Optical Fluid Analyzer with Rotating Filter Wheel
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Solution Overview
Problem
Existing optical analyzers in harsh environments, such as the oil and gas industry, face limitations in providing comprehensive in-situ, real-time fluid characterization due to limited spectral resolution and channel count, which hinders the ability to distinguish between different fluids of the same type and determine reservoir connectivity.
Innovation Solution
An optical fluid analyzer (OFA) system with an electromagnetic source generating a broad spectrum of wavelengths, a source splitter creating parallel reference and measurement channels, and adjustable filter assemblies for precise filtering, along with a detection unit for real-time fluid analysis, enabling detailed fluid characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior art spectrometers use a limited number of channels (8-20) with fixed filters, then the device complexity is reduced and space requirements are minimized, but the spectral resolution is insufficient to distinguish between different fluids of the same type
Solution Approach 1:
The patent implements a dynamic filter wheel mechanism that rotates to position different filters in the optical path. This allows the system to sequentially access multiple wavelength channels (up to 70 channels in the near-infrared region) without requiring all filters to be present in the optical path simultaneously, thereby achieving high spectral resolution while controlling device complexity.
Solution Approach 2:
The patent adds a temporal dimension to the measurement process by using a rotating filter wheel. Instead of having all channels available simultaneously in space, the system provides high spectral resolution through time-multiplexed measurements, allowing comprehensive fluid characterization without proportionally increasing spatial complexity.
2Loss of information
If prior art spectrometers use 8-20 fixed channels, then the device is simpler and requires less space, but it cannot provide continuous spectrum or fingerprinting information for reservoir connectivity determination
Solution Approach 1:
The rotating filter wheel dynamically configures the spectrometer to provide either discrete channel measurements or continuous spectral information depending on the measurement requirements. This dynamic reconfigurability enables comprehensive fluid fingerprinting and reservoir connectivity determination without permanently complexifying the device architecture.
3Measurement precision
If the spectrometer provides high spectral resolution with many channels, then fluid characterization capability is improved, but the size and space requirements increase
Solution Approach 1:
The patent nests multiple filters within a rotating wheel structure, allowing many filters (70 channels in NIR region) to be compactly housed in a relatively small volume. The filters are arranged radially around the rotation axis, enabling high channel count without proportionally increasing the instrument's footprint.
Solution Approach 2:
By using a rotating filter wheel, the system provides high spectral resolution through time-multiplexed measurements rather than requiring all channels to be simultaneously accessible. This dynamic approach achieves comprehensive fluid characterization in a compact configuration suitable for downhole environments.
4Reliability
If prior art optical analyzers are designed for controlled laboratory environments, then device complexity is minimized, but they cannot operate in harsh downhole environments with high temperature and pressure
Solution Approach 1:
The patent employs sapphire windows as protective barriers between the optical components and the harsh downhole environment. Sapphire provides excellent mechanical strength, thermal stability, and optical transparency, allowing the spectrometer to operate reliably at high temperatures and pressures while protecting sensitive electronic and optical components.
Solution Approach 2:
The instrument is segmented into distinct functional modules: a harsh-environment-resistant optical measurement section with sapphire windows, and a protected electronics section. This modular segmentation allows the optical components to withstand downhole conditions while electronics operate in a controlled environment, reducing overall system complexity compared to making all components harsh-environment resistant.
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 OFA system provides enhanced spectral resolution and real-time fluid characterization, allowing for accurate identification of fluid types and reservoir connectivity, improving the ability to determine reservoir properties and optimize production.
Implementation Method 1
a broadband light source, which can include wavelengths from the ultraviolet range (100-400 nm), the visible light range (400 nm to 800 nm) and the near infrared range (up to 2200 nm)
Implementation Method 2
Fluids within the flow absorb light based on two phenomena: electronic absorption at shorter wavelengths and molecular absorption at longer wavelengths
Implementation Method 3
Fluids within the flow absorb light based on two phenomena: electronic absorption at shorter wavelengths and molecular absorption at longer wavelengths
Implementation Method 4
Absorption spectrometers of the prior art use detectors, or detector and filter pairs, which are selected based on a particular wavelength of interest and they measure the amount of light that the fluid within the flow line absorbs at the preselected wavelengths
Data Source
AI summary
Apparatus and methods for performing optical analyses in a harsh environment are disclosed. Some of the systems and methods of the present disclosure include fluorescence, absorption, and reflectance detection using a drum spectrometer. Other systems and methods of the present disclosure include a measurement channel and a parallel reference channel concurrently filtering optical signals.