Distributed Fiber Optic Interferometer for Wellbore Acoustic Monitoring
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Solution Overview
Problem
Current methods for monitoring hydrocarbon reservoirs, wellbores, and pipelines are invasive, expensive, and provide sporadic, disjointed data, failing to offer continuous monitoring of multiple locations or long-term deployments, which is crucial for optimizing hydrocarbon production and managing processes like gravel packing and carbon dioxide sequestration.
Innovation Solution
A distributed fiber optic interferometer system that uses Coherent Rayleigh Noise (CRN) to acoustically monitor conditions in wellbores, reservoirs, and pipelines, allowing for simultaneous, continuous monitoring by detecting mechanical waves and changes in flow regimes, temperature, and pressure through the analysis of backscattered electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireline tools are deployed into the wellbore to obtain measurements, then measurement capability is improved, but production is interrupted and operational cost increases
Solution Approach 1:
The patent replaces mechanical wireline tools with an optical fiber-based distributed sensing system. The optical fiber acts as a continuous sensor along the wellbore, using optical backscatter techniques to detect acoustic events, temperature, and pressure without requiring physical intervention in the wellbore. This substitution eliminates production interruption while maintaining measurement capability.
Solution Approach 2:
The patent introduces optical fiber as an intermediary sensing element that can be deployed alongside the wellbore without interfering with hydrocarbon flow. The optical fiber serves as a mediator that captures environmental data (acoustic events, temperature, pressure) through optical backscatter effects, enabling continuous monitoring without direct mechanical interaction with the production stream.
2Loss of information
If wireline tools are used for monitoring, then data acquisition capability is improved, but operational cost and time consumption increase
Solution Approach 1:
The patent implements continuous monitoring through the distributed optical fiber system that remains permanently installed along the wellbore. Unlike periodic wireline tool deployments, the optical fiber system continuously captures acoustic events, temperature changes, and pressure variations in real-time, eliminating repeated operational interventions and associated time losses.
Solution Approach 2:
The patent performs preliminary deployment of the optical fiber system during wellbore construction or initial setup. Once installed, the system requires no further deployment actions and automatically begins continuous monitoring, eliminating the need for repeated tool transportation, deployment, and retrieval operations that consume operational time.
3Measurement precision
If invasive wireline tools are deployed, then monitoring capability is improved, but wellbore architecture access is limited and production is affected
Solution Approach 1:
The patent replaces mechanical wireline tools with an optical fiber-based system that can be routed externally alongside the wellbore or through existing infrastructure. This substitution allows the sensing system to access complex wellbore architectures (multiple laterals, horizontal sections, cased holes) without requiring physical intervention that would be constrained by valves, packers, or pumps.
Solution Approach 2:
The patent creates a universal monitoring system using optical fiber that can be deployed across diverse wellbore architectures and application scenarios. The distributed sensing capability provides multi-functional monitoring (acoustic events, temperature, pressure, flow detection) in a single system that adapts to various well configurations without requiring architecture-specific tool modifications.
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 real-time monitoring of hydrocarbon production, sand presence, gravel packing processes, and carbon dioxide storage, improving the efficiency of hydrocarbon extraction and reducing operational costs by providing continuous, accurate data without the need for invasive wireline tools.
Implementation Method 1
coherent Rayleigh noise ('CRN') in a fiber optic sensor and processing the developed CRN in the fiber optic sensor to provide for monitoring a wellbore, reservoir or conduit
Implementation Method 2
the fiber optic sensor is configured to act as an interferometer, the fiber optic sensor is sensitive enough to detect mechanical waves originating from acoustic occurrences/events
Data Source
AI summary
A method and system for acoustic monitoring using a fiber optic cable. The optical fiber is used as a distributed interferometer that may be used to monitor activity, such as activity with respect to a conduit, wellbore or reservoir. The distributed interferometric monitoring provides for accurate detection of acoustic occurrences along the fiber optic cable and these acoustic occurrences may include fluid flow in a pipeline or wellbore, processes taking place in a wellbore or pipeline, fracturing, gravel packing, production logging and/or the like.