Fiber Optic Magnetic Induction Sensor for Downhole Monitoring
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Solution Overview
Problem
Current magnetic induction sensing technologies in oil fields are limited by high power consumption and inability to detect lower magnetic induction levels, making them less effective for offshore and subsurface reservoir monitoring, particularly in environments with limited power and for applications like water-flooding and gas flooding.
Innovation Solution
The development of optical-fiber based magnetic induction sensors that measure the magnetic induction (B-field) directly, rather than induced electromotive force (dB/dt), with no active power consumption components, integrated into a fiber optic sensing cable around a well casing, enabling the detection of lower minimum magnetic induction levels and suitable for permanent downhole EM reservoir monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional magnetic induction sensing technologies are used, then power consumption is high, but detection sensitivity to lower magnetic induction levels deteriorates
Solution Approach 1:
The patent replaces conventional electronic sensing components with fiber optic-based magnetic induction sensors that use optical fields instead of electrical fields. The fiber optic sensor includes a magnetic induction coil coupled to an electro-optical transducer, converting magnetic field changes into optical signal changes, thereby eliminating the need for active power consumption components while improving detection sensitivity to lower magnetic induction levels
Solution Approach 2:
The patent changes the operating parameters by measuring magnetic induction (B-field) directly rather than induced electromotive force (dB/dt). This parameter change enables the sensor to detect lower minimum magnetic induction levels with no active power consumption, as the optical fiber system responds directly to magnetic field strength without requiring powered amplification or signal conditioning circuits
2Device complexity
If conventional sensing systems are deployed, then power availability is not constrained, but device complexity increases
Solution Approach 1:
The patent replaces complex electronic sensing systems with a fiber optic-based system that uses passive optical components. The fiber optic cable integrates the magnetic induction coil and electro-optical transducer, eliminating the need for separate powered electronics, signal conditioning circuits, and data processing units downhole, thereby reducing device complexity while being suitable for power-constrained environments
Solution Approach 2:
The fiber optic sensing cable serves multiple functions: it acts as both the communication medium and the sensing element. The optical fiber cable integrates the magnetic induction coil coupling and electro-optical transduction, combining sensing, signal transmission, and data communication into a single passive system that requires no separate powered components
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 solution provides efficient and reliable monitoring of fluid movement and resistivity profiles in reservoirs, enabling effective tracking of flood fronts and optimizing hydrocarbon production, even in power-constrained offshore environments, with improved sensitivity and reduced power requirements.
Implementation Method 1
an induction coil for measuring a magnetic induction and for providing an output electrical signal representative of at least one component of the magnetic induction
Implementation Method 2
an electro-optical transducer for converting the electrical signal into an optical signal
Data Source
AI summary
A sensing system includes a magnetic induction sensor. The magnetic induction sensor includes an induction coil for measuring a magnetic induction and for providing an output electrical signal representative of at least one component of the magnetic induction. The magnetic induction sensor further includes an electro-optical transducer for converting the electrical signal into an optical signal. The magnetic induction sensor also includes at least one impedance matching circuit electrically connected with an output of the induction coil and electrically connected with an input of the electro-optical transducer. The sensing system further includes at least one fiber optic sensing cable coupled to the magnetic induction sensor that optically communicates optical signals from the magnetic induction sensor.