Optical Distributed Vibration Sensing for Downhole Cement Placement
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Solution Overview
Problem
Current methods for determining the location and properties of substances in wellbores, such as cement, gels, and fluids, are inadequate for real-time monitoring and accurate placement during operations like cementing, as they lack precision and comprehensive measurement capabilities.
Innovation Solution
The use of optical distributed vibration/acoustic sensing systems with optical waveguides and interrogators, combined with bluff bodies or structures that induce vibrations, allows for real-time detection of acoustic and vibrational signals to determine the displacement, location, and properties of substances by analyzing Brillouin, Rayleigh, and Raman backscatter, enabling precise monitoring of fluid flow and substance placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement methods are used to determine substance location in wellbores, then the measurement capability is limited, but the system complexity and cost are reduced
Solution Approach 1:
The patent replaces conventional mechanical measurement systems with optical sensing systems that use light propagation through optical waveguides to detect substance locations. The optical system uses Brillouin, Rayleigh, and Raman scattering effects to measure acoustic vibrations and determine substance positions, eliminating the need for complex mechanical sensors and their associated wiring and power requirements downhole.
Solution Approach 2:
The optical waveguide system serves multiple functions simultaneously: it acts as both the sensing element and the signal transmission medium, can detect multiple types of acoustic vibrations from different substances, and provides both location and velocity information. This multi-functionality reduces the need for multiple separate measurement systems.
2Manufacturing precision
If real-time monitoring of substance placement is implemented, then operational accuracy is improved, but the system complexity and data processing requirements increase
Solution Approach 1:
The optical waveguide system is self-powered by the laser source at the surface, requiring no downhole power supply. The system uses the wellbore environment itself (acoustic vibrations from flowing substances) as the measurement signal, eliminating the need for active downhole sensors or power consumption downhole. The system automatically provides real-time feedback as substances pass the waveguide.
Solution Approach 2:
The system provides continuous real-time feedback on substance locations by detecting acoustic vibrations as cement, spacers, and other materials pass the optical waveguide. This feedback enables operators to monitor and verify cement placement accuracy in real-time, ensuring proper annulus filling and identifying any placement issues immediately.
3Measurement precision
If optical distributed sensing systems are deployed, then measurement accuracy and real-time capability are improved, but the energy consumption and system complexity increase
Solution Approach 1:
The patent extracts the power consumption and complex electronics from the downhole environment to the surface location. Only the passive optical waveguide is deployed downhole, which requires no power. The active laser source and signal processing equipment are located at the surface, eliminating downhole energy consumption while maintaining measurement capabilities.
Solution Approach 2:
The system replaces active electronic sensors that would require downhole power with passive optical sensing that uses light propagation and acoustic vibration detection. The optical system leverages natural acoustic vibrations from fluid flow and substance movement, requiring no downhole power source while achieving precise measurement.
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 approach provides accurate, real-time monitoring of substance placement and properties, enhancing the precision and efficiency of well operations by utilizing optical sensing techniques to detect vibrations and acoustic signals, thereby improving the accuracy of substance location and flow measurements.
Implementation Method 1
analyzing Brillouin, Rayleigh, and Raman backscatter
Implementation Method 2
analyzing Brillouin, Rayleigh, and Raman backscatter
Implementation Method 3
analyzing Brillouin, Rayleigh, and Raman backscatter
Implementation Method 4
structures that induce vibrations, allows for real-time detection of acoustic and vibrational signals
Data Source
AI summary
A method of verifying a substance interface location during a cementing operation can include optically measuring vibrations caused by substances flowing across structures distributed along a wellbore, the vibrations being caused at each structure, and the vibrations changing at each structure as the interface displaces across the structure. A method of determining a property of at least one substance flowed in a wellbore can include optically measuring vibrations caused by the substance flowing across structures distributed along a wellbore, the vibrations being caused at each structure, and the structures having different shapes, thereby causing the vibrations at the structures to be different from each other when the substance flows across the differently shaped structures.