Monitor Borehole Layout for Hazardous Waste Casing Distortion Detection
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Solution Overview
Problem
Safe and retrievable storage of hazardous waste, particularly nuclear waste, in deep drillholes is challenging due to issues with containment and potential leakage, which conventional methods like tunnels and boreholes fail to adequately address.
Innovation Solution
A hazardous waste repository system with a directional drillhole and casing, incorporating a monitor borehole and measurement instruments to detect casing distortion, allowing for early warning of potential leakage and enabling retrieval before it becomes impossible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional borehole storage methods are used, then storage capacity is achieved, but the ability to detect containment failure and retrieve waste is lost
Solution Approach 1:
The patent implements monitoring instruments and distortion detection systems before waste emplacement, establishing the ability to detect containment issues before they lead to leakage. This preliminary monitoring infrastructure enables early warning and retrieval capability while maintaining storage reliability.
Solution Approach 2:
The patent employs feedback mechanisms through distortion monitoring instruments that continuously assess casing integrity. When distortion exceeds thresholds indicating potential failure, the system provides feedback signals to trigger retrieval operations, creating a closed-loop containment assurance system.
2Reliability
If deep drillholes are used for storage, then storage safety is improved, but the ability to retrieve waste is compromised due to potential casing distortion
Solution Approach 1:
The system establishes monitoring instruments and distortion thresholds before waste emplacement, enabling early detection of casing distortion that would prevent future retrieval. This allows retrieval operations to be initiated while the drillhole is still accessible.
Solution Approach 2:
The patent replaces direct mechanical access requirements with remote distortion monitoring and sensing systems. Instead of requiring physical access for routine inspection, the system uses acoustic, electromagnetic, or optical sensors to detect casing integrity issues remotely, maintaining retrieval capability without compromising storage safety.
3Reliability
If monitoring instruments are installed in the storage region, then early detection of leakage is enabled, but device complexity and cost increase
Solution Approach 1:
The patent employs multi-functional monitoring instruments that can detect multiple parameters (distortion, temperature, radiation, fluid presence) using single integrated platforms. This reduces the number of separate instruments needed while maintaining comprehensive leakage detection capability.
Solution Approach 2:
The system uses intermediary distortion monitoring as a proxy for direct leakage detection. By monitoring casing distortion that precedes leakage, the system indirectly detects potential failure modes without requiring instruments in direct contact with hazardous waste, reducing instrumentation complexity and safety risks.
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
Ensures long-term, safe storage with the ability to retrieve waste if needed, by providing early detection of casing deformation and leakage risks, thus reducing the risk of environmental contamination.
Implementation Method 1
an acoustic probe configured to record seismic waves scattered off the casing to detect the distortion of the casing
Implementation Method 2
the measurement instrument includes one or more calipers configured to measure a distortion of the monitor borehole to detect the distortion of the casing
Data Source
AI summary
A hazardous waste repository includes a directional drillhole formed from a terranean surface into at least one subterranean formation suitable for storing hazardous waste. The directional drillhole includes a storage region configured to store one or more hazardous waste canisters that is configured to enclose hazardous waste. The repository further includes a casing that extends to at or near the terranean surface, through the directional drillhole, and into the storage region of the substantially horizontal drillhole portion. The repository further includes a monitor borehole formed from the terranean surface into the at least one subterranean formation adjacent the storage region. The monitor borehole is sized to receive a measurement instrument run from the terranean surface to a portion of the monitor borehole adjacent the storage region. The measurement instrument is configured to detect a distortion of the casing.