Subterranean Heating Casing with Phase-Change Fluid and Fins
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Solution Overview
Problem
In in-situ mineral extraction, existing heating systems face challenges in achieving uniform heat distribution due to geological heterogeneities, leading to underheating or overheating, which can reduce extraction efficiency and degrade product quality.
Innovation Solution
A heating system for subterranean mineral formations that includes a casing with a heating element and a heat transfer fluid undergoing phase changes to regulate temperature, combined with a boiling fluid and fins to enhance heat transfer, ensuring consistent heat delivery and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If constant power is applied to the heater along its length, then the heater structure is simple, but underheating or overheating occurs in parts of the formation that dissipate heat more quickly or slowly than average
Solution Approach 1:
The heater is divided into multiple heating zones along its length, with each zone having independently controllable power output. This allows different sections of the heater to deliver different power levels matched to the local heat dissipation characteristics of the formation, achieving uniform temperature distribution while maintaining a relatively simple segmented structure.
2Power
If higher heating power is applied to overcome geological heterogeneities, then heat penetration is improved, but product degradation increases due to excessive temperature
Solution Approach 1:
Different heating zones along the heater are equipped with independent power control systems that can adjust power output based on real-time temperature feedback from sensors. This localized control allows the system to apply higher power where needed to overcome geological heterogeneities while maintaining lower power in sensitive areas to prevent product degradation.
Solution Approach 2:
Temperature sensors distributed along the heater provide real-time feedback to a control system that dynamically adjusts the power output of each heating zone. This closed-loop control prevents excessive temperature rise that would cause product degradation while ensuring sufficient heat penetration into the formation.
3Object-affected harmful factors
If temperature-limited electric heaters are used to prevent overheating, then product degradation is reduced, but the extent of desired changes facilitating extraction is limited
Solution Approach 1:
The heater is segmented into multiple zones with independent temperature and power control, allowing different sections to operate at different temperature levels optimized for their specific geological conditions. This enables the system to achieve both protection against product degradation and sufficient heating for extraction efficiency.
Solution Approach 2:
The heating system transitions from static temperature limitation to dynamic control where power and temperature can be adjusted in real-time based on formation response. This allows the system to adapt to changing thermal conditions and optimize both protection and extraction efficiency throughout the heating process.
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 system achieves uniform heating, optimizing heat transfer coefficients and preventing product degradation by maintaining a well-controlled temperature, thereby enhancing the extraction of premium quality products from mineral formations.
Implementation Method 1
at least a portion of the heat transfer fluid is undergoing phase changes between liquid and gas in order to regulate a temperature of the casing
Implementation Method 2
at least a portion of the heat transfer fluid is undergoing phase changes between liquid and gas in order to regulate a temperature of the casing
Implementation Method 3
a heating element positioned within the casing... the heat transfer fluid configured to transfer heat between the heating element and the inner surface of the casing
Implementation Method 4
the casing is at least partially immersed in a boiling fluid in the bore of the subterranean mineral formation, wherein the boiling fluid enhances heat transfer from the outer surface of the casing to the subterranean mineral formation
Implementation Method 5
the casing is at least partially immersed in a boiling fluid in the bore of the subterranean mineral formation
Implementation Method 6
a plurality of fins on the outer surface of the casing, the plurality of fins configured to enhance a rate of heat transfer between the casing and the subterranean mineral formation
Data Source
AI summary
A heating system for a subterranean mineral formation according to embodiments of the present invention includes a casing positioned in a bore in the subterranean mineral formation, the casing having an outer surface and an inner surface, a heating element positioned within the casing, a surface connection system having a first end coupled to the heating element within the casing and a second end at a top ground surface above the subterranean mineral formation, a heat transfer fluid contained within the casing, the heat transfer fluid configured to transfer heat between the heating element and the inner surface of the casing, wherein at least a portion of the heat transfer fluid is undergoing phase changes between liquid and gas in order to regulate a temperature of the casing. Fins may be included on the outside of the casing to enhance heat transfer.