Optical Fiber Sensor Array for Subterranean Pressure Monitoring
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Solution Overview
Problem
The extraction of heavy oil from tar sands is challenging due to limited data points available for operational parameter optimization in subterranean reservoirs, making it difficult to efficiently recover oil using methods like Steam Assisted Gravity Drainage (SAGD).
Innovation Solution
A sensor array system is deployed in subterranean formations to measure temperature and pressure at multiple locations using optical fibers and deformable components, providing detailed data for better understanding and control of extraction processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional data collection methods are used in subterranean reservoirs, then the system complexity is low, but the measurement precision and quantity of data points are insufficient for operational optimization
Solution Approach 1:
The sensor array is divided into multiple discrete sensor units distributed at different locations within the subterranean formation. Each sensor unit independently measures local temperature and pressure, providing spatially-resolved data points that enhance measurement precision without requiring a single complex centralized system
Solution Approach 2:
The sensor array system performs multiple functions simultaneously: it measures temperature, measures pressure, provides spatial distribution of parameters, and enables operational optimization. This multi-functionality justifies the increased device complexity by delivering comprehensive data for reservoir management
2Quantity of substance
If multiple sensors are deployed at spaced locations, then the quantity of data points improves, but the device complexity and installation difficulty increase
Solution Approach 1:
Multiple sensor units are nested within a hierarchical structure where individual sensors are contained within sensor assemblies, which are in turn distributed within the subterranean formation. This nested organization allows for scalable deployment of multiple data points while managing system complexity through modular architecture
Solution Approach 2:
The sensor array transitions from single-point measurements to multi-dimensional spatial mapping by distributing sensors across different locations, depths, and orientations within the subterranean formation. This dimensional expansion provides comprehensive data coverage without proportionally increasing operational complexity
3Reliability
If optical fibers are used to link sensors, then the reliability of data transmission improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The system replaces traditional electrical wiring and signal transmission mechanisms with optical fiber technology. Optical fibers provide immune-to-electromagnetic-interference data transmission, enhancing reliability in the harsh subterranean environment, though they require specialized handling and splicing procedures that increase manufacturing complexity
Solution Approach 2:
Optical fibers serve as intermediary elements that transmit measurement data from distributed sensor units to surface equipment. These fibers act as reliable communication channels through the subterranean environment, isolating the sensing elements from direct electrical connections while maintaining data integrity
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 enhances the ability to monitor and optimize heavy oil extraction by providing precise temperature and pressure measurements, improving the efficiency and effectiveness of SAGD processes and other extraction methods.
Implementation Method 1
An optical path, such as an optical fiber links the first and the second sensors. The optical path transporting measurements generated by the first sensor and by the second sensor conveying
Implementation Method 2
a deformable component which undergoes deformation in response to a pressure differential established across the deformable component
Data Source
AI summary
A sensor arrangement using an optical fiber and methodologies for performing an analysis of a subterranean formation, such as a subterranean formation containing a hydrocarbon based fluid. The sensor arrangement may be used to measure one or more physical parameters, such as temperature and/or pressure, at a multiplicity of locations in the subterranean reservoir. The sensor arrangement may comprise a sensor array comprising an elongated outer casing for insertion in the subterranean formation and into a fluid in the subterranean formation. The sensor array may comprise an optical fiber defining an optical path that links one or more temperature sensors and one or more pressure sensors and transports measurement data generated by the temperature and pressure sensors. A data processing system may be connected to the sensor array to receive measurements from the sensor array and to compute one or more values of a property of an extraction installation operating on the subterranean formation.