Thermal Anomaly Detection for Passive Ranging to Target Wellbores
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Solution Overview
Problem
Current methods for ranging a relief wellbore to a target wellbore are ineffective in locating undesired and uncontrolled influxes, especially when the target wellbore is cased, as they rely on detecting ferromagnetic materials, which are not applicable in such scenarios.
Innovation Solution
The use of a thermal anomaly detection system involving a temperature sensor and distributed temperature sensing technology to identify deviations from the geothermal gradient, allowing for the determination of the influx location by measuring temperature changes in the formation surrounding the target wellbore, which can be caused by various heat transfer mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ferromagnetic material detection methods are used for ranging, then the method is simple and cost-effective, but it becomes ineffective when the target wellbore is cased or when ferromagnetic materials are not present
Solution Approach 1:
The patent replaces ferromagnetic detection methods with thermal anomaly detection. Instead of detecting ferromagnetic materials using magnetic field sensors, the system uses temperature sensors to detect thermal anomalies in the formation, substituting a mechanical/magnetic detection system with a thermal detection system that works regardless of wellbore casing or material composition
Solution Approach 2:
The patent changes the detection parameter from magnetic properties to thermal properties. By measuring temperature deviations from the geothermal gradient rather than ferromagnetic material presence, the system adapts to different wellbore configurations and formation conditions, resolving the limitation of ferromagnetic-based methods
2Measurement precision
If thermal anomaly detection is used to locate influxes, then ranging precision is improved, but device complexity increases due to temperature sensing systems
Solution Approach 1:
The system uses the natural thermal field of the earth formation itself as the detection medium. Instead of requiring complex active sensing systems, the patent leverages the existing geothermal gradient and thermal anomalies caused by influxes, allowing the formation to essentially detect itself through temperature measurements
Solution Approach 2:
The patent introduces temperature as an intermediary parameter to locate influxes. Rather than directly detecting the influx or using complex imaging systems, the system uses temperature deviations in the formation as an indirect indicator, simplifying the detection approach while maintaining precision
3Adaptability or versatility
If distributed temperature sensing is implemented, then detection capability for cased wellbores is enabled, but energy consumption increases
Solution Approach 1:
The distributed temperature sensing system can operate using periodic or intermittent measurements rather than continuous monitoring. By taking temperature readings at specific intervals or when anomalies are detected, the system maintains adaptability to cased wellbores while reducing overall energy consumption compared to continuous operation
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 enables accurate localization of influxes in both cased and uncased target wellbores, facilitating controlled fluid communication between relief and target wellbores by detecting temperature anomalies, thereby improving the precision of ranging and influx management.
Implementation Method 1
detecting temperature anomalies, thereby improving the precision of ranging and influx management... identifying deviations from the geothermal gradient
Implementation Method 2
measuring temperature changes in the formation surrounding the target wellbore, which can be caused by various heat transfer mechanisms
Data Source
AI summary
A method can include measuring temperature along a relief wellbore, thereby detecting a temperature anomaly in an earth formation penetrated by the relief wellbore, and determining a location of an influx into a target wellbore, based on the temperature anomaly detecting. A thermal anomaly ranging system for use with a subterranean well can include a temperature sensor in a relief wellbore that penetrates an earth formation, the temperature sensor detecting a temperature anomaly in the formation, and the temperature anomaly being caused by an influx into a target wellbore. Another method can include measuring optical scattering in an optical waveguide positioned in a relief wellbore, thereby detecting a temperature anomaly in an earth formation penetrated by the relief wellbore, and determining a location of an influx into a target wellbore, based on the temperature anomaly detecting.