Logging Tool Thermal Protection Using Phase Change Material
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Solution Overview
Problem
Conventional logging equipment is susceptible to damage in high-temperature well applications, such as enhanced oil recovery operations involving steam injection, limiting its feasibility in monitoring subterranean formation properties effectively.
Innovation Solution
A logging tool is positioned within a non-metallic flask surrounded by an insulating material, such as phase change material, to extend its operational time in hot environments by acting as a heat sink and providing thermal protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional logging equipment is used in high-temperature well applications, then the equipment can perform logging functions, but the equipment is susceptible to damage due to temperature exceeding its rating
Solution Approach 1:
A thermal protection system acts as an intermediary between the hot well environment and the logging tool. The system includes an insulating barrier and phase change material that absorb and dissipate heat, preventing direct thermal contact between the high-temperature formation and the logging equipment, thereby enabling operation above the tool's temperature rating
Solution Approach 2:
Phase change material is incorporated into the thermal protection system to absorb excessive heat through phase transition (melting/freezing). This phase change process consumes large amounts of latent heat, effectively buffering the temperature rise and extending the operational time of the logging tool in high-temperature environments
2Productivity
If steam injection is used to heat the formation for enhanced oil recovery, then oil recovery rates are improved, but the use of conventional logging tools is restricted due to high temperatures
Solution Approach 1:
The thermal protection system serves as a mediator that enables conventional logging tools to operate in steam-injected formations. By isolating the tool from the high-temperature steam environment, the system allows these tools to perform monitoring functions during enhanced oil recovery operations that would otherwise be impossible
Solution Approach 2:
The phase change material in the protection system absorbs the intense heat from steam injection through phase transition, creating a thermal buffer that protects the logging tool. This enables the tool to monitor formation properties during steam-assisted oil recovery without being damaged by the thermal conditions
3Measurement precision
If logging tools are used to monitor formation properties in detail, then measurement quality is improved, but the operational time is limited due to temperature constraints
Solution Approach 1:
The phase change material extends the operational time by absorbing heat through phase transition. This thermal buffering effect allows the logging tool to maintain safe operating temperatures for extended periods, enabling detailed formation monitoring over longer durations than would otherwise be possible in high-temperature environments
Solution Approach 2:
The thermal protection system enables continuous logging operations by maintaining safe operating temperatures throughout extended periods. The phase change material continuously absorbs and dissipates heat, allowing the logging tool to perform measurements without interruption or temperature-related shutdowns
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 enables extended logging times in temperatures above the tool's rating, allowing for detailed monitoring of subterranean formations during high-temperature operations like steam-assisted oil recovery, without significant redesign of existing tools.
Implementation Method 1
The logging tool is surrounded with an insulating material and/or a material with a high heat of fusion
Implementation Method 2
a material with a high heat of fusion, e.g. phase change material, disposed within the non-metallic flask
Implementation Method 3
a material with a high heat of fusion, e.g. phase change material
Data Source
AI summary
A technique facilitates the logging of hot, subterranean environments with a variety of logging tools. Logging tools with temperature limit ratings may be employed in environments that would otherwise be detrimental to operation of the logging tool due to the heat. The logging tool may be protected through placement of the tool at a desired location within a non-metallic flask. The logging tool also is surrounded with an insulating material and/or a material with a high heat of fusion disposed within the non-metallic flask to increase the time span for operating the logging tool in the hot, subterranean environment.