Through-Casing Fiber Optic Magnetic Induction Sensor for Formation Monitoring
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Solution Overview
Problem
Current hydrocarbon recovery operations face challenges in monitoring formation changes and fluid saturations near wellbores without disrupting ongoing production, especially in mature fields where equipment accessibility and maintenance costs are high.
Innovation Solution
A through-casing electromagnetic formation monitoring system using magnetic induction sensors deployed inside the casing string, which measures magnetic induction and fields, communicating data via fiber optic cables to an optical interrogation system for real-time analysis of formation properties like resistivity and fluid saturations, allowing continuous monitoring without interfering with well operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic induction sensors are deployed inside the casing string for formation monitoring, then continuous monitoring without disrupting production is achieved, but equipment accessibility and maintenance costs increase
Solution Approach 1:
The magnetic induction sensors are nested inside the existing casing string of the wellbore, allowing the monitoring system to be deployed within the confined space of the casing. This nesting approach enables continuous formation monitoring while maintaining well production operations, as the sensors are positioned internally without requiring external well interventions.
2Loss of information
If through-casing electromagnetic monitoring is implemented, then real-time formation data is obtained, but system complexity and deployment difficulty increase
Solution Approach 1:
The magnetic induction sensors serve multiple functions: they measure formation resistivity, detect fluid saturations, and monitor formation changes over time. By using a single sensor type for multiple measurement purposes, the system reduces overall complexity while achieving comprehensive formation characterization without requiring multiple specialized devices.
Solution Approach 2:
The casing string acts as an intermediary medium that allows magnetic induction sensors to access formation properties without direct contact with the formation. The sensors measure electromagnetic fields that penetrate through the casing wall, enabling formation monitoring while the casing provides mechanical protection and a stable mounting structure for the sensors.
3Ease of operation
If sensors are placed inside the casing string, then non-intrusive monitoring is achieved, but measurement precision through casing may be reduced
Solution Approach 1:
The system utilizes electromagnetic field parameters that can penetrate through the casing material. By selecting appropriate frequencies and field strengths for magnetic induction, the sensors can obtain formation measurements through the casing wall while maintaining adequate precision. The electromagnetic parameters are optimized to balance penetration capability through the casing with measurement accuracy of formation properties.
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 long-term, cost-effective, and non-intrusive monitoring of formation properties, optimizing production and reservoir management by providing real-time data on fluid saturations and changes, such as water flooding, without requiring costly well interventions.
Implementation Method 1
The sensors measure magnetic induction, magnetic fields, or other properties along various points of the casing string
Data Source
AI summary
A through-casing formation monitoring system may include a casing string positioned within a wellbore, a power source electrically coupled to a first transmitter configured to produce a magnetic field, a magnetic induction sensor positioned within the casing string such that the magnetic induction sensor allows a continued operation of the wellbore, a fiber optic cable coupled to an electro-optical transducer within the magnetic induction sensor, and an optical interrogation system configured to receive measurements from the magnetic induction sensor via the fiber optic cable.