Wellhead Tracer Monitoring with Solar-Powered Radiation Detection
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Solution Overview
Problem
Current systems for detecting gamma radiation from tracers in oil wells are intrusive, non-intrusive, have limited battery life, lack data storage capacity, operate within a narrow temperature range, and require constant operator presence, making them unsuitable for continuous, autonomous monitoring.
Innovation Solution
A system comprising a radiation detector with a scintillation crystal and photomultiplier tube, powered by a solar panel and batteries, connected to data acquisition equipment that allows for continuous monitoring of tracer activity at the wellhead, capable of differentiating multiple tracers and operating autonomously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sampling tests are performed with high frequency immediately after tracer injection, then the tracer response can be accurately captured, but the cost of the sampling test rises sharply due to the large amount of sampling tests required
Solution Approach 1:
The patent replaces the mechanical sampling system with a radiation detection system. Instead of physically collecting fluid samples through wells and transporting them to laboratories, the system uses gamma radiation detectors to measure tracer concentration remotely at the wellhead. This substitution eliminates the need for frequent physical sampling while maintaining accurate tracer response measurement, directly resolving the contradiction between measurement precision and the quantity of sampling required.
2Ease of operation
If commercial laptops with battery power are used for radiation detection, then portability is achieved, but the battery life is limited to 3-10 hours which does not allow permanent connection to wells
Solution Approach 1:
The patent changes the power supply parameters from limited battery power to unlimited solar power. By equipping the detection system with solar panels and rechargeable batteries, the system achieves both portability (maintaining the mobile detection capability) and extended duration (solar recharging enables continuous operation for days or weeks). This parameter change in the energy supply system resolves the contradiction between ease of operation and duration of action.
3Measurement precision
If detectors are used to measure gamma radiation from tracers, then field detection becomes feasible, but the system requires constant operator presence and cannot operate autonomously
Solution Approach 1:
The patent implements self-service automation through a microcontroller that autonomously controls the detection system. The microcontroller automatically activates the radiation detector, acquires measurement data, processes the signals, and stores results in memory based on pre-programmed sampling schedules. This eliminates the requirement for constant operator presence while maintaining accurate gamma radiation detection, resolving the contradiction between measurement precision and extent of automation.
4Adaptability or versatility
If multiple tracers are differentiated using energy discrimination, then comprehensive reservoir monitoring is achieved, but the device complexity increases
Solution Approach 1:
The patent replaces complex hardware-based multi-tracer differentiation systems with software-based energy discrimination using a histogram analyzer. The system measures the energy spectrum of gamma radiation and uses software algorithms to distinguish between different tracer isotopes based on their characteristic energy signatures. This software substitution reduces physical device complexity while maintaining the ability to differentiate multiple tracers, resolving the contradiction between adaptability and device complexity.
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
Enables precise, continuous monitoring of tracer concentration, reducing uncertainty and analysis costs by eliminating the need for frequent sampling and laboratory analysis, while operating under extreme conditions.
Implementation Method 1
a radiation detector with a scintillation crystal and photomultiplier tube
Implementation Method 2
a radiation detector with a scintillation crystal and photomultiplier tube
Implementation Method 3
powered by a solar panel and batteries
Data Source
AI summary
The online measurement system of radioactive tracers in oil wells head, object of this invention, is characterized by the use of new technology to measure concentrations of tracer activity in real time, using a radiation detector NaI (TI), with features that make it possible to detect up to three different tracers and be able to operate in temperature conditions up to 150° C., which allows to be immersed in a container with fluid coming from the flow stream, achieving with this to increase the sensitivity of the measurements. This system of measurement in the head of production wells will allow having much more data of the tracer activity, avoiding having to transport the operational staff to production wells to carry out sampling test, with all the advantages that this represents.