Downhole Fluid Analyzer Variable Optical Path Mirror
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Solution Overview
Problem
Current downhole fluid analysis tools lack the ability to efficiently vary optical path lengths for optimal measurement of downhole fluid properties, limiting the accuracy and range of fluid characterization in wellsite operations.
Innovation Solution
A downhole fluid analyzer equipped with an optical source, photodetector, and a positionable optical mirror that allows for varying optical path lengths by selectively passing or reflecting light through a flowline, enabling precise measurement of fluid properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed optical path length is used in downhole fluid analysis tools, then the device structure is simple, but the measurement accuracy and range of fluid characterization are limited
Solution Approach 1:
The patent implements a variable optical path length system where the optical path can be dynamically adjusted between different lengths (e.g., first optical path length and second optical path length). This allows the measurement system to adapt to different fluid properties and measurement requirements, thereby improving measurement accuracy without requiring multiple fixed-length devices. The dynamic adjustment capability resolves the contradiction by making the optical path length changeable rather than fixed.
2Adaptability or versatility
If multiple fixed optical path lengths are implemented, then measurement range is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of manufacturing multiple separate devices with different fixed optical path lengths, the patent employs a single device with a dynamically adjustable optical path. The optical path length can be changed by adjusting the position of optical components (such as mirrors or windows), allowing the system to achieve multiple measurement ranges from a single manufactured unit. This significantly reduces manufacturing complexity while maintaining measurement versatility.
Solution Approach 2:
The patent creates a universal fluid analysis device that can perform multiple measurement functions by varying the optical path length. A single device configuration can accommodate different measurement requirements (e.g., different fluid concentrations, different path length requirements) by adjusting the optical components, rather than requiring separate specialized devices for each measurement scenario. This multi-functionality approach improves adaptability while simplifying manufacturing.
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, accurate measurement of downhole fluid properties by optimizing optical path lengths, enhancing the characterization of hydrocarbon presence and composition, and improving formation evaluation processes.
Implementation Method 1
at least one optical source to pass a light through an optical window and through the downhole fluid in the flowline, at least one photodetector to measure the light passed through the downhole fluid in the flowline
Implementation Method 2
at least one optical mirror... An optical layer is provided on the optical mirror that selectively passes the light from the optical mirror to the at least one photodetector
Data Source
AI summary
A fluid analyzer of a downhole tool is provided. The downhole tool is positionable in a wellbore penetrating a subterranean formation. The wellbore has a downhole fluid thereabout. The downhole tool has a housing with a flowline therethrough for receiving the downhole fluid. The fluid analyzer includes at least one optical source to pass a light through an optical window and through the downhole fluid in the flowline, at least one photodetector to measure the light passed through the downhole fluid in the flowline, and at least one optical mirror. An optical path of the light extends from the optical source to the photodetector. An optical path length is defined as a length of a portion of the optical path within the flowline. The optical mirror is positionable about the flowline, and has an optical layer selectively passing the light from the optical mirror to the photodetector whereby the optical path length may be varied.