Optical Bridge Sensor Structure for Multiphase Downhole Fluid Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optical measurements in well sampling are hindered by multiphase flows and particulates, leading to unreliable results, particularly in water sampling.
Innovation Solution
A bridge design in an optical sensor with a substrate containing a contrast agent, mechanically supported, that allows fluid flow while channeling optical energy, mitigating multiphase and particulate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical measurements are performed on fluid samples in multiphase flows, then measurement capability is provided, but measurement reliability deteriorates due to interference from oil, water, gas, particles, and light fluctuations
Solution Approach 1:
The flow path is segmented into distinct zones: a first flow path section for oil phase and a second flow path section for water phase. This segmentation allows separate optical measurement zones, enabling reliable measurement of each phase independently without mutual interference from multiphase mixing, particles, and light fluctuations.
Solution Approach 2:
A bridge structure with contrast agents acts as an intermediary element between the light source and detector. The contrast agents (such as metal porphyrins) selectively interact with specific fluid phases to enhance optical signals, while the bridge physically separates measurement zones. This intermediary mechanism mitigates harmful effects of multiphase interference and improves measurement reliability.
2Measurement precision
If water sampling is performed in multiphase environments, then water detection capability is provided, but measurement accuracy deteriorates due to oil and gas interference
Solution Approach 1:
Different sections of the flow path are designed with distinct optical properties and contrast agent concentrations optimized for specific fluid phases. The first flow path section uses optical parameters optimized for oil phase detection, while the second section uses parameters optimized for water phase detection. This local quality differentiation enables accurate water detection in the second section without interference from oil and gas present in other sections.
Solution Approach 2:
The bridge structure with phase-selective contrast agents serves as an intermediary that enhances water phase optical signals while being transparent or non-interfering to oil and gas phases. This selective interaction improves water detection accuracy by amplifying water-specific optical signals and filtering out interference from other phases.
3Productivity
If rapid chemical equilibrium is achieved in the flow path, then measurement speed is improved, but device complexity increases due to bridge structure requirements
Solution Approach 1:
The bridge structure incorporates porous materials that allow rapid fluid penetration and equilibration. The porous architecture provides large surface area for contrast agent-fluid interaction while maintaining short diffusion paths, enabling rapid chemical equilibrium to be achieved. This accelerates measurement speed without requiring excessively complex external pumping or mixing systems.
Solution Approach 2:
The bridge structure combines multiple functions into a single integrated component: it serves as a physical separator between flow path sections, a mounting structure for contrast agents, an optical element for signal enhancement, and a flow distribution mechanism. By merging these functions, the device achieves rapid equilibrium and reliable measurements without proportionally increasing overall system complexity.
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
Enhances the reliability and accuracy of optical measurements by facilitating rapid chemical equilibrium and improving detection of fluid components, even in challenging downhole conditions.
Implementation Method 1
A bridge design in an optical sensor with a substrate containing a contrast agent, mechanically supported, that allows fluid flow while channeling optical energy
Data Source
AI summary
A downhole fluid sampling tool may include an optical measurement tool and a viewing region disposed in the optical measurement tool. In examples, a bridge may be disposed in a transparent portion of the flow path between a light source and a light modifier and an optical detector. The bridge includes a structure comprising a substrate and a contrast agent, wherein the contrast agent is any molecule configured to interact with an analyte and alter a property of the analyte and/or contrast agent, wherein the property is detectable by the optical measurement tool.