Distributed Magnetomotive Force Sensor for Fluid Front Tracking
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Solution Overview
Problem
Oil field operators face challenges in controlling the flooding process due to inhomogeneity in subsurface formations, leading to undesirable breakthrough of the flood fluid and reduced hydrocarbon recovery, as existing methods lack detailed information on stimulation processes and fluid flows.
Innovation Solution
A distributed magnetomotive force (MMF) sensing system using fiber-optic cables with integrated MMF sensors around well casings to track the fluid front by measuring resistivity distribution, enabling optimization of hydrocarbon recovery through real-time monitoring and control of production parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional flooding processes are used to recover hydrocarbons, then fluid flow through the reservoir is achieved, but inhomogeneity in subsurface formations causes premature breakthrough of flood fluid and reduces recovery efficiency
Solution Approach 1:
The system implements real-time feedback by continuously monitoring resistivity distribution along the flood path using distributed MMF sensors. This allows operators to detect the actual position of the flood front and adjust injection parameters dynamically, transforming the open-loop flooding process into a closed-loop controlled system that adapts to formation inhomogeneity.
Solution Approach 2:
The patent replaces conventional electrical resistivity measurement systems with a magnetomotive force-based sensing system. The MMF sensors generate magnetic fields that interact with the resistivity distribution to produce measurable signals, enabling non-intrusive monitoring without the complexity of traditional electrical injection and measurement systems.
2Measurement precision
If detailed monitoring of fluid front position is implemented, then breakthrough can be detected early, but the complexity of the monitoring system increases
Solution Approach 1:
The MMF sensing system serves multiple functions simultaneously: it measures resistivity distribution, detects fluid front position, monitors formation properties, and provides spatially distributed data along the entire flood path. This multi-functionality reduces the need for separate monitoring systems and decreases overall system complexity despite high measurement precision.
Solution Approach 2:
The system uses magnetic field interaction as an intermediary mechanism to indirectly measure resistivity distribution and fluid front position. Rather than directly measuring fluid properties or injecting tracers, the MMF sensors use magnetic fields to probe the formation, providing precise measurement information through a non-intrusive intermediary process.
3Productivity
If real-time monitoring of resistivity distribution is performed, then production parameters can be optimized, but the cost and complexity of the sensing system increases
Solution Approach 1:
The MMF sensing system is designed to be self-contained and autonomous, with sensors distributed along the wellbore that independently measure local resistivity conditions. The system processes its own data to provide real-time feedback without requiring complex external processing equipment, enabling production optimization through a relatively simple integrated system.
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
The system allows for precise tracking of the fluid front and optimization of hydrocarbon recovery by providing detailed information on reservoir conditions, reducing the risk of fluid breakthrough and enhancing production efficiency.
Implementation Method 1
A distributed magnetomotive force (MMF) sensor, positioned in an annular space around a well casing, produces signals that are a function of external magnetic fields
Implementation Method 2
The sensor measurements in response to an injected current or another electromagnetic field source can be used to determine a resistivity distribution around the well
Implementation Method 3
The distributed MMF sensor is coupled to a surface interface via a fiber-optic cable
Implementation Method 4
An electromagnetic source or another current distribution in the formation generates a magnetic field
Data Source
AI summary
A formation monitoring system includes a casing that defines an annular space within a borehole. A distributed magnetomotive force sensor is positioned in the annular space and configured to communicate with the surface via a fiber-optic cable. A computer coupled to the fiber-optic cable receives measurements and responsively derives the location of any fluid fronts in the vicinity such as an approaching flood front to enable corrective action before breakthrough. A formation monitoring method includes: injecting a first fluid into a reservoir formation; producing a second fluid from the reservoir formation via a casing in a borehole; collecting magnetic field measurements with a distributed magnetomotive force sensor in an annular space between the casing and the borehole, communicating measurements to a surface interface via one or more fiber-optic cables; and operating on the measurements to locate a front between the first and second fluids.