Location-Dependent Calibration for Distributed Temperature Sensors
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Solution Overview
Problem
Distributed temperature sensing systems face challenges in making accurate calibrated temperature measurements due to non-linear spectral attenuation, leading to unreliable temperature data with significant inaccuracies such as spikes and inconsistencies along the fiber length.
Innovation Solution
A method and system for calibrating DTS systems by receiving temperature data along an optical fiber, calculating unique calibration coefficients for each location, and applying them to correct the data, using a DTS unit with a receiver and processor to generate and process temperature-dependent signals, and employing insulated stability chambers to simulate various temperatures for data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior art calibration procedures are used, then the calibration process is simple, but the temperature measurement precision deteriorates due to spikes and inconsistencies
Solution Approach 1:
The patent divides the fiber length into multiple discrete locations (e.g., 1000 locations at 1-meter intervals) and calculates a unique set of calibration coefficients for each location. This segmentation approach transforms the single averaged calibration into location-specific calibrations, eliminating the temperature spikes and inconsistencies that occur with uniform calibration methods.
Solution Approach 2:
The patent implements location-dependent calibration by determining unique calibration coefficients specific to each sensing location along the fiber. This local quality approach ensures that each location is calibrated according to its specific spectral attenuation characteristics, improving temperature measurement precision without requiring complex dual-ended configurations.
2Measurement precision
If dual-ended configuration is used, then the spectral attenuation correction improves, but the device complexity and installation difficulty increase
Solution Approach 1:
The patent extracts the spectral attenuation correction capability from the complex dual-ended configuration requirement and implements it through location-specific calibration coefficients. By removing the need for dual-ended interrogation while maintaining spectral attenuation correction, the system achieves improved measurement precision with simpler device configuration.
Solution Approach 2:
The patent introduces location-specific calibration coefficients as an intermediary that mediates between the raw temperature data and the corrected temperature measurements. These coefficients account for spectral attenuation effects at each location without requiring dual-ended configuration, thereby simplifying the overall system while maintaining correction accuracy.
3Reliability
If averaged calibration is applied, then the calibration process is straightforward, but the reliability of temperature data deteriorates due to spikes and gradients
Solution Approach 1:
The patent segments the fiber into multiple discrete sensing locations and applies unique calibration coefficients to each location rather than using a single averaged calibration value. This segmentation eliminates the temperature spikes and artificial gradients that occur with averaged calibration, significantly improving the reliability of temperature data along the entire fiber length.
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
This approach results in significantly more accurate calibrated temperature data by accounting for location-dependent variations, reducing inaccuracies and providing precise temperature measurements along the fiber length.
Implementation Method 1
distributed temperature sensing systems (DTS)
Data Source
AI summary
A method for calibrating distributed temperature sensing (DTS) systems is disclosed. The method includes: receiving temperature data associated with one or more locations along a length of an optical fiber; calculating a set of unique calibration coefficients specific to each of the one or more locations along the fiber length; and applying the set of calibration coefficients specific to each of the one or more locations along the fiber length to the temperature data for calibrated correction thereof. Also disclosed is a system for calibrating DTS data and a wellbore for providing calibrated DTS data.