveyance but melt at controlled temperatures for sealing, providing both handling stability and sealing effectiveness.
2Reliability
If sealing material is applied at elevated temperatures and pressures, then sealing effectiveness improves, but material application becomes more difficult
Solution Approach 1:
The patent exploits the phase transition of the eutectic sealing material from solid to liquid at its eutectic temperature. During conveyance, the material remains solid and easy to handle. When heated to the eutectic temperature downhole, it melts and flows to conform to the tubular member's surface. After application, it solidifies again to form the seal. This phase transition simplifies application by eliminating the need to handle hot material throughout the entire process.
3Ease of operation
If a eutectic sealing material with lower melting point is used, then material handling during conveyance is easier, but heating control becomes more critical
Solution Approach 1:
The patent utilizes the eutectic temperature parameter of the sealing material as a controlled threshold. The heating system is designed to raise the material temperature to just above its eutectic point, triggering the solid-to-liquid phase change. This parameter-based control allows for precise temperature management - heating enough to melt the material for sealing, but not so much as to cause degradation or loss of control, since the phase change occurs at a specific temperature threshold.
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 eutectic sealing material effectively forms a conformal, durable patch on the tubular member's inner surface, enabling reliable sealing and repair, even in damaged or perforated sections, and can be used for both cased and open-hole wellbores, enhancing well intervention operations.
Implementation Method 1
The eutectic sealing material has a eutectic temperature at which the eutectic sealing material melts
Implementation Method 2
means for heating the eutectic sealing material to at least the eutectic temperature
Implementation Method 3
The sealing tool may include a spreader operable to distribute the melted eutectic sealing material onto an inner surface of the tubular member
Implementation Method 4
The eutectic sealing material may be allowed to cool and solidify, forming a patch on the tubular member
Data Source
AI summary
A sealing tool for conveyance within a tubular member within a wellbore extending into a subterranean formation. The sealing tool includes a mandrel and a eutectic sealing material disposed about the mandrel. The eutectic sealing material has a eutectic temperature at which the eutectic sealing material melts. The sealing tool also includes means for heating the eutectic sealing material to at least the eutectic temperature. The eutectic sealing material is transferred onto an inner surface of the tubular member by activating the heating means to heat the eutectic sealing material to at least the eutectic temperature to melt the eutectic sealing material.